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Configuration and Use Manual 119
Troubleshooting
Operation AppendicesMaintenance and TroubleshootingCommissioning
Figure 10-1 Accessing the feedthrough pins
4. Using a digital multimeter (DMM), check the sensor internal resistances for each flowmeter
circuit. Table 10-7 defines the flowmeter circuits and the resistance range for each. Refer to
Figure 10-2 to identify the feedthrough pins. For each circuit, place the DMM leads on the pin
pairs and record the values.
Note: In order to access all feedthrough pins, you may need to remove the clamp and rotate the
transmitter to a different position.
In this test:
• There should be no open circuits, i.e., no infinite resistance readings.
• Nominal resistance values vary 40% per 100 °C. However, confirming an open or shorted
circuit is more important than any slight deviation from the resistance values shown here.
• The LPO and RPO circuit readings should be the same or very close (± 10%).
• The readings across pin pairs should be steady.
• Actual resistance values depend on the sensor model and date of manufacture. Contact
Micro Motion for more detailed data.
If a problem appears, or if any resistance is out of range, contact Micro Motion.
Feedthrough
Transmitter
User interface module
Sensor cable with
feedthrough connection
Transmitter housing cover
Transmitter
housing
Clamp
Feedthrough pins