User Guide

9. If everything is satisfactory the LCD will

display "Stor" and then the expected

value for the second buffer (two-point

calibration). If a wrong solution or elec-

trode has been used or if the buffer is

polluted, "WRONG" will be displayed to

alert the user.

10. If a single point calibration is required,

press (ALT+) CAL to exit the calibration

mode and maintain the previous slope

calibration. The instrument then checks

the electrode parameters and advises user

of possible abnormalities by "old probe"

and "dead probe" indications.

11. Press  or  to select the second buffer value. The meter will

display the "BUF 2" indication.

12. Rinse the electrode with some of the second buffer solution or clean

water.

13. Dip the tip (4 cm/1½") of the pH electrode into a beaker

containing the second buffer.

14. When the "CFM" symbol blinks, press CFM

to confirm the second calibration point.

15. The LCD will display "Stor". The instrument checks the electrode

parameters and advises the user of possible abnormalities by "old

probe" and "dead probe" indications (in these cases, repeat the

calibration procedure with fresh buffers). If everything is satisfactory

the meter is calibrated and it returns to normal operational mode.

Note: To abort the calibration procedure and leave the calibration data

unchanged, press ALT and CAL before confirming the first point.

CALIBRATION ERROR MESSAGES

If the "old probe" or "dead probe" messages are displayed, or if the

WRONG tag blinks during calibration, check the electrode by following

the conditioning and maintenance procedures and repeat calibration.

If calibration can not be successfully performed, the pH electrode

might have to be replaced.

Note: See "GLP" section for more details about "old probe" and "dead

probe" messages.