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H CALIBRATIONH CALIBRATION

H CALIBRATION

For greatest accuracy, frequent calibration of the instrument is

recommended. The instrument should be recalibrated for pH:

a) Whenever the pH electrode or temperature probe is replaced.

b) At least once a month.

c) After testing aggressive chemicals.

d) Where extreme accuracy is required.

e) Whenever the battery has been replaced.

PREPARATION

Pour small quantities of pH 7.01 (HI 7007 or

HI 8007) and pH 4.01 (HI 7004 or HI 8004)

solution into two clean beakers.

For accurate calibration use two beakers for each buffer solution, the

first one for rinsing the tip of the electrode, the second one for

calibration. In this way contamination of the buffers is minimized.

To obtain accurate readings, use pH 7.01 (HI 7007 or HI 8007) and

pH 4.01 (HI 7004 or HI 8004) if you are going to measure acidic

samples or pH 7.01 (HI 7007 or HI 8007) and pH 10.01 (HI 7010

or HI 8010) for alkaline measurements.

If you need to calibrate HI 8014, HI 8314 and HI 8915 to NBS

standards, use pH 6.86 (HI 7006 or HI 8006) instead of pH 7.01

and pH 9.18 (HI 7009 or HI 8009) instead of pH 10.01.

PROCEDURE FOR HI 8014

• Remove the protective cap from the elec-

trode, rinse and immerse it in pH 7.01

buffer and stir gently. Wait a couple of

minutes for the reading to stabilize.

Note: the electrode should be submerged ap-

proximately 4 cm (1½") into the solution.

The ChecktempC should be located close

to the pH electrode.

• Take the temperature of the buffer solution

with a ChecktempC (or an accurate ther-

HI 7004 HI 7007HI 7004 HI 7007

HI 7004

HI 7007

RINSE

HI 7007

CALIBRATION

°C

HI 7007

4 cm

HOLD FUNCTION (HI 8915 ONLY)

The hold function is activated by the HOLD key. The measured value

is frozen on the display when this key is pressed. "S" symbol will

appear on the display to indicate the holding mode.

Press the same key again and the meter will return to its regular

operational mode.

AFTER MEASUREMENTS

After measurements switch the instrument off

to save battery.

For HI 9214: when not in use, disconnect the

electrode from the meter and cover the threaded

connector with the supplied protective cap.

OFF

°C

HOLD

Brand	Hanna Instruments
Model	HI 8424
Category	Digital multimeter
Language	English

Hanna Instruments HI 8424 User Manual

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Hanna Instruments HI 8424 Specifications

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