RKI Instruments 65-2340RKSS - Manual (Page 17)

65-2340RKSS Toxic Gas Transmitter • 13
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 4 on page 7. If controller leads or detector leads were
removed during this procedure, refer to Figure 4 on page 7 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 14 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 are minimal at calibration, then a calibration frequency of every 6 months is
adequate.
If an application is very demanding, for example if the environment is not well controlled
or if toxic gas is often present, then more frequent calibration than every 3 months may be
necessary.