CS100 Barometric Pressure Sensor - Campbell Scientific

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CS100 Barometric Pressure SensorWireTABLE 7-1. Signal and Ground Connectors for CS100CS100 TerminalDataloggerSingle-Ended MeasurementDataloggerDifferential MeasurementBlue VOUT S.E. Input High Side of Diff InputYellow AGND AG (CR10(X), CR500, CR510)(Other Dataloggers)Black GND (21X, CR7, CR9000(X))G (Other Dataloggers)Green EXT TRIG Control port (use to turn poweron/off)Red SUPPLY 12 VDC 12 VDCShield Shield G (CR10(X), CR500, CR510)(Other Dataloggers)Low Side of Diff. Input(21X, CR7, CR9000(X))G (Other Dataloggers)Control port (use to turn poweron/off)G (CR10(X), CR500, CR510)(Other Dataloggers)WARNINGImproper wiring may damage the CS100 beyond repair.7.2.2 5-pin Screw Terminal Plug ConnectorThe datalogger connects to the CS100 via a 5-pin screw terminal plugconnector. This connector is removable and may be replaced. Thereplacement connector may come with a connector key attached to it to ensurethat the connector is plugged into the CS100 right side up (see FIGURE 7-3).When the connector is right side up, it will easily plug into the barometer.FIGURE 7-3. Connector key attached to 5-pin screw terminal plugconnectorWARNINGA 5-pin screw terminal that is plugged in upside downwill damage the sensor—perhaps beyond repair.10
CS100 Barometric Pressure Sensor7.3 ProgrammingThe CS100 sensor is measured using the singled-ended voltage measurementinstruction (VoltSE() in CRBasic and Instruction 1 in Edlog).Atmospheric pressure changes little with time. In most weather stationapplications measuring pressure once an hour is adequate.7.3.1 Conversion FactorsIn the example programs, the pressure is reported in millibars (mb). To reportpressure in different units, multiply the measured pressure by the appropriateconversion factor using the P37 (Z=X*F) instruction for CR500, CR510,CR10(X), CR23X, 21X, and CR7, or by adding an expression for CR200(X),CR800, CR850, CR1000, CR3000, CR5000, and CR9000(X) dataloggers. SeeTABLE 7-2 below for conversion factors.TABLE 7-2. Conversion Factors forAlternative Pressure UnitsTo FindMultiply byhPa 1.0kPa 0.1mm of Hg 0.75006in of Hg 0.02953Psi 0.0145Atm 0.00099Torr 0.750067.3.2 Multipliers and Offsets for Different Measurement Range OptionsPlease refer to the table below for proper multipliers and offsets.TABLE 7-3. Multipliers and OffsetsRange Options Multiplier Offset600 to 1100 mb 0.2 600(Standard range)500 to 1100 mb 0.24 500800 to 1100 mb 0.12 80011
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