RKI Instruments GD-70D4H-XX - Manual (Page 7)

Model GD-70D4H-XX Sample Draw Transmitter • 4
GD-70D & Power Supply
The GD-70D sample draw detector head is mounted to a plate inside the enclosure. The
GD-70D sample fittings are factory connected to the sample fittings on the NEMA 4X
enclosure. The GD-70D is powered with 24 VDC supplied by a power supply that
operates from a 100 - 240 VAC input. The GD-70D is factory wired to the power supply
and to the horn/strobe. See the GD-70D operator’s manual for a complete description of
the GD-70D.
Horn/Strobe
A red horn/strobe is installed on the top right side of the enclosure. The GD-70D retains
its NEMA 4X rating with the horn/strobe installed. It is factory wired to the alarm 1 relay
terminals on the GD-70D and the 24 VDC output of the power supply so that it turns on
during an alarm 1 condition.
Installation
This section describes how to install the GD-70D4H-XX at the monitoring site.
Mounting the GD-70D4H-XX
1. Select a mounting site that is representative of the monitoring environment. Consider
the following when you select the mounting site.
• Select a site that is easily accessible for servicing.
• Select a site where the GD-70D4H-XX is not likely to be bumped or disturbed.
Make sure there is sufficient room to make wiring and sample line connections at
the bottom of the GD-70D4H-XX. Also make sure there is sufficient room to
perform start-up, maintenance, and calibration procedures.
• Select a site near the sampling area. The GD-70D4H-XX is designed to detect a
variety of toxic gases many of which are easily absorbed in sample tubing. Keep
the sample line length to a minimum. Teflon PTFE tubing is recommended.
• Use four 1/4” screws through the mounting feet to mount the GD-70D4H-XX to a
vertical surface. See Figure 3 for the mounting dimensions.