Table 16-6: Process variables problems and remedies
(continued)
Symptom Cause Suggested remedy
Unusually low density
reading
Slug flow Use standard procedures to check the quality
of the process fluid.
Incorrect K2 value Verify characterization. See Characterize the
meter (if required).
Unusually high tube frequency Sensor erosion Contact customer service.
Unusually low pickoff voltages Plugged fow tube, corrosion, or
erosion
Purge the flow tubes.
Unusually low pickoff voltages Several possible causes See Check the pickoff voltage.
Unusually high drive gain Several possible causes See Check the drive gain.
16.28 Check sensor-to-transmitter wiring
A number of power-supply and output problems may occur if the wiring between the sensor and the
transmitter is improperly connected, or if the wiring becomes damaged.
Be sure to check all wiring segments:
• If you have a 9-wire transmitter, check the wiring between the transmitter and the sensor junction box.
Prerequisites
You will need the installation manual for your transmitter.
Procedure
1. Before opening the wiring compartments, disconnect the power source.
WARNING
If the transmitter is in a hazardous area, wait five minutes after disconnecting the power. Failure to
do so could result in an explosion causing death or injury.
2. Verify that the transmitter is connected to the sensor according to the information provided in the
installation manual.
3. Ensure the lower puck is fully seated on the feed-through pins.
4. Verify that the wires are making good contact with the terminals.
5. Check the continuity of all wires from the transmitter to the sensor.
16.29 Using sensor simulation for troubleshooting
Display
Menu → Service Tools → Sensor Simulation
ProLink III Device Tools → Diagnostics → Testing → Sensor Simulation
When sensor simulation is enabled, the transmitter reports user-specified values for basic process variables.
This allows you to reproduce various process conditions or to test the system.
You can use sensor simulation to help distinguish between legitimate process noise and externally caused
variation. For example, consider a receiving device that reports an unexpectedly erratic density value. If sensor
simulation is enabled and the observed density value does not match the simulated value, the source of the
problem is likely to be somewhere between the transmitter and the receiving device.
You can enable sensor simulation using either the display or ProLink III software.
Troubleshooting Configuration and Use Manual
May2024 MS-00809-0200-1600
218 Emerson.com
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