User Guide

It is recommended to calibrate the instrument frequently, especially if

high accuracy is required.

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) If greatest accuracy is required.

e) Whenever the batteries have been replaced.

PREPARATION

Pour small quantities of pH 7.01 and pH 4.01 solution into two clean

beakers.

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

first one for rinsing the electrode and the second one for calibration.

This way the contamination of the buffers is minimized.

To obtain accurate readings, use pH 7.01 and pH 4.01 buffers if you

are going to measure acidic samples, or pH 7.01 and pH 10.01 for

alkaline measurements.

PROCEDURE:

In order to calibrate the meter, there is a choice of 5 memorized

buffers: 4.01, 6.86, 7.01, 9.18 and 10.01 pH.

• Make sure that the meter is in the pH mode.

• Remove the protective cap and rinse the electrode with some of

the buffer calibration solution that you are going to use first.

ONE-POINT CALIBRATION:

It is always recommended to perform a two-point calibration for

optimum accuracy. In case of necessity, it is possible to carry out only

a one-point calibration with the instruments. The offset buffers, that is

HI 7004 HI 7007

HI 7004

HI 7007

CALIBRATION

HI 7007

RINSE

H CALIBRATIONH CALIBRATION

H CALIBRATION