Detcon CXT-DM - Manual (Page 5)

Model CXT-DM
1. Introduction
1.1 Description
Detcon Compact Wireless Sensor Model CXT-DM toxic gas and O
2
deficiency sensors are non-intrusive
wireless sensors designed to detect and monitor a wide range of toxic gases in air. The unit is designed to
work as part of a wireless network of gas sensors and communication is performed via a built-in RF
transceiver. Ranges of detection for toxic gases are from 0-1ppm up to 0-10,000ppm; typical ranges of
detection are 0-10ppm, 0-25ppm, 0-50ppm and 0-100ppm. Ranges for O
2
deficiency are 0-1% up to 0-25%
by volume. The basic sensor assembly consists of an electrochemical sensor mounted in Intrinsically Safe
stainless steel housing and includes a Splash Guard Cal Adapter. Optionally, the sensor can be installed on an
explosion proof junction box with a choice of battery pack options making operation fully independent of
outside cabling. Other options are available, contact Detcon for more information.
Figure 1 Sensor Assembly with Optional J-Box and Smart Rechargeable Battery Pack
Electrochemical Sensor Technology
The Toxic gas sensors are based on electrochemical cells. Each cell consists of three electrodes embedded in
an electrolyte solution all housed beneath a diffusion membrane. Sensitivity to specific target gases is
achieved by varying composition of any combination of the sensor components. Good specificity is achieved
in each sensor type. The cells are diffusion limited via small capillary barriers resulting in a long service life
of up to three or more years. The electrochemical cell is packaged as a field replaceable plug-in sensor.
CXT-DM Instruction Manual Rev. 1.6 Page 1 of 52