User Guide

The pH calibration can not be performed if the pH electrode

is broken or leaking or the reference electrode is broken or

dirty and an error is active. The ORP calibration can not be

performed if the “Reference electrode broken or dirty” error is

active. The temperature probe should be connected to the

instrument.

Initial Preparation

Pour small quantities of pH 7.01 (HI 7007) and pH 4.01

(HI 7004) or pH 10.01 (HI 7010) solutions into individual

beakers. If possible, use plastic beakers to minimize any EMC

interference.

For accurate calibration use different beakers for each buffer

solution, the first one for rinsing the electrode and the second

one for calibration. By doing this, contamination between

buffers is minimized.

• Enter the calibration mode, select

the pH calibration (by moving

through the menu with the  and

 keys), then press the CFM key.

• Choose the pH buffer set between the two available ones:

the standard set (4.01, 7.01, 10.01) and the NIST set (4.01,

6.86, 9.18). For the standard set confirm the “Std”; for the

NIST set confirm the “niSt” (use the  and  keys for select

between the two options).

The default buffer set is the one used for last calibration,

even if the procedure was not completed.

• Once confirmed the set of buffer val-

ues, the primary LCD shows the

measured pH value, while the second-

ary LCD displays the first required buffer

value.

Two-point calibration

• Remove the protective cap from the pH electrode and im-

merse it into the buffer solution (e.g. pH 7.01) together

with the Potential Matching Pin and the temperature probe,

then stir gently.