RKI Instruments 65-2399RK-CH4 User Manual
Page 18
14 • 65-2399RK-CH4 Combustible Gas Transmitter
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.
CAUTION:
Allow the replacement detector to warm up for 5 minutes before you continue with
the next step.
12. Calibrate the transmitter as described in “Calibration” on page 15 of this manual.
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.
Place the new amplifier in the same position as the old amplifier. 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 new amplifier into the junction box with the screw, lock washer, and flat
washer you removed in Step 5 above.
9.
Install the detector and controller terminals strips into their sockets on the new
amplifier as shown in Figure 4 on page 7 of this manual. If controller leads or detector
leads were removed during this procedure, refer to Table 4 and Table 5 below.
Table 4:Reconnecting the Amplifier
to the Controller
Amplifier Controller
Terminal Strip
Controller
Transmitter Terminal
Strip (typical)
PWR/SIG “-”
- (DC -)
PWR/SIG “S”
S (4 - 20 mA In)
PWR/SIG “+”
+ 24V
Table 5:Reconnecting the CH
4
%Vol.
Detector to the Amplifier
Amplifier Detector
Terminal Strip
Detector Lead
DETECTOR “R”
RED