
Using ProLink
®
Software with Micro Motion
®
Transmitters
149
Calibrate Menu
continued
Temperature calibration for RFT9739
Applications Menu Help Menu
Configure Menu:
Meter Factors
Calibrate Menu Test Menu
Temperature calibration, performed while process fluid flows through the
sensor at line conditions, adjusts the slope and offset of the equation
used for calculating flow tube temperature. Performing a temperature
calibration on an RFT9739 involves using a low-temperature calibration
fluid to establish the offset and a high-temperature calibration fluid to
establish the slope, then recalibrating the flowmeter for flow, density, and
viscosity.
During temperature calibration, write values in the appropriate
Flowmeter Calibration Record, shown in
Appendix F
.
Temperature calibration is not recommended, and will require
complete
recalibration of the flowmeter for flow, density, and viscosity
measurement.
To calibrate the flowmeter for temperature:
1. Choose degrees Celsius (°C) as the temperature unit:
a. Open the Configure menu, then choose Transmitter Variables.
b. In the Configure Transmitter Variables dialog box, open the Units
list box in the Temperature frame, then select °C.
c. Click OK.
2. To perform the temperature offset calibration:
a. Pump a process fluid through the sensor at the lowest
temperature measured during the application.
b. Wait approximately five minutes for the flow tube temperature to
stabilize.
c. Use a highly accurate thermometer, temperature sensor, or
another device to measure the temperature of the process fluid.
d. Open the Calibrate menu, then choose Temperature. At the
cascading menu, choose Offset Calibration to open the
Temperature Offset Calibration dialog box, shown in
Figure 14-11
.
e. Enter the temperature that was measured in step 2c into the
Enter Temp text box, then choose Do Cal. The transmitter
calculates the offset of the linear representation of temperature
and stores the value internally for use in the slope calibration.
The temperature calibration factor will not change until slope calibra-
tion is complete. Power must not be interrupted between offset and
slope calibration.
Komentarze do niniejszej Instrukcji