Verify The Zero - Emerson Micro Motion 5700 Configuration And Use Manual

Quick start
June 2019

2.10 Verify the zero

Display Menu → Service Tools → Verification & Calibration → Meter Zero → Zero Verification
ProLink III Device Tools → Calibration → Smart Zero Verification and Calibration → Verify Zero
Field Communicator Service Tools → Maintenance → Calibration → Zero Calibration → Perform Zero Verify
Verifying the zero helps you determine if the stored zero value is appropriate to your installation, or if a field
zero can improve measurement accuracy.
Important
In most cases, the factory zero is more accurate than the field zero. Do not zero the meter unless one of the
following is true:
• The zero is required by site procedures.
• The stored zero value fails the zero verification procedure.
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.
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Configuration and Use Manual
Micro Motion 5700 Transmitters with Intrinsically Safe Outputs
MMI-20039472