Ph buffer temperature dependence – Hanna Instruments HI 84430 User Manual
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• If the measured offset isn’t within the preset limits the meter will display the message “Buffer
Contaminated” alternatively with ”Electrode Dirty/Broken”.
• If the computed slope isn’t within the preset limits the meter will display the message “Wrong
Slope”. If the slope is too high the symbol
will be displayed. If the slope is too low the
symbol
will be displayed.
• If the “Wrong Old Slope” error message is displayed, an inconsistency exists between the
current and the previous (old) calibration. Clear the calibration parameters by pressing Clear
and proceed with calibration from the current calibration point. The instrument will keep all the
confirmed values during the current calibration point.
• If the temperature reading is out of the defined temperature range of the buffer (0 to 45°C)
the “Wrong Buffer Temperature” error message will be displayed, and the symbol °C will
blink on the display. Calibration cannot be confirmed in this situation.
The temperature has an effect on pH. The calibration buffer solutions are affected by temperature changes
to a lesser degree than normal solutions. During calibration the instrument will automatically calibrate to
the pH value corresponding to the measured or set temperature.
During calibration the instrument will display the pH buffer value at 25
°
C.
pH BUFFER TEMPERATURE DEPENDENCE
P
M
E
T
S
R
E
F
F
U
B
H
p
C
°
F
°
8
6
.
1
1
0
.
4
0
3
.
8
0
2
3
7
6
.
1
1
0
.
4
8
4
.
8
5
1
4
7
6
.
1
0
0
.
4
4
4
.
8
0
1
0
5
7
6
.
1
0
0
.
4
1
4
.
8
5
1
9
5
7
6
.
1
0
0
.
4
7
3
.
8
0
2
8
6
8
6
.
1
0
0
.
4
3
3
.
8
5
2
7
7
8
6
.
1
1
0
.
4
0
3
.
8
0
3
6
8
8
6
.
1
2
0
.
4
7
2
.
8
5
3
5
9
9
6
.
1
3
0
.
4
4
2
.
8
0
4
4
0
1
9
6
.
1
4
0
.
4
1
2
.
8