- Verify the power wiring and power supply.
- Verify the output wiring. The outputs must be powered externally.
- Verify the grounding.
- Verify cable shielding.
- Perform loop tests for each output.
- Check the sensor installation and orientation. Ensure that it is appropriate for
your application.
- Ensure that the installation meets temperature and/or pressure requirements.
• Check for active status alerts and follow the recommendations.
• If the device appears to be functioning correctly, but the process data is not
acceptable, review the symptoms and suggestions in the following sections:
- Density measurement problems (see Section 14.7)
- Temperature measurement problems (see Section 14.8)
- Gas measurement problems (see Section 14.9)
- Concentration measurement problems (see Section 14.10)
• If the device appears to be functioning correctly, but the control loop is not
performing as expected:
- Verify the output wiring.
- Ensure that all external devices are operational, are receiving data, and are
configured appropriately.
- Use sensor simulation to test boundary conditions and system response.
14.2
Check power supply wiring
If the power supply wiring is damaged or improperly connected, the transmitter may not
receive enough power to operate properly.
Prerequisites
You will need the installation manual for your transmitter.
Procedure
1. Use a voltmeter to test the voltage at the transmitter’s power supply terminals.
• If the voltage is within the specified range, you do not have a power supply
problem.
• If the voltage is low, ensure that the power supply is adequate at the source, the
power cable is sized correctly, there is no damage to the power cable, and an
appropriate fuse is installed.
• If there is no power, continue with this procedure.
2. Before inspecting the power supply wiring, disconnect the power source.
Troubleshooting
146 Micro Motion
®
Gas Specific Gravity Meters (SGM)
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