Buffer Solutions - Testo 252 Bedienungsanleitung

DIN buffer
° C 1.679 4.006 6.865 9.180 2.00
10 1.670 4.000 6.923 9.332 2.00
15 1.672 3.999 6.900 9.276 2.00
20 1.675 4.001 6.881 9.225 2.00
25 1.679 4.,006 6.865 9.180 2.00
30 1.683 4.012 6.853 9.139 1.98
35 1.688 4.021 6.844 9.102 1.99
38 1.691 4.027 6.840 9.081
40 1.694 4.031 6.838 9.068 2.00
45 1.700 4.043 6.834 9.038
50 1.707 4.057 6.833 9.011 1.99
55 1.715 4.071 6.834 8.985
60 1.723 4.087 6.836 8.962 1.99
An important part of maintenance is checking the
accuracy of the measured value. This is done with
solutions of a known pH value, so-called
buffer solutions. There are a variety of different
buffer solutions whose pH values cover the
complete pH range. One generally distinguishes
between DIN (or NBS buffers) and technical
buffers.
DIN or NBS buffers distinguish themselves through
a very high accuracy (max. 0.005 pH units). The
disadvantage is that the low buffer effect makes
the solution susceptible to dirt and dilution.
Technical buffers shows tolerances of up to ±0.02
pH units, the pH value is, however, much more
stable.
The temperature-controlled pH changes of the
buffer solutions stored in testo 252 are listed in the
following table:
Use the solutions offered in the ordering data, as
their temperature curves are stored in the
measuring instruments.

Buffer solutions

Testo buffer
4.00 7.00 10.00
4.00 7.07 10.18
4.00 7.04 10.14
4.00 7.02 10.06
4.00 7.00 10.00
4.01 6.99 9.95
4.02 6.98 9.91
4.03 6.97 9.85
4.05 6.96 9.78
4.08 6.96 9.75
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