Figure 4 – Detcon H2S RoughNECK User Manual
Page 6
5.1 Field Wiring Table
Maximum single conductor resistance between sensor and controller is 10 ohms. Maximum wire size for
termination in the sensor assembly terminal board is 14 gauge. Note the wiring table below.
AWG
Max Meters Max Feet
20
240
800
18
360
1200
16
600
2000
14
900
3000
Note:
This wiring table is based on stranded tinned copper wire and is designed to serve as a reference only.
6.0 P
OWER
U
P
Upon completion of all mechanical mounting and termination of all field wiring, apply 12 VDC system
power, turn on the power switch, and observe the following normal conditions:
a) The door mounted power lamp is on.
b) A temporary upscale reading will occur as the sensor heats up. This upscale reading will clear to "0"
ppm within 5-10 minutes of turn-on, assuming there is no gas in the area of the sensor. The upscale
reading may, momentarily, surpass alarm set points and fire the alarm horn and strobe.
Detcon RoughNECK™ H2S Gas Detection & Alarm System PG.6
B
C
B
C
BLU
YEL
BLK
WHT
Sensor 1
SENSORS
A = Blue
B = Yellow
C = Black
D = White
BOTTOM VIEW
A
B
A
Sensor 2
D
A
D
Power In
Figure 4