Hanna Instruments hi 931700 Benutzerhandbuch
15
14
HI 932700:
Immerse the electrode and the
Potential Matching Pin in HI 7020
ORP solution.
Potential Matching Pin in HI 7020
ORP solution.
Note: When it is not possible to
immerse the Potential Matching Pin together
with the electrode in the solution, disable
the differential input by connecting the con-
nection for Potential Matching Pin with the
connection for Electrode Reference with a
jumper wire.
immerse the Potential Matching Pin together
with the electrode in the solution, disable
the differential input by connecting the con-
nection for Potential Matching Pin with the
connection for Electrode Reference with a
jumper wire.
Adjust the slope trimmer until an ORP value
from 200 mV and 275 mV is displayed.
from 200 mV and 275 mV is displayed.
The calibration is now complete and the instru-
ment is ready for use.
ment is ready for use.
SET
MEA
SET
ON
OFFSET
SLOPE
SET
mV
Note: For better accuracy, calibrate the meter
using a calibration solution at the same
temperature of the liquid to be mea-
sured.
temperature of the liquid to be mea-
sured.
If calibration is performed at a different
temperature, the error is approx.
0.0035pH for each 1°C difference mul-
tiplied by the difference between the pH
of the measured liquid and pH7;
e.g. meter calibrated at 25°C/measured
liquid: pH 4 / liquid temperature: 35°C;
the error is approx.:
0.0035x(35-25)x(7-4) = 0.10 pH.
The error is added or subtracted to the
reading according to table 2.
temperature, the error is approx.
0.0035pH for each 1°C difference mul-
tiplied by the difference between the pH
of the measured liquid and pH7;
e.g. meter calibrated at 25°C/measured
liquid: pH 4 / liquid temperature: 35°C;
the error is approx.:
0.0035x(35-25)x(7-4) = 0.10 pH.
The error is added or subtracted to the
reading according to table 2.
Temp.above 25°C Temp. below 25°C
pH above 7
Subtract
Add
pH below 7
Add
Subtract
Table 2
0
32
4.01
6.98
7.13
9.46
10.32
5
41
4.00
6.95
7.10
9.39
10.24
10
50
4.00
6.92
7.07
9.33
10.18
15
59
4.00
6.90
7.04
9.27
10.12
20
68
4.00
6.88
7.03
9.22
10.06
25
77
4.01
6.86
7.01
9.18
10.01
30
86
4.02
6.85
7.00
9.14
9.96
35
95
4.03
6.84
6.99
9.10
9.92
40
104
4.04
6.84
6.98
9.07
9.88
45
113
4.05
6.83
6.98
9.04
9.85
50
122
4.06
6.83
6.98
9.01
9.82
55
131
4.07
6.84
6.98
8.99
9.79
60
140
4.09
6.84
6.98
8.97
9.77
65
149
4.11
6.85
6.99
8.95
9.76
70
158
4.12
6.85
6.99
8.93
9.75
75
167
4.14
6.86
7.00
8.91
9.74
80
176
4.16
6.86
7.01
8.89
9.73
85
185
4.17
6.87
7.02
8.87
9.74
90
194
4.19
6.88
7.03
8.85
9.75
95
203
4.20
6.89
7.04
8.83
9.76
°F
Buffer
pH 4.01
Buffer
pH 7.01
Buffer
pH 9.18
Buffer
pH 10.01
Temperature
°C
Buffer
pH 6.86
Table 1