Emerson Network Router - Manual (Page 46)

40 ProLink ® II Software for Micro Motion ® Transmitters
Initial Transmitter Startup Procedures
Figure 4-3 Milliamp trim wizard – Screen 2
If the adjusted output is not 4.0:
a. Click Back .
b. Read the output level at the receiving device and enter the new value in the Enter Meas
box.
c. Click Next .
d. Repeat until the adjusted output is 4.0 (or close enough for your application).
If the adjusted output is 4.0, click Next .
7. Click Next to repeat this procedure to trim the 20 mA output.
Once you have completed the 20 mA trim, the procedure is complete. Click Finish .
4.4 Zeroing the meter
Zeroing the meter establishes the meter’s point of reference when there is no flow. Zeroing is not
universally required for proper flowmeter operation. If you are unsure about whether you need to
zero, contact Micro Motion.
When you zero the meter, you may need to adjust the zero time parameter. Zero time is the amount of
time the transmitter takes to determine its zero-flow reference point. The default zero time is
20 seconds, which is appropriate for most applications.
• A long zero time may produce a more accurate zero reference but is more likely to result in a
zero failure. This is due to the increased possibility of noisy flow, which causes incorrect
calibration.
• A short zero time is less likely to result in a zero failure but may produce a less accurate zero
reference.
Do not zero the meter if a high severity alarm is active. Correct the problem, then zero the meter. You
may zero the meter if a low severity alarm is active. See Section 3.8 for information on viewing
transmitter status and alarms.
Note: In some menus, a convergence limit parameter is displayed. This parameter applies only to the
RFT9739 transmitter. Micro Motion recommends that you use the default value for convergence limit.