Mettler Toledo M400/2(X)H Dokumentacja Pobierz pdf (Strona 38)

Transmitter M400/2(X)H, M400G/2XH 38

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7.2.3 Process Calibration

(Display reflects typical Conductivity sensor calibration)

Enter Conductivity Sensor Calibration mode as described in section 7.1 “Enter Calibration Mode”

and choose one of the compensation modes (see section 7.2 “Conductivity calibration for two-

or four electrode sensors”).

Select Process Calibration and press [ENTER]. With conductivity sensors a process calibration

is always performed as a slope calibration.

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

During the ongoing calibration process, the letter of the channel, which is concerned by the cali-

bration, “A” or “B” is blinking in the display.

After determining the conductivity value of the sample, press the [CAL] key again to proceed

with the calibration.

Enter the conductivity value of the sample, then press the [ENTER] key to start the calculation of

calibration results.

After the calibration the Multiplier or slope calibration factor “M” and the Adder or offset calibra-

tion factor “A” are displayed.

In case of a successful calibration, the calibration values are stored in the cal history* and taken

over (Adjust), stored in the cal history* and not taken over (Calibrate) or discarded (Abort).

* only available with ISM sensor. The values will be stored in the sensor.

If “Adjust” or “Calibrate” are chosen, the message “Calibration successful” is displayed. The

M400 returns to the measuring mode.

7.3 Calibration of amperometric oxygen sensors

Oxygen calibration for amperometric sensors is performed as either a one-point or process

calibration.

NOTE: Before air calibration, for highest accuracy, enter the barometric pressure and relative hu-

midity, as described in section 8.2.3.4 “Parameters for oxygen measurement based on ampero-

metric sensors”.

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Mettler Toledo M400/2(X)H Dokumentacja Strona 38