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11.3.4 Zero the flowmeter using the Field Communicator
Zeroing the flowmeter establishes a baseline for process measurement by analyzing the
sensor's output when there is no flow through the sensor tubes.
1. Prepare the flowmeter:
a. Allow the flowmeter 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.
e. Observe the drive gain, temperature, and density readings. If they are stable,
check the Live Zero or Field Verification Zero value. If the average value is close to 0,
you should not need to zero the flowmeter.
2. Press Service Tools > Maintenance > Zero Calibration > Perform Auto Zero.
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. Press OK to start the zero, and wait while the zero calibration is performed.
5. When the zero is complete, data from the zero calibration is displayed.
• Press OK to accept the data and store the values.
• Press ABORT to discard the data and return to the previous zero values.
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 flowmeter to operation using a previous zero value:
- To restore the zero value set at the factory: Service Tools > Maintenance > Zero Calibration >
Restore Factory Zero . This function requires the enhanced core processor.
Restriction
Restore the factory zero only if your flowmeter was purchased as a unit, it was zeroed at the factory,
and you are using the original components.
Measurement support
Configuration and Use Manual 191