GasSens
Gas Detection System
Section 1 - Overview
O & M Manual
A14-RK, 8/06
1 - 6
MECHANICAL INSTALLATION
System enclosures, battery back-up units, and sensor transmitters are all designed for
surface mounting using screws or bolts inserted through the recessed mounting holes at each
corner of the enclosures. Included with each system enclosure is a template with mounting hole
dimensions for two and three module system enclosures, battery back-up enclosure, and
sensor/transmitter enclosure. The template can be used to mark hole centers on walls or
mounting panels.
Mounting recesses are suitable for #6 or #8 machine screws or wood screws. Screw length
will vary with specific site conditions.
Two and three module system enclosures provide knockouts on all four sides to allow wiring
conduit to be connected in the most convenient way. Enclosures are shipped with all knockouts in
place except for the larger knockout on the bottom, where the audible horn is installed if ordered.
See pages 1-6 through 1-9 for dimensional drawings of the one, two, three and six module
enclosures.
Each enclosure is supplied with conduit hubs for connection of 1/2" NPT threaded conduit.
Also included is a seal ring for each hub.
Seal rings are required to provide a water tight
conduit hub connection to the enclosure.
The following lists the number of hubs that should
be included with each enclosure type.
Two module Enclosure - 4 hubs
Three module Enclosure - 6 hubs
Six Module Enclosures - 6 hubs
Battery back-up Enclosure - 2 hubs
Sensor/Transmitter Enclosure - 1 hub
Conduit hubs are installed in any enclosure knockout labeled PG16. Note that some
knockouts have more than one designation, such as PG11/16. Those with two designations will
have concentric circles for knockouts. The inner circle marks the lower PG number while the
outer circle marks the higher number. Place a thin bladed screwdriver into the circular slot or the
desired knockout size and tap firmly with a hammer. To install the hub, place the seal ring over
the threaded part of the hub. Locate the hub nut on the inside of the enclosure and screw the hub
into the hub nut from the outside. Tighten firmly to insure that the seal ring provides a good seal
between the hub and the outside of the enclosure.
