VOLTCRAFT KBM-110, Руководство по эксплуатации

Страница: 18 / 32

7 | Maintenance KBM-110
18 / 32 B-H86.0.12.DB214-1.0
For automatic calibration, open the
Calibration
menu. See Automatic pH calibration
[
}
p. 19] .
Prerequisite – The pH electrode and, if applicable, a temperature sensor are inserted in the
product.
– The product is switched on.
Instruction 1. Carefully remove the protective cap from the electrode.
2. Rinse off the electrode with distilled or deionised water.
Outcome of an action
Now, the product can be calibrated.
7.3.1.1 Explanation
The following steps describe how to calibrate the product.
To achieve a precise measurement, observe the following points.
NOTE
If possible, the calibration range should overlap the measuring range. To achieve this,
it is recommended to use buffer solutions for measurements as follows:
– below pH 7 uses pH 7.0 and pH 4.0 buffer
– above pH 7 uses pH 7.0 and pH 10.0 buffer
NOTE
Calibrations are only possible in a temperature range from 0 °C to 60 °C! We recom-
mend performing calibration at temperatures between 10 °C and 40 °C.
NOTE
Calibration should be conducted at the same temperature used for the measurement
in the medium. To equalize the temperatures of the buffer solutions and electrode,
they should be stored together for a while in a place that is protected against draught.
NOTE
If a temperature sensor is not connected, measure the temperature of the buffer solu-
tion with a thermometer. The exact value of the buffer solution is temperature depend-
ent and can be determined based on the tables provided.
NOTE
Always use fresh buffer solutions!
7.3.1.2 Buffer solutions
Description At least one buffer solution is required to calibrate the product. In the process, you
have the option of using a ready-to-use PHL buffer solution or mixing the solution
yourself with GPH buffer capsules - refer to the instructions.
Colour 10 °C 20 °C 25 °C 30 °C 40 °C
PHL 4.0 Red 4.02 4.00 4.01 4.01 4.01
PHL 7.0 Green 7.06 7.02 7.00 6.99 6.97
PHL 10.0 Blue 10.18 10.07 10.01 9.97 9.89