Calibrating the ph electrode, One-point calibration, Preparation – Hach-Lange SENSION+ MM110 User Manual
Page 14: Operation, Fig. 6. preparation
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5. Operation
5.3.2. One-point calibration
Stir gently holding the sensor by the handle. Do not hold it by the tube to avoid
heating of the buffer solution.
Follow the diagram on the next page.
One-point calibration is acceptable when pH values around that of the buffer
used are being measured.
One-point calibration only corrects the asymmetry potential of the electrode.
Notes: If the measuring instrument is not used for 5 minutes, it shuts off
automatically.
If errors occur during calibration, an error message will appear on screen
(see pg. 19).
Fig. 6. Preparation
5.3. Calibrating the pH electrode
Important note: Before turning on the instrument, check that the sensor is connected
The instrument must be calibrated before taking the first pH reading.
The calibration can be performed of 1, 2 or 3 points.
5.3.1. Preparation
1. Fill the tubes with the buffer solutions (note the fill level).
2. Unscrew the protector containing the electrolyte and wash the sensor with deionized water.
3. Screw the sensor on to the tube containing the first buffer.
5 ml
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94
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LZW94
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1
2
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sensION+ MM110 HACH_LANGE 0710.indd ANG:10
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