Campbell-scientific 110PV Surface Temperature Probe Uživatelský manuál stáhnout pdf (Strana 18)

110PV Surface Temperature Probe

5.1.1.1 Sample Program for CR200(X) Series Datalogger

'CR200 Series Datalogger

'This example program measures a single 110PV-L probe

'once a second using the ExDelSE instruction and stores

'the average temperature in degrees C every 10 minutes.

'110PV-L Wiring configuration for program example

'Lead Color CR200(X) Channel Description

'Black ------ VX1 ------------ Voltage Excitation

'Red -------- SE1------------- Signal

'Purple----- AG-------------- Signal Reference

'Blue ------- Not Used ------ N/A

'Green ----- Not Used ------ N/A

'White------ Not Used ------ N/A

'Clear------ AG-------------- Shield

'Declare variables for temperature measurement

Public T110PV_mV

Public T110PV_Res

Public T110PV_Temp_C

Public T110PV_Temp_F

'Declare constants to be used in Steinhart-Hart equation

Const A=1.129241*10^-3

Const B=2.341077*10^-4

Const C=8.775468*10^-8

Const R_cable=0 'see sensor cable for cable resistance

'Declare variable units

Units T110PV_mV= millivolts

Units T110PV_Res=Ohms

Units T110PV_Temp_C=Deg C

'Define a data table for 10 minute averages

DataTable (AvgTemp,1,1000)

DataInterval (0,10,min)

Average (1,T110PV_Temp_C,False)

EndTable

'Main Program

BeginProg

Scan (1,Sec)

' Measure 110PV-L probe with SE1

ExDelSE (T110PV_mV,1,1,Ex1,mV2500,500,1.0,0)

' Convert mV to ohms

T110PV_Res = 4990*(2500/T110PV_mV)-4990

' Subtract off cable resistance (see 110PV-L cable for R_cable)

T110PV_Res = T110PV_Res-R_cable

' Using the Steinhart-Hart equation to convert resistance to temperature

T110PV_Temp_C = (1/(A+B*LOG(T110PV_Res)+C*(LOG(T110PV_Res))^3))-273.15

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