Metrohm 780 User Manual

9.4 Stored buffer series
150
780/781 pH/Ion Meter, Manual
9.4 Stored buffer series
For automatic buffer recognition during pH calibration the temperature-
dependent pH values of several common pH buffers are stored in the
780/781 pH/Ion Meter. Apart from the Metrohm buffer solutions other
reference and technical buffers are also included in the tables.
The following tables provide an overview of the stored pH(T) series.
Buffers marked with an * are not taken into account during automatic
buffer recognition if one of the complete sets of buffers is selected as
the buffer type. However, all the buffers listed can be selected to give a
new combination under
PARAMETER pH/calibration parameters/buffer type:
mixed
(see Section 6.2.2).
The pH values printed in bold are the values at the reference tempera-
ture of the particular buffer set.
The pH values marked with
1)
are interpolated or extrapolated values, all
the others correspond to the manufacturer's specifications.
Metrohm NIST (according to DIN standard 19266, 2000)
Temp.
(°C)
Met4 Met7 Met9 NIST1 NIST4 NIST7 NIST9 NIST13
pH 4.00 pH 7.00 pH 9.00 pH 1 pH 4 pH 7 pH 9 pH 13
0 3.99 7.11 9.27 - 4.010 6.984 9.464 13.423
5 3.99 7.08 9.18 1.668 4.004 6.950 9.392 13.207
10 3.99 7.06 9.13 1.670 4.001 6.922 9.331 13.003
15 3.99 7.04 9.08 1.672 4.001 6.900 9.277 12.810
20 3.99 7.02 9.04 1.676 4.003 6.880 9.228 12.627
25 4.00 7.00 9.00 1.680 4.008 6.865 9.184 12.454
30 4.00 6.99 8.96 1.685 4.015 6.853 9.144 12.289
35 4.01 6.98 8.93 1.691 4.025 6.843 9.107 12.133
40 4.02 6.98 8.90 1.697 4.036 6.837 9.076 11.984
45 4.03 6.97 8.87 1.704 4.049 6.834 9.046 11.841
50 4.04 6.97 8.84 1.712 4.064 6.833 9.018 11.705
55 4.06 6.97 8.81 1.715 4.075 6.834 8.985 11.574
60 4.07 6.97 8.79 1.723 4.091 6.836 8.962 11.449
65 4.09 6.98 8.76 1.732
1)
4.108
1)
6.840
1)
8.941
1)
-
70 4.11 6.98 8.74 1.743 4.126 6.845 8.921 -
75 4.13 6.99 8.73 1.754
1)
4.145
1)
6.852
1)
8.902
1)
-
80 4.15 7.00 8.71 1.766 4.164 6.859 8.885 -
85 4.18 7.00 8.70 1.778
1)
4.185
1)
6.867
1)
8.867
1)
-
90 4.20 7.01 8.68 1.792 4.205 6.877 8.850 -
95 4.23 7.02 8.67 1.806 4.227 6.886 8.833 -

Metrohm 780 Specifications

General

Brand	Metrohm
Model	780
Category	Measuring Instruments
Language	English