Detcon CX-DM - Manual (Page 6)

Model CX-DM
1.2 Modular Design
The CX-DM sensor assembly is completely modular and is composed of four parts (Figure 3).
1. CX-DM Intelligent Transmitter Module (ITM)
2. Plug-in Electrochemical Sensor (varies by gas type and range)
3. CX Series Bottom Housing
4. Splash Guard
CX-DM Bottom
Housing Assembly
Plug-in Replaceable
Sensor
Intelligent Transmitter Module (ITM)
Micro-processor controlled circuit
encapsulated in an Explosion proof
housing.
Magnetic
Programming Switches
Splash Guard
3
4
" NPT Locking
Nut
Figure 3 Sensor Assembly Breakaway
NOTE
All metal components are constructed from electro polished 316 Stainless Steel to
maximize corrosion resistance in harsh environments.
CX-DM Intelligent Transmitter Module
The transmitter module is microprocessor-based and attached to the explosion proof junction box. Circuit
functions include an intrinsically safe barrier, on-board power supply, microprocessor, magnetic programming
switches, and a linear 4-20mA DC output. Magnetic program switches (located on either side of the ITM) are
activated by a hand-held magnetic programming tool, allowing non-intrusive operator interface with the
transmitter module. Electrical classifications are Class I, Div 1, Groups B, C, and D.
Figure 4 Functional Block Diagram
Field Replaceable Sensor
Detcon
ꞌs electrochemical gas sensors are field proven, plug-in sensors with over-sized gold-plated connections
that eliminate corrosion problems. The sensor can be easily accessed and replaced in the field by releasing the
locking screw and unthreading the splashguard adapter assembly. Detcon
ꞌs toxic sensors have a long shelf life
and supported by an industry-leading warranty.
I/O
Circuit
Protection
mA Output
Power In
Power
supplies
Micro-
Processor
Intrinsically
Safe Barrier
Plug-In
Sensor Modbus Output
CX-DM Instruction Manual Rev. 1.3 Page 2 of 40