EN-10 STARTER 2100 Bench pH Meters
4.1.2 Performing 1-point calibration
Calibration:
pH electrodes need to be calibrated with pH standard buffer solutions before a
proper pH measurement can be made.
Calibration
is to display the correct
pH
value when the
meter receives the
mV
value signal from the pH electrode.
Slope
: the linear coefficient between mV and pH according to theoretical value (e.g. -
59.16mV/pH @ 25 °C which means 100% slope);
Offset
: the mV value when pH value is 7.00. (Theoretical value is 0 mV);
Begin by ensuring the meter is plugged in, the electrode is properly attached and the meter is
powered on by pressing
.
Place the pH electrode in the prepared buffer solution, stir for approximately 5 seconds and
wait for an additional 30-60 seconds.
Press button-
, “
Cal 1
” displays on the top right of the screen and is blinking. The
measurement icon appears on the top of the screen, is blinking during calibration.
When the reading is stable (normally the reading does not change in 5s), press button-
to lock the reading and finish 1 point calibration. The buffer value (e.g. pH 7.00)
with the temperature is displayed on the screen; the meter can recognize the buffer
automatically (auto buffer recognition).
The 1-point calibration is finished; now we have 3 options:
Press button-
to store the 1-point calibration data and exit, the
offset
and the
slope
are shown on the display for 3 seconds then returns to the measurement screen.
5 °C
1.67
4.01
7.09
10.25
10 °C
1.67
4.00
7.06
10.18
15 °C
1.67
4.00
7.04
10.12
20 °C
1.68
4.00
7.02
10.06
25 °C
1.68
4.01
7.00
10.01
30 °C
1.68
4.01
6.99
9.97
35 °C
1.69
4.02
6.98
9.93
40 °C
1.69
4.03
6.97
9.89
45 °C
1.70
4.05
6.97
9.86
50 °C
1.71
4.06
6.96
9.83
Содержание STARTER 2100
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