MODEL | SECTION 9.0 |
| CALIBRATION – TEMPERTURE |
9.2.2 Procedure
1.Remove the sensor from the process. Place it in an insulated container of water along with a calibrated ther- mometer. Submerge at least the bottom two inches of the sensor. Stir continuously.
2.Allow the sensor to reach thermal equilibrium. For some sensors, the time constant for a change in tempera- ture is 5 min., so it may take as long as 30 min. for temperature equilibration.
3.If the sensor cannot be removed from the process, measure the temperature of a flowing sample taken from a point as close to the sensor as possible. Let the sample continuously overflow an insulated container hold- ing a calibrated thermometer.
4.Change the 6081 display to match the calibrated thermometer using the procedure below.
1.Press MENU. The menu screen appears. Choose Calibrate.
2.Choose Temp.
3.If transmitter was programmed in Section 8.4 to use the actual process temperature, go to step 7. If the transmitter was programmed to use a temperature entered by the user, go to step 9.
4.To calibrate the temperature, change the number in the second line to match the temperature measured with the standard thermometer. Press ENTER.
5.Press MENU then EXIT to return to the main display.
6.If the temperature value shown in the display is not correct, use the arrow keys to change it to the desired value. The transmitter will use the temperature entered in this step in all measurements and calculations, no matter what the true temperature is.
7.Press MENU then EXIT to return to the main display.
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