AMC-SIR Refrigerant Gas Sensor/Transmitter
7
4.2 WIRING
The AMC-SIR Refrigerant Gas sensor/transmitter was designed to operate with a power supply
voltage range of 14V to 28VDC. It can be interconnected to a suitable Armstrong monitor panel
or be powered from a stable 14-28VDC power source, with its 4-20mA signal interconnected to
a suitable measuring device.
For best signal transmission and maximum noise rejection, it is recommended to run the three
conductor shielded installation cable through steel conduit (the cable shield must be chassis
grounded at the monitor or power supply).
4.2.1 MONITOR
AND
POWER SUPPLY WIRING
All field wiring connections for the AMC-SIR Refrigerant Gas sensor/transmitter are made via
TB2. Figure 4-2 shows the wiring layout of the AMC-SIR Refrigerant Gas sensor/transmitter.
CHG
LANDING POINT FOR CABLE SHIELD
RS-
RS+
V+
SigV
Ret
S
GND
INVERTED SIGNAL LINE FOR THE INTEGRATED RS485 INTERFACE
NON - INVERTED SIGNAL LINE FOR THE INTEGRATED RS485 INTERFACE
POWER SUPPLY CONNECTION 14 - 28VDC
SIGNAL OUTPUT CONFIGURED FOR 4-20mA
COMMON GROUND
1
TP3
TB2
TP1
V+
LED1
SigV
Ret
SIG
GND
S
V+
RS+
CHG
RS-
TO MONITOR
TP2
GND
POWER
J1
TB1
TO
TRANSMITTER
Figure 4-2 AMC-SIR Refrigerant Gas sensor/transmitter layout
4.2.1.1 THE ANALOG INTERFACE
The analog interface of the AMC-SIR Refrigerant Gas sensor/transmitter offers a linearized 4-
20mA analog current signal; proportional to the concentration of gas measured. This signal is
interpreted by the interconnected monitor.
Alternatively, the AMC-SIR Refrigerant Gas sensor/transmitter can also be used independently,
with its 4-20mA output connected to a suitable measuring device.
The standard configuration for output current is 4-20mA with the JP3 jumper installed.
(Condition as delivered) See Fig 4-3.