Campbell HMP 35A Manual de Instruções descarregar pdf (Página 31)

Appendix B. Example Programs

B.3 Mean Vapor Pressure Example

Below is an example CR1000 program that computes mean vapor pressure.

TABLE B-3 shows the wiring used for these examples.

Other CRBasic dataloggers are programmed similarly.

TABLE B-3. Wiring for Vapor Pressure Examples

Color Description CR1000

Yellow Temperature SE 2 (1L)

Blue Relative Humidity SE 1 (1H)

White Signal Reference

Red Power SW12V

Black Power Ground

Clear Shield

'CR1000 program that calculates Vapor Pressure

Public AirTC

Public RH

Public RH_Frac, e_Sat, e_kPa

DataTable(Temp_RH,True,-1)

DataInterval(0,60,Min,0)

Average(1,AirTC,IEEE4,0)

Sample(1,RH,IEEE4)

Sample(1,e_kPa,IEEE4)

EndTable

BeginProg

Scan(5,Sec,1,0)

'HMP155A Temperature & Relative Humidity Sensor measurements AirTC and RH:

PortSet (9,1)

Delay(0,2,Sec)

VoltSE(AirTC,1,mV2500,2,0,0,_60Hz,.14,-80)

VoltSE(RH,1,mV2500,1,0,0,_60Hz,0.1,0)

PortSet (9,0)

If RH>100 And RH<108 Then RH=100

'Calculate Vapor Pressure

'Convert RH percent to RH Fraction

RH_Frac = RH * 0.01

'Calculate Saturation Vapor Pressure

SatVP(e_Sat, AirTC)

'Compute Vapor Pressure, RH must be a fraction

e_kPa = e_Sat * RH_Frac

CallTable(Temp_RH)

NextScan

EndProg

B-3

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