Detcon DM-200 - Manual (Page 7)

Model DM-200
DM-200 Instruction Manual Rev. 2.0 Page 3 of 40
Figure 4 Universal Transmitter Module
Figure 5 4-20 mA Field Wiring
1.4 Intelligent Sensor Module (ISM)
The ISM is microprocessor-based and is packaged as a plug-in replaceable module that facilitates easy
replacement and minimum downtime. The module is composed of sensor cell and ISM circuitry, permanently
potted in epoxy, and retained within a plug-in stainless steel mechanical assembly. Circuit functions include
an electrochemical sensor pre-amplifier, PIC microprocessor, and memory data storage. The ISM plugs into
the UTM via 5 rigid gold plated pins and is then secured via a threaded machined collar that screws on and
provides mechanical stability and a water-tight seal.