User Guide

22
compensate for it (HI 8424 and HI 9622 only). In this case, the
temperature probe must be disconnected. HI 8014 provides only for
manual compensation.
With HI 8314 and HI 8915 when the temperature probe is discon-
nected, the pH reading will be compensated at 25°C. If a different
compensation is required, reattach the probe.
MANUAL TEMPERATURE COMPENSATION FOR HI 8424
& HI 9622
If the temperature probe is out if order or if
temperature is to be set manually, unplug
the probe and record the temperature of the
sample with a ChecktempC or an accurate
thermometer.
• Press RANGE to select temperature mode.
The "°C" symbol will blink to indicate that
the temperature probe is not connected.
• Press the UP and DOWN arrow keys to display and set the
sample temperature (e.g. 25.0°C).
• Press RANGE to select the pH measurement mode and immerse
the pH electrode into the solution. The displayed pH reading will
be temperature compensated (in this case at 25°C).
ORP MEASUREMENTS (HI 8014, HI 8314, HI 8424,
HI 8915 AND HI 9622)
Connect an ORP electrode to the BNC socket on the top of the meter.
To enter the "mV" mode (ORP Oxidation Re-
duction Potential) turn the instrument ON and
select the mV mode (HI 8014, HI 8314 and
HI 8915) or press the RANGE key until the
display changes to mV (HI 8424 and
HI 9622).
°
C
RANGE
ºC
RANGE
pH
RANGE
mV
OFF
mV
°C
pH
35
• Use the UP and DOWN keys to set the temperature manually to
the above value.
• Follow the rest of the calibration procedure as described previously
(see page 32).
ºC
For manual temperature compensation during calibration (HI 8014,
HI 8424 and HI 9622), 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