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pH VALUES AT VARIOUS TEMPERATURES
Temperature has an effect on pH. The calibration buffer solutions are
affected by temperature changes to a lesser degree than normal solutions.
For pH calibration, please refer to the following chart.
For instance, if the buffer temperature is 25°C, the display should show pH
4.01, 7.01 or 10.01 at pH 4, 7 or 10 buffers, respectively.
At 20°C, the display should show pH 4.00, 7.03 or 10.06.
The meter reading at 50°C will then be pH 4.06, 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
ELECTRODE MAINTENANCE
PREPARATION
Remove the protective cap.
DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT. This is normal
with electrodes and they will disappear when rinsed with water.
During transport tiny bubbles of air may form inside the glass bulb affecting
proper functioning of the electrode. These bubbles can be removed by
"shaking down" the electrode as you would do with a glass thermometer.
If the bulb and/or junction is dry, soak the electrode in HI 70300 storage
solution for at least one hour.
MEASUREMENT
Rinse the electrode tip with distilled water. Immerse the tip (at least 4 cm)
in the sample and stir gently for a few seconds.
For a faster response and to avoid cross contamination of the samples, rinse
the electrode tip with a few drops of the solution to be tested, before taking
measurements.
STORAGE
To minimize clogging and assure a quick response time, the glass bulb and
the junction should be kept moist and not allowed to dry out.
Replace the solution in the protective cap with a few drops of HI 70300
storage solution. Follow the Preparation Procedure above before taking
measurements.
Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable used for connection to the
meter must be intact and there must be no points of broken insulation on
the cable or cracks on the electrode stem or bulb. Connectors must be
perfectly clean and dry. If any scratches or cracks are present, replace the
electrode. Rinse off any salt deposits with water.
CLEANING PROCEDURE
General Soak in HI 7061 general cleaning solution for approx. 30
minutes.
Removal of films, dirt or deposits on the membrane/junction:
- Protein Soak in HI 7073 protein cleaning solution for 15 minutes.
- Inorganic Soak in HI 7074 inorganic cleaning solution for 15 minutes.
- Oil/grease Rinse with HI 7077 oil & fat cleaning solution.