Detcon DM-700 - Manual (Page 12)

Model DM-700
DM-700 Instruction Manual Rev. 4.0 Page 8 of 48
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 J-box accessories are available separately.)
3.675"
3/4" NPT
Explosion Proof Enclosure
Junction-Box
Sensor Assembly
Splash Guard
(Detcon's Junction-Box shown)
2.125"
5.5"
4.95"
5.25"
5.53"
2"
12.7"
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Use Spacers to move
the J-Box and Sensor
Assembly away from the
wall at least 0.25-0.5" to
allow access to Sensor
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8.06"
Ø0.265" x2
S
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Mounting Holes
8-32 Thread
Ground Point
detcon inc.
CO2 Sensor
MODEL
DM-700
Figure 8 Outline 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 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 9 and Figure 10 for proper electrical installation.
NOTE: If a conduit run exits the secondary port, repeat the installation technique shown in
Figure 9.
In Figure 9, the drain allows water 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 also act as a secondary seal to prevent water from
entering the wiring terminal enclosure. However, they are not designed to provide an absolute water-tight
seal, especially when used in the vertical orientation.