Recognized Buffers And Redox Standard; Measurement - HACH LANGE si629 P Manuel D'utilisateur

4. Operation

4.8. Recognized Buffers and Redox standard

Table of values according to temperature.
Values stored in the si629 P
Available Buffer and Redox standard:
°C
0 2.01
10 2.01
20 2.00
25 2.00
30 2.00
40 2.00
50 2.00
60 2.00
70 2.01
80 2.01
90 2.01

4.9. Measurement

pH and temperature measurement
The pH value and the temperature in °C appear simultaneously on the display. The instrument is usually
measuring pH or mV (see page 18-19).
The temperature is measured when an A.T.C. Pt 1000 or Pt 100 is connected. Otherwise, it is necessary
to inform the instrument about the temperature of the measured solution using the keys
ORP (redox) measurement. mV range
To measure redox potential the instrument must be programmed to measure mV (see page 18-19).
The temperature is measured when an A.T.C. Pt 1000 or Pt 100 is connected.
The redox potential (mV) of the solutions is affected by temperature. Nevertheless the instrument does not
carry out any compensation. Hence it is impossible to introduce the process temperature manually.
pH measurement...
...without A.T.C. Pt 1000
M E A S U R E
pH 7.34 25 °C
Temperature
selected
manually
M E A S U R E
pH 7.34 17 °C
22
si629 P_HACH_LANGE_Ed.0510.indd ANG:22 si629 P_HACH_LANGE_Ed.0510.indd ANG:22
.
pH
4.01 7.12 9.52
4.00 7.06 9.38
4.00 7.02 9.26
4.01 7.00 9.21
4.01 6.99 9.16
4.03 6.97 9.06
4.06 6.97 8.99
4.10 6.98 8.93
4.16 7.00 8.88
4.22 7.04 8.83
4.30 7.09 8.79
...with A.T.C. Pt 1000
M E A S U R E
pH 7.34 25.2 °C
Temperature
measured
automatically
M E A S U R E
pH 7.34 25.1 °C
CODE 000
mV
11.45 --
11.20 245
11.00 228
10.90 220
10.81 212
10.64 195
10.48 178
10.23 160
10.19 142
10.06 --
9.93 --
mV measurement...
...without A.T.C. Pt 1000
M E A S U R E
375 mV
Temperature
not indicated
.
...with A.T.C. Pt 1000
M E A S U R E
375 mV 21.3 °C
Temperature
totally
independent
M E A S U R E
375 mV 21.4 °C
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