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. Start the zero process.
a. Navigate to the Zero menu: OFFLINE MAINT > OFFLINE CALIB > VEL ZERO.
b. Scroll to CAL VEL/ZERO and activate Select, then select CAL/YES?.
The status LED changes to flashing yellow while the zero is in progress.
3. Read the zero result on the display.
The display reports CAL PASS if the zero was successful, or CAL FAIL if it was not.
Postrequisites
Restore normal flow through the sensor by opening the valves.
Need help? If the zero fails:
• Ensure that there is no flow through the sensor, then retry.
• Remove or reduce sources of electromechanical noise, then retry.
• Set Zero Time to a lower value, 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 OFFLINE
MAINT > CAL > RESTORE VEL/ZERO.
2.4.2 Zero the meter using ProLink III
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.
Procedure
1. Prepare the meter:
a. Stop flow through the sensor by shutting the downstream valve, and then the
upstream valve if available.
Quick start
10 Micro Motion
®
Compact Density Meters (CDM)
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