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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