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5 Service and maintenance
266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB
| 63
Calibrating the process temperature sensor
The process temperature input can be calibrated to match the user’s reference over a range of -80 °F to +1500 °F. To calibrate
the input use the following steps.
IMPORTANT NOTE:
If using a RTD simulator or digital RTD calibrator, remove the RTD from the transmitter
and wire the connections according to the calibrator documentation.
1.
Use the key pad to locate and select
Calibrate
>
Process Temp. Sensor
>
Low Trimming
.
2.
Set the input to the lowest thermal point expected from the application:
a.
Allow the display to stabilize, showing the current measured value. When stabilized, continue.
b.
Enter the low value in the
New
field.
i.
To enter a value, use the up or down arrow to locate the value of the first digit. When selected, press the left soft
key for
Next
. This moves the cursor to the next digit.
ii.
Repeat this pro
cess for each digit until the entire low value is selected. To change a digit’s value after moving
past it, select the
Next
key until the cursor reaches the incorrect digit then change it.
c.
When the value is equal to the value of the calibrator, then select
Continue
. The user should now see the indication
that the low trim calibration is complete.
3.
Select
High Trimming
from the menu.
a.
Set the input to the highest thermal point expected from the application.
b.
The display will have the current measured value. Select
Continue
when the reading is stable.
c.
Enter the high value in the
New
field.
i.
To enter a value, use the up or down arrow to locate the value of the first digit. When selected, press the left soft
key for
Next
. This moves the cursor to the next digit.
ii.
Repeat this process for each digit until the entire high
value is selected. To change a digit’s value after moving
past it, select the
Next
key until the cursor reaches the incorrect digit then change it.
d.
When the value is equal to the value of the calibrator, then select
Continue
. The user should now see the indication
that the low trim calibration is complete.
4.
Select
Save to User
.
a.
Select
OK
.
b.
The bar graph will show the status of the save.
5.
Select
Exit
to return to the main screen.
6.
Remove the RTD simulator or calibrator and re-attach the RTD wiring.
7.
When the DP, SP, and process temperature sensors have been calibrated, follow the procedure in section 4.3.4,
to return the transmitter to operation.
The process temperature sensor is now calibrated
.
Содержание 266 MODBUS
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