RKI Instruments 65-2405RK-04 - Manual (Page 19)

65-2405RK-04 Combustible Gas Transmitter • 15
amplifier as shown in Figure 4 on page 9 of this manual. If controller leads or detector
leads were removed during this procedure, refer to Table 3 and Table 4 below.
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.
10. Turn on power to the controller.
11. 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 combustible gas transmitter’s 4-20 mA signal should be
stable by the time the controller’s warmup period is over.
12. Allow the transmitter to warm-up for 5 minutes.
13. Calibrate the transmitter as described in “Calibration” on page 17 of this manual.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 to 6 months is adequate for most combustible gas
transmitter applications. Unless experience in a particular application dictates otherwise,
RKI Instruments, Inc. recommends a calibration frequency of every 3 months.
Table 3: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 4:Reconnecting the LEL
Detector to the Amplifier
Amplifier Detector
Terminal Strip
Detector Lead
DETECTOR “R” RED
DETECTOR “W” WHT
DETECTOR “G” GREEN
DETECTOR “B” BLK