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Measuring pressure of high temperature media with a hygienic flush sensor
29th April 2007
 The DMP331P flush diaphragm pressure transmitter can be used on liquids or gases up to a maximum temperature of 300 Degrees Celsius.
The very high process media temperature tolerance is achieved by integrating a cooling element between the isolating flush membrane and the silicon strain gauge sensing element. As long as the ambient temperature is significantly lower than the media temperature, the cooling element will dissipate high temperatures and reduce the temperature being conducted from the isolation diaphragm to a level that is within the operating temperature range of the pressure sensor electronics. It is common practice to stand off a pressure sensor with a long piece of dead ended pipe to reduce the temperature at the sensor, but this can reduce the dynamic response of the pressure measurement and add unwanted volume to the system which can upset the performance of a test or a process. By using a flush isolation diaphragm with a cooling element it is possible to measure high temp media pressures without introducing any extra volume to the system or damping the response of the pressure reading. A variety of hygienic flush diaphragms can be specified for clamp on or screw in fitment. For sanitary food and biotech installations a food grade oil fill can be specified to protect the product being processed or stored in case the open diaphragm is accidentally damaged causing it to leak the fill fluid into the system. The DMP331P high temperature pressure sensor can measure ranges from 100 millibar up to 40 bar with an accuracy of 0.175% full scale (0.25% for <0.4 bar) best straight line which includes non-linearity, hysteresis and repeatability errors. The pressure transmitter’s electronics provide a 4 to 20 milliamp current output signal and there is an ATEX approved version for intrinsic safety to allow use in a hazardous area with an appropriate IS zone barrier. There are many electrical connections to choose from including an IP68 cable gland for external wash down cleaning of the sensor and the popular DIN43650A plug & socket with an IP65 protection rating.
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