Chemglass AF-0304 - Manual (Page 12)

10
3.3. Gauge Tube Installation
1. Thread the gauge tube into a 1/8 inch NPT female fit-
ting (or other fitting or flange as per your gauge tube), in
the vacuum system. The preferred mounting is with the
open end pointing down so as to be self draining to any
condensation. However, mounting in any position is ac-
ceptable.
2. An appropriate thread sealant is required to insure
that the threaded connection will not leak. Teflon thread
tape may be used to seal the threads if care is used so it
will not shred off and get inside the tube or vacuum sys-
tem. It is better to use mini-seal or an epoxy sealer on
the threads.
3. An excellent mounting system is to use an O-ring
quick connect to install the gauge tube. These may be
permanently installed in the system by welding, brazing
or soldering. For the 100 mTorr gauge tube a 3/4" quick
connect is required. The quick connects are available
from vacuum equipment suppliers such as the Kurt
Lesker Co. (1-800-245-1656).
4. Another alternative is to use quick flange adaptors.
Gauge tubes can be ordered with QF, VCR, and Mini-
Conflat flanges.