Detcon DM-100 - Manual (Page 6)

Model DM-100
DM-100 Instruction Manual Rev. 3.3 Page 2 of 40
The DM-100 O
2
deficiency sensor technology is a two electrode galvanic metal air battery type cell, which is
housed as a field replaceable intelligent plug-in sensor. The cell is diffusion limited and functions as a direct
current generator proportional to the amount of oxygen adsorption. The sensors are temperature compensated
and show good accuracy and stability over the operating temperature range of -20° to 50°C (-4° to +122° F).
The sensor is warranted for two years and has an expected service life of up to 2.5 years in ambient air at
20.9% oxygen.
Figure 3 Construction of Galvanic Cell
1.2 Modular Mechanical Design
The Model DM-100 Sensor Assembly is completely modular and is made up of four parts (Figure 4):
1. DM-100 Intelligent Transmitter Module (ITM)
2. Intelligent Plug-in Sensor (varies by gas type and range)
3. 100 Series Bottom Housing Assembly (H2S assemblies use 100 Series Bottom Housing Assembly
with Integral Filter)
4. Splash Guard.
O-Ring
100 Series Bottom
Housing Assembly
Plug-in
Replaceable
Sensor
Interconnect
Wires
Housing Bottom
Locking Screw
Intelligent Transmitter Module (ITM)
Micro-processor controlled circuit
encapsulated in an Explosion proof
housing.
Magnetic
Programming
Switches
Splash Guard
D E T C O N , IN
C .
H
2
S
1
0
0
P
P
M
D
M
-1
0
0
3
4
" NPT Locking Nut
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.