RKI Instruments GD-70D4H-XX - Manual (Page 6)

3 • Model GD-70D4H-XX Sample Draw Transmitter
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.
Inlet Fitting Tubing Stub
A short tubing stub comes factory installed in the inlet fitting. It is used for connecting the
hydrophobic filter. If the hydrophobic filter is not used, or if you install the hydrophobic
filter in a different location, the tubing stub needs to be removed and replaced with
tubing. Do not pull the tubing stub downward to remove it. Instead, unscrew the lower
inlet fitting nut from the fitting body. The tubing stub should come out with the nut. Be
careful not to lose the O-ring that may come out with the tubing stub. Push the tubing
stub up and out of the inlet fitting nut being careful not to lose the ferrule set. Push the
new tubing up through the inlet fitting nut and replace the ferrule set and the O-ring, if it
came out, in the orientation shown in Figure 2. Screw the inlet fitting nut back onto the
fitting body and push the tubing upward until it stops. See Figure 2 for the inlet fitting
layout.
Figure 2: Inlet Fitting with Tubing Stub
Front Farrule
1/4" Teflon Tube
O-ring
Nut
1/4" Teflon Tube
Back Farrule
Fitting Body