158 Micro Motion Series 1000 and Series 2000 Transmitters
Troubleshooting
8. Test terminal pairs as follows:
a. Brown against all other terminals except Red
b. Red against all other terminals except Brown
c. Green against all other terminals except White
d. White against all other terminals except Green
e. Blue against all other terminals except Gray
f. Gray against all other terminals except Blue
g. Orange against all other terminals except Yellow and Violet
h. Yellow against all other terminals except Orange and Violet
i. Violet against all other terminals except Yellow and Orange
Note: D600 sensors and CMF400 sensors with booster amplifiers have different terminal pairs.
Contact Micro Motion for assistance (see Section 12.3).
There should be infinite resistance for each pair. If there is any resistance at all, there is a short
between terminals.
9. See Table 12-14 for possible causes and solutions.
10. If the problem is not resolved, contact Micro Motion (see Section 12.3).
11. To return to normal operation:
a. Plug the terminal blocks into the terminal board.
b. Replace the end-cap on the core processor housing.
c. Replace the lid on the sensor junction box.
Note: When reassembling the meter components, be sure to grease all O-rings.
12.27.2 4-wire remote or integral installation
If you have a 4-wire remote installation or an integral installation (see Section 1.3 and refer to
Appendix B for diagrams):
1. Power down the transmitter.
2. If the transmitter is in a hazardous environment, wait five minutes.
3. If you have a 4-wire remote installation, remove the core processor lid.
Table 12-14 Sensor and cable short to case possible causes and remedies
Possible cause Solution
Moisture inside the sensor junction box Make sure that the junction box is dry and no corrosion is present.
Liquid or moisture inside the sensor case Contact Micro Motion. See Section 12.3.
Internally shorted feedthrough (sealed passage
for wiring from sensor to sensor junction box)
Contact Micro Motion. See Section 12.3.
Faulty cable Replace cable.
Improper wire termination Verify wire terminations inside sensor junction box. See Micro
Motion’s 9-Wire Flowmeter Cable Preparation and Installation Guide
or the sensor documentation.
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