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					                                                            Sensors
Industrial Automation
Catalog Section - U906




              Analog Distance Sensors

                 SA1D




              For up-to-date information, or to request a
              full copy of this catalog, contact us at
              www.idec.com or 800-262-IDEC..

              Due to continuous product improvements,
              specifications are subject to change
              wihtout notice.
                  Sensors                                                                                                  Selection Guide

 Sensor Type       Series    Page    Appearance         Advantages                                     Considerations
                                                        • Ultrasonic sensing (using sound waves)
                                                          is perfect for sensing applications which
                                                          cannot be accomplished through the use       • Adjustments for tolerating wave interfer-
                                                          of light, such as when detecting trans-        ence are not selected simultaneously.
 Ultrasonic                                               parent items, films, and liquid levels.         One mode is selected when encounter-
                                                        • Ultrasonic sensing is normally disrupted
 Analog            SA6A      M-60                         by wave interference, but the SA6A fea-        ing surface turbulence (liquid level
 Sensors                                                                                                 sensing) and another mode is used
                                                          tures adjustments for optimal perfor-          when sensing under the influence of
                                                          mance, despite the effects of surface          blowing hot air.
                                                          turbulence (liquid level sensing), heat
                                                          waves (blowing hot air), or inductive
                                                          noise interference.




 Analog                                                 • The most reliable distance sensing, cal-     • Maximum analog output value corre-
                                                          culated using the optical triangle             sponds to minimum sensing distance
 Distance          SA1D      M-66                         between two points and the sensor.             and minimum analog value corresponds
 Sensors                                                • Analog output and digital output provided.     to maximum distance.




                                                        • One-touch positioning sensor.
 Photoelectric                                          • Background suppression.
                                                        • Visible beam makes precise alignment         • Single channel or dual-channel.
 Positioning       SA1L      M-70                         simple.                                      • Sensing range: 0.787" to 7.87".
 Sensors                                                • Remote set using an external signal.
                                                        • Available in two channels.




                   SA1C-FK   M-74
                                                        • Optimum performance under adverse
                                                          conditions including high temperatures,      • It is necessary to consider reduced
 Fiber Optic                                              inductive noise, and corrosive exposure.       maintenance expenses when evaluating
                                                        • Maintain integrity of sensing signal over
 Photoelectric                                            long distances.                                cost effectiveness.
 Sensors                                                                                               • Fiber optics do not withstand impact well
                                                        • Perfect for areas with minimal clear-          (may shatter).
                                                          ance. Fiber optic leads capable of great
                                                          flexibility for tight installations.
                   SA1C-F    M-84




                                                                               Through-Beam Photoelectric Sensors
                                                        • Most reliable of the photoelectric sen-      • Not suitable for sensing clear materials.
                                                          sors for detecting opaque objects.           • Use to detect small objects by installing
 Miniature
 Self-
                                                        • Longer sensing range than reflected-
                                                          light sensors.
                                                                                                         an optional slit for modifying beam size
                                                                                                         (order separately).
                                                                                                                                                     M
 Contained                                              • Adverse effects of dirt, dust, mist, con-    • When mounted in close proximity with
 Photoelectric     SA1C      M-95                         densation, droplets, oil, or film accumu-       other sensors or when extraneous light
 Sensors                                                  lation are minimal.                            interferes with detection, order the
                                                        • High-precision results when used for           optional slit separately.
                                                          positioning or leading-edge applications.    • Using the optional slit to modify beam
 (continued on                                          • Use for detection of labels on transpar-       size decreases sensing range.
 the next page)                                           ent containers.                              • Vibration tends to produce unreliable
                                                        • Highest excess gain (least chance for          results.
                                                          erroneous results due to inadvertent         • Two additional wires to install.
                                                          triggering).                                 • Sensing range: 32' - 9 3/4"




www.idec.com                        USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC                                              M-3
    Sensors                                                                                         SA1D: Analog Distance Detection Sensors

                                                               SA1D: Analog Distance Detection Sensors
    Key features of the SA1D include:
         • Triangulation ensures high-precision when sensing the presence or position of objects
         • Wide sensing range: 7.87" to 19.69" (200 to 500mm)
         • Select analog output (20 to 4mA) for continuous values; use digital output (on/off);
           or use both together
         • Far and near limits can be defined for detecting objects within a specified zone
         • A ten-dot LED level meter provides a dynamic display of detected positions and also shows near and far settings
         • Alarm output indicates when sensing conditions may result in inaccurate results




                                    Power Voltage              12 to 24V DC ± 10% (ripple 10% maximum)
                                    Current Draw               100mA (maximum)
                                    Dielectric Strength        Not specified due to capacitor grounding
                                    Insulation Resistance      Not specified due to capacitor grounding
                                                               0° to +55°C (performance will be adversely affected if the sensor becomes coated with
                                    Operating Temperature      ice)
          General Specifications




                                    Operating Humidity         35 to 85% RH (avoid condensation)
                                    Storage Temperature        –20° to +70°C
                                    Vibration Resistance       Damage limits: 10 to 55Hz, amplitude 1.5mm p-p, 2 hours in each of 3 axes (power off)
                                    Shock Resistance           Damage limits: 500m/sec2 (approximately 50G), 5 shocks in each of 3 axes
                                    Extraneous Light Immu-     Sunlight: 10,000 lux; Incandescent light: 3,000 lux (maximum)
                                                               — defined as the incident or unwanted light received by a sensor, unrelated to the
                                    nity                       presence or absence of the intended object
                                    Material                   Housing: Diecast zinc; Filter and lens: Acrylic
                                                               IP65 — IEC Pub 529; sensors rated IP65 are dust-tight, water-resistant, and perform
                                    Degree of Protection       best when not subjected to heavy particle or water blasts
                                    Cable                      Cable type: 5-core cabtyre cable 0.2mm2, 6'–6-3/4" (2m) long
                                    Weight                     Approximately 350g
                                    Dimensions                 2.68"H x 0.83"W x 1.97"D (68mm H x 21mm W x 50mm D)


                                    Analog Output             20 to 4mA, 5V (maximum), fixed range
                                                              NPN or PNP transistor open collector, 30V DC, 100mA (maximum),
                                    Digital Output
                                                              Residual: 1V (NPN), 2V (PNP)
                                                              NPN or PNP transistor open collector, 30V DC, 100mA (maximum),
                                    Alarm Output
                                                              Residual: 1V (NPN), 2V (PNP)
                                    Level Meter               Analog: Represents object distance corresponding to analog output on a 10-dot LED display
                                    (10-dot LED display)      Digital: Indicates near or far limit settings
          Function Specifications




                                    Out LED                   On: When digital output is on

M                                   Power LED                 On: When power is on
                                    Alarm LED                 On: When reflected light is excessive or insufficient
                                    Digital Output            Digital output and OUT LED turns on when object is within near and far limits
                                    Digital Output Setting    14-turn control for far/near setting (far and near limits can be set separately)
                                                              High-speed (F): 5ms (maximum)
                                    Response Time
                                                              Normal speed (S): 50ms (maximum)
                                                              High-speed: 4% (maximum)
                                    Repeat Error
                                                              Normal speed: 2% (maximum)
                                    Hysteresis                10% (maximum), defined as the difference between the operating point and the release point
                                    Light Source Element      Infrared LED (modulation mode)
                                    Wavelength                880 nm (infrared LED)
                                    Receiver Element          Position sensitive device (PSD)
                                    Detectable Object         Opaque




    M-66                                             www.idec.com                           USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC
          Sensors                                                                               SA1D: Analog Distance Detection Sensors
                                            Part Numbers: SA1D Sensors
                                              Part Number       Output        Sensing Range                            Reference Object
                                              SA1D-LK4          NPN           7.87" to 19.69" (200mm to 500mm)
                                                                                                                       White: 2.95" x 2.95" (75mm x 75mm)
                                              SA1D-LL4          PNP           7.87" to 19.69" (200mm to 500mm)



                                                                                          Applications




                                                                                                                           ➤
                                                                                                                      200mm or more




                                                                                                                           ➤
                                                         Analog output: Controlling tension                    Comparison output: Detecting overlap




                                                                                                         ;;
                                                                                                        ;;;;
                                                   Analog output: Identifying box size                Comparison or analog output: Sensing object zone




                                                                                                        ;;;;
                                                                                                                                                                   M

                                                                       Operation Principle


               The analog distance sensor projects a beam from the infrared                      Sensing Range
               LED, through the projection lens, to the object. The diffuse-                          19.69"
               reflected light from the object surface is received as a spot                          (500mm)
               image. This spot image moves from position A to B on the                             11.8"            7.87"
               position sensitive device (PSD). The optical triangle is used to                   (300mm)          (200mm)
               determine the distance between the sensor and the object,
               depending on the displacement.
                                                                                                                                          LED
                                                                                          A                       B
                                                                                                                                      A
                                                                                              LED: Projector                              PSD
                                                                                              PSD: Receiver                           B




www.idec.com                          USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC                                                          M-67
    Sensors                                                                              SA1D: Analog Distance Detection Sensors

                                                                                      Operation

       See page M-115 for general sensor instructions. Below are only consider-                                                   SLOW         FAST        Response
       ations specific to the SA1D analog sensors.                                                                   Digital                                Selector
                                                                                                               Output LED
                                                                                                                                          10               Alarm LED
       Digital output: Turns on, along with OUT LED, when the detected object is                                                           9
                                                                                                                                           8
       within near and far limits. (After turning the power on, allow approximately                                                        7               Power LED
       100ms for output to prevent a transient state.)                                                                                     6
                                                                                                                                           5               Level Meter
                                                                                                                                           4
                                                                                                                                           3               (ten-dot display)
       Response selector: Specify high-speed (“F” = 5ms) or normal speed (“S” =                                                            2
                                                                                                                                           1
       50ms). Use normal speed for the most reliable repetition. Also, normal speed                           Near Setting
                                                                                                                                                           Far Setting Dial
       is recommended for the best linearity, using analog output.                                                    Dial

       Alarm output: Turns on, along with ALARM LED, when sensing conditions                                                                              Monitor
       may result in inaccurate sensing, such as when the sensor head is dirty or                                                                         Mode Switch
       when there is insufficient reflected light. The comparison output and OUT indi-
       cator are turned off simultaneously.                                                    Far setting (FS) dial: Move the monitor mode switch to MON. Place the
                                                                                               object at the far limit position. Make sure that the object is within the sensing
       An internal circuit is provided to turn the output off for 100ms upon power up to       range. One of the LEDs on the ten-dot display will turn on — remember the
       prevent a transient state. This delay is normal when turning the power on.              position of this LED. (It will not stay on if object is moved.) Now move the
             1. Analog sensing of non-reflective, transparent, or liquid objects                monitor mode switch to FS.
                may not be possible.                                                                5. If the LED in the same position stays on, then the far setting is already
                                                                                                       in the desired position. There is no need to adjust the far setting.

       Near setting (NS) dial: Move the monitor mode switch to MON. Place the
       object at the near limit position. Make sure that the object is within the sens-        With monitor mode switch turned to FS, an LED on the ten-dot display should
       ing range. One of the LEDs on the ten-dot display will turn on — remember               be lit. If the LED is at a farther position (larger number) than the position noted
       the position of this LED. (It will not stay on if object is moved.) Now, move the       above, turn the near setting (NS) dial counterclockwise. If the LED is at a
       monitor mode switch to NS.                                                              nearer position (smaller number) than the position noted above, turn the near
                                                                                               setting (NS) dial clockwise.
             2. If the LED in the same position stays on, then the near setting is already
                in the desired position. There is no need to adjust the near setting.          Adjust the FS dial until the LED turns on — in the same position as noted
                                                                                               above on the ten-dot display.
       With the monitor mode switch turned to NS, an LED on the ten-dot display                     6. If the OUT LED is off, turn the FS dial toward “F” until it turns on.
       should be lit. If the LED is at a farther position (larger number) than the posi-               Make sure that the FS and NS settings are not reversed. If so, the OUT
       tion noted above, turn the near setting (NS) dial counterclockwise. If the LED                  LED will not turn on.
       is at a nearer position (smaller number) than the position noted above, turn
       the near setting (NS) dial clockwise.
                                                                                               Monitor mode switch: Set the near limit (NS) or far limit (FS) (to be used with
       Adjust the NS dial until the LED turns on — in the same position noted above            digital output—see below), or select MON to monitor object distance (corre-
       on the ten-dot display.                                                                 sponding to analog value) on the ten-dot display while operating the sensor.
              3. If the OUT LED is off, turn the NS dial toward “F” until the OUT
                 LED turns on. Make sure that the FS and NS settings are not                   Analog output: Provides current output ranging from 20 to 4mA in response
                                                                                               to object distance, as monitored on the ten-dot display. The relationship
                 reversed. If so, the OUT LED will not turn on.                                between analog output and distance is not exactly linear. Test output charac-
              4. If no LED on the ten-dot display turns on when the NS or FS dial is           teristics for each application.
                 turned to any dial setting, then the position of the object may be                 7. The sensor will hold an analog output of 4mA or less, only when
                 outside the range — closer than the near limit, 7.87" (200mm), or                     the incident light is sufficient.
                 farther than the far limit, 19.69" (500mm).

                                                                        Analog Output Characteristics

                                                                                                                         Analog
                                                                                                                         Output
                                                                                                                       20 mA
                                                                                                                       16 mA
                                                                                                                       12 mA
M          Set-Up Distance (mm)                               200mm        300mm        400mm      500mm                8 mA
           White Drawing         Noise Voltage                15mV         20mV        30mV        50mV
                                                                                                                        4 mA
                                                                                                                                                                   Detected
           Paper: Normal         Fluctuation Percentage       0.6%         0.7%        0.8%        0.9%                                                            Distance
                                                                                                                                   3.94" 7.87" 11.81" 15.75" 19.69"
           Response Speed        Distance Conversion          1.2mm        2.1mm       3.2mm       4.5mm                                (200mm)(300mm)(400mm)(500mm)
                                                                                                                                  (100mm)

           White Drawing         Noise Voltage                20mV         40mV        70mV        130mV                       Reference Object:
                                                                                                                               White: 2.95" x 2.95"
           Paper: High           Fluctuation Percentage       0.9%         1.4%        1.86%       2.34%                       (75mm x 75mm)
           Response Speed        Distance Conversion          1.8mm        4.2mm       7.4mm       12mm
           Black Drawing         Noise Voltage                15mV         30mV        40mV        60mV             Conversion to voltage output: Analog current output
           Paper: Normal         Fluctuation Percentage       0.6%         1.05%       1.06%       1.08%
                                                                                                                    can be converted to voltage output ranging from 1 to 5V by
                                                                                                                    connecting a resistor (supplied, or any R ≤ 250Ω) as
           Response Speed        Distance Conversion          1.2mm        3.1mm       4.2mm       5.4mm            shown below.
           Black Drawing         Noise Voltage                20mV         50mV        100mV       180mV
           Paper: High           Fluctuation Percentage       0.9%         1.75%       2.7%        3.24%                                       White
           Response Speed
                                 Distance Conversion          1.8mm        5.2mm       8.3mm       16mm                                                                  R≤     1 to 5
                                                                                                                                                       4 to 20mA         250Ω   Outpu
                                                                                                                                                 Shield




    M-68                        www.idec.com                                     USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC
                               Sensors                                                                                 SA1D: Analog Distance Detection Sensors

                       Effective Beam Characteristics                                                                               Installation

  Stand-Off Distance
    23.62"                                                                                   See M-116 for general sensor instructions. Below are only consider-
  (600mm)
      19.69"                                                                                 ations specific to the SA1D analog sensors.
  (500mm)
      15.75"
  (400mm)                                                                                    Install the sensor so that the optical window on the front of the sensor and
      11.81"                                                         Sensor                  the surface of the object are as parallel as possible.
  (300mm)
                                                                      Head
       7.87"
  (200mm)
       3.94"
  (100mm)                                         Side-to-Side
                                                  Distance           Reference Object:
         Left   0.39" 0.197"   0 0.197" 0.39" Right                  White: 2.95" x 2.95"
                (10mm) (5mm)      (5mm) (10mm)                       (75mm x 75mm)           To minimize fluctuations resulting from motion, make sure that the sensor is
                                                                                             mounted with the longitudinal axis perpendicular to the path of travel (as
                                                                                             shown in the correct figure to the right). Sensor output should be taken
                                                                                             when the projection beam falls exactly on the object.
                      Projected Beam Characteristics

                                                           Ø 0.79"
                                                    Ø 0.71" (20mm)
                                                     (18mm)                                               Incorrect                               Correct
                                          Ø 0.55"
                                Ø 0.47"   (14mm)
                                 (12mm)
                                                                                             When installing multiple sensors, provide the recommended clearance (as
                                                                    19.69"                   shown) to prevent the interference of signals.
                                                      11.81" 15.75" (500mm)
                                          7.87"       (300mm) (400mm)
                                          (200mm)

                                                                                                                                     Minimum
                                                                                                                                     Clearance
                                                                                                                                       7.87"
                                                                                                                                       (200mm)




          1. The beam spot is magnified for the purpose of these dimensions only.
                                                                                                     2. Bright light and strong magnetic fields may detract from the sensing
                                                                                                        accuracy. Avoid using the analog distance sensor in close proximity to
                                                                                                        bright light or strong magnetic fields.



                                   Schematics                                                                                   Dimensions


NPN                                                                                                           Center of
                                                   +V                                                         Projection
                                                                                             0.41"
                                                                                            (10.5mm)
                                                                                                              0.55"                              2.68" (68mm)
                                                             Load                                            (14mm)                                                 Ø 0.157"
                                                   OUT                                                                                                              (M4)
                                                                                                                                                                    Tapped
                                                                                                                                                                    Two Places
                                                   ALM
                                                                                                                           1.57"
  Main                                                           12 to                                                     (40mm)
  Circuit                                                       24V DC
                                                   GND                                                                 1.97"                                       6' – 6-3/4"
                                                                                                                       (50mm)                                      x Ø 0.2"
                                                   Analog                                                                                                          (2m x Ø 5mm)

                                                          20 to 4mA
                                                                            Analog
                                                                             Input              0.83"
                                                                                                                                                                                        M
                                             Shield                                            (21mm)                      0.24"
                                                                                                                           (6mm)
                                                                                                                                              2.44" (62mm)
                                                                                                                                      0.12"
                                                                                                                                     (3mm)

                                                                                            Wiring
PNP
                                                    +V                                        Wire Color              Name              Function
                                                                                               Brown                  +V                12 to 24V DC, 100mA (maximum)
  Main                                                          12 to
                                                               24V DC                          Black                  OUT               Digital Output, 30V DC, 100mA
  Circuit
                                                                                               Orange                 ALM               Alarm Output, 30V DC, 100mA
                                                    OUT
                                                              Load                             Blue                   GND               Power Ground (0 V)
                                                    ALM                                        White                  ANALOG            Analog Output, 20 to 4mA
                                                                                               Shield                 GND               Shield
                                                    GND
                                                    Analog
                                                                                                     3. An analog output line may be extended up to 33' (10m), as long as the
                                                                            Analog                      cable used is equal to or superior to the cable provided. Other lines
                                                          20 to 4mA          Input
                                                 Shield
                                                                                                        may be extended up to 164' (50m), using #22 AWG (0.3mm2) wire.




       www.idec.com                                           USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC                                                       M-69
                        Sensors                                                                                                           General Information

                                                                  General Information

                                Specifications                                                                   Extraneous Light

Do not operate a sensor under any conditions exceeding these specifications.         Bright, extraneous light such as sunlight, incandescent lights, or fluorescent
                                                                                    lights may impair the performance of sensors in detecting color or light.
Do not operate a sensor under current and voltage conditions other than those
for which the individual sensor is rated.                                                 3. SA6A ultrasonic sensors are not affected by extraneous light.

Do not exceed the recommended operating temperature and humidity.
Although sensors are rated for operation below 0°C, this specification does          Make sure that extraneous light does not exceed recommended levels found
not imply that performance characteristics will remain constant under pro-          in the individual specifications sections. When 500 lux is specified, this is
longed freezing conditions. Continued exposure and the accompanying frost,          equal to 50 footcandles. The average factory illumination is ordinarily below
ice, dew, and condensation which accumulate on the optical surface will             this level, except in areas where visual inspection is being performed. Only in
adversely affect sensor performance.                                                such brightly lit areas is incident light of particular concern.
To maintain superior performance characteristics, do not exceed vibration and       Unwanted light interference can often be avoided simply by making sure that
shock resistance ratings while operating a sensor. In addition, avoid isolated      the optical receiver is not aimed directly toward a strong light source. When
impacts to the sensor housing which are severe enough to adversely affect           mounting direction cannot be adjusted, place a light barrier between all
the waterproof characteristics.                                                     nearby light sources and the receiver.

           IEC (International Electrotechnical Commission) Ratings                                          Reflected-Light Sensors
Sensors rated IP67 are resistant to moisture when occasionally immersed in          When installing sensors which detect reflected light, make sure that
still water. Sensors rated IP64 through IP66 are resistant to moisture when         unwanted light reflections from nearby surfaces, such as the floor, walls,
occasionally subjected to splashing or when located in the vicinity of turbu-       reflective machinery, or stainless steel, do not reach the optical receiver.
lent waters. These ratings do not imply that a sensor is intended for use under
continual high-pressure water spray. Avoid such applications to maintain opti-      Also, make sure that reflected-light sensors mounted in close proximity do not
mal sensor performance.                                                             cause interfering reflections. When it is not possible to maintain the recom-
                                                                                    mended clearance between sensors, as noted in the individual installation
Sensors rated IP64 through IP67 are dust-tight and water-tight. For best per-       sections, provide light barriers between sensors.
formance, avoid using any sensor in an area where it will be subjected to
heavy particle blasts and where dust, water, or steam will accumulate on the
optical surface.
                                                                                                            Through-Beam Sensors
                                                                                    A slit attachment is available to modify the beam size of through-beam sen-
                                   Start-up                                         sors. This option is recommended for detecting very small objects (near the
                                                                                    size of the smallest object which a sensor can detect) or for eliminating light
Do not test the housing for dielectric strength and insulation resistance, since    interference when sensors are mounted in close proximity.
the housing is connected to the electronic circuit ground of a sensor. Do not
perform dielectric strength and insulation resistance tests on electrical sys-
tems without disconnecting photoelectric sensors, as such testing may result                                      Laser Sensors
in damage to the sensor.
                                                                                    IMPORTANT: Always consider safety when installing a laser sensor of any kind.
Several lines of sensors, as noted in the individual operation sections, are pro-   Make sure that the laser beam cannot inadvertently shine into the eyes of people
vided with an internal circuit to turn an output off for a specified amount of       passing by or working in the vicinity. See safety information on page H-55.
time upon power-up. This delay is normal; it prevents a transient state when
turning power on.

                                                                                                                     Mounting
                          Optimum Performance
                                                                                    The mounting bracket and hardware are included with sensors, where appli-
The optical surface of each sensor must be cleaned on a regular basis for con-      cable. Use the appropriate hardware for mounting, along with washers and
tinual superior performance. Use a soft cloth dipped in isopropyl alcohol to        spring washers or lock nuts. Do not overtighten attachment hardware. Over-
remove dust and moisture build-up.                                                  tightening causes damage to the housing and will adversely affect the water-
                                                                                    proof characteristics of the sensor.
IMPORTANT: Do not use organic solvents (such as thinner, ammonia, caustic
soda, or benzene) to clean any part of a sensor.                                    Best results can be obtained when the sensor is mounted so that the object
                                                                                    sensed is in the center of the beam, rather than when the object is located
All sensors experience signal inconsistencies under the influence of inductive
noise. Do not use sensors in close proximity to transformers, large inductive
                                                                                    near the edges of the sensing window. In addition, the most reliable sensing
                                                                                    occurs when the majority of the objects being sensed are well within the
                                                                                                                                                                       M
motors, or generators. Avoid using sensors in direct contact with sources of        sensing range, rather than at the extreme near and far limits.
excessive heat. Also avoid operation in close proximity to welding equipment.
     1.          Even though the SA6A ultrasonic sensor features protection
          against noise, there may be adverse effects from strong noise.

     2.            It is strongly recommended to avoid using any sensor where
          it will be continually subjected to elements which impair perfor-
          mance or cause corrosive damage to the sensor. In particular, avoid
          strong vibrations and shocks, corrosive gases, oils, and chemicals,
          as well as blasts of water, steam, dust, or other particles.




    www.idec.com                                    USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC                                               M-115
    Sensors                                                                                                            General Information

                                           Wiring                                                                             Glossary

       Avoid running high-voltages or power lines in the same conduit with sensor           Attenuation: Reduction of beam intensity as a result of environmental fac-
       signal lines. This prevents inaccurate results or damage from induced noise.         tors such as dust, humidity, steam, etc.
       Use a separate conduit when the influence of power lines or electromagnetic
       equipment may occur, particularly when the distance of the wiring is extended.       Dark on: Output energized when light is not detected by the receiving ele-
                                                                                            ment. For through-beam sensors, light from the projector is not detected by
       IMPORTANT: Connect the sensor cables and wires as noted in the individual            the receiver when an object is present. For reflected light sensors, light is not
       Wiring sections. Failure to connect as shown in wiring diagrams will result in       detected when it is not reflected from an object surface.
       damage to the internal circuit.
                                                                                            Diffuse-reflected light sensors: Sensors that detect all scattered, reflected
       When extending sensor cables and wires, make sure to use cables equal or             light. Light reflected from nearby surfaces, as well as intended object surface,
       superior to that recommended in the individual specifications sections.               is detected. Diffuse-reflected light sensors are often called “proximity
                                                                                            switches,” since they switch when any object is near. Also use to detect color
       When wiring terminals, be sure to prevent contact between adjoining termi-           contrast when colors reflect light intensity differently (green LED recom-
       nals. When using ring or fork lug terminals, use the insulated sleeve style          mended for this application).
       only. Each sensor terminal can accept only one ring of fork lug terminal.
                                                                                            EEPROM: Acronym which stands for electronically erasable, programmable,
       On ISF series photoelectric sensors, use recommended cable, along with the           read only memory.
       attached packing gland and washer, when wiring the terminals. This ensures
       waterproof and dustproof characteristics.                                            Excess gain: Ratio of optical power available at a given projector-to-receiver
                                                                                            range divided by the minimum optical power required to trigger the receiver.
                                      Power Supply                                          Extraneous light: Incident light received by a sensor, irrelated to the presence
                                                                                            or absence of object being detected. Extraneous light is usually unwanted
       Noise resistance characteristics are improved when a sensor is grounded to           background light such as sunlight and incandescent lamps in close proximity.
       the 0V power terminal. If the 0V power terminal is not at ground potential, use
       a ceramic 0.01µF capacitor which can withstand 250V AC minimum.                      ∆E: The measurement of color difference as a three-variable function, located
                                                                                            on an XYZ axis of light, hue, and chroma values.
       When using a switching power supply, be sure to ground the FG terminal to
       eliminate high-frequency noise. The power supply should include an insulat-          Hysteresis: Operating point and release point at different levels. For solid
       ing transformer, not an autotransformer.                                             state sensors, this is accomplished electrically. For mechanical switches, it
                                                                                            results from storing potential energy before the transition occurs.
       On ISF series photoelectric sensors, the power supply should be sized accord-
       ing to the voltage drop through the lead wire when using a long extension for        Light on: Output energized when light is detected by receiving element. For
       the DC type (328' or 100m maximum extension).                                        through-beam sensors, light from the projector is detected by the receiver
                                                                                            when an object is not present. For reflected light sensors, light is detected
                                                                                            when it is reflected from an object surface.
                                      Power Supply
                                                                                            Linearity: Measurement of how nearly linear, that is, how accurate actual
       The compact PS5R-A power supply is the perfect companion item for most               analog output is, with respect to distance.
       IDEC sensors (except the SA1K—see note below). This power supply is only
       1.77" (45mm) wide, 3.15" (80mm) tall, and 2.76" (70mm) deep. Call an IDEC            NPN/PNP: Types of open collector transistors. NPN is a sink transistor; out-
       representative for more details.                                                     put on establishes negative potential difference. PNP is a source transistor;
                                                                                            output on establishes positive potential difference.
         Part Number                             Output Ratings                             Polarizing: Filtering out all reflected light except that which is projected in
         PS5R-A12                                 12V DC, 0.62A                             one plane only. Polarized retro-reflected light sensors detect the light from
                                                                                            corner-cube type reflectors when an object is not present.
         PS5R-A24                                 24V DC, 0.32A
                                                                                            Reflected-light sensors: Sensors with the projector and receiver in one
                                                                                            housing. Light is projected by the light source, and reflected light is received
               The SA1K full color recognition sensor requires a different power            by the optical surface. Includes diffuse-reflected, retro-reflected, limited-
               supply, such as IDEC’s PS5R-B12. Call an IDEC representative for             reflected, and spot-reflected sensors as explained on page H-98.
               more details.                                                                Repeatability: Ability of a sensor to reproduce output readings consistently
                                                                                            when the same value is applied consecutively, in the same direction, for a
                                                                                            specified number of cycles, or for a specified time duration.
                                     Miscellaneous
                                                                                            Resolution: Overall dimension of the smallest object which can be detected
                                                                                            (when sensing the presence of an object) or smallest increment of distance
       Strong magnetic fields may detract from the accuracy of the sensing measure-          which can be distinguished with reliable results (when sensing the position of
M      ment. Avoid mounting a sensor directly to machinery, since the housing is con-       an object).
       nected to the electronic circuit ground of the sensor. If it is necessary to mount
       a sensor on machinery, use the insulating plate and sleeve provided.                 Response time: Time elapsed between input and output. Total response time
                                                                                            is the sum of object detection, amplifier response, and output response times.
                                                                                            Retro-reflective scan: This type of reflected light sensor uses a special
                                                                                            reflector to return projected light when an object is not present. Sensor
                                                                                            detects the presence of an object when the light is reflected differently.
                                                                                            Through-beam sensors: Sensors with a separate projector and receiver.
                                                                                            The light source from the projector is detected by the receiver, except when
                                                                                            an object is present.
                                                                                            Transient: Undesirable surge of current (many times larger than normal cur-
                                                                                            rent) for a very short period, such as during the start-up of an inductive motor.




    M-116                       www.idec.com                                    USA: (800) 262-IDEC or (408) 747-0550, Canada (888) 317-IDEC

				
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posted:1/23/2013
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