Model DM-100
DM-100 Instruction Manual
Rev. 3.5
Page 9 of 41
When mounting on a pole, secure the Junction Box to a suitable mounting plate and attach the mounting plate
to the pole using U-Bolts. (Pole-Mounting brackets for Detcon Junction Box’s are available separately.)
8-32 tapped
ground point
4.35"
3
4
NPT Ports
6.1"
5.5"
1
4
" mounting holes
Wal
l
(or
ot
her
m
ount
ing su
rf
ace)
Splash Guard Adapter
Splash Guard
2"
DETCON, INC.
H2S
100 PPM
DM-100
ITM Assembly
13.75" Typ.
9.625" Typ.
Use spacers to move
sensor assembly away
from wall at least 0.5".
S
pacer
Figure 11 Typical DM-100 Sensor Assembly and Mounting Dimensions
2.5
Electrical Installation
The Sensor Assembly should be installed in accordance with local electrical codes. The sensor assemblies are
CSA/NRTL approved (US and Canada) for Class I, Division 1, Groups A, B, C, & D area classifications, and
are ATEX Approved for Class I, Zone 1, Group IIC area classifications.
Proper electrical installation of the gas sensor is critical for conformance to Electrical Codes and to avoid
damage due to water leakage. Refer to Figure 8 and Figure 12 for proper electrical installation.
NOTE
If a conduit run exits the secondary port, repeat the installation technique shown in
Figure 12.
In Figure 12, the drain allows H
2
O condensation inside the conduit run to safely drain away from the sensor
assembly. The electrical seal fitting is required to meet the National Electrical Code per NEC Article 500-3d
(or Canadian Electrical Code Handbook, Part 1, Section 18-154). Requirements for locations of electrical seals
are covered under NEC Article 501-5. Electrical seals act as a secondary seal to prevent water from entering
the wiring terminal enclosure. However, they are not designed to provide an absolute watertight seal,
especially when used in the vertical orientation.
