RKI Instruments 65-2484RK-06 User Manual
Page 22
18 • 65-2484RK-06 Multi Point Detector
SO
2
Detector
This section includes a procedure to replace the SO
2
sensor and one to replace the entire
detector assembly. In most cases it is not necessary to replace the entire detector assembly.
Replacing the Plug-In SO
2
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.
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 an SO
2
sensor, you must replace it with an SO
2
sensor.
6.
Make sure the cap gasket is in place and screw the detector housing cap with the
splashguard back onto the detector housing body.
7.
Turn on power to the controller.
8.
Turn on the controller.
CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the
next step.
9.
Calibrate the detector as described in “Calibration, SO
2
Detector” on page 23.
Replacing the SO
2
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 from the junction box.
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.
5.
Unscrew the detector from the junction box conduit hub.
6.
Guide the detector leads of the replacement detector through the controller conduit
hub or junction box conduit hub, then screw the mounting threads of the detector into
the hub. If necessary for environmental conditions, apply thread sealant or teflon tape
to the hub and/or detector threads to seal them.