Detcon TP-624D - Manual (Page 35)

Model TP-624D
TP-624D Instruction Manual Rev. 0.4 Page 31 of 40
Replacement of Transmitter Module
a) Remove the junction box cover and remove the Transmitter Module from the Connector PCB.
NOTE: It is necessary to remove power to the Junction Box while changing the Transmitter
Module in order to maintain area classification.
b) Plug the new Transmitter Module into the connector PCB, and reinstall the junction box cover.
c) Perform Set Range, Set Heater Power, and Set AutoSpan Level then perform a successful AutoSpan before
placing sensor assembly into operation.
Replacement of the Connector PCB
NOTE: It is necessary to remove power to the Junction Box while changing the Transmitter
Module in order to maintain area classification.
a) Remove the junction box cover and remove the Transmitter Module from the Connector PCB.
b) Remove the black, white, blue, and yellow wires coming from the H
2
S Sensor from the connector PCB.
c) Remove the output wiring from the power, 4-20mA, RS-485 and relay connector PCB terminals.
d) Remove the two 6-32 screws holding the Connector PCB to the base of the junction box, and remove the
Connector PCB.
e) Install the new Connector PCB using the two 6-32 screws removed in step d.
f) Re-connect the output wiring from the power, 4-20mA, RS-485 and relay connector PCB terminals.
g) Reconnect the black, white, blue, and yellow wires from the H
2
S Sensor to the connector PCB.
h) Reinstall the Transmitter Module, and the junction box cover.