User Guide

CALIBRATION

pH CALIBRATION

For greatest accuracy, it is recommended to frequently calibrate the

instrument. For a faster procedure, it is possible to calibrate at 1

point, but it is always a good practice to calibrate at 2 points.

For a two-point calibration two of the following pH buffers can be

used: pH 4.01, pH 7.01 (or 6.86), pH 10.01 (or 9.18).

In the case of a two-point calibration in the acidic range (from 0 to

7 pH), use pH 7.01 (or 6.86) buffer as first solution and pH 4.01

buffer as second solution. If testing in the alkaline range (from 7 to

14 pH), use pH 10.01 (or 9.18) buffer as second solution.

Due to electrode conditioning time, the electrode must be kept

immersed a few seconds to stabilize. The meter is equipped with a

stability indicator and the user will be guided step by step with easy

indications on the LCD during the calibration. This will make the

calibration a simple and error-free procedure.

PROCEDURE

1. Rinse the electrode with a portion of the first calibration buffer or

clean water. Dip the tip (4 cm/1½") of the electrode into a

beaker containing the solution.

2. Press (ALT+) CAL when the meter dis-

plays pH measurement.

3. Enter the password (if different from "0000") with the arrow keys.

4. Press CFM to confirm the password or (ALT+) CAL to exit.

5. If password is correct, the meter displays "7.01pH" on the

secondary LCD with the "BUF 1" and "CAL" indications. The

primary LCD shows the uncalibrated pH reading.

Note: The pH buffer value (displayed on the secondary LCD) varies

with temperature. For example, at 20

C it shows 4.00 -7.03 -

10.06, at 25

C it shows 4.01-7.01-10.01.

6. Select the first buffer solution value with  or  if necessary.

7. When the "CFM" symbol blinks, the read-

ing is stable and calibration can be

confirmed.

8. Press CFM to confirm the first buffer.