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SOI technology extends life of melt pressure sensor
12th April 2008
 Traditional transducers for measuring the pressure of plastic melt extrusion use mercury or oil filled capillaries to isolate the sensing element from the very high media temperature and require a relatively thin isolation diaphragm to transmit the pressure through the fluid.
The IMPACT melt pressure transducer has no mercury or oil filling but instead incorporates a new 'Silicon on Insulator' (SOI) strain gauge sensing element which can withstand very high temperatures without any need for capillary isolation which degrades the accuracy, stability and sensitivity of the sensing element. The SOI chip is positioned directly behind a process contact membrane which exploits the high stability qualities of silicon strain gauge technology to provide a more stable reading requiring less re-calibrations over time. The very high gauge factor properties of the SOI pressure sensor chip have made it possible to use a process contact membrane that is 15x thicker than the ones used in traditional plastic melt pressure sensors and thus offer much greater abrasion resistance with a much more robust mechanical design extending operating life of the sensor. The IMPACT high temperature pressure transmitters can work with process temperatures up to 350 Deg C in direct contact with the contact membrane and achieve a total error band of better than +/-2.5% of full scale over a wide process temperature range of +20 to +350 Deg C. The IMPACT plastic injection pressure sensor is available with a 4-20mA current output (IE), or with a 5V or 10V (IN) amplified voltage output. The IMPACT melt pressure transducers offer a major improvement in performance for users of plastic extrusion moulding machines with a longer life for their sensors and improved accuracy & stability of process measurements.
Related Products Technical info for the IMPACT pressure transducer Technical info for the IMPACT pressure transmitter Plastic melt pressure transducers and transmitters High temperature media compatible pressure sensors Flush diaphragm pressure sensors for highly viscous liquids Pressure sensors grouped by sensing technology
Associated Topics Measuring the pressure of viscous media Sanitary pressure transmitter for measuring food processing media up to 300 degC
Resources Reference guide to pressure sensor terminology Convert temperature to Celsius, Fahrenheit or Kelvin Pressure converter and unit conversion factors
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