QCM Sensor Feedthroughs

QCM Sensor Feedthroughs

Manufacturer: INFICON

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INFICON offers a variety of Quartz Crystal Monitor (QCM) sensor feedthroughs to accommodate many QCM sensor and chamber configurations. CF40 (2.75 in. ConFlat®) and 2.54 cm (1 in.) bolt style feedthroughs are available with various combinations of electrical connections, water cooling, and air tubes. INFICON feedthroughs may also be equipped with Ultra-Torr O-ring compression fittings for easy installation and sensor length adjustment. Other feedthrough styles may be available on request (KF40, etc), so contact INFICON with your feedthrough needs.

Unless noted, a typical feedthrough electrical connection consists of a coaxial BNC connector on the atmosphere side and a Microdot® connector on the vacuum side. This style of electrical connection is meant for use with in-vacuum cable sensors such as INFICON Front Load single, Front Load dual, Low Profile single, select Low Profile dual, Sputtering, CrystalSix, and Crystal 12 sensors.

Note: Feedthrough water and air tubes are 4.8 mm (3/16 in.) OD.

Note: Low Profile dual sensors use 4.8 mm (3/16 in.) OD water cooling tubes.  They are not compatible with Ultra-Torr equipped feedthroughs and require a tubing adapter in order to be welded to a standard feedthrough with 4.8 mm (3/16 in.) OD water cooling tubes.

The following table is a quick reference for feedthrough requirements and part numbers based on sensor type.

Data sheet


  • 2.54 cm (1 in.) bolt or CF40 (2.75 in. ConFlat®) styles available
  • Available Ultra-Torr O-ring compression fittings
  • Custom feedthrough configurations available
  • Other feedthrough styles available on request