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2 INTENDED USE
2.1 Operating limitations
2.1.1 The pH-meter is used to measure hydrogen-ion activity index (from 0 to
12 pH), temperature of aqueous solutions (from 0 to plus 70
С), and U (from
minus 1.000 to plus 1.000 mV).
2.1.2 When working with pH-meter, protect electrodes and convertor unit
from shocks since fragile materials have been employed in their design.
2.1.3 On pH measurements electrodes are to be immersed in a solution at
least 16 mm deep.
2.1.4 Electrolyte level in electrodes on measurements is to be above the
analyzable solution level.
2.1.5 Avoid pH, U and temperature measurements in solutions containing
hydrofluoric acid or salts thereof and substances that form deposits and films on
electrode surfaces as well as operation and storage of dry electrodes.
2.1.6 Avoid PC output short-circuit.
2.2 Safety Precautions
2.2.1 Electric safety of operating personnel is ensured due to use of self-
contained DC power supply of voltage from 2.2 to 3.4 V.
2.2.2 The pH-meter is to be operated by people who acquainted themselves
with this manual and safety rules for handling reagents.
2.3 pH-meter preliminary operating procedures
Before use unpack pH-meter, check components and make sure that the
apparatus is free of damage.
If the pH-meter stayed in cold environment, keep it at room temperature for
at least 8 h and then start preliminary operating procedures.