In pressure sensors, pressure measurement is based on themovements of the elastic elements under different pressures.Since there is no elastic element able to move under low andhigh pressures, there is a serious limitation to measuring low andhigh pressures concurrently. This paper proposes an innovativemechanism for measuring high and low pressures concurrently. Inthe proposed mechanism, a variable-thickness diaphragm and aprotective part were used to measure a broad range of pressures.The proposed mechanism was manufactured and the accuratepressure source was used to test the behavior of the mechanismunder different pressures. Using this configuration raised thesensitivity and accuracy of high-range pressure sensors, andincreased the turndown ratio to 1500 by employing a new elasticelement. Employing this mechanism in pressure sensors leads touse one pressure sensor for measuring a broad range of pressureinstead of using several distinct sensors.
