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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.