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Low pressure sensor for wet media
3rd February 2007
 Measuring low pressures requires very sensitive diaphragms and many of the sensor technologies that are available are only compatible with low humidity gases.
If you are looking to measure very low pressures of humid gases or a liquid it is advisable to make sure that the sensors construction will resist corrosion and no electrical connections are vulnerable to moisture damage over time. The size and shape of the internal volume close to the sensing diaphragm is also important, because the surface tension effects of a fluid become more prominent at lower pressure ranges. The DRS low differential pressure transmitter includes a hermetically sealed highly sensitive LVDT position sensor which is coupled with an all welded stainless steel diaphragm. The DRS differential pressure sensor is protected from high overload pressures by a mechanical stop on each side of the sensing diaphragm. The oil filled WS type is compatible with liquids and is overpressure protected internally so that the surface tension of the liquid has minimal impact on the performance of the sensor. The pressures ranges covered by the DRS wet wet differential pressure transmitter are 1.6mb up to 6 bar diff and they are all accurate to +/-0.25% of maximum span including linearity, hysteresis, and repeatability. The DRS dp cell has digital electronics which offer a choice of 4-20mA current loop, 0-5 or 0-10V amplified voltage output signals. Any full scale range can be turned down by up to 5 to 1 and the zero point can be offset to any point between -50 and +100% of full scale. The DRS differential pressure transducer can also be configured for flow measurement applications with a selection of square root non-linear outputs.
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