horiba LAQUA-PH1500, Instruction Manual

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Technical Note
41
■ Appendix
● Appendix 1
This section describes technical information and option for LAQUA PH1500 benchtop meter.
pH calibration can be performed according to several buffer standards. The most common
standard is the US buffer standard. The default setup is US buffer standard. Alternative
standards that can be chosen are NIST and DIN.
The pH buffers are temperature dependent i.e. the pH value changes with change in
temperature. The meter is intelligent to detect the temperature and pH value associated with
buffer when calibration is performed. It remembers all the temperature vs. pH value for all the
standards.
The pH vs. temperature values for the various standards are listed below:
< USA >
Temp. (°C) pH 1.68 pH 4.01 pH 7.00 pH 10.01 pH 12.46
0 1.67 4.01 7.12 10.32
5 1.67 4.01 7.09 10.25 13.25
10 1.67 4.00 7.06 10.18 13.03
15 1.67 4.00 7.04 10.12
20 1.68 4.00 7.02 10.06 12.64
25 1.68 4.01 7.00 10.01 12.46
30 1.69 4.01 6.98 9.97 12.29
35 1.69 4.02 6.98 9.93
40 1.70 4.03 6.97 9.89 11.99
45 1.70 4.04 6.97 9.86
50 1.71 4.06 6.97 9.83 11.73
55 1.72 4.08 6.97 9.81