Metrohm 827 pH lab - Manual (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
st and 2 nd buffer is
less than 6 mV
1. Change buffer
2. Press
----.-
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
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.