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Trafag pressure transmitter

Trafag pressure transmitters function on the following principles:

Thin-film-on-steel

By means of complex coating processes under high vacuum, a thin layer of film, only a few micrometers thick, is superimposed on a stainless steel membrane. The pressure sensor is then welded together with a pressure connection to form an assembly highly compatible with sample media.

Advantages

  • Completely weld-sealed sensor system made of stainless steel
  • No additional materials (e.g. O-rings) which could limit compatibility with certain sample media
  • Withstands very high overpressures of at least twice nominal pressure (burst pressure: approx. 3...10-fold of nominal pressure)
  • For gauge pressure ranges of 0....200 mbar up to 0....2000 bar
  • Excellent long-term stability (zero point less than 0.1% FS after 1000 h at 120°C)
  • High temperature-resistance
  • No backfilling of liquid necessary

Thick-film-on-ceramic

A Wheatstone bridge is superimposed onto a ceramic membrane by means of a screen printing process (thick film), and then fired.

Advantages

  • Resistant to aggressive media
  • For gauge and absolute pressure ranges from -1 to 250 bar
  • Inexpensive pressure sensor system for straightforward applications
  • No backfilling of liquid necessary

Piezo-resistive systems:

In the piezo-resistive process, pressure is transferred indirectly to the measurement membrane via a liquid, normally silicone oil. Due to the temperature dependence of this transfer liquid, the procedure is influenced by changes in temperature. Temperature-compensation is therefore essential.

Advantages

  • Inexpensive pressure measurement sensor
  • Large degree of freedom in arrangement of pressure connections (e.g. front-flush and submersible diaphragms)
  • Low-level pressure ranges up to 100mbar (absolute or gauge pressure measurements)


 

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