Types Of Pressure Sensors
There are different types of pressure sensors. They are classified in terms of temperature range of operation or the pressure ranges they measure.
Therefore, the most important classification is made according to the type of pressure they measure. From this point of view, pressure sensors can be divided into five categories.
First of all, let’s consider absolute pressure sensors. They measure pressure relative to perfect vacuum pressure, let’s say 0 PSI (Pounds per Square Inch) or no pressure. To make it more clear, atmospheric pressure at sea level is 14.7 PSI.
The gage pressure sensor can be applied for different purposes, because it can be calibrated to measure the pressure relative to a given atmospheric pressure at a given location. A tire pressure gage is a good example of how this type of pressure sensor functions. When the tire pressure gage indicates 0 PSI, there is in fact 14.7 PSI in the tire, which is the atmospheric pressure.
The vacuum pressure sensor is used to measure pressure less than the atmospheric pressure at a given location. In other words, it indicates the difference between the atmospheric pressure and the absolute pressure.
A sealed pressure sensor has approximatively the same function as a gage pressure sensor, but with a small difference. Sealed pressure sensors are previously calibrated by manufacturers to measure pressure relative to sea level pressure.
The variety of pressure sensors will help you choose the one you need, because the purposes of their usage may be very different.
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