Get documents about "QP002 - Thermometer Calibration _2001-7-12_
Document Sample
29 Palms Laboratory Title: Thermometer Calibration
47-250 Dillon Road Number: QP002
Coachella, Ca 92236 Release Date: 1-4-00
Phone: 760-398-0050 Revision Date: 7-12-01
Fax: 760-398-0028 Version: 1.0
DOCUMENT TYPE: Standard Operating Procedure
DOCUMENT CLASS: Quality Assurance Procedure
TITLE: Thermometer Calibration
PREPARED BY: Jeanette de la Rosa, Quality Assurance Officer __________________
REVISED BY: Jeanette de la Rosa, Quality Assurance Officer __________________
REVIEWED BY: Anne Cheung, Laboratory Manager __________________
APPROVED BY: Marshall K. Cheung, Ph.D., Laboratory Director __________________
Table of Contents
1. Scope and Application.................................................................................................3
2. Summary of Procedure................................................................................................3
3. Comments....................................................................................................................3
4. Equipment....................................................................................................................3
5. Procedure.....................................................................................................................4
6. Quality Control............................................................................................................4
7. Bibliography ................................................................................................................4
Page 1 of 4
29 Palms Laboratory Title: Thermometer Calibration
47-250 Dillon Road Number: QP002
Coachella, Ca 92236 Release Date: 1-4-00
Phone: 760-398-0050 Revision Date: 7-12-01
Fax: 760-398-0028 Version: 1.0
Document No.: QP002 – 03
Copy provided to: Pat Galaz
Title:
Agua Caliente Band of Cahuilla
Indians
600 E. Tahquitz Canyon Way
Palm Springs, CA 92262
Copy provided by: Jeanette de la Rosa
Title: Quality Assurance Officer
Date: June 30, 2005
Page 2 of 4
29 Palms Laboratory Title: Thermometer Calibration
47-250 Dillon Road Number: QP002
Coachella, Ca 92236 Release Date: 1-4-00
Phone: 760-398-0050 Revision Date: 7-12-01
Fax: 760-398-0028 Version: 1.0
1. Scope and Application
1.1. This procedure outlines the steps necessary to determine calibration factors for laboratory
thermometers.
1.2. Accurate temperature recording devices are essential to the daily monitoring of equipment that
ensures sample and chemical integrity and proper testing procedure.
2. Summary of Procedure
2.1. Thermometers are assigned a unique number and immersed in liquid.
2.2. Readings are taken from each of the laboratory thermometers at three different temperatures and
compared to readings from a reference thermometer that is NIST (National Institute of
Standards and Technology) certified.
2.3. Frio-Temp thermometers are only calibrated against the standard thermometer in ice water or
in liquid at refrigerator temperature (use specified).
2.4. Temperatures and calibration factors are entered into an electronic spreadsheet and posted in
laboratory for reference as well as filed in a Thermometer Calibration notebook.
3. Comments
3.1. A thermometer must only be used at a temperature where its deviation from a standard
thermometer does not differ by more than 1o as noted on calibration table.
3.2. Thermometers must be immersed in liquid for the calibration. The liquid used in 29 Palms
Laboratory, unless otherwise indicated, is Coachella Valley Water District municipal water.
3.3. The thermometer to be calibrated as well as the reference thermometer must be immersed in
liquid to the immersion line, if present. If a thermometer has no immersion line, it must be
immersed far enough so that the entire mercury column is submerged.
3.4. If a thermometer is dedicated to a single use, a label will be attached indicating the correction
factor at the temperature of use.
3.5. The NIST certified thermometer must be recalibrated every 3-5 years.
3.6. Mannix Data-Therm 21060/21061 Digital Thermometers
3.6.1. Thermometer has maximum and minimum memory feature.
3.6.2. External probe range is –40o to +80o C.
3.6.3. Internal probe range is −10o to +80o C.
3.6.4. Only external reading will be reported for calibration.
3.6.5. Accuracy is ± 1.0o C.
3.7. VWR Long-Stem Thermometers
3.7.1. Range is –50o to 150o C.
3.7.2. Accuracy is ± 1.0o C.
4. Equipment
4.1. Mannix Data-Therm 21060/21061 Digital Thermometers
4.2. VWR Long-Stem Thermometers (Cal. Dt. 8/31/98)
4.3. Frio-Temp Refrigerator and Freezer Thermometers
4.4. Various laboratory glass mercury thermometers
4.5. HB Instrument Company traceable thermometer (-1o to 101o C); Cat. No. 61222-662, Lot No.
HB 9787, Received: 11/99.
4.6. Flasks or beakers
Page 3 of 4
29 Palms Laboratory Title: Thermometer Calibration
47-250 Dillon Road Number: QP002
Coachella, Ca 92236 Release Date: 1-4-00
Phone: 760-398-0050 Revision Date: 7-12-01
Fax: 760-398-0028 Version: 1.0
5. Procedure
5.1. Immerse all thermometers (except Frio-Temp) in 250 ml of water.
5.2. Allow water to come to room temperature (approximately two hours).
5.3. Read temperature values given by each thermometer.
5.3.1. Mannix digital thermometers:
5.3.1.1. Read digital display in oC.
5.3.1.1.1. Press [IN/DATE] key to display date if internal temperature is shown instead
of the month and day.
5.3.1.1.2. Press [MAX/MIN] button if display shows anything other than date, time and
“out” in upper left hand corner (e.g. max or min below temperature reading).
5.3.2. VWR traceable Long-Stem Thermometers:
5.3.2.1. Read digital display in oC.
5.3.3. Glass mercury thermometers:
5.3.3.1.Read height in mercury and corresponding temperature.
5.4. Record thermometer readings as room temperature values.
5.5. Repeat 5.1- 5.4 at 35o (in incubator) or at 45o (in waterbath).
5.6. Record thermometer readings.
5.7. Repeat 5.1- 5.4 in a refrigerator (~ 3o C) including Frio-Temp thermometers.
5.8. Record thermometer readings.
5.9. Alternatively, the Frio-Temp thermometers can be calibrated against the reference
thermometer in ice water or in the associated liquid placed in refrigerator.
5.10. Enter all information in electronic file under 29 Palms Laboratory Management-
Thermometer Calibration.
5.11. Calculate correction factors for each thermometer based on differences in readings at
each temperature from the reference thermometer.
5.12. Post printed copies of Thermometer Calibration Table around laboratory and file in
Thermometer Calibration notebook.
5.13. Relabel thermometers as needed.
6. Quality Assurance/Quality Control
6.1. Thermometers must be calibrated against a reference NIST thermometer semi-annually (twice
per year).
6.2. The reference thermometer must be recalibrated every 3-5 years.
6.3. Thermometers must be graduated in 0.5o increments or less for use in incubators and 1o or less
for use in other equipment.
6.4. Certificates of Calibration for traceable thermometers as well as Thermometer Calibration
Tables are maintained in a 3-ring binder in the laboratory.
7. Bibliography
7.1. Standard Methods for the Examination of Water and Wastewater, 20th Ed. 1998 Quality
Assurance/Quality Control, pp. 9-4 to 9-5.
7.2. 29 Palms Laboratory Quality Assurance Plan (QAP).
Page 4 of 4
