35
34
•
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.
pppppH VALUES AT VARIOUS
H VALUES AT VARIOUS
H VALUES AT VARIOUS
H VALUES AT VARIOUS
H VALUES AT VARIOUS
TEMPERATURES
TEMPERATURES
TEMPERATURES
TEMPERATURES
TEMPERATURES
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
For instance, if the buffer temperature is 25°C, the display should
show pH 4.01 or 7.01 or 10.01.
If the buffer temperature is 20°C, the display should show pH 4.00
or 7.03 or 10.06.
If the buffer temperature is 50°C, the display should show pH 4.06
or 6.98 or 9.82.
pH
CAL
• The meter will request pH 4.01 or 10.01
buffer showing "Er-4". This indicates that
the instrument is ready for the second
point calibration
Note:
only when the CFM is pressed for the offset calibration will the
meter permanently memorize the new calibration date (until
next calibration).
•
Rinse the electrode and temperature probe before immersing
them into a pH 4.01 / pH 10.01 calibration buffer, stir gently
and wait a couple of minutes for thermal equilibrium. The display
will now show the value of the temperature compensated buffer
solution.
• When "CAL" disappears and the meter displays "CFM" press CFM
to confirm the slope calibration.
The instrument is now calibrated and will remain calibrated even
when it is turned off.
Note:
the meter will lose calibration if the battery is removed.
If for some reason the temperature probe is out of order, or a
manual
temperature compensation
is required, follow the procedure below:
•
Make sure the temperature probe is detached.
• Press RANGE to select the temperature
mode.
• Place the tip of the pH electrode into the
pH 7.01 buffer and stir gently. Wait a
couple of minutes for thermal equilibrium.
• Note the temperature of the buffer with a
ChecktempC (or an accurate thermometer),
e.g. 20°C.
HI 7004
pH
CAL
pH
CFM
CFM
RANGE
°C
