RKI Instruments GD-K77D4X-XX - Manual (Page 5)

Model GD-K77D4X-XX Sample Draw Transmitter • 2
Description
This section describes the components of the GD-K77D4X-XX. It consists of the enclosure
and a GD-K77D mounted inside. The “XX” at the end of the part number represents
characters that denote the target gas and changes depending on the target gas. For
example, the part number for a detector head for chlorine (Cl
2
) detection is GD-K77D4X-
CL2. Consult RKI Instruments, Inc. for a complete list of available part numbers.
A hydrophobic sample filter is also provided with the GD-K77D4X-XX for installation
near the inlet fitting. The filter has a short length of gray flexible tubing on each end and
can be connected to the short tubing stub on the GD-K77D4X-XX inlet fitting. The filter
scrubs particulates out of the sample stream and keeps water and many other liquids from
entering the GD-K77D4X-XX flow system.
Enclosure
The enclosure is a type NEMA 4X plastic enclosure designed for use in areas that are
subject to rain or hosing down. A mounting foot is installed in each corner. Two sample
fittings are mounted on the bottom right of the enclosure and two 3/4” conduit hubs are
mounted to the left of the sample fittings.
Sample Fittings
The inlet fitting is on the bottom right of the enclosure and the exhaust fitting is to the left
of the inlet fitting. The fittings accept 1/4”O.D. x 1/8” I.D. Teflon tubing. The inlet fitting
has a short factory installed tubing stub for use with the hydrophobic filter.
Conduit Hubs
Two 3/4” conduit hubs are located to the left of the sample fittings. They are used for
routing wiring into the enclosure by using conduit or an appropriate cable bushing.
Figure 1: Component Location
NEMA 4X Enclosure
(Cover not shown)
3/4" Conduit, 2X Exhaust
GD-K77D
Sample Inlet