Schelt Technology

Measurement principleThe piezoelectric pressure sensor’s signal is electronically amplified to provide an output signal of 0...5 VDC.MountingThe sensor is mounted in a stainless steel housing, protection class IP64 when the connector is plugged in.When mounted outside the central steel cabinet we recommend protective housing with pressurecompensation.In measurement operation the sensor needs an external supply of at least 9 VDC.

The piezoelectric pressure sensor’s signal is electronically amplifi ed to providean output signal of 0...5 VDC. The sensor is mounted in a stainless steel housing,protection class IP64 when the connector is plugged in.If required, the sensor is ready for connection in an Ammonit steel cabinet.
When mounted outside the central steel cabinet we recommend protective hous-ing with pressure compensation.
In measurement operation the sensor needs an extern supply of at least 9 VDC.

Pressure is defined as force per unit area applied to a surface in a direction perpendicular to the surface.Barometric pressure, or atmospheric pressure, is the force per unit area exerted on Earth’s surface by the mass ofair overlying the surface. High pressure indicates more atmospheric air mass over a given area, whereas lowpressure indicates less atmospheric air mass. Barometric pressure is strongly dependent on elevation, anddecreases as elevation increases, due to less overlying air above the surface (shorter column of air) at higherelevations.Barometers are sensors that measure barometric pressure. Aneroid (without liquid) barometers are oftenelectronic and typically use capacitive elements to sense pressure, with the major advantage of capacitive sensingmechanisms being minimal temperature dependence. Capacitive sensing circuits output a voltage that is related topressure via sensor-specific calibrations. Typical units for barometric pressure are kilopascals [kPa] and millibars[mb] (hectopascals [hPa], pounds per square inch [psi], and millimeters of mercury [mm Hg] or inches of mercury[in Hg] have also been used).Barometric pressure is a fundamental weather variable. Typical applications of barometers include barometricpressure measurement in weather networks, often for weather forecasting. Barometric pressure is also an inputvariable required for calculation of evapotranspiration. Additionally, barometric pressure measurements are usedto correct the output of sensors that are sensitive to pressure fluctuations (e.g., Apogee Instruments oxygensensors).Apogee Instruments SB-100 barometric pressure sensors consist of a silicon capacitive sensing element and signalprocessing circuitry mounted in a compact epoxy plastic/stainless steel housing, and lead wires to connect thesensor to a measurement device. Sensors are weather resistant and are designed for continuous barometricpressure measurement when housed inside the same enclosure as the measurement device (e.g., datalogger orcontroller). SB-100 pressure sensors output an analog voltage that is directly proportional to barometric pressure.