SATO SK-640PH, Инструкция по эксплуатации, Страница: 8 / 19

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Before measuring
(1) Connect the PHP-31 sensor probe to the main unit.
(2) Press the PWR key. The whole LCD lights up for three seconds to indicate that the unit has been
turned on.
When the temperature of the sample liquid is known, disconnect the temperature sensor
connecting plug and press the SKIP key for two seconds or more to enter the manual temperature
setting mode. Set the temperature to the desired reading by u
sing the pH/mV key (↑) or the
key (↓). Press the REC key to confirm.
(3) Perform the pH calibration after changing the battery or when a very accurate pH measurement is
necessary.
Calibration mode
By performing the 3-point calibration, this instrument can accurately measure the pH. Perform the pH
calibration in the following cases:
a) After replacing the sensor probe
b) After replacing the battery
c) When very accurate measurement is necessary
For more accurate measurement, calibration of about once a day is recommended.
For calibrating the SK-620PH, prepare the following items.
pH 4 standard solution (phthalate solution): pH 4.01 (at 25°C)
pH 7 standard solution (neutral phosphate solution): pH 6.86 (at 25°C)
pH 10 standard solution (carbonate solution): pH 10.01 (at 25°C)
Distilled water, pure water or tap water
Four beakers (each beaker to contain one type of standard solution or water (distilled, pure or tap
water)
To ensure accuracy, perform calibration at the same temperature as the material to be measured.
The pH standard solution bottle which comes with the instrument can be used as a substitute for a
beaker.
How to calibrate the SK-620PH series pH meter
(1) Connect the PHP-31 sensor probe to the main unit.
(2) Press the PWR key to turn on the unit. The unit enters the measurement mode. Remove the glass
electrode protection bottle from the sensor probe.