12 • 65-2301RKSS Toxic Detector
4.
If the calibration/response difficulties continue, replace the plug-in sensor as described later in
this section.
5.
If the calibration/response difficulties continue, contact RKI Instruments, Inc. for further
instruction.
Replacing Components of the Toxic Detector
This section includes a procedure to replace the plug-in toxic sensor and one to replace the entire toxic
detector assembly. In most cases, it is not necessary to replace the entire detector assembly.
Replacing The Plug-in Toxic Sensor
CAUTION: The plug-in sensor contains electrolyte which is a dilute acid. Do not disassemble the sensor when
replacing it with a new one. If sensor electrolyte comes in contact with your skin, wash affected
area thoroughly with soap and water.
1.
Turn off the controller.
2.
Turn off or unplug power to the controller.
3.
Unscrew the detector housing cap with the splashguard from the detector housing body. Make
sure not to lose the cap gasket.
4.
Unplug and remove the toxic sensor.
5.
Remove the black plug from the top of the replacement sensor.
6.
Carefully plug the replacement sensor into the connector that is located in the detector housing
body.
WARNING: You must replace the plug-in sensor with the same type of sensor that is installed. A
detector cannot be converted from one type of detector to another by using a different
plug-in sensor. For example, if you are replacing a Cl
2
sensor, you must replace it with a
Cl
2
sensor.
7.
Make sure the cap gasket is in place and screw the detector housing cap with the splashguard back
onto the detector housing body.
8.
Turn on power to the controller.
9.
Turn on the controller.
CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the next step.
10. Calibrate the detector as described in “Calibration” on page 14.
Replacing the Toxic Detector
NOTE:
In most cases, it is only necessary to replace the plug-in sensor.
1.
Turn off the controller.
2.
Turn off or unplug incoming power to the controller.
3.
Remove the junction box cover.
4.
Disconnect the detector leads from the terminal block in the junction box. Note the position of the
color-coded leads as you remove them.
