Detcon FP-700 - Manual (Page 12)

Model FP-700
FP-700 Instruction Manual Rev. 3.0 Page 8 of 40
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"
12.5"
M
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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
W
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)
7.855"
Ø0.265" x2
S
p
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Mounting Holes
8-32 Thread
Ground Point
detcon inc.
LEL Sensor
MODEL
FP-700
Figure 9 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 IIB+H
2
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 10 and Figure 11 for proper electrical installation.
NOTE: If a conduit run exits the secondary port, repeat the installation technique shown in
Figure 10.
In Figure 10, 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 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.
NOTE: The Detcon Warranty does not cover water damage resulting from water leaking into
the enclosure. However, since the electronics are 100% epoxy encapsulated, only the wire
terminations could get wet. Moisture could cause abnormal operation and possibly corrosion
to the terminal connections, but permanent damage to the sensor would not be expected.