Prerequisites
Important
Do not verify the zero or zero the meter if a high-severity alert is active. Correct the problem, then verify the
zero or zero the meter. You may verify the zero or zero the meter if a low-severity alert is active.
Procedure
1. Prepare the meter:
a) Allow the meter to warm up for at least 20 minutes after applying power.
b) Run the process fluid through the sensor until the sensor temperature reaches the normal
process operating temperature.
c) Stop flow through the sensor by shutting the downstream valve, and then the upstream valve if
available.
d) Verify that the sensor is blocked in, that flow has stopped, and that the sensor is completely full
of process fluid.
2. Start the zero verification procedure, and wait until it completes.
3. If the zero verification procedure fails:
a) Confirm that the sensor is completely blocked in, that flow has stopped, and that the sensor is
completely full of process fluid.
b) Verify that the process fluid is not flashing or condensing, and that it does not contain particles
that can settle out.
c) Repeat the zero verification procedure.
d) If it fails again, zero the meter.
Postrequisites
Restore normal flow through the sensor by opening the valves.
Related information
Zero the meter
Configuration and Use Manual Quick start
MMI-20025166 March 2019
Configuration and Use Manual 17
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