Campbell-scientific OBS-3+ and OBS300 Suspended Solids and Turbidity M Uživatelský manuál stáhnout pdf (Strana 44)

Appendix B. Example Programs

'the true NTU. Big particles can cause errors that would skew an average

NTU = NTUX(11)

'Use the low range channel to get a more accurate measurement.

If NTU < 250 Then

'The value of 250 was chosen because it is the nominal low range value of

'this OBS sensor.

For i = 1 To n

VoltSe (NTUX(i),1,mV5000,2,1,0,_60Hz,0.001,0)

NTUX(i) = A(1) * NTUX(i)^2 + B(1) * NTUX(i) + C(1) ' V to NTU conversion

Delay(0,45,mSec) 'Delay between measurements

Next i

EndIf

SortSpa (NTUX(),21,NTUX())

NTU = NTUX(11)

SW12 (0)

'-------------------------------------------------------------------

CallTable Data_15m

NextScan

EndProg

B.1.2 CR200(X) Example Program

The following example uses the voltage curve of the calibrations certificate

provided in FIGURE 7-3. Since the coefficients of the voltage curve are used,

the multiplier for the VoltSE instruction needs to be 0.001.

The calibration values are different for each probe.

'CR200(X) Series Datalogger

'Boyd Bringhurst, CSI 3/05/08

Public batt_volt

Public NTU, NTU_SD

Public NTUarray(10)

Public n,i

Public A(2), B(2), C(2)

DataTable (NTUData,1,-1)

DataInterval (0,1,min)

Sample (1,NTU)

Sample (1,NTU_SD)

EndTable

BeginProg

n = 10

A(1) = -0.24763

B(1) = 105.69

C(1) = -0.29928

A(2) = 35.310

B(2) = 401.11

C(2) = 0.20709

Scan (5,Sec)

Battery (Batt_volt)

SWBatt (1 )

Delay (2,sec)

NOTE

B-2

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 53 54

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