Hanna Instruments HI 9026V - Manual (Page 8)

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pH BUFFER TEMPERATURE DEPENDENCE
pH readings are strongly affected by temperature. The calibration buffer
solutions are affected by temperature changes to a lesser degree than normal
solutions.
For manual temperature calibration please refer to the following chart.
TEMP pH BUFFER VALUES
°C °F 1.68 3.00 4.01 6.86 7.01 9.18 10.01 12.45
0 32 1.67 3.07 4.00 6.98 7.13 9.46 10.32 13.38
5 41 1.67 3.05 4.00 6.95 7.10 9.39 10.25 13.18
10 50 1.67 3.03 4.00 6.92 7.07 9.33 10.18 12.99
15 59 1.67 3.02 4.00 6.90 7.05 9.27 10.12 12.80
20 68 1.67 3.00 4.00 6.88 7.03 9.22 10.06 12.62
25 77 1.68 3.00 4.01 6.86 7.01 9.18 10.01 12.45
30 86 1.68 3.00 4.02 6.85 7.00 9.14 9.96 12.29
35 95 1.69 3.00 4.03 6.84 6.99 9.11 9.92 12.13
40 104 1.69 2.99 4.04 6.84 6.98 9.07 9.88 11.98
45 113 1.70 2.99 4.05 6.83 6.98 9.04 9.85 11.83
50 122 1.71 2.99 4.06 6.83 6.98 9.01 9.82 11.70
55 131 1.72 2.99 4.08 6.84 6.98 8.99 9.79 11.57
60 140 1.72 2.99 4.09 6.84 6.98 8.97 9.77 11.44
65 149 1.73 2.99 4.11 6.84 6.99 8.95 9.75 11.32
70 158 1.74 3.00 4.12 6.85 6.99 8.93 9.75 11.21
75 167 1.76 3.00 4.14 6.86 7.00 8.91 9.74 11.10
80 176 1.77 3.00 4.16 6.87 7.01 8.89 9.74 11.00
85 185 1.78 3.00 4.17 6.87 7.02 8.87 9.74 10.91
90 195 1.79 3.00 4.18 6.88 7.03 8.85 9.75 10.82
95 203 1.81 3.00 4.20 6.88 7.04 8.83 9.76 10.73
LCD MESSAGE GUIDE
TAGS & SYMBOLS
• Mode tags light up for indicating the corresponding active mode, and blink
for warning the user.
SETUP on: setup menu mode has been entered.
CFM blinking: ask confirmation of calibration value.
CAL on: calibration mode has been entered.
CAL blinking: meter is not calibrated or calibration is expired.
RCL, MEM on: when recalling stored values.
MEM blinking: measurement stored in the internal memory and frozen on
the display.
• Indication of temperature compensation mode:
MTC for manual, ATC for automatic compensation.
• Battery symbol blinking: low battery condition, about 25 hours of
working time left. Batteries should be replaced.
• Calibration messages.
NOT READY blinking: buffer had been recognized, but reading is not
stable.
READY on: buffer has been recognized and reading is stable.
WRONG “BUF” & WRONG “Electrode” blinking alternatively: wrong
buffer, value not recognized.
CLEAN blinking: an abnormal difference between new and previous
calibration has been detected. Electrode cleaning is suggested. Follow the
cleaning procedure described in the “Electrode conditioning & mainte-
nance” section.