Mettler Toledo M400 Especificações descarregar pdf (Página 34)

Transmitter Multiparameter M400 34

Printed in Switzerland 52 121 378

The calibration of an optical sensor is always a calibration of the phase of the ﬂuorescence

signal towards the internal reference. During a one point calibration (Air or zero) only the phase

at this point is measured and the phase at the other point (Air or Zero is internally calculated.

A zero-point calibration is only recommended if high accuracy at low oxygen level (below 5%

Air) is needed.

Select 1 point followed by either Slope (Phi 100) or ZeroPt (Phi 0) as the calibration type.

Press [ENTER].

Enter the value for Point 1 including a decimal point and units. The value in the second text line

is the value being measured by the transmitter and sensor in the units selected by the user.

Press [ENTER] when this value is stable to perform the calibration.

After the calibration the slope calibration factor S (Phi 100) and the offset calibration factor Z

(Phi 0) are displayed.

After a successful calibration, the calibration values are taken over and stored in the cal history

(Adjust), only stored in the cal history (Calibrate) or aborted.

7.3.2 Two Point Sensor Calibration (only available for Optical Sensors)

A 2-points calibration is a combination of ﬁrst a calibration in air (100%) where a new phase

P100 is measured and then a calibration in nitrogen (0%) where a new phase P0 is measured.

This calibration routine gives the most accurate calibration curve over the whole measuring

range.

7.3.3 Process Calibration

Enter Oxygen Calibration mode as described in section 7.1.

Select Process followed by either Slope or ZeroPt (Phi 100 or Phi 0) as the calibration type.

Press [ENTER]

Take a sample and press the [ENTER] key again to store the current measuring Value. To show

the ongoing Calibration Process, A or B (depending on the channel) is blinking in the display.

After determining the O

Value of the Sample press the  key again to proceed with the

calibration. Enter the O

value of the sample then press the [ENTER] key to start calibration.

After a successful calibration, the calibration values are taken over and stored in the cal history

(Adjust), only stored in the cal history (Calibrate) or aborted.

During a process calibration of an optical Sensor the phase of the ﬂuorescence light at a point

between 5% and 100% air is measured and the phases at 100% and 0% are calculated to

determine a new calibration curve.

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Mettler Toledo M400 Especificações Página 34