Micro Motion CDM100M, Configuration And Use Manual

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b. Verify that the sensor is blocked in, that flow has stopped, and that the sensor is
completely full of process fluid.
c. Verify that the process fluid is not flashing or condensing, and that it does not
contain particles that can settle out.
d. Remove or reduce sources of electromechanical noise if appropriate.
2. Choose Device Tools > Calibration > Zero Velocity .
3. Modify
Zero Time
, if desired.
Zero Time controls the amount of time the transmitter takes to determine its zero-
flow reference point. The default Zero Time is 20 seconds. For most applications, the
default Zero Time is appropriate.
4. Click Calibrate Zero .
The
Calibration in Progress
message is displayed. When the calibration is complete:
• If the zero procedure was successful, a Calibration Success message and a new zero
value are displayed.
• If the zero procedure failed, a Calibration Failed message is displayed.
Postrequisites
Restore normal flow through the sensor by opening the valves.
Need help? If the zero fails:
• Remove or reduce sources of electromechanical noise, then retry.
• If the zero continues to fail, contact Micro Motion.
• If you want to return the meter to operation using a previous zero value, choose
Device Tools
>
Calibration > Zero Velocity > Restore Prior Zero . Restore Prior Zero is available only while the Zero
Velocity window is open. If you close the Zero Velocity window, you will no longer be able to
restore the prior zero.
2.4.3 Zero the meter using the Field Communicator
Zeroing the meter establishes a baseline for the velocity indicator by analyzing the sensor's
output when there is no flow through the sensor tubes.
Important
In most cases, the default value (0) is adequate for flow indication. Do not zero the meter unless the
velocity switch is being triggered incorrectly and you need to apply an offset to the velocity
measurement.
Prerequisites
Important
Do not zero the meter if a high-severity alert is active. Correct the problem, then zero the meter. You
may zero the meter if a low-severity alert is active.
Quick start
Configuration and Use Manual 11