Metrohm 827 pH lab User Manual download pdf (Page 55)

8 Troubleshooting – Messages – Maintenance

826/827 pH meter, Instructions for Use 47

Message Situation Cause Remedy

same buffer calibration Potential difference be-

tween 1

and 2

buffer is

less than 6 mV

1. Change buffer

2. Press

<ENTER>

----.-

overrange

Mode pH/U/T Measuring range ex-

ceeded

Remedy error or change

mode

8.3 Diagnosis

The pH meter is equipped with a diagnosis program. This allows selec-

tive checks of the functions of individual assemblies.

The diagnosis is called up by pressing down and holding down the

<OK> key while switching on the pH meter. Only those tests that you

can carry out yourself are described below; the other functions are re-

served for Metrohm Service personnel.

If one of the following tests is concluded with an error message, please

note it down and contact your local Metrohm agency.

Attention!

You are expressly warned against triggering any other functions than

those listed and documented below. Improper use can disturb the

correct functioning of the pH meter and may render it unusable.

diagnose

├ RAM init

├ EEPROM init

├ AD converter test

├ LC display test

├ key test

RAM init

The initialization of the instrument memory can be a good idea if you

want to return parameter and configuration settings to their original

condition.

Note!

The calibration data as well as the measured values memory won't be

deleted with a RAM initialization.

EEPROM init

The calibration data and the measured values memory are deleted with

an EEPROM initialization.

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