70-PHW-1025 R0.6 023-037X MT-IR Refrigerant Leak Detector spec & Install.doc
6
SENSOR WIRING
Wire sensors according to diagram
Figure 6
The sensor can be powered
directly from the MT-500
board.
Don’t power more than one
sensor per MT500 board.
The 255 ohms resistor R should
be placed at the MT-500 input
terminal block.
Figure 7
RELAY OPTION
When relay output is needed use an external power supply 400-0002 set to 24VDC with a dual relay
sequencer 023-0386. Wire according to Figure 7. This configuration allows the IR sensor to be use
as stand alone or with the MT-500 sensor node. The 255 ohms resistor R should be placed at the
relay sequencer input terminal block. Do not connect the (–) wire of the 24VDC to the relay
sequencer. This will prevent ground loop to affect signal accuracy. Default relay threshold settings
are 500ppm and 1000ppm. Different setting is available on special order. Relay and power supply
should be installed in a control panel.
24Vac
20va
Transformer
24Vac in
DC output
Set to 24V
023-0386
400-0002
560-0027
023-037X, 0380
MT-IR gas sensor
RLY1
500ppm
RLY2
1000ppm
R
023-037X R-XYZ
Install date
Calib date
4
3
2
1
+
-
+
-
A
C
-
+
OPTIONAL
Sensor node
MT-500
Stand alone or monitoring with relay application
Power
Signal
GND
GND
+15V
+15V
Analog U
inputs
Red
Black
Yellow
Green
Not conn
023-037X, 0380
MT-IR gas sensor
023-037X R-XYZ
Install date
Calib date
4
3
2
1
Sensor node
MT-500
Monitoring application
GND
GND
+15V
+15V
Analog U
inputs
R
Black
Yellow
Red
P6
