CS100 Barometric Pressure Sensor
7.3 Programming
The CS100 sensor is measured using the singled-ended voltage measurement
instruction (
VoltSE()
in CRBasic and Instruction 1 in Edlog).
Atmospheric pressure changes little with time. In most weather station
applications measuring pressure once an hour is adequate.
7.3.1 Conversion Factors
In the example programs, the pressure is reported in millibars (mb). To report
pressure in different units, multiply the measured pressure by the appropriate
conversion 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. See
TABLE 7-2 below for conversion factors.
TABLE 7-2. Conversion Factors for
Alternative Pressure Units
To Find
Multiply by
hPa 1.0
kPa 0.1
mm of Hg
0.75006
in of Hg
0.02953
Psi 0.0145
Atm 0.00099
Torr 0.75006
7.3.2 Multipliers and Offsets for Different Measurement Range Options
Please refer to the table below for proper multipliers and offsets.
TABLE 7-3. Multipliers and Offsets
Range Options
Multiplier
Offset
600 to 1100 mb
(Standard range)
0.2 600
500 to 1100 mb
0.24
500
800 to 1100 mb
0.12
800
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