65-2340RK Toxic Gas Transmitter • 17
CAUTION:
Allow the replacement detector to warm up for 5 minutes
before you continue
with the next step.
12. Calibrate the replacement detector as described in “Calibration” on page 18.
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. Install the new amplifier into the junction box with the screw, lock washer, and flat washer
you removed in Step 5 above. 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 detector and controller terminal strips into their sockets on the new amplifier as
shown in Figure 5 on page 12. If controller leads or detector leads were removed during
this procedure, refer to Figure 5 on page 12 for the detector and amplifier connections.
NOTE:
When a transmitter is first powered up with a new amplifier, the initial output may be
either high or below zero depending on the setting of the zero pot. Be sure to make
arrangements so that this does not cause unwanted alarms.
9. Turn on power to the controller.
10. Turn on the controller and place it into normal operation.
11. Allow the transmitter to warm-up for 5 minutes.
12. Calibrate the transmitter as described in “Calibration” on page 18 of this manual.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 months is adequate for most toxic gas transmitter
applications. Unless experience in a particular application dictates otherwise, RKI
Instruments, Inc. recommends a calibration frequency of every 3 months for the toxic gas
transmitter.
If an application is not very demanding, for example detection in a clean, temperature
controlled environment where toxic gas is not normally present, and calibration adjustments
