CS115 Barometric Pressure Sensor

The CS115 Barometric Pressure Sensor uses the resonant silicon technology pressure sensor developed by Druck. The sensor outputs a variable frequency which can be measured using the datalogger's period averaging instruction or pulse count instruction. The entire process is essentially digital from sensor element to datalogger, ensuring the highest precision and most accurate reading possible.

1. Introduction

The sensor comprises two elements, one acting as a pressure sensitive diaphragm and the other acting as a resonator. Pressure variations deflect the sensitive diaphragm and change the sensor’s resonant frequency. The resonant frequency is measured, corrected for the effects of temperature and non- linearity, and then output as a frequency signal. The sensor is characterized over the full temperature and pressure range, and the corrections are stored in the sensor's non-volatile memory. It can be operated in a triggered or continuous mode. In the triggered mode the datalogger switches 12 VDC power to the barometer before the measurement. The datalogger then powers down the barometer after the measurements to conserve power.

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