Note
Only labeled and marked dial positions are used. The dial may turn to other
positions but will not provide meaningful outputs.
13. After successful verification:
a) Power down the transmitter.
b) Disconnect the Calibration Standard.
c) Power up the transmitter.
d) Return the transmitter to the original configuration parameters recorded in
Step 2.
e) Return the flow meter into service.
11.6.4
Auto zero trim
The auto zero procedure should be performed only under the following conditions:
• With the transmitter and sensor installed in their final positions. This procedure is not
applicable on the bench.
• With the sensor full of process fluid at zero flow.
These conditions should cause an output equivalent to zero flow.
Set the loop to manual if necessary and begin the auto zero procedure. The transmitter
completes the procedure automatically in about 90 seconds. A clock symbol will appear in
the lower right-hand corner of the display to indicate that the procedure is running.
Note
Failure to complete an auto zero may result in a flow velocity error of 5 to 10% at 1 ft/s (0.3
m/s). While the output level will be offset by the error, the repeatability will not be
affected.
11.6.5
Reset calibration status
LOI menu path Diagnostics → Status → Reset Cal Errs
Reset Calibration Status allows the user to clear the following calibration status bits
without restarting transmitter:
• Digital Trim Error
• Auto Zero Failure
• High Frequency Autozero Saturated
Maintenance Reference Manual
November 2019 00809-0100-8782
122 Rosemount
®
8782 Slurry Magnetic Flow Meter Transmitter with HART Protocol
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