Yokogawa 2-Wire Dual Channel Transmitter/Analyzer FLXA21 Manual de usuario descargar pdf (Pagina 213)

App.1-1

IM 12A01A02-01E 5th Edition : Oct. 31, 2013-00

Appendix 1 For pH/ORP

n Buffer tables

The following tables show the details of the buffer solutions selectable in Calibration settings of

pH (Section 4.2.4) (unit: pH).

Table 1 NIST (IEC 60746-2)/DIN 19266

0°C 5°C 10°C 15°C 20°C 25°C 30°C 35°C 38°C 40°C 45°C 50°C 55°C 60°C 70°C 80°C 90°C 95°C

1.68 pH

1.668 1.670 1.672 1.675 1.679 1.683 1.688 1.691 1.694 1.700 1.707 1.715 1.723 1.743 1.766 1.792 1.806

4.01 pH

4.003 3.999 3.998 3.999 4.002 4.008 4.015 4.024 4.030 4.035 4.047 4.060 4.075 4.091 4.126 4.164 4.205 4.227

6.87 pH

6.984 6.951 6.923 6.900 6.881 6.865 6.853 6.844 6.840 6.838 6.834 6.833 6.834 6.836 6.845 6.859 6.877 6.886

9.18 pH

9.464 9.395 9.332 9.276 9.225 9.180 9.139 9.102 9.081 9.068 9.038 9.011 8.985 8.962 8.921 8.885 8.850 8.833

Table 2 DIN 19267 (German buffers) so called: technical buffer solutions

0°C 10°C 20°C 25°C 30°C 40°C 50°C 60°C 70°C 80°C 90°C

4.65 pH DIN

4.670 4.660 4.650 4.650 4.650 4.660 4.680 4.700 4.720 4.750 4.790

6.79 pH DIN

6.890 6.840 6.800 6.790 6.780 6.760 6.760 6.760 6.760 6.780 6.800

9.23 pH DIN

9.480 9.370 9.270 9.230 9.180 9.090 9.000 8.920 8.880 8.850 8.820

Table 3 US technical buffers

0°C 5°C 10°C 15°C 20°C 25°C 30°C 35°C 40°C 45°C 50°C 55°C 60°C

4.0 pH US

4.000 3.998 3.997 3.998 4.001 4.005 4.001 4.018 4.027 4.038 4.050 4.064 4.080

7.0 pH US

7.120 7.090 7.060 7.040 7.020 7.000 6.990 6.980 6.988 6.978 6.970 6.890 6.980

10.0 pH US

10.317 10.245 10.179 10.118 10.062 10.012 9.966 9.926 9.889 9.856 9.828 9.828 9.828

Table 4 FREE PROGRAMMABLE (Default settings based on rounded NIST values).

0°C 5°C 10°C 15°C 20°C 25°C 30°C 35°C 40°C 45°C 50°C 55°C 60°C 65°C 70°C 75°C 80°C

buffer 4

4.00 4.00 4.00 4.00 4.00 4.01 4.02 4.02 4.04 4.05 4.06 4.08 4.09 4.11 4.13 4.15 4.16

buffer 7

6.98 6.95 6.92 6.90 6.88 6.87 6.85 6.84 6.84 6.83 6.83 6.83 6.84 6.84 6.85 6.85 6.86

buffer 9

9.46 9.40 9.33 9.28 9.23 9.18 9.14 9.10 9.07 9.04 9.01 8.99 8.96 8.94 8.92 8.90 8.89

The freely programmable table is populated with a basic set of data to provide a start for the

userconguration.Thistableisintendedfortheusertobeabletochoosehisbuffersolutionsto

suit his own preference. The data concerning the pH temperature characteristic will need to be

obtained from the supplier of the buffers.

NOTE

YokogawarecommendtheuseofNIST(primarybufferstandards)ratherthanbufferswhichhave

been adjusted by the addition of acid or alkaline materials to the buffer composition. In this way

the customer gets a recognized standard, as well as the best buffer capacity (the ability to resist

pH change with contamination).

App.

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