Emerson Rosemount FCL-01 Reference Manual page 84

Troubleshooting
October 2023
8.3.7 Sensor 1 Not Detected
The ribbon cable from sensor 1 (chlorine) board must be plugged into the sensor 1 plug.
See Figure 2-1
Recommended actions
8.3.8 Sensor Factory Data, Sensor Board User Data, and Sensor
EEPROM Write errors
These messages mean factory EEPROM data or user EEPROM data on the sensor board is
corrupted or the central processing unit (CPU) on the sensor board is bad.
Recommended actions
8.3.9 Sensor ADC error
There is a bad component on the sensor board.
84
Table 8-1: Pin-out diagram
Terminal number
4
5
6
At room temperature, it should be about 110 Ω.
If the resistance is very high, the RTD has failed, and the sensor must be
replaced.
4. If the resistance is okay, connect the Variopol cable to the sensor and
disconnect the three RTD wires at the transmitter. Measure the resistance
across the red and white RTD leads. Refer to
readings.
Table 8-2: Resistance
Wire 1
Red
Red
Red/White
If the resistance is very high, the problem is with the VP cable, and it must be
replaced.
for the location of the sensor board connectors.
1. Confirm that the ribbon cable connecting sensor 1 (chlorine) board to the main
board is plugged into the Sensor 1 connector on the main board.
2. Confirm that the ribbon cable is seated at both ends.
1. Cycle power off and then on.
2. Replace the sensor board.
(continued)
Description
Anode
RTD return
RTD in
Table 8-2
Wire 2
White
Red/White
White
Reference Manual
00809-0100-3412
for expected resistance
Approximate resistance
110 Ohms
110 Ohms
0 Ohms
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