Campbell HMP 35A Manuel d'instructions télécharger pdf (Page 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

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 43 44

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Campbell HMP 35A Manuel d'instructions Page 31

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