place it on the NC and center pins. The pin groups
are identified as follows:
J2 – High Alarm
J3 – Auxiliary Alarm
J4 – Low Alarm
J5 – Fault
The controller is programmed at the factory for nor-
mally open relay contacts.
Latching/Non-Latching Relays
The Low and Auxiliary alarm relays are programmable
for latching or non-latching operation. The High alarm
relay is always latching. Latching relay operation is
programmed using rocker switch 1 at SW1 (SW1-1).
For latching operation, place the switch in the closed
position. For non-latching operation, place it in the
open position. This switch is set at the factory for
non-latching relay operation.
Normally Energized/De-Energized Relays
The three alarm relays are also programmable for nor-
mally energized (fail-safe) or normally de-energized
operation. This is accomplished by setting rocker
switch 2 at SW1 (SW1-2). For normally energized
alarm relays, place the switch in the closed position.
For normally de-energized operation, place it in the
open position. This switch is set at the factory for nor-
mally de-energized operation.
The Fault relay is always normally energized, regard-
less of the setting of SW1-2.
4 to 20 ma Output
Isolated or non-isolated operation of the 4 to 20 ma
output can be selected using a jumper plug at J1.
For non-isolated operation, as illustrated in Figure 10,
place the jumper plug in the INT (internal power
source) position. Place the plug in the EXT position
for an isolated circuit, as illustrated in Figure 11. The
jumper is set at the factory for non-isolated operation.
INSTALLATION CHECKLIST
The following checklist is provided as a means of
double checking the system to be sure that all phases
of system installation are complete and have been
performed correctly.
1. Sensors are pointing down and junction boxes
are securely mounted.
2. Optional sensor accessories (dust/splash guards,
sample draw devices, etc.) are installed, clean,
and in good condition.
3. If a sensor separation kit is used, interconnecting
wiring is correct and shorting plug is installed.
4. All cable shields are properly grounded.
5. Conduit seals have been installed at all junction
box entries (if conduit is being used).
6. All transmitter modules are properly installed in
their junction boxes.
7. All junction box covers are tightly installed.
8. Transmitter to controller wiring is correct.
9. Power wiring to the controller is installed and
power source is operational.
10. External loads are properly connected to the con-
troller.
11. Controller is programmed as desired. Record this
information for future reference.
12. Controllers are properly installed in the mounting
enclosure.
13. Proper ventilation is provided to prevent over-
heating of the controller.
Proceed to System Startup, Setpoint Adjustment and
Calibration.
Section III
System Startup
STARTUP PROCEDURE
1. Output loads that are normally actuated by the
gas detection system should be secured (remove
power from all output devices) to prevent unde-
sired activation.
2. Check all external wiring for proper connection.
Be sure that the sensor has been connected
properly and that the transmitter module has been
installed properly.
3. Before installing the controller in the mounting
rack, inspect it to verify that it has not been physi-
cally damaged in shipment. Check the jumper
plugs and rocker switches on the controller for
proper programming, then slide the controller fully
into the mounting enclosure.
4. Apply power to the system.
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