
60
Using ProLink
®
Software with Micro Motion
®
Transmitters
View Menu: Status
continued
Critical indicators
Table 7-4. Nominal resistance and voltage ranges for flowmeter circuits
Notes
• Temperature sensor value increases 0.38675 ohms per
°
C increase in temperature.
• Nominal resistance values will vary 40% per 100
°
C. However, confirming an open coil or shorted coil is more important
than any slight deviation from the resistance values presented below.
• Resistance across terminals 6 and 8 (right pickoff) should be within 10% of resistance across terminals 5 and 9 (left
pickoff).
• Resistance values depend on the sensor model and date of manufacture.
Table 7-5. Troubleshooting faulty sensor cable
Circuit Wire colors Sensor terminals Normal resistance range Normal voltage
Drive coil Brown to red 1 to 2 8 to 2650 ~8.0 V
Left pickoff Green to white 5 to 9 15.9 to 300 3.4 mV/Hz
Right pickoff Blue to gray 6 to 8 15.9 to 300 3.4 mV/Hz
Temperature sensor Orange to violet 4 to 7 100
Ω
at 0
°
C + 0.38675
Ω
/
°
C not applicable
Lead length compensator Yellow to violet 4 to 7 100
Ω
at 0
°
C + 0.38675
Ω
/
°
C not applicable
Status indicators Resistance at transmitter terminals Cause Corrective action(s)
Sensor Failure
Input Overrange
• Open or short from green to white
• Open or short from blue to gray
Faulty cable Repair or replace sensor
cable
Sensor Failure
Drive Overrange
Open or short from red to brown
Sensor Failure
Temperature Overrange
• Open or short from violet to yellow
• Open or short from violet to orange
Sensor Failure
Input Overrange
Temperature Overrange
Drive Overrange
Resistance of any wire pair is outside
range listed in
Table 7-4
• Incorrect or faulty cable
connection
• Sensor failure
Reconnect sensor cable
according to installation
instructions
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