Detcon CX-DM - Manual (Page 13)

Model CX-DM
B
A
mA
V-
V+
Black R
ed
Gr
ee
n
B
lue
W
hi
te
W
hi
te
B
lue
Gr
ee
n
R
ed
Black
To Sensor
Customer
Wiring
Ferrite
Bead
Figure 9 Terminal Interconnect
NOTE
A 6-32 or 8-32 threaded exterior ground point is provided on most junction boxes for an
external ground. If the sensor assembly is not mechanically grounded, an external ground
strap must be used to ensure that the sensor is electrically grounded.
2.7 Initial Start Up
Toxic Gas Sensors
Upon completion of all mechanical mounting, apply power to the sensor. Observe the following normal
conditions:
1. Upon power up, the sensor will scroll "CX-DM V##.##" and will then display the current reading for
about 5 seconds. A temporary upscale reading may occur as the sensor stabilizes. This upscale reading
will decrease to "0" ppm within 1 to 2 minutes of power-up, assuming there is no gas in the area of the
sensor. Sensors cells that use a bias voltage require a longer time to stabilize. This can vary between 1
and 24 hours depending on the sensor type and range. Biased sensors include NH
3
, NO, HCl, and
VOC gases (ethylene oxide, ethylene, methanol, formaldehyde….etc.).
2. After the initial power up, the sensor display will turn off. Thereafter the display will come on once
every 10 seconds, display the current reading for 2 seconds, and then return to a blank display.
Initial Operational Tests
After a warm up period of 1 hour (or when zero has stabilized), verify that the sensor has sensitivity to the
target gas.
CX-DM Instruction Manual Rev. 1.3 Page 9 of 40