Error Messages; Other Messages - Hach LANGE si628 P Manuel D'utilisateur

6. Error messages

During calibration
On display
Asymmetry Potential
> 60 mV
Sensitivity
< 85 %
Sensitivity
> 103 %
Buffer solutions at
different temperature
Unstable reading
more than 1 min
SAME BUFFER
SOLUTIONS
UNKNOWN
BUFFER SOLUTION

Other messages

On display
OUT OF RANGE
°C OUT OF RANGE
L1 MEASURE L2
pH 12.34 38.5 °C
24
si628 P_HACH_LANGE_Ed.0510.indd ANG:24 si628 P_HACH_LANGE_Ed.0510.indd ANG:24
Problem
Electrode Asymmetry Potential
> 60 mV.
Electrode slope < 85 % of
theoretical value.
Electrode slope > 103 % of
theoretical value.
Buffers temperature.
Unstable reading for more
than 60 seconds.
1st and 2nd buffer solutions
are the same.
Incorrect buffer solution.
Problem
pH or mV measured value
out of range.
Measured temperature out
of range.
Measured value (pH or mV)
out of programmed limits L1
and/or L2.
Possible causes
Electrode "worn out".
Buffer solutions contaminated.
Electrode "worn out".
Buffer solutions contaminated.
Electrode "worn out".
Buffer solutions contaminated.
The temperature difference between both buffer
solutions used in calibration is > 3 °C.
Press ESC to quit.
Electrode defective or dirty.
Variation of buffer solution temperature.
(i.e. when stored previously in the refrigerator).
Same standard was used for both calibration steps.
Electrode is broken or cable defective.
Press ESC to quit.
The used buffer solution is not among the three
stored, pH 7.00, 4.01 or 9.21 at 25 °C.
Press ESC to quit.
Possible causes
pH value < 0 or > 14, mV < –1500 or > 1500.
After 1 min with this message on display the cur-
rent output will be frozen at 22 mA (Alarm).
Pt 1000 broken or temperature < –20 or > 150°C
After 1 min with this message on display the cur-
rent output will be frozen at 22 mA (Alarm).
Verify programmed values for L1 and L2.
Verify process evolution.
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