11.3.6 Sensor RTD open
There is an open circuit in the sensor RTD (resistance temperature device) or wiring.
1. If the sensor is being installed for the first time, check the wiring connections.
See Section 4.3.
2. Disconnect the sensor from the transmitter and measure the resistance between
the RTD and return wires.
See Figure 4-4 or Figure 4-5.
3. If there is an open circuit, replace the sensor.
4. If there is no open circuit, check the transmitter.
See Section 11.5.
11.3.7 Sensor 1 Not Detected
The ribbon cable from sensor 1 (chlorine) board must be plugged into the sensor 1 plug.
See Figure 4-3 for the location of the sensor board connectors.
Procedure
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.
11.3.8 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 CPU on the sensor board is bad.
1. Cycle power off and then on.
2. Replace the sensor board.
11.3.9 Sensor ADC error
There is a bad component on the sensor board. The sensor board must be replaced.
11.3.10 Sensor RTD Out of Range
The 499ACL-02 chlorine sensor contains a Pt 100 RTD (resistance temperature device) for
measuring temperature. If the measured resistance is outside the expected range, the
transmitter displays the out of range error message.
1.
Check wiring connections.
2. Disconnect the sensor from the transmitter and use an ohmeter to check the
resistance across the RTD.
Troubleshooting
88 Rosemount TCL
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