Detcon DM-100 - Manual (Page 7)

Model DM-100
DM-100 Instruction Manual Rev. 3.3 Page 3 of 40
DM-100 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, Division 1, Groups A, B, C, and D.
Figure 5 Functional Block Diagram
Field Replaceable Sensor
The Detcon family of electrochemical gas sensors 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 Splash Guard Adapter. Detconꞌs family of toxic sensors has a
long shelf life and is supported by an industry-leading warranty (Section 7).
Figure 6 Plug-in Sensor
I/O
Circuit
Protection
RS-485 Port
Analog 4-20mA Out
Power In
RS-485
4-20mA
Loop
Power
Micro-
Processor
Intrinsically
Safe Barrier
Plug-In
Sensor