18
19
For manual temperature compensation during calibration, please
refer to the following chart.
pH VALUES AT VARIOUS
TEMPERATURES
For instance, if the buffer temperature is 25°C, the display should
show pH 4.01 or 7.01 or 10.01. With the temperature at 20°C, the
display should show pH 4.00 or 7.03 or 10.06. Likewise, at 50°C,
the display should show pH 4.06 or 6.98 or 9.82.
TEMP
pH VALUES
°C
°F
4.01
6.86
7.01
9.18
10.01
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
32
41
50
59
68
77
86
95
104
113
122
131
140
149
158
4.01
4.00
4.00
4.00
4.00
4.01
4.02
4.03
4.04
4.05
4.06
4.07
4.09
4.11
4.12
6.98
6.95
6.92
6.90
6.88
6.86
6.85
6.84
6.84
6.83
6.83
6.84
6.84
6.85
6.85
7.13
7.10
7.07
7.04
7.03
7.01
7.00
6.99
6.98
6.98
6.98
6.98
6.98
6.99
6.99
9.46
9.39
9.33
9.27
9.22
9.18
9.14
9.10
9.07
9.04
9.01
8.99
8.97
8.95
8.93
10.32
10.24
10.18
10.12
10.06
10.01
9.96
9.92
9.88
9.85
9.82
9.79
9.77
9.76
9.75
TAKING REDOX MEASUREMENTS
HI 8014
and
HI 8915
have the capability to take ORP measure-
ments, if using an optional ORP electrode.
Oxidation-reduction potential (REDOX) measurements provide the
quantification of the oxidizing or reducing power of the sample tested.
To correctly perform a redox measurement, the surface of the ORP
electrode must be clean and smooth.
When not in use, the tip of the electrode should be kept moist and
safe from any mechanical stress which might cause damage to the
glass-platinum junction.
TEMPERATURE CALIBRATION
HI 8915
and
HI 931000
have been accurately precalibrated for
temperature at the factory.
For optimum accuracy, it is recommended that you have your pH
meter recalibrated for temperature at least once a year.
Contact your Dealer or the nearest Hanna Customer Service Center for
more information.
mV OUTPUT
It is possible to attach the
HI 8915
to a recorder or plotter using the
mV output sockets.
pH, mV and °C readings can be transmitted through the output
sockets at a voltage that proportionally matches the displayed value.
For example, when the meter reads 2.00, 7.00 or 12.00 pH, it emits
a 200, 700 or 1200 mV signal, respectively.
This makes it unnecessary to use conversion tables and charts.
The output signals for the three measurement ranges of the meter are
100 mV for every pH unit, 1mV for every mV unit and 10 mV for
every degree centigrade.
DISPLAY CODES GUIDE
HI 8014 and HI 8915
°C
Symbol indicates the meter is in temperature mode.
pH
Symbol indicates the meter is in pH mode.
mV
Symbol indicates the meter is in mV mode.
HI 8915
S
Symbol to indicate the display is frozen (Hold function).
HI 931000
∆∆∆∆∆
Stability indicator
Ec
Wrong buffer: Change the buffer solution;
Unfit electrode: Clean and condition the electrode.
Eb
Low battery: Replace the battery.
Er
Over-Range: Dry electrode, repeat conditioning.
