152
Reference Manual
00809-0300-4750, Rev CA
March 2016
8.6
Trims
Trims are used to calibrate the analog loop, calibrate the transmitter, re-zero the
transmitter, and calibrate the transmitter with another manufacturer's sensor. Proceed with
caution whenever performing a trim function.
8.6.1
D/A trim
The
D/A trim
is used to calibrate the 4-20mA analog loop output from the transmitter. For
maximum accuracy, the analog output should be trimmed for your system loop. Use the
following steps to complete the output trim function.
1.
Set the loop to manual, if necessary.
2.
Connect a precision ammeter in the 4-20mA loop.
3.
Initiate the
D/A trim
function.
4.
Enter the 4mA meter value when prompted to do so.
5.
Enter the 20mA meter value when prompted to do so.
6.
Return the loop to automatic control, if necessary.
The 4-20mA trim is now complete. The
D/A trim
can be repeated to check the results.
Alternatively, the analog output test can also be used to verify loop performance.
LOI menu path
Field Mount: Diagnostics, Trims
Wall Mount: AUX. FUNCTION
Traditional Fast Keys
1, 2, 5
Device dashboard
3, 4
LOI menu path
Field Mount: Diagnostics, Trims, D/A Trim
Wall Mount: AUX. FUNCTION
Traditional Fast Keys
1, 2, 5, 1
Device dashboard
3, 4, 4, 5
Содержание Rosemount 8750W
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