Automatic Buffer Recognition (Only Sg98); Dissolved Oxygen (Do) Calibration With The Inlab® Optiox - Mettler Toledo SevenGo Duo Pro Instrucciones De Manejo

5 Repeat the steps b - d for all calibration buffers.
6 Press End to end the calibration procedure.
Alternatively, the meter ends the calibration automatically when 5 calibrations are per-
formed. The offset value and slope are shown on the display.
7 Press Save to keep the calibration.
8 Press EXIT to reject the calibration.
Up to 5 calibrations can be saved for a dedicated sensor ID. The oldest calibration data is auto-
mat i c al l y overwritten with the current calibration data.
4.8.3 A utomatic buffer recognition (only SG98)
The meter features automatic pH buffer recognition for the predefined buffer groups (see "Appen-
dix"). The buffers within a buffer group are automatically recognized by the meter and displayed
dur i ng calibration.
This feature allows the calibration in any order within a predefined pH buffer group.
There is no automatic pH buffer recognition for customized buffer groups; in this case, the defined
order of the buffers needs to be followed.
4.8.4 D issolved oxygen (DO) calibration with the InLab® OptiOx
Under equilibrium conditions, the partial pressure of oxygen in air-saturated water is equal to the
par t ial pressure of oxygen in water-saturated air. This means that an OptiOx sensor calibrated in
water-saturated air will correctly read the partial pressure of oxygen in water samples. When mea-
sur i ng low concentration samples (less than 1 mg/L), a second calibration with a zero oxygen
stan d ard may be done.
Performing a one-point calibration
The first point of a DO calibration is always done in water-saturated air (100% O
1 Remove the OptiOx calibration tube cap and remove the sponge from the cap.
2 Saturate the sponge with distilled water and squeeze the excess water out of the sponge.
3 Reassemble the OptiOx calibration tube.
4 Make sure that no water droplets are on the surface of the OptiOx sensor cap.
5 Slide the calibration tube over the front of the sensor until the calibration tube is firmly con n ect-
ed to the sensor.
6 Allow at least five minutes for the temperature to stabilize prior to calibration.
7 Press and hold MODE for 3 seconds to switch to single channel measurement screen when in
dual channel measurement (only SG98).
8 Press CAL.
Cal 1 appears on the display.
The meter endpoints according to the preselected endpoint mode, automatically after the
sig n al has stabilized or after pressing READ. The standard value is shown on the display.
9 Press End to accept the calibration and return to sample measurement.
The calibration result is shown on the display.
10 Press Exit to reject the calibration.
20 Operating the pH/ORP/Ion/DO meter SG98 and DO meter SG9
51710917_V02.2011_BA_SG9_98_EnFrEs.indb 18
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