User Guide

Slope adjustment

• Rinse the electrode and the ground probe

thoroughly with water and immerse the

bottom 4 cm (1.5") in a pH10.01 (HI 7010)

or a pH4.01 (HI 7004) buffer solution.

• Stir the electrode and wait for the reading

to stabilize before adjusting the SLOPE trim-

mer to display the correct pH value at the

measured solution temperature; e.g. 4.01

(or 10.01) at 25°C (77°F). See the “pH

VALUES AT DIFFERENT TEMPERATURES” sec-

tion.

The pH calibration is now complete.

CONDUCTIVITY CALIBRATION

To calibrate the controller, first set it in measurement mode by pressing

the MEA button (the MEA LED lights up).

Make sure the conductivity probe has been properly connected and wired

to the controller and the meter is plugged to the mains.

The calibration should be performed at a temperature similar to that of

the liquid to be monitored.

Slope adjustment

• Pour in a beaker a solution of known conductivity value, which should

be close to the sample stream to be monitored. For example, if

measurements are in the 1.2 to 2.5 EC range, choose HI 7031 (1.41

mS/cm @25°C). Similarly, if measurements are in the 4 to 6 mS/cm

range utilize HI 7031 or HI 7039 (5.00 mS/cm @25°C).

• Immerse the probe in the beaker ensuring that the holes on the probe

sleeve are completely covered.