Model FP-700
FP-700 Instruction Manual Rev. 5.1 Page 10 of 46
3.5"
Explosion Proof Enclosure
Junction-Box
Sensor Assembly
Splash Guard
(Detcon's Mini SS Junction-Box shown)
2.125"
3.45"
11"
Typ.
Mounting Holes
8-32 Thread
Ground Point
Ø0.4" x .475"
detcon inc.
LEL Sensor
MODEL
FP-700
Figure 12 Outline and Mounting Dimensions (Mini Stainless Steel Junction Box)
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 II 2G Ex d IIB+H
2
Gb 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 13 and Figure 14 for proper electrical installation.
NOTE: If a conduit run exits the secondary port, repeat the installation technique shown in
Figure 13.
In Figure 13, 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: For products utilizing the aluminum junction box option, the conduit seal shall be placed
at the entry to the junction box (see Figure 13 as an example). For products utilizing the stainless
steel junction box option, the conduit seal shall be placed within 18” of the enclosure. Crouse
Hinds type EYS2, EYD2 or equivalent are suitable for this purpose.
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