User's Manual

pH pH

CALIBRATIONCALIBRATION

CALIBRATION

Make sure that the pH electrode and any ground probe have been

properly connected and wired to the controller (see preceding pages)

and that the meter is plugged to the mains.

Calibration should be performed at a temperature similar to that of

the liquid to be monitored.

Use a Checktemp (or an accurate thermometer)

as reference.

Remove the electrode cap if it is still on the

electrode.

During calibration, move the electrode and the

separate ground probe (if in use) together from

one buffer to the next.

If no separate ground probe is being used, make

sure that the Reference and the Matching Pin

terminals are shorted (see 18 - Functional Dia-

gram).

If the electrode (such as HI 1003/3) incorporates a ground probe

(matching pin) then remove the jumper.

OFFSET ADJUSTMENT:

• Rinse the tip of the electrode with pH 7.01

solution (HI 7007), then dip the bottom 4 cm

(1.5”) of the electrode (and ground probe) in

the pH 7.01 buffer.

• Place the Checktemp thermometer in the buffer solution.

• Wait for the measurement to stabilize and then adjust the

"OFFSET" trimmer (see 7 - Functional Diagram) to display 7.01

on the LCD if the temperature of the buffer solution is at 25°C

(77°F).

4cm

(1½")

HI 7007

4cm

(1½")

HI 7007

OFFSET SLOPE

ALARM

OFF

7.01

4cm

(1½")

HI 7007