Measurement in the mv non-autolock mode, Ph calibration buffer table, Temperature coefficient of the ph buffers – Electro-Chemical Devices (ECD) L20 User Manual
Page 14
[Note: For samples that are inherently unstable, the unit will not
AUTOLOCK. In this case, use the pH NON- AUTOLOCK mode for
measurements.]
Measurement in the mV NON-AUTOLOCK mode
1.
Connect the optional combination ORP electrode to the
BNC connector of the unit.
2.
Press “Mode” key until “mV” icon light up.
3.
Rinse electrode with distilled water and immerse it in
sample to be measured.
4.
Allow sufficient time for the display to stabilize. The
instrument will display the mV value of the sample.
pH Calibration Buffer Table
The temperature coefficient of pH calibration buffers 4.01, 6.86,
7.00, 9.18 and 10.01 are stored inside the instrument. The buffers
used to calibrate the instrument must exhibit the same temperature
characteristics as the stored values.
Temperature coefficient of the pH buffers
°C
4.00
6.86
9.18
4.01
7.00
10.01
0
4.01
6.98
9.46
4.01
7.11
10.32
5
4.00
6.95
9.39
4.01
7.08
10.25
10
4.00
6.92
9.33
4.00
7.06
10.18
15
4.00
6.90
9.28
4.00
7.03
10.12
20
4.00
6.88
9.23
4.00
7.01
10.06
25
4.00
6.86
9.18
4.01
7.00
10.01
30
4.01
6.85
9.14
4.01
6.98
9.97
35
4.02
6.84
9.10
4.02
6.98
9.93
40
4.03
6.84
9.07
4.03
6.97
9.89
45
4.04
6.83
9.04
4.04
6.97
9.86
50
4.06
6.83
9.02
4.06
6.97
9.83
55
4.07
6.83
8.99
4.08
6.97
9.80
60
4.09
6.84
8.97
4.10
6.98
9.78
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