INFICON STM-100/MF Thin Film Deposition Monitor - Manual (Page 45)

ELECTRICAL IN-VACUUM CABLE
The electrical cable from the sensor head to the vacuum feedthrough should
be wrapped around the water lines using up all excess length in the process.
Firmly tighten the connectors at both the sensor and feedthrough ends. The water
lines and sensor cable should then be wrapped with clean tin foil or other shielding
material to prevent evaporant build-up and also to aid cable cooling and
mechanical stability.
Bakeable sensing heads are custom User designed sensor units. The
electrical and water cooling lines are typically integral to the design of the unit.
The units are generally made on a 2 3/4" ConFlat type flange and is installed as a
one piece assembly. See Appendix B, Technical Drawings, for typical styles of
bakeable sensing heads.
The sensor head must always be operated at "GROUND" potential and this
connection is carried through the sensor feedthrough coaxial connectors and
shields. The remote oscillator is attached to the vacuum feedthrough via the six-
inch male / female coax cable. The long coax cable connects the remote oscillator
to the display unit. This cable must be a coaxial 50 Ohm type and can be up to
500 feet in length.
For safety purposes a ground wire should always be installed between the
vacuum vessel and earth ground. See Figure 3.2.
Vacuum Electrical
Connections
Bakeable Sensor
Page 3 - 11 INSTALLATION