Detcon CXT-IR - Manual (Page 7)

Model CXT-IR
1.2 Modular Design
The Model CXT-IR Sensor Assembly is completely modular and is made up of four parts (Figure 3)
1) CXT-IR Intelligent Transmitter Module (ITM)
2) Plug-in infrared Sensor
3) CXT Series Bottom Housing
4) Splash Guard
100 Series Bottom
Housing Assembly
Plug-in
Replaceable
Sensor Cell
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 in order to
maximize corrosion resistance in harsh environments.
1.2.1 CXT-IR Intelligent Transmitter Module
The Intelligent Transmitter Module (ITM) is a fully encapsulated microprocessor-based package that accepts a
plug-in field replaceable combustible gas sensor.
Circuit functions include (Figure 4):
• extensive I/O circuit protection,
• sensor pre-amplifier,
• on-board power supplies,
• microprocessor,
• LED display,
• magnetic programming switches,
• built-in 2.4GHz radio
Magnetic program switches located on either side of the LED Display are activated by a hand-held magnetic
programming tool, allowing a non-intrusive operator interface with the ITM. The program switches allows
calibration without declassifying the area.
I/O
Circuit
Accessory
connections
Wireless
Micro-
Processor
Intrinsically
Safe Barrier
Plug-In
CXT-IR Instruction Manual Rev. 1.6 Page 3 of 44