IMPORTANT
The instrument's pH range should be re-calibrated:
• When the meter is new.
• Whenever the pH electrode is replaced.
• At least once a month.
• After use in aggressive chemicals.
• After cleaning procedure and changing the reference electrolyte.
• For greatest accuracy.
PREPARATION
Pour small quantities (up to 4 cm / 1½"
level) of pH 7.01 (HI 7007) and pH
4.01 (HI 7004) or pH 10.01 (HI 7010)
solution into clean beakers (or 100 mL
bottles). If possible use plastic beakers to minimize any EMC
interferences.
If you are measuring in the acid range, use pH 4.01 as second
buffer; if you are measuring in
the alkaline range, use pH 10.01
as second buffer.
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.
Note: If you need to calibrate to NBS standards, use pH 6.86
(HI 7006) and pH 9.18 (HI 7009) instead of pH 7.01
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.
pH CALIBRATION
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