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4.2 Calibration of the pH meter.
The calibration of the pH meter is recommended if exact measured
values are required, the device has not been used for a long time or
if the device has been used for a longer period of time.
To calibrate the device, a buffer solution is required which has a pH
of 7.01 at room temperature.
To calibrate the area, remove the protective cap from the probe, fill
the buffer solution in a container and immerse the lower 4 cm of the
probe in the buffer solution.
Now move the pH meter carefully and slowly in the solution for a short
time. After a short time, the device settles to a measured value. When
this has been done, the value can be adjusted to exactly 7.01 using
the calibration screw. To check the pH meter, another buffer solution
with a pH of 4.01 is included in the scope of delivery.
After the calibration is done, clean the probe with distilled water and
dry the probe with a cloth.
5. Battery replacement
The PeakTech 5305 is a battery operated measuring device. After a
certain period of use of the device, it may happen that the capacity
of the batteries is used up and new batteries have to be inserted. This
becomes visible when the display gets darker or looks a little blurry.
To change the batteries, make sure that the device is switched off.
Remove the upper screw cap of the device and remove the batteries
from the battery compartment. Now insert the new batteries of the
appropriate polarity (which is shown in the housing) into the battery
compartment. Make sure to use the correct batteries that the
measuring device requires (4 x 1.5V AG13 button cells).
After changing the battery, put the screw cap on the device and screw
it back on.