Detcon PI-700 - Manual (Page 11)

Model PI-700
PI-700 Instruction Manual Rev. 2.5 Page 7 of 54
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"
12.55"
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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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7.935"
Ø0.265" x2
S
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Mounting Holes
8-32 Thread
Ground Point
detcon inc.
VOC
MODEL
PI-700
Figure 7 Outline and Mounting Dimensions
2.5 Electrical Installation
The Sensor Assembly should be installed in accordance with local electrical codes. The sensor assemblies are
designed for Class I, Division 1, Groups B, C, & D area classifications, and for ATEX 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 9 for proper electrical installation.
NOTE: If a conduit run exits the secondary port, repeat the installation technique shown in
Figure 8.
In Figure 8, 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.
NOTE: A conduit seal is typically required to be located within 18" of the J-Box and Sensor
Assembly. Crouse Hinds type EYS2, EYD2 or equivalent are suitable for this purpose.