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To ensure the most accurate readings, you should perform calibrations regularly.
Running Direct Calibration
Ensure that the appropriate buffers/standards have been selected.
1 Select an appropriate method according to [Selecting a method Page 14].
2 Select a sensor if necessary according to [Selecting a sensor Page 14].
3 Tap Calibration.
4 Tap Start calibration.
5 Enter the lot number if Methods > Calibration > Check buffer lot number is checked and confirm with OK.
The sensor name, the endpoint type and buffers/standards points are displayed.
6 Place the sensor in a calibration buffer/standard.
7 Tap Read.
The font of the measurement values turns to light blue.
8 The measurement stops when the endpoint criterion is fulfilled. See [Endpoint criterion Page 16].
appears in front of the passed calibration point.
9 Rinse the sensor with deionized water and place the sensor in the next calibration buffer/standard.
10 Tap Read.
The font of the measurement values turns to light blue.
11 The measurement stops when the endpoint criterion is fulfilled. See [Endpoint criterion Page 16].
appears in front of the passed calibration point.
12 Rinse the sensor with deionized water and repeat the steps with all buffers/standards.
A window pops up with calibration data.
13 Tap OK (Adjust) to save the result.
- or -
Tap Reject to reject the calibration and return to Home screen.
Finalize a Calibration in Advance
If Home screen > Menu > Settings > Analysis settings > Finalize pH calibration at any point is active, a
button Calculate will display for the multi-point pH calibration. You can tap it to finalize the calibration in
advance.
To finalize the calibration in advance, proceed as follows:
Analysis settings is active.
The calibration is a multi-point pH calibration.
At least one calibration point of a multi-point calibration is passed.
1 Tap Calculate.
2 Tap OK (Adjust) to save the result.
- or -
Tap Reject to reject the calibration and return to Home screen.
The meter will do calibrations in the user-defined order in the active method. If one calibration point fails, you
should redo this calibration point and cannot skip it.
However, if Auto buffer recognition of a pH method is active, the meter will automatically recognize the closest
calibration point.
5.4 Starting a verification
The latest verification data will be stored into the data of the active sensor.
Ensure that the appropriate buffers/standards have been selected.
1 Select an appropriate method according to [Selecting a method Page 14].
2 Select a sensor if necessary according to [Selecting a sensor Page 14].
3 Tap Verification.
SevenDirect™ SD20
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