Procedure
1. Prepare the meter:
a) After applying power, allow the meter to warm up for at least 20 minutes.
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
meter.
2. 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. For
gas applications, lowering the Zero Time to five seconds is recommended.
3. Start the zero procedure and wait until it completes.
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 (especially when measuring gas flow), then retry.
• If the zero continues to fail, contact customer service.
• If you want to restore the most recent valid value from transmitter memory:
— Using the display: Menu → Service Tools → Verification and Calibration → Meter Zero → Restore Zero →
Restore Previous Zero
— Using ProLink III: Device Tools → Calibration → Smart Zero Verification and Calibration → Calibrate
Zero → Restore Prior Zero
— Using a field communicator: Not available
• If you want to restore the factory zero:
— Using the display: Menu → Service Tools → Verification and Calibration → Meter Zero → Restore Zero →
Restore Factory Zero
— Using ProLink III: Device Tools → Calibration → Smart Zero Verification and Calibration → Calibrate
Zero → Restore Factory Zero
— Using a field communicator: Device Settings → Calibration → Zero Calibration → Restore Factory Zero
Configuration and Use Manual Measurement support
MS-00809-0200-1600 May2024
Configuration and Use Manual 147
To Next Page
Loading...
