10
Calibration with Nist Standard (if you have NIST buffer solution)
7.21 Make sure the unit is properly installed and electrode connected.
7.22 This meter can automatically recognize the Nist Standard buffer
solution. You will need at least 2 buffer solutions. Always begin
with “Offset” calibration first.
7.23 Rinse the pH electrodes and temperature probe in distilled water
then dip in the buffer solution, first on the Offset buffer (pH6.86)
then subsequently on each slope buffer.
7.24 Press CAL key and display will show the 6.86 and CAL blinking,
indicating it is in calibration mode.
7.25 Value will vary according to temperature listed below table:
NIST standard buffer solution Temperature
(°C)
Slope
1.68
Slope
4.01
Offset
6.86
Slope
9.18
Slope
12.45
0 1.67 4.01 6.98 9.47 13.43
5 1.67 4.00 6.95 9.38 13.21
10 1.67 4.00 6.92 9.32 13.00
15 1.67 4.00 6.90 9.27 12.81
20 1.68 4.00 6.88 9.22 12.63
25 1.68 4.01 6.86 9.18 12.45
30 1.69 4.01 6.85 9.14 12.29
35 1.69 4.02 6.84 9.10 12.13
40 1.70 4.03 6.84 9.07 11.99
45 1.70 4.04 6.83 9.04 11.84
50 1.71 4.06 6.83 9.01 11.70
55 1.72 4.06 6.83 8.99 11.57
60 1.72 4.08 6.84 8.96 11.45
65 1.73 4.10 6.84 8.94
70 1.74 4.12 6.85 8.92
75 1.75 4.14 6.85 8.90
80 1.77 4.16 6.86 8.88
85 1.78 4.18 6.87 8.87
90 1.80 4.21 6.88 8.85
95 1.81 4.24 6.89 8.83
Always rinses the electrode with distilled water before and after each
test. This is to prevent solution carry over or cross contamination.
Standard solutions must maintain highest purity; otherwise the
meter’s accuracy could be compromised.
To Next Page
Loading...
