Xylem Lab 850, starting from serial number 09470315 User Manual

Page 24

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Operation

Lab 850

24

ba75890e01

11/2009

Note
The buffer set is selected in the menu for measurement settings (see
page 45).A list of the stored buffer sets can be downloaded to the
interface (Set 1 ... 16) with <CAL

_

> while selecting the buffer set in

the menu for measurement settings.

Calibration points

Calibration can be performed using one, two or three buffer solutions in
any order (single-point, two-point or three-point calibration). The meter
determines the following values and calculates the calibration line as
follows:

Note
You can display the slope in the units, mV/pH or %.
You can display the zero point in the units, mV or pH.

AutoCal

is adapted to the permanently programmed buffer solutions as a fully
automatic single-, two- or three-point calibration. The buffer solutions
are automatically recognized by the meter.

Stability control

The calibration procedure automatically activates the stability control
function.
The current measurement with stability control can be terminated at
any time (accepting the current value) by pressing <OK>.

Calibration record

When finishing a calibration, the new calibration values are first
displayed as an informative message and stored. )

Determined
values

Displayed calibration data

1-point

ASY

z Zero point = ASY
z Slope = Nernst slope

(-59.2 mV/pH at 25 °C)

2-point

ASY
SLO

z Zero point = ASY
z Slope = SLO

3-point

ASY
SLO

z Zero point = ASY
z Slope = SLO

The calibration line is calculated
by linear regression.

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