35-3001A-10 Oxygen/Carbon Monoxide Sample-Draw Detector • 21
8. Secure the CO amplifier on the flow block with the two screws you removed in step 4.
9. Close and latch the housing door.
10. Turn on power to the controller.
11. Turn on the controller.
CAUTION:
Allow the replacement sensor to warm up for 5 minutes before you continue.
12. Calibrate the replacement sensor as described on page 27.
Replacing the Oxygen Amplifier
1. Turn off the controller.
2. Turn off power to the controller.
3. Open the housing door of the sample-draw detector.
4. Remove the detector and controller plug-in terminal strips by grasping the sides of the strips with
your fingers. Let the terminal strips hang by their connected wires while you replace the amplifier.
5. Unscrew the screw in the lower left corner of the amplifier and remove the screw, lock washer, and
flat washer. Be careful not to lose any of these parts.
6. Remove the old amplifier from the main circuit board.
7. Install the new amplifier in the same orientation as the old amplifier. See Figure 1.
8. Reinstall the screw, lock washer, and flat washer you removed in step 5.
9. Install the detector and controller plug-in terminals strips into their sockets on the new amplifier. If
controller leads or detector cable leads were removed from the plug-in terminal strips during this
procedure, refer to Table 2 and Table 3 below.
Table 2: Reconnecting the Amplifier to the Amp 1 Terminals
on the Detector/Amp Terminal Strip
Amplifier Controller
Terminal Strip
Detector/Amp
Terminal Strip on
Main PCB
SIG/PWR “S”
AMP 1 “S”
SIG/PWR “+”
AMP 1 “+”
Table 3: Reconnecting the Amplifier to the Oxy Terminals
on the Detector/Amp Terminal Strip
Amplifier Detector
Terminal Strip
Detector/Amp
Terminal Strip on
Main PCB
OXY “+”
OXY “+”
OXY “-”
OXY “-”
