Detcon DM-700 - Manual (Page 14)

Model DM-700
DM-700 Instruction Manual Rev. 4.0 Page 10 of 48
Table 1 Wire Gauge vs. Distance
AWG Wire Dia. Meters Feet
Over-Current
Protection
22 0.723mm 700 2080 3A
20 0.812mm 1120 3350 5A
18 1.024mm 1750 5250 7A
16 1.291mm 2800 8400 10A
14 1.628mm 4480 13,440 20A
NOTE 1: Wiring table is based on stranded tinned copper wire and is designed to serve as a
reference only.
NOTE 2: Shielded cable is required for installations where cable trays or conduit runs include
high voltage lines or other possible sources of induced interference. Separate conduit runs are
highly recommended in these cases.
NOTE 3: The supply of power should be from an isolated source with over-current protection
as stipulated in table.
Terminal Connections
CAUTION: Do not apply System power to the sensor until all wiring is properly terminated. Refer to
Section 2.7 Initial Start Up
Customer
Supplied Wiring
(Out to next Device)
(+
)
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
(-)
A(+)
B(-)
(+)
mA
(-)
A(+)
B(-)
Customer
Supplied Wiring (In)
Modbus RS-485 to
Host Control Device
Power from and 4-20mA
out to Control Device
Install a 100-250 Ohm
resistor if the 4-20mA
output is not used
Modbus RS-485 to
next Device
Figure 10 Sensor Wire Connections
a) Remove the junction box cover. Identify the terminal blocks for customer wire connections.
b) Observing correct polarity, terminate the 3-conductor 4-20mA field wiring (+, -, mA) to the sensor
assembly wiring in accordance with the detail shown in Figure 10. If the 4-20mA output is not used,
install a 100-250Ω resistor between the mA and (-) terminals on the Transient Protection Module.