Emerson Rosemount FCL-01 Reference Manual page 83

Reference Manual
00809-0100-3412
Recommended actions
8.3.5 Sensor CPU (central processing unit) Error
This message means the sensor board software is corrupted.
Recommended actions
8.3.6 Sensor RTD Open
Alert
The chlorine and pH sensors used in the Rosemount FCL contain a Pt 100 RTD for
measuring temperature.
is open.
Recommended actions
Rosemount FCL 1056
1. Call the factory for assistance.
Emerson will ask for the main and sensor board revision numbers.
2. To read the main board revision, press DIAG and scroll down until
is showing.
Ver
3. To view the sensor board revision, press DIAG, choose the appropriate sensor,
and scroll down until
1. Cycle the power off and then on.
2. If cycling the power does not help, call the factory.
This means the sensor board must be replaced.
Sensor RTD Open
1. Confirm that the sensor RTD wires are properly connected.
2. Confirm that the Variopol connector is properly seated.
3. Disconnect the sensor from the cable and use an ohmmeter to check the
resistance across the RTD.
See Figure 8-1.
Figure 8-1: Pin out diagram for 498CL-01-VP Sensor (top view of connector
end of sensor)
Table 8-1: Pin-out diagram
Terminal number
1
2
3
is showing.
Board SW Ver
means the temperature measuring circuit
Description
Cathode
N/A
RTD sense
Troubleshooting
October 2023
Inst SW
83