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2. Choose Device Tools > Calibration > Zero Verification and Calibration.
3. Click Calibrate Zero.
4. 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.
5. 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:
• 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: Device Tools > Zero Verification and Calibration >
Calibrate Zero > Restore Factory Zero . This function requires the enhanced core processor.
- To restore the most recent valid value from transmitter memory: Device Tools > Zero
Verification and Calibration > Calibrate Zero > Restore Prior Zero . Restore Prior Zero is available only
while the Flow Calibration window is open. If you close the Flow Calibration window, you
will no longer be able to restore the prior zero.
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.
9.3.5 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.
Measurement support
Configuration and Use Manual 157