User Guide

HI 7007

CALIBRATION

HI 7007

RINSE

For accurate calibration, use two beakers for each buffer

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

one for calibration. By doing this, contamination between

the buffers is minimized.

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

you measure acidic samples, or pH 7.01 and pH 10.01 for

alkaline measurements or perform a 3-point calibration for

the entire range.

One Point Calibration (Offset)

• To perform the pH calibration enter

the calibration mode, by pressing

CAL and entering the password.

• After the correct password is entered,

the control actions stop and the pri-

mary LCD will display the pH value

using the current offset and slope,

with the "CAL" and "

BUF

" indicators lit

and the probe indicator " " blink-

ing. The value displayed on the

secondary LCD is the buffer value

at the actual temperature.

Note The actual pH value varies with temperature, thus the cali-

bration value displayed on the secondary LCD will vary around

pH 4.01, 7.01 and 10.01 with temperature changes: for ex-

ample at 25

C the display shows 4.01 - 7.01 - 10.01, at 20

C it shows 4.00 - 7.03 - 10.06 (see page 57 for other val-

ues).

• pH 7.01 is the default value for

the 1

calibration buffer. If a dif-

ferent value is needed, select it

on the secondary display by

pressing  or .

Note If the wrong password is entered the system reverts back and

restarts displaying the pH value.