170
Reference Manual
00809-0300-4750, Rev CA
March 2016
9.5
Basic troubleshooting
When troubleshooting a magmeter, it is important to identify the issue.
below
provides common symptoms displayed by a magmeter that is not functioning properly.
This table provides potential causes and suggested corrective actions for each symptom.
Table 9-7. Common Magmeter Issues
Symptom
Potential cause
Corrective action
Output at 0 mA
•No power to transmitter
•Check power source and connections to the transmitter.
•Analog output improperly
configured
•Check the analog power switch position.
•Verify wiring and analog power.
•Electronics failure
•Verify transmitter operation with an 8714D Calibration
Standard or replace the electronic stack.
•Blown fuse
•Check the fuse and replace with an appropriately rated fuse, if
necessary.
Output at 4 mA
•Transmitter in multidrop mode
•Configure Poll Address to 0 to take transmitter out of multidrop
mode.
•Low Flow Cutoff set too high
•Configure Low Flow Cutoff to a lower setting or increase flow to
a value above the low flow cutoff.
•PZR Activated
•Open PZR switch at terminals 5 and 6 to deactivate the PZR.
•Flow is in reverse direction
•Enable Reverse Flow function.
•Shorted coil
•Coil check – perform sensor test.
•Empty pipe
•Fill pipe.
•Electronics failure
•Verify transmitter operation with an 8714D Calibration
Standard or replace the electronics stack.
Output will not
reach 20 mA
•Loop resistance is greater than
600 ohms
•Reduce loop resistance to less than 600 ohms.
•Perform analog loop test.
•Insufficient supply voltage to
analog output
•Verify analog output supply voltage.
•Perform analog loop test.
Output at 20.8
mA
•Transmitter not ranged properly
•Reset the transmitter range values – see
•Check tube size setting in transmitter and make sure it matches
the actual tube size – see
.
Summary of Contents for Rosemount 8750W
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