Mettler Toledo M300 ISM Dokumentacja Strona 43

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Transmitter M300 43
© 12 / 11 Mettler-Toledo AG, CH-8606 Greifensee, Switzerland Transmitter Multiparameter M300
Printed in Switzerland 52 121 389
7.3 OxygenCalibration
Dissolved Oxygen calibration is performed as either a one-point or process calibration.
7.3.1 One-PointSensorCalibration
Before air calibration, for highest accuracy, enter the barometric pressure and relative humidity
as in section 8.2.4.3 “Dissolved Oxygen Parameters” described
Enter Oxygen Calibration mode as described in section 7.1 “Enter Calibration Mode”.
A DO sensor calibration is always either a one point Air (Slope) or a Zero (Offset) calibration. A
one point slope calibration is done in air and a one point offset calibration is done at 0 ppb DO.
A one-point zero dissolved oxygen calibration is available but not normally recommended since
zero DO is very hard to achieve.
Select 1 point followed by either Slope or ZeroPt as the calibration type. Press [ENTER].
Place the sensor in the calibration gas (e.g. air) resp. solution. Press [ENTER].
7.3.1.1 Automode
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NOTE: For a zero point calibration the Auto mode is not available. If Auto mode has been config-
ured (see section 8.2.4.3 “Dissolved Oxygen Parameters”) and an offset calibration will be exe-
cuted, the transmitter will perform the calibration in Manual mode.
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.
As soon as the stabilization criteria have been fulfilled the display changes. The display shows
the calibration result for slope ”S” and offset value ”Z”.
Select Yes to save the calibration values and the successful Calibration is confirmed on the dis-
play. If an ISM sensor is connected, the calibration data will be stored in the sensor.
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