Detcon IR-700 - Manual (Page 13)

Model IR-700
IR-700 Instruction Manual Rev. 3.1 Page 9 of 40
NOTE: The Detcon Warranty does not cover water damage resulting from water leaking into
the enclosure. However, since the electronics are 100% epoxy encapsulated, only the wire
terminations could get wet. Moisture could cause abnormal operation and possibly corrosion
to the terminal connections, but permanent damage to the sensor would not be expected.
Plug any unused
ports
Explosion Proof
Housing
(J-Box) Drain
IR-700
Sensor
Assembly
Conduit
"T" EYS Seal Fitting
MODEL
IR-700
detcon inc.
LEL Sensor
(+
)
m
A
(-
)
A
(+
)
B
(-
)
Wiring to
Sensor Assembly
W
h
t
B
lu
R
e
d
G
rn
B
lk
Explosion
Proof
Junction Box
(+)
mA
(-)
N/U
A(+)
B(-)
Customer
Supplied Wiring
Transient Protection Module
(TPM) P/N 500-003087-100
Mount TPM in Explosion
Proof Enclosure to ground
unit properly. Mount to
bottom of enclosure using
6-32 screws.
6-Pin Pheonix Plug
P/N 306-175705-100
Figure 10 Typical Installation
NOTE: Any unused ports should be blocked with suitable ¾” male NPT plugs. Detcon
Supplies one ¾” NPT male plug with their accessory J-box enclosures. If connections are
other than ¾” NPT, use an appropriate male plug of like construction material.
2.6 Field Wiring
Detcon Model IR-700 combustible hydrocarbon gas sensor assemblies require three conductor connections
between power supplies and host electronic controller’s 4-20mA output, and 2 conductor connections for the
Modbus™ RS-485 serial interface.
Wiring designations are + (DC), – (DC), mA (sensor signal), and
Modbus™ RS-485 A (+), and B (-). Maximum wire length between sensor and 24VDC source is shown in the
Table below. Maximum wire size for termination in the Detcon J-Box accessory is 14AWG.
Table 1Wire Gauge vs. Distance
AWG Wire Dia. Meters Feet
Over-Current
Protection
22 0.723mm 700 2080 3A
20 0.812mm 1120 3350 5A