Owner's Manual

GDX-350 Sensor Transmitter
P/N: 5600-9001 Rev 2 17
2. INSTALLATION INSTRUCTIONS
2.1. Sensor Location
Factors such as air movement, gas density in relation to air, emission sources and environmental
variables affect correct sensor location. Air movement by fans, prevailing winds and convection should
be carefully evaluated to determine if a leak is more likely to raise gas levels in certain areas within the
facility. Vapor density of a gas determines if it will rise or fall in air when there are no significant currents.
Lighter than air gases should have the monitors mounted 12-18 inches (30-45 centimeters) above the
potential gas leak and heavier than air gases should be the same distance below the point of leakage.
Even though the GDX-350 is designed for rugged service, sensors should be protected from water, snow,
shock, vibration, and dirt.
2.2. Mounting the Enclosure
2.2.1 Stand-alone and Wired Networks
The GDX-350 standard enclosure is a cast aluminum explosion-proof (NEMA 7) enclosure as shown in
Figure 2-1.
Figure 2-1: GDX-350 Explosion-Proof Housing
Modular design simplifies the installation of the GDX-350. A top Display Assembly is mounted with
captive thumbscrews and is easily removed to access field-wiring terminals. An optional Alarms/Modbus
board (P/N 5600-0007) mounts piggyback to the back of the Display Assembly. The enclosure is
equipped with two threaded, 3/4 inch NPT conduit fitting outlet and pre-drilled mounting flanges.
WARNING: Qualified personnel should perform the installation according to applicable
electrical codes, regulations and safety standards. Insure that correct cabling and seal
fitting practices are implemented. Install the GDX-350 to a wall or bracket using the
predrilled mounting flanges with I.D. 0.25 on 5.5 inch centers (Figure 2-1). If conduit is
rigid and able to support the weight of the GDX-350, the mounting bolts may be omitted.
WARNING: The sensor should never be installed pointing upwards.