Mettler Toledo M400/2(X)H Specifikace stáhnout pdf (Strana 41)

Transmitter M400/2(X)H, M400G/2XH 41

Printed in Switzerland 30 031 683

After the calibration the slope ”S” and the offset value ”Z” 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.

7.4 pH calibration

For pH sensors, the M400 transmitter features one-point, two-point (Auto or Manual mode) or

process calibration with 9 preset buffer sets or manual buffer entry. Buffer values refer to 25 °C.

To calibrate the instrument with automatic buffer recognition, you need a standard pH buffer

solution that matches one of these values. (See section 8.2.3.3 “pH/ORP parameters” for

configuring modes and selecting buffer sets.) Please select the correct buffer table before using

automatic calibration (see chapter 19 “Buffer tables”).

NOTE: For dual membrane pH electrodes (pH/pNa) only buffer Na+ 3.9M (see section 19.2.1

“Mettler-pH/pNa buffers”) is available.

7.4.1 One point calibration

Enter pH calibration mode as described in section 7.1 “Enter Calibration Mode”.

Select 1 point Calibration. With pH sensors a one point calibration is always performed as a

offset calibration.

Depending on the parameterized Drift control (see chapter 8.2.3.3 “pH parameters”) one of the

two following modes is active.

7.4.1.1 Auto mode

Place the electrode in the buffer solution and press the [ENTER] key to start the calibration.

The display shows the buffer the transmitter has recognized (Point 1) and the measured value.

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 110 111

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Mettler Toledo M400/2(X)H Specifikace Strana 41