Manning GM-JR-F Gas Monitoring Alarm System 19186 GMJRF 10/2006 REVC Copyright © 2006 Honeywell Analytics. All Rights Reserved. 9
3
Operation
ADisplay Panel
A 20-segment Bargraph Display indicates the gas
concentration level. The bottom LED is always lit to
indicate power to the display.
The bottom LED will flash during the one-minute power
up delay, indicating that the relay is held in the normal
condition to allow for sensor stabilization upon power
up.
When flashing, the Alarm LED indicates the alarm level,
as determined by the alarm setpoint, has been
exceeded. An alarm condition will trip the relay after a
10 second time delay.
The Fault LED indicates a signal input of less than
1.4 mA. A fault condition will also trip the relay after a
10 second time delay.
BSignal and Setpoints
The voltage between TP1 and TP2 indicates the current
signal received from the sensor. The normal range is
40 mV to 200 mV, which corresponds with 4 mA to
20 mA (see Figure 3, Note 1).
The setpoint can be adjusted from 10% to 100% full
scale in 5% increments using the shorting tab and
jumper block on the back of the display circuit board as
shown in Figure 3, Note 2. If the shorting tab is not
installed, the unit will go into alarm.
After setpoint adjustment, always expose sensor to
the gas being monitored and verify that the alarm
light triggers at the desired concentration as
displayed by the bargraph.
CStart-Up Procedures
Before applying power, make a final check of all
wiring for continuity, shorts, grounds, etc. It is usually
best to disconnect external alarms and other
equipment from the unit until the initial start-up
procedures are completed.
After power-up, allow 24 hours for the system
to stabilize before testing the sensor. Because
sensors are normally located at a distance from the
monitoring unit, the test time required and accuracy of
the response checks will be improved if two people
perform the start-up procedures and use radio contact.
Start-Up Test: One person exposes the sensor to a
small amount of the gas that is being monitored. The
second person stays at the monitoring unit to determine
that the sensor, when exposed to the gas fumes, is
connected to the proper input, responds, and causes
appropriate alarm functions.
Figure 3: Setpoint adjustment and signal reading on the Manning GM-JR
SHLD GND +24 SIG
SHLD GND +24 SIG
TO SENSOR
TO CONTROL UNIT
JR-BACK
+24
SIG IN
SIG OUT
GND
+24
SIG IN
SIG OUT
GND
100%
95%
90%
85%
80%
75%
70%
65%
60%
55%
50%
45%
40%
35%
30%
25%
20%
15%
10%
SETPOINT
BOT
TOP
SIG
TB1
GND
NC COM NO
J1
TP2
F1
D1
SIGNAL TEST
40-200 mVDC
TP1
JP2
JP1
JP3
40-200 mV
Black
-Red
+
mVDC
Relay output 0.5 amp at
24 VDC or 24 VAC Max
or 0.25 amp at 120 VAC
Note 2: Setpoint adjustment
using shorting tab
Note 1: Reading signal from sensor
Note: If the GM-JR is mounted in the
sensor enclosure, the display board
will be connected directly into the
sensor pre-amp. See sensor manual
for instructions on reading the signal.
Risk of electrical shock.
