Catalog Section - U906
Analog Distance Sensors
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
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
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.
• 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.
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
• Longer sensing range than reﬂected-
an optional slit for modifying beam size
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"
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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)
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),
Residual: 1V (NPN), 2V (PNP)
NPN or PNP transistor open collector, 30V DC, 100mA (maximum),
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
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)
Normal speed (S): 50ms (maximum)
High-speed: 4% (maximum)
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
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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)
200mm or more
Analog output: Controlling tension Comparison output: Detecting overlap
Analog output: Identifying box size Comparison or analog output: Sensing object zone
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: Projector PSD
PSD: Receiver B
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Sensors SA1D: Analog Distance Detection Sensors
See page M-115 for general sensor instructions. Below are only consider- SLOW FAST Response
ations speciﬁc to the SA1D analog sensors. Digital Selector
10 Alarm LED
Digital output: Turns on, along with OUT LED, when the detected object is 9
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
3 (ten-dot display)
Response selector: Specify high-speed (“F” = 5ms) or normal speed (“S” = 2
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
M Set-Up Distance (mm) 200mm 300mm 400mm 500mm 8 mA
White Drawing Noise Voltage 15mV 20mV 30mV 50mV
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)
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
Distance Conversion 1.8mm 5.2mm 8.3mm 16mm R≤ 1 to 5
4 to 20mA 250Ω Outpu
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Sensors SA1D: Analog Distance Detection Sensors
Effective Beam Characteristics Installation
23.62" See M-116 for general sensor instructions. Below are only consider-
19.69" ations speciﬁc to the SA1D analog sensors.
(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.
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 0.71" (20mm)
(18mm) Incorrect Correct
Ø 0.47" (14mm)
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)
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.
NPN Center of
0.55" 2.68" (68mm)
Load (14mm) Ø 0.157"
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
Shield (21mm) 0.24"
+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
Orange ALM Alarm Output, 30V DC, 100mA
Load Blue GND Power Ground (0 V)
ALM White ANALOG Analog Output, 20 to 4mA
Shield GND Shield
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
may be extended up to 164' (50m), using #22 AWG (0.3mm2) wire.
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Sensors 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
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.
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
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.
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Sensors General Information
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.
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.
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.
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