Hanna Instruments HI520 - Annex; Buffer Values at Various Temperatures

169 Annex
HI605101 Rail Mount Kit
29. ANNEX
29.1. BUFFER VALUES AT VARIOUS TEMPERATURES
Temperature has an effect on pH. The calibration buffer solutions are affected by temperature. During two‑ or three‑
point buffer calibration, the controller utilizes auto buffer recognition. The following chart is for reference only.
Temperature pH Values
°C °F 4.01 6.86 7.01 9.18 10.01
0 32 4.01 6.98 7.13 9.46 10.32
5 41 4.00 6.95 7.10 9.39 10.25
10 50 4.00 6.92 7.07 9.33 10.18
15 59 4.00 6.90 7.05 9.27 10.12
20 68 4.00 6.88 7.03 9.22 10.06
25 77 4.01 6.86 7.01 9.18 10.01
30 86 4.02 6.85 7.00 9.14 9.96
35 95 4.03 6.84 6.99 9.11 9.92
40 104 4.04 6.84 6.98 9.07 9.88
45 113 4.05 6.83 6.98 9.04 9.85
50 122 4.06 6.83 6.98 9.01 9.82
55 131 4.08 6.84 6.98 8.99 9.79
60 140 4.09 6.84 6.98 8.97 9.77
65 149 4.11 6.84 6.99 8.95 9.76
70 158 4.12 6.85 6.99 8.93 9.75
For instance, if the buffer temperature is 25 °C, the display should show 4.01, 7.01, or 10.01 pH for 4, 7, or
10 pH buffers, respectively.
At 20 °C, the display should show 4.00, 7.03, or 10.06 pH.
At 50 °C, the display should show 4.06, 6.98, or 9.82 pH.