Detcon CXT-DM - Manual (Page 7)

Model CXT-DM
CXT / 700 DM Series
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
Ferrite Bead
Figure 4 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-DM Intelligent Transmitter Module
The Transmitter Module is a microprocessor-based package that is 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 via a hand-held magnetic programming tool, thus allowing non-intrusive operator
interface with the Transmitter Module. Electrical classifications are Class I, Div 1, Groups B, C, and D.
Figure 5 Functional Block Diagram
1.2.2 Field Replaceable Sensor
The Detcon family of electrochemical gas sensor is 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. Detcon’s family of toxic
sensors has a long shelf life and is supported by an industry-leading warranty.
Figure 6 Plug-in Sensor
I/O
Circuit
Protection
Accessory
connections
Antenna
Power In
Wireless
Power
supplies
Micro-
Processor
Intrinsically
Safe Barrier
Plug-In
Sensor
CXT-DM Instruction Manual Rev. 1.6 Page 3 of 52