14 • 65-2424RK H
2
S Transmitter
Replacing the Amplifier PCB
1. Turn off the controller.
2. Turn off or unplug incoming power at the power source end.
3. Remove the enclosure’s cover by unscrewing the four cover screws, one at each corner.
4. Disconnect the wires from the interconnect terminal strip.
5. Unplug the H
2
S sensor from the amplifier PCB to access one of the PCB mounting
screws.
6. Unscrew and remove the two screws that secure the amplifier PCB to the enclosure.
The screws are near the top and bottom of the amplifier PCB.
7. Remove the amplifier PCB.
8. Place the new amplifier PCB in the same position as the one you removed in step 6.
9. Use the two screws you removed in step 5 to secure the PCB to the enclosure.
10. Reconnect the wiring from the controller to the interconnect terminal strip as shown in
Table 2 and Figure 3.
11. Carefully plug the H
2
S sensor with rubber boot and charcoal filter into the socket pattern
on the amplifier PCB.
NOTE:
Match the sensor’s male pins with the four female sockets as you plug the sensor into
the sockets.
12. Secure the cover to the enclosure.
13. Turn on or plug in incoming power at the power source end.
14. Turn on the controller.
CAUTION:
Allow the sensor to warm up for 5 minutes
before you continue with the next step.
15. Calibrate the H
2
S transmitter as described in the Calibration section of this insert.
Table 2: Reconnecting the
H
2
S Transmitter to a Controller
Amplifier PCB Interconnect
Terminal Strip
Controller
Transmitter Terminal
Strip (typical)
FB
4 - 20 (FB)
+V
+ V (10 VDC - 30 VDC)
