Emerson Network Router - Manual (Page 45)

Installation and Use Manual 39
Initial Transmitter Startup Procedures
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Note the following:
• If you have two mA outputs, you should trim both.
• You must trim the output at both the 4 mA and 20 mA points to ensure appropriate
compensation across the entire output range.
• If you are trimming the primary mA output, and you are connected to the transmitter via the
primary mA output (HART/Bell 202), the communication signal to ProLink II will affect the
reading. Disconnect ProLink II before reading the output, then reconnect and resume the trim,
after taking the reading. If you are using any other protocol, this is not required.
• Any trimming performed on the output should not exceed ±200 microamps. If more trimming
is required, contact Micro Motion customer support.
To trim mA outputs, choose ProLink > Calibration > Milliamp 1 Trim or ProLink > Calibration >
Milliamp 1 Trim . You can also initiate mA trim from the Commissioning Wizard:
1. Choose Tools > Commissioning Wizard .
2. Click Task 6: Trim mA outputs .
3. Click Next .
Figure 4-2 Milliamp trim wizard – Screen 1
This screen allows you to compare the transmitter output (the Present Output value) to the
output level being received at an external device.
4. Read the mA output level at the receiving device.
5. Type the value that you read at the receiving device in the Enter Meas box.
6. Click Next . At this point, the transmitter trims the milliamp output and displays the adjusted
output in the following screen: