Campbell CS100 Manual descarregar pdf (Página 17)

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

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 23 24

Sem comentários

Campbell CS100 Manual Página 17