Detcon CX-IR - Manual (Page 7)

Model CX-IR
CX-IR Bottom
Housing Assembly
Plug-in Replaceable
Sensor
Intelligent Transmitter Module (ITM)
Micro-processor controlled circuit
encapsulated in an Explosion proof
housing.
Magnetic
Programming Switches
Rain Shield
3
4
" NPT Locking
Nut
Ferrite Bead
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-IR 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
Detconꞌs infrared gas sensors are field proven, plug-in sensors with over-sized gold-plated connections that
eliminate corrosion problems. The sensor can be accessed and replaced in the field easily by releasing the
locking screw and unthreading the splashguard adapter assembly.
Figure 5 Plug-in Sensor
I/O
Circuit
Protection
mA Output
Power In
Power
supplies
Micro-
Processor
Intrinsically
Safe Barrier
Plug-In
Sensor Modbus Output
CX-IR Instruction Manual Rev. 1.2 Page 3 of 34