MAINTENANCE
7 - 11
Figure 7-6 shows the assembly drawing of the gas inlet tube and
tube cap holder. The gas inlet tube is made of a piece of Teflon
tube. A metal ferrule is crimped onto the Teflon tube and the
V-grove on the metal tube adapter provides an air tight seal
when the tube cap is tightened. A spring maintains the
necessary tension for the metal tube adapter so that it pushes the
RAE-SEP tube against the sensor module. A piece of rubber
tube is glued on to the metal tube adapter and provides airtight
seal to the other end of the RAE-SEP tube. After repeated
insertion, the rubber tube may also be worn out. Replace the
entire metal tube adapter with a new one if necessary to ensure
airtight seal for the RAE-SEP tube.
To replace the metal tube adapter, remove the tube holder cap
from the bar code reader cap. Grab and pull the tube cap nut
away from the tube-holder cap body. Use a hex wrench to hold
the metal tube adapter by the flat section, unscrew the tube cap
nut counter-clockwise to disassemble the tube holder cap and
gas inlet tube assembly. Replace a new metal tube adapter.
