DSA / DSP Pressure Sensor

The SIKA DSA / DSP pressure sensors are used to measure relative pressure, overpressure or absolute pressure. High-quality stainless steel and front-flush diaphragm also allow these sensors to be used in viscous or contaminated media.

The measuring element is a silicon chip, out of which a diaphragm has been etched. A Wheatstone bridge circuit is formed by the application of foreign ions to the silicon diaphragm. When the diaphragm bends, a resistance change results which is a measurement of the pressure. If the rear side of the chip is prestressed with a reference vacuum, absolute pressure can also be measured.

Since silicon chips are very sensitive, the entire chip is enclosed in a measuring element chamber. This is for reasons of media compatibility. The chamber is separated from the medium by a stainless steel diaphragm. The pressure is transmitted with a neutral oil.