Emerson Network Router Manuel D’Utilisation
48
ProLink
®
II Software for Micro Motion
®
Transmitters
Initial Transmitter Startup Procedures
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.
Note: Not all transmitters require startup zeroing. Consult the manual for your transmitter.
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.
time the transmitter takes to determine its zero-flow reference point. The default zero time is
20 seconds.
•
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.
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.
reference.
For most applications, the default zero time is appropriate.
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.
RFT9739 transmitter. Micro Motion recommends that you use the default value for convergence limit.
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.
may zero the meter if a low severity alarm is active. See Section 3.8 for information on viewing
transmitter status and alarms.
To zero the meter:
1. Prepare the meter for zeroing:
a.
Apply power to the meter. Wait several minutes to allow the meter to warm up:
•
For IFT or RFT transmitters, wait for approximately 30 minutes.
•
For Series 1000/2000/3000 transmitters and MVD Direct Connect, wait for
approximately 20 minutes.
approximately 20 minutes.
b.
Run the process fluid through the sensor until the sensor temperature reaches the normal
process operating temperature.
process operating temperature.
c.
Close the shutoff valve downstream from the sensor.
d. Ensure that the sensor is completely filled with fluid.
e.
Ensure that the process flow has completely stopped.