Emerson Micro Motion 2700 Configuration And Use Manual page 212

Troubleshooting
5.
6.
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Table 10-7: Coils and test terminal pairs
Coil
Resistance temperature detector
(RTD)
Lead length compensator (LLC)
Composite RTD
Fixed resistor (see note)
Note
The F300/H300/CMF400 fixed resistor applies to only certain specific sensor releases. Contact
customer support for more information.
There should be no open circuits, that is, no infinite resistance readings. The left
pickoff and right pickoff readings should be the same or very close (±5 Ω). If there
are any unusual readings, repeat the coil resistance tests at the sensor junction box
to eliminate the possibility of faulty cable. The readings for each coil pair should
match at both ends.
Test the terminals in the sensor junction box for shorts to case.
Test results will be inconclusive with nonconductive process fluids such as
hydrocarbons.
a. Leave the terminal blocks disconnected.
b. Remove the lid of the junction box.
c. Testing one terminal at a time, place a DMM lead on the terminal and the other
lead on the sensor case.
With the DMM set to its highest range, there should be infinite resistance on
each lead. If there is any resistance at all, there is a short to case.
Test the resistance of junction box terminal pairs.
a. Test the brown terminal against all other terminals except the red one.
b. Test the red terminal against all other terminals except the brown one.
c. Test the green terminal against all other terminals except the white one.
d. Test the white terminal against all other terminals except the green one.
e. Test the blue terminal against all other terminals except the gray one.
f. Test the gray terminal against all other terminals except the blue one.
g. Test the orange terminal against all other terminals except the yellow and violet
ones.
Micro Motion Model 2700 Transmitters with Intrinsically Safe Outputs
(continued)
Sensor model
All
All except T-Series and CMF400
(see note)
All CMFSs, T-Series, H300, and
F300
CMFS007, CMFS010, CMFS015,
CMF400, and F300
Terminal colors
Yellow to violet
Yellow to orange
Yellow to orange
Yellow to orange