Campbell-scientific 237-L Leaf Wetness Sensor Instrukcja Użytkownika Pobierz pdf (Strona 8)

Model 237 Leaf Wetness Sensor

4. Programming Examples

Each example program measures leaf wetness and outputs a sample resistance

and a time fraction the sensor is wet. In these examples, the output interval is

set to 60 minutes, so a time fraction wet of .33 is equivalent to 20 minutes

during that hour. Wetness threshold is set at 150 kΩ.

4.1 CR1000 Program Example

Public Vs_Vx

Public Rs_kOhms

DataTable(Wetness,true,-1)

OpenInterval

DataInterval(0,60,Min,10)

Sample(1, Rs_kOhms, FP2)

Histogram(Rs_kOhms, FP2, 0, 1, 001, 1 , 0, 150) 'Enter threshold in 8th parameter

EndTable

BeginProg

Scan(60,Sec, 3, 0)

BRHalf(Vs_Vx, 1, mV25, 1, VX1, 1, 2500, True, 0, 250, 1, 0)

Rs_kOhms = (1 / Vs_Vx) - 101

CallTable Wetness

NextScan

EndProg

4.2 CR200(X) Programming

'CR200(X) Series Datalogger

Public Vs_Vx

Public Rs_kOhm

Public ScanIntervalWet

Public ScanIntervalSum

Public TimeFractionWet

DataTable (Wetness,1,-1)

DataInterval (0,60,min) 'Interval must match IfTime interval (below)

Sample (1,Rs_kohm)

Sample (1,TimeFractionWet)

EndTable

BeginProg

Scan (1,Min)

'Measure Wetness

ExDelSE(Vs_Vx,1,1,1,mV2500,500,.0004,0)

'Zero measurement when measurement < 0

If Vs_Vx < 0 Then Vs_Vx = 0

Rs_kOhm = (1 / Vs_Vx) - 101

'Sum Scan Intervals

ScanIntervalSum = ScanIntervalSum + 1

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