Emerson Rosemount MCL-220 Reference Manual page 54

Calibrate
May 2019
3% per °C at 77 °F (25 °C), so a 1 °C error in temperature produces about a 3% error in the
reading.
Without calibration, the accuracy of the temperature measurement is about ±0.4 °C.
Calibrate the sensor/transmitter unit if:
1. ±0.4 °C accuracy is not acceptable.
2. The temperature measurement is suspected of being in error. Calibrate
Procedure
1. Remove the sensor from the flow cell. Place it in an insulated container of water
2. Allow the sensor to reach thermal equilibrium.
3. Press MENU.
4. Press ENTER.
5. Choose the sensor you wish to calibrate.
6. Choose Temperature.
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temperature by making the transmitter reading match the temperature measured
with a standard thermometer.
along with a calibrated thermometer. Submerge at least the bottom two inches of
the sensor.
The time constant for the sensor is about five minutes, so it may take as long as
thirty minutes for equilibration.
The main Menu screen appears. The cursor is on Calibrate.
Sensor 1 is the monochloramine sensor.
Reference Manual
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Emerson.com/Rosemount