INSTRUMENT MANUAL
VACUUM GAUGE MODEL MM200
160Phone:(215) 947-2500 fax:(215) 947-7464 e-mail:sales@televac.com web site:www.televac.com
MM-200_im REV M
Page 25 of 160
305 VACUUM CONNECTION FITTINGS
Six types of vacuum connection fittings are used in the
gauge system: NPT, O-ring compression, ConFlat flange,
KF, CAJON 8VCR and CAJON 8VCO. (See Table 3.2). A discussion of each is provided below
1. NPT PIPE THREAD CONNECTIONS - These connections should be sealed using vacuum sealing compound
such as TORR-SEAL, Teflon tape or paste. TORR-SEAL is a trademark of Varian Associates Inc.
2. O-RING COMPRESSION FITTINGS - Insert the tubulation of the gauge sensor into the fitting carefully to
avoid damage to the O-ring inside the fitting. The connection is then hand-tightened to create a seal. Do not
over tighten the connection.
If necessary, a small amount of vacuum grease may be used to obtain a good vacuum seal.
3. CONFLAT FLANGE FITTINGS - ConFlat and similar compatible types made by other manufacturers are
widely used for attaching devices to ports on high vacuum systems. These flanges utilize knife-edge surfaces
and compression of copper gaskets to secure a vacuum seal. Be careful not to damage or contaminate the
knife-edges or gaskets during handling operations. (Do not touch copper gasket with hands.) Copper
gaskets should be utilized when high temperature or ultra-high vacuum operation is intended. Tighten all
flange bolts evenly and fully in a crisscross pattern. Do not use copper gaskets more than once. If the flange
is to be baked, pre-lubricate the bolt threads with an antiseize compound (FelPro R C 100 or equivalent).
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