Emerson MICRO MOTION 1500, Configuration And Use Manual, Page: 48 / 282

38 Micro Motion Series 1000 and Series 2000 Transmitters
Flowmeter Startup
5.4 Trimming the milliamp outputs
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 4 mA signal that the receiving
device reports incorrectly as 3.8 mA. If the transmitter output is trimmed correctly, it will send a
signal appropriately compensated to ensure that the receiving device actually indicates a 4 mA signal.
You must trim the mA output at both the 4 mA and 20 mA points to ensure appropriate compensation
across the entire output range.
Perform a milliamp trim on all mA outputs available on your transmitter. Before performing the trim,
ensure that your transmitter’s channels are configured for the input/outputs that will be used in your
application (see Section 6.3).
You can trim the outputs with ProLink II or a Communicator. The general procedure for performing a
milliamp trim is shown in Figure 5-2.
Notes: If you are using either a Communicator or ProLink II via HART/Bell 202, the HART signal
will affect the primary mA reading. While trimming the primary mA output, disconnect the
Communicator or ProLink II before reading the output, then reconnect the Communicator or
ProLink II and resume the trim procedure after taking the reading.
Any trimming performed on the output should not exceed ±200 microamps. If more trimming is
required, contact Micro Motion customer support.
Figure 5-2 Trimming the milliamp output
Read mA output at
receiving device
Read mA output at
receiving device
Equal?
Enter receiving device
value
Done
No
Yes
Perform the procedure for
each mA output at both
4 mA and 20 mA.