Emerson 2200S Manuel D’Utilisation
78
Micro Motion
®
Model 2200S Transmitters
Testing and Moving to Production
Figure 7-6
ProLink II – Loop test procedure
7.4
Trimming the milliamp output
Trimming the mA output creates a common measurement range between the transmitter and the device
that receives the mA output. For example, a transmitter might send a 12 mA signal that the receiving
device reports incorrectly as 12.2 mA. If the transmitter output is trimmed correctly, it will send a
signal appropriately compensated to ensure that the receiving device actually indicates a 12 mA
signal.
that receives the mA output. For example, a transmitter might send a 12 mA signal that the receiving
device reports incorrectly as 12.2 mA. If the transmitter output is trimmed correctly, it will send a
signal appropriately compensated to ensure that the receiving device actually indicates a 12 mA
signal.
Note: If a barrier or the Micro Motion adapter-barrier is installed, the mA output trim procedure can
be extended to include additional trimming and calibration. See Section 7.4.2.
be extended to include additional trimming and calibration. See Section 7.4.2.
You must trim the mA output at both the 12 mA and 20 mA points to ensure appropriate
compensation across the entire output range.
compensation across the entire output range.
7.4.1
Basic mA output trim
To trim the output:
•
Using the Communicator, see Figure 7-7.
•
Using ProLink II, see Figure 7-8.
Additionally, if you are using a Communicator, you can perform a scaled AO trim. The scaled AO
trim is used when the reference meter’s low and high values are not 4 and 20 mA. To perform a scaled
AO trim, see Figure 7-9.
trim is used when the reference meter’s low and high values are not 4 and 20 mA. To perform a scaled
AO trim, see Figure 7-9.
Fix Milliamp
Enter mA value
Read output at receiving
device
Correct?
Check output wiring
Troubleshoot receiving device
Troubleshoot receiving device
Yes
No
ProLink Menu >
Test
Test
Fix mA
Unfix
Set mA measurement point