9
For accurate calibration, use two beakers for each buffer solution; the
first for rinsing the electrode, the second for calibration. In this way,
contamination of the buffer is minimized.
Note: The electrode should be submerged approximately
4 cm (1½") into the solution.
If you need to calibrate to NBS standards, use pH6.86 (HI7006)
and pH9.18 (HI7009) instead of pH7.01 and 10.01 respectively.
Use a
ChecktempC
or a glass thermometer as reference.
Put the beakers with the calibrations solutions on the beaker holders
on the top of the instrument.
PROCEDURE
• Switch the instrument on by pressing the
ON/OFF
switch.
• Rinse and immerse the pH electrode into pH7.01
buffer and shake briefly. Wait for the reading to
stabilize.
• Note the temperature of the buffer solution using a
ChecktempC
or a glass thermometer (e.g. 20 °C).
• Press and hold the
Temp
key to select temperature
setting.
• Adjust the
Temperature
knob until the LCD shows
the noted temperature.
• Release the
Temp
key. The instruments returns to
pH range.
If you are measuring in the acid range,
use pH4.01 as second buffer; if you are
measuring in the alkaline range, use
pH10.01 as second buffer.
