RKI Instruments 65-2399RK-CH4 User Manual
Page 16
12 • 65-2399RK-CH4 Combustible Gas Transmitter
Replacing Components of the Methane Transmitter
This section includes a procedure to replace the hydrophobic membrane, a procedure to
replace the plug-in IR CH
4
%Vol. sensor, a procedure to replace the entire methane
detector assembly, and one to replace the amplifier. In most cases, it is not necessary to
replace the entire detector assembly.
Replacing the Hydrophobic Membrane
1.
Turn off the controller.
2.
Turn off or unplug incoming power to the controller.
3.
Unscrew the detector housing cap from the detector housing body.
4.
Gently pry up the edge of the white hydrophobic membrane with a small flat blade
screwdriver or a similar tool.
5.
Peel off the hydrophobic membrane. It may be necessary to clean off the detector
housing cap face to remove any residue left from the adhesive backed membrane.
6.
Install the new membrane in the recess on the face of the detector housing cap.
7.
Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
8.
Turn on the power to the controller.
9.
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 methane transmitter’s 4-20 mA signal should be stable by
the time the controller’s warmup period is over.
Replacing the Plug-In IR CH
4
%Volume Sensor
1.
Turn off the controller.
2.
Turn off or unplug power to the controller.
3.
Unscrew the detector housing cap from the detector housing body. Make sure not to
lose the cap gasket.
4.
Unplug and remove the plug-in IR CH
4
%Volume sensor.
5.
Carefully plug the replacement sensor into the socket pattern that is located in the
detector housing.
6.
Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
7.
Turn on power to the controller.
8.
Turn on the controller and place it into normal operation.