RKI Instruments 35-3001A-01 - Manual (Page 13)

35-3001A-01 Combustible Gas Sample-Draw Detector • 9
ring, if it came out, in the orientation shown in Figure 4.
4. Screw the inlet fitting tube nut back onto the fitting body. See the next section for instructions
to install a new piece of tubing into the fitting.
Connecting the Sample Lines to the Sample-Draw Detector
See Figure 4 for the fitting layout.
Installing the Inlet Line with Particle Filter
1. Connect the particle filter to the tubing stub on the inlet by pushing the flexible tubing on the
filter onto the stub. Be sure the arrow on the particle filter is pointing toward the inlet fitting.
2. Connect a length of sample tubing to the other side of the particle filter and route it to the
sampling area. 1/4” O.D. rigid polypropylene, Teflon, or flexible polyurethane tubing may be
used. RKI Instruments, Inc. recommends using either 1/4” O.D. x 1/8” I.D. or 1/4” O.D. x
0.170” I.D. tubing based on your length requirements. See “Specifications” on page 1 for
maximum tubing lengths based on tubing size.
CAUTION: If you use flexible sample tubing (polyurethane is acceptable), use an appropriate
insert if necessary to provide support to the tubing and ensure a good seal when
connecting to the flexible stub on the filter.
CAUTION: Avoid loops or slumps in the incoming sample line. To reduce response time, keep the
incoming sample line as short as possible.
Installing the Inlet Line without Particle Filter
1. Remove the tubing stub as described in “Removing the Inlet Fitting Tubing Stub, if Necessary”
on page 8.
2. Loosen the nut on the inlet fitting until 3 threads are visible.
3. Push 1/4” O.D. rigid polypropylene or rigid Teflon sample tubing into the fitting until it stops.
Flexible polyurethane tubing may be used with an appropriate insert. RKI Instruments, Inc.
recommends using either 1/4” O.D. x 1/8” I.D. or 1/4” O.D. x 0.170” I.D. tubing based on your
length requirements. See “Specifications” on page 1 for maximum tubing lengths based on
tubing size.
CAUTION: If you use flexible sample tubing (polyurethane is acceptable), use an appropriate
insert to seal the connection between the tubing and the inlet fitting.
4. Hand tighten the nut on the inlet fitting so the ferrules clamp on the tubing. If the tube nut is
removed, see Figure 4 for the arrangement of the fitting components.
5. Route tubing from the inlet fitting to the sample area. See “Specifications” on page 1 for
maximum tubing lengths based on tubing size.
CAUTION: Avoid loops or slumps in the incoming sample line. To reduce response time, keep the
incoming sample line as short as possible.