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(2) Press the PWR key to turn on the unit. The whole LCD lights up for approximately three seconds. The unit
enters the measurement mode.
(3) Remove the glass electrode protection bottle from the sensor probe.
(4) Immerse the sensor probe at least 3 cm deep into the material to be measured.
(5) Read the pH value when the reading becomes stable.
(6) To display the voltage, press the pH/mV key. The voltage detected by the sensor probe is displayed.
(7) To end the measurement, press the PWR key to turn off the unit.
Wash the glass electrode with water (distilled, pure or tap water), install the glass electrode protection
bottle and store the instrument.
Note: For how to install or remove the glass electrode protection bottle, refer to "Glass electrode protection
bottle".
About the glass electrode
(1)
Storage
If left unused for a long time, the glass electrode becomes too dry to measure the pH accurately.
The pH electrode works best and shows accurate readings when used with moderate moisture. When
using the instrument for the first time after purchasing or a long storage period, we recommend placing the
glass electrode in water (distilled, pure or tap water) or the pH standard solution for at least 12 hours and
performing calibration before measuring. For everyday storage, fit the glass electrode protection bottle to
the sensor probe. The glass electrode protection bottle is filled with the phthalate standard solution (pH 4)
at the factory.
(2)
Inspection and calibration
For an accurate pH measurement, perform calibration using the pH standard solution.
If there is a deviation from the expected value, adjust it before performing a pH measurement.
Note that there are cases where the pH value of the standard solution has changed from its original value.
This can happen if the pH standard solution is dirty or if storing the solution for a long time. It is advisable to
use a new pH standard solution, where applicable.
(3)
Washing
Be sure to wash the pH electrode after each pH calibration or measurement with water (distilled, pure or
tap water). If left unwashed, the liquid measured tends to form a film on the surface of the electrode,
causing measurement errors. Always wash the pH electrode every time after use.
Washing can be done with water (distilled, pure or tap water) in most cases, but if there is a stubborn stain,
use neutral detergent diluted in water to wash only the glass electrode section (spherical part). After using
neutral detergent, thoroughly rinse the electrode with water (distilled, pure or tap water) to remove the
neutral detergent, and then immerse the electrode in the pH standard solution (pH 4) before measurement.
Note that neutral detergent cannot be used on the liquid junction of the sensor probe. Otherwise, the
performance of the inner solution could be damaged if the neutral detergent penetrates inside the sensor.
(4)
Useful life
It is not possible to replenish or repair the inner solution of the sensor probe.
The pH electrode is a consumable. Its useful life varies depending on the liquid to be measured, pH value
or temperature.
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