ProMinent DULCOMETER pH/mV/Pt 1000 Mode D'emploi page 37

6.4.4
If errors occur after calibrating buffer 1 or buffer 2, respectively, these are
signalled by flashing LCD markers. The calibrating set buffer value remains on
the LCD display until the error is confirmed by pushing the "pH/mV/°C" key.
Error
No.
0
1
2
3
4
5
6
7
®
ProMinent
Error messages during calibration
LCD Error text
marker
∆pH
zero point pH < 5.5
or > 8.5
% slope < 75 %
or > 105 %
∆pH + %
adjusting time too long
cal + °C
temperature sensed
by Pt 1000 probe
during calibration is
too high/low
P1 wrong buffer 1
P2 wrong buffer 2
P1 + P2 buffer distance
too small
pH measuring range pH
exceeded
Operation
Description
Corresponding pH value at an
input of 0 mV.
Slope in % of the standard
slope of 59.16 mV/pH at
25 °C.
The averaged measured value
changes after 60 sec for more
than 2 mV per sec.
This error is only generated if
a temperature probe is con-
nected: calibrating tempera-
ture is less than 0 °C or more
than 100 °C.
The measured value is com-
pared to the pH value, which
is to be expected theoretically.
If the measured value is differ-
ent from the theoretical value
by more than pH 1.50, the
error message is activated.
Same as error no. 4, but for
the second buffer.
pH values of buffers differ by
less than 2 pH.
The pH value to be displayed
is more than pH 14.00 or less
than pH 0.00.
37