User Guide

4 cm

(1½")

HI 7007

CAL

5. “4” can be changed to “10” (indicating pH

10.01) by pressing BUFF button. If you are

measuring acid samples (pH 7 or less) use

the pH 4.01 buffer (HI7004). For alkaline

solutions (pH 7 or greater) use pH 10.01

(HI7010).

6. Rinse the electrode with clean water or some

pH4.01 (or 10.01) solution. Dip the bottom 4

cm (1½") of the electrode in a beaker con-

taining the second buffer.

7. When “4” (or “10”) stops blinking, indicat-

ing that the electrode has stabilized, wait

30 seconds and then press CFM again to

confirm the second calibration point.

8. The buffer reference disappears from the

secondary display and the meter is cali-

brated and ready to use.

9. If the buffer is incorrect or the electrode is

defective, E2 will blink to alert the user.

Repeat the calibration procedure from the

beginning with fresh buffers. If you cannot

complete the calibration, check your elec-

trode by following the conditioning and maintenance procedure

on page 29 and repeat calibration. The pH electrode might have

to be replaced if calibration cannot be successfully performed.

PH CALIBRATION HI 92240

1. Rinse the electrode with some pH 7.01

(HI7007) solution or clean water. Dip the

bottom 4 cm (1½") of the electrode and the

temperature probe into a beaker contain-

ing pH7.01 solution.

2. Press the CAL key. The secondary (lower)

LCD will blink “7” to indicate that pH

7.01 is expected and the electrode is

conditioning.

BUFF

4 cm

(1½")

HI 7004

CFM