Reference Manual
00809-0100-4801, Rev FA
October 2010
4-9
Rosemount 3051S Series
Digital-to-Analog Trim
Using Other Scale
The Scaled D/A Trim command matches the 4 and 20 mA points to a user
selectable reference scale other than 4 and 20 mA (for example, 1 to 5 volts if
measuring across a 250 ohm load, or 0 to 100 percent if measuring from a
Distributed Control System (DCS)). To perform a scaled D/A trim, connect an
accurate reference meter to the transmitter and trim the output signal to scale,
as outlined in the Output Trim procedure.
NOTE
Use a precision resistor for optimum accuracy. If you add a resistor to the
loop, ensure that the power supply is sufficient to power the transmitter to a
23 mA output (maximum alarm value) with additional loop resistance.
Field Communicator
Enter the fast key sequence “Digital-to-Analog Trim Using Other Scale.”
AMS
Right click on the device and select “Calibrate,” then “Scaled D/A trim” from
the menu
.
1. Click
Next
after setting the control loop to manual.
2. Select
Change
to change scale, click
Next
.
3. Enter Set scale-Lo output value, click
Next
.
4. Enter Set scale-Hi output value, click
Next
.
5. Click
Next
to proceed with Trim.
6. Click
Next
after connecting the reference meter.
7. Click
Next
at the “Setting fld dev output to 4 mA” screen.
8. Record the actual value from the reference meter, and enter it at the
“Enter meter value” screen and click
Next
.
9. Select
Yes
, if the reference meter value equals the transmitter output
value, or
No
if it does not. Click
Next
.
a. If Yes is selected, proceed to Step 10.
b. If No is selected, repeat Step 8.
10. Click
Next
at the “Setting fld dev output to 20mA” screen.
11. Repeat Step 8 - Step 9 until the reference meter equals the transmitter
output value.
12. Select
Next
to acknowledge the loop can be returned to automatic
control.
13. Select
Finish
to acknowledge the method is complete.
Fast Keys
1, 2, 3, 2, 2
Device Dashboard
Fast Keys
3, 4, 2, 2
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