Thermometer Calibration Chart
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3APPENDIX IV:
Thermometer Calibration
Temperature is a critical measurement for ensuring the quality of fruits and vegetables
and therefore recording proper temperatures is a very important part of performing an
inspection. Thermometers should be calibrated on a regular basis, specifically
whenever they are dropped or if the inspector will be going from one temperature
extreme to another. In addition, it is recommended that each inspector keep a
thermometer calibration log.
There are two methods for calibrating thermometers: the ice point method and the
boiling point method. Thermometers should be calibrated, using both methods, on a
regular basis (no less than once per month).
Ice Point Method:
Fill a large glass with crushed ice. Add clean tap water until the glass is full and stir well.
When the mixture of the water has stabilized in about four or five minutes, insert the
thermometer stem or probe in the ice water mixture so that the entire sensing area is
submerged. Do not let the stem of the thermometer or probe touch the sides or bottom
of the glass.
Wait at least two minutes or until indicator stops moving. The temperature on the
o
o
thermometer should read 0
C plus or minus 1.0
C. If the temperature falls outside this
range, make adjustments according to the thermometer’s manual to achieve accuracy.
If accuracy is unattainable, replace the thermometer.
Boiling Point Method:
Bring clean tap water to a complete boil (i.e. rolling boil) in a deep container (greater
than 25 cm or 10 inches).
Put the thermometer stem or probe into the boiling water so that the sensing area is
completely submerged. Do not let the stem or probe touch the bottom or sides of the
container. Wait at least two minutes or until indicator stops moving. The temperature
o
should be noted after the temperature has stabilised and must be between 100
C plus
o
or minus 1.0
C. If the temperature falls outside this range, make adjustments
according to the thermometer’s manual to achieve accuracy. If accuracy is
unattainable, replace the thermometer.
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