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• Set Zero Time to a lower value, then retry.
• If the zero continues to fail, contact Micro Motion.
Tip
You can restore the factory zero using a communications tool such as ProLink II. 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. This function requires the enhanced core processor.
9.3.2 Zero the flowmeter using ProLink II
Zeroing the flowmeter establishes a baseline for process measurement by analyzing the
sensor's output when there is no flow through the sensor tubes.
Prerequisites
ProLink II must be running and must be connected to the transmitter.
Procedure
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. Choose ProLink > 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 Perform Auto Zero.
The Calibration in Progress light will turn red during the zero procedure. At the end of
the procedure:
• If the zero procedure was successful, the Calibration in Progress light returns to
green and a new zero value is displayed.
• If the zero procedure failed, the Calibration Failure light turns red.
Measurement support
124 Micro Motion
®
Model 1500 Transmitters with Analog Outputs