Understanding Absolute Pressure Sensors, A Honeywell’s Application Note

Inside this application note the reader can read information about absolute pressure, output, ambient barometric pressure, perfect vacuum, sensor, pressure, absolute pressure sensors, and reference pressure. There are lots of info about measuring, sensing and control, offset error, reference, offset voltage, voltage, span, and calibration process are described inside the application note.

The application note presents information related to sensitivity, ambient pressure, normal atmospheric pressure, control, sensing, circuit, sensors, and absolute sensor. Below are selected from this application note:

Understanding Absolute Pressure Sensors INTRODUCTION Most people are typically accustomed to dealing in gage pressure, that is, pressure relative to the normal atmospheric pressure which surrounds us. FIGURE2 Sensor Amplifier Circuit with Calibration Adjustments 2 Honeywell • Sensing and Control Technical Note Understanding Absolute Pressure Sensors (This is equal to14.60 psi, as 755 mmHg x 0.019337 psi/mmHg=14.60 psi.) Mathematically, it can easily be shown that using these two refer ence pressure points (barometric pressure and a gage reference), one can properly adjust for offset and span. Technical Note CONCLUSION Although absolute pressure sensors are perhaps not as well understood or easily calibrated as gage pressure devices, by using barometric pressure as a reference in conjunction with any other reference point, gage or absolute, absolute pressure devices can be accurately calibrated.

Furthermore, this application note contains discussion about atmospheric pressure, differential pressure, vacuum reference, barometric pressure, gage pressure, error, and calibration.

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