Detcon X40-32-N7 - Manual (Page 35)

Model X40
Model X40 Instruction Manual Rev. 3.3 Page 29 of 64
3.2 Analog 4-20mA Sensor Inputs (DA-4)
Connect the 4-20mA gas sensors to DA-4 4-20mA input modules. The DA-4 modules provide power to
any 2-wire or 3-wire field sensors, and receive standard 4-20mA signal inputs from the sensors Figure 29.
NOTE
The terminals on the DA-4 module are rated for a maximum of 30VDC. They are designed
to accept solid or stranded wire between 12AWG and 24AWG.
NOTE
Analog sensors used with the X40 must supply 4mA for a zero reading and 20mA for a full
scale reading. The sensors current output should be linear for readings between zero and full
scale. Sensors that do not meet this requirement must not be used with the X40.
NOTE
External devices attached to the equipment must require a tool to access their wiring
terminals to prevent unauthorized access.
NOTE
Hazardous live voltages of external devices attached to the DA4 must be isolated or
disconnected prior to accessing the terminals of the external devices
NOTE
All cable penetrations for analog sensor cables must be made in the bottom of the enclosure
(See Figure 13). All penetrations must use a NEMA4 rated cable gland (Appleton P/N CG-
2575 or equivalent) to prevent water ingress and restrict access to the internal circuits of the
X40.
4-20mA
INPUT
COMM
M
S
D
L
S
D
2-Wire 4-20mA Sensor
mA
_
+
+ _ mA
3-Wire 4-20mA Sensor
Sensor 4
Sensor 3
Sensor 1
Sensor 2
mA
_
+
+ _ mA
Figure 29 Model DA-4 4-20mA Input Module and 4-20mA Gas Sensor Connections
There are four 4-20mA inputs with each DA-4 module to support up to four sensors (See Figure 30). DA-4
modules can be installed on the DIN rail of the controller.