Xylem Lab 850, up to serial number 09470314 Manual de usuario descargar pdf (Pagina 20)

Operation Lab 850

ba75553e03 01/2006

4.3.1 Measuring the pH value

Stability control SC

(drift control)

The stability control function (drift control) checks the stability of the

measurement signal. The stability has a considerable effect on the

reproducibility of the measured value.

For identical measurement conditions, the following criteria apply:

Drift within 15 sec < 0.02 pH units.

Note

The current measurement with stability control can be terminated at

any time (accepting the current value) by pressing <OK>.

1 Perform the preparatory activities according to page 19.

2 Immerse the pH electrode in the test sample.

3 Using <MODE>, scroll as necessary until the measured

parameter pH is displayed.

1 If necessary, call up the measured variable pH with <MODE>.

2With <SC>, activate the stability control function.

The SC function display indicator appears.

The current measured value is frozen (hold function).

3 Start measurement with stability control with <OK>.

SC flashes until a stable measured value is reached.

This measured value is downloaded to the interface.

4 If necessary, start the next measurement with stability control

with <OK>.

5 To terminate the stability control function: Press the <MODE>

or <SC>

key.

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Xylem Lab 850, up to serial number 09470314 Manual de usuario Pagina 20