Campbell CS526 Manual descargar pdf (Pagina 8)

CS526 ISFET pH Probe

4. Quickstart

For complete installation, programming, and calibration information, see

Sections 7 through 9.

The CS526 is shipped dry. Before the probe can be calibrated, it must be

soaked in 7 pH buffer solution for 15 minutes. Follow the calibration

procedure outlined in Appendix A.

Unlike many glass-bulb type pH sensors, the CS526 ISFET pH probe can be

installed without regard to orientation. Connect the CS526 to the datalogger

according to the following table. Be sure to connect Red to the 5V channel.

Wire Color Datalogger Connection

Red (Caution! 5 Vdc Max!) 5V

Black G

White Control Port (Tx)

Green Control Port (Rx)

Clear G

Program the datalogger as follows.

'CR1000 Series Datalogger

'Declare variable for PH measurement in mV

Public pHmV

'Declare variables for serial input from sensor

Dim rawstring As String * 20, pHDigit(2)

'Main Program

BeginProg

'Set up one of the datalogger's ports for serial communication

SerialOpen ( Com1,2400,16,0,41)

'Establish program scan rate of 60 seconds

Scan (60,Sec,0,0)

'Send get data command to CS526

SerialOut (Com1,"1M1!"&CHR(13),"",0,0)

'Set up COM1 to receive incoming serial data.

'Set timeout to maximum 200mS

SerialIn (rawstring,Com1,20,0,20)

'Split out numeric mV value for PH from string input

SplitStr (pHDigit(),rawstring,"String",2,0)

pHmV = pHDigit(2)

NextScan

EndProg

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Campbell CS526 Manual Pagina 8