65-2397RK CO
2
Transmitter • 17
12. Turn on the controller and place it into normal operation.
NOTE:
When first powered up, the transmitter will enter about a one minute period when the 4-20
mA output is stabilizing and may be above the controller alarm points or well below zero
momentarily. RKI controllers have a one minute warmup period when the controller does not
display any gas reading or give any alarm indication. The CO
2
transmitter’s 4-20 mA signal
should be stable by the time the controller’s warmup period is over.
CAUTION:
Allow the replacement detector to warm up for 5 minutes
before you continue with the
next step.
13. Calibrate the transmitter as described in “Calibration” on page 19 of this manual.
Replacing the Amplifier
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Remove the junction box cover.
4. Unplug the detector terminal strip and controller terminal strip from their sockets. You may leave
the wires connected to the terminal strips.
5. Unscrew and remove the screw with the flat and lock washers that secures the amplifier to the
junction box.
6. Remove the old amplifier.
7. Place the new amplifier in the same position as the old amplifier. A foam gasket that orients the
amplifier and keeps it from rotating is installed on the bottom of the amplifier. Make sure the
amplifier is seated flat in the junction box.
8. Install the new amplifier into the junction box with the screw, lock washer, and flat washer you
removed in Step 5 above.
9. Install the detector and controller terminal strips into their sockets on the new amplifier as shown
in Figure 4 on page 11 of this manual. If controller leads or detector leads were removed during
this procedure, refer to Table 4 and Table 5 below.
Table 4:Reconnecting the Amplifier to the Controller
Amplifier Controller
Terminal Strip
Controller
Transmitter Terminal
Strip (typical)
PWR/SIG “-”
- (DC -)
PWR/SIG “S”
S (4 - 20 mA In)
PWR/SIG “+”
+ 24V
