SATO 6433-00, Инструкция по эксплуатации, Страница: 8 / 16

6
. Calibration mode
By performing the 3-point calibration, this instrument can accurately measure the pH values. It is recommend
more accurate measurement, calibration of about once a day is recommended.
Before calibration, 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
 Beakers (each beaker to contain one type of standard solution and water (distilled, pure or tap water)
* Prepare the beakers for water as many as the standard solutions.
These standard solutions are separately purchased. Contact us or the shop where you purchased the
SK-670PHII.
(1) How to calibrate the SK-670PH pH meter
① Press the PWR key to turn on.
②
Remove the glass electrode protection bottle and wash the glass electrode thoroughly with water
(distilled, pure or tap water) and wipe clean the water on the glass electrode. After washing, use clean
filter paper, cotton swabs or tissue paper to absorb the water off the glass electrode.
NB: When washing the glass electrode, be careful not rub it. Doing so could generate static electricity
resulting in unstable pH readings.
③
Immerse the glass electrode into a standard solution. Approx. pH value will be displayed. Then,
slowly stir the solution with the electrode, and then hold the unit still.
* For more accurate pH measurement, perform the calibration on pH 7, pH 4 and pH 10 in due order.
④ Press the CAL key to enter the calibration mode. The unit automatically recognizes the calibration point
and the display the pH value of the calibration point. The current liquid temperature value is displayed
at same time.
When the liquid temperature of pH 7 standard solution is 25°C
The table below shows the pH value range to be set for calibration.
Calibration point Default value Setting range
pH 4 4.00 3.50 to 4.50
pH 7 7.00 6.50 to 7.50
pH 10 10.00 9.50 to 10.50