Hach-Lange SI627 P - Manual (Page 21)

17
4. Operation
ENGLISH
4.8. Recognized Buffers
Table of values according to temperature.
Values stored in the si627 P
°C pH
0 2.01 4.01 7.12 9.52 11.45
10 2.01 4.00 7.06 9.38 11.20
20 2.00 4.00 7.02 9.26 11.00
25 2.00 4.01 7.00 9.21 10.90
30 2.00 4.01 6.99 9.16 10.81
40 2.00 4.03 6.97 9.06 10.64
50 2.00 4.06 6.97 8.99 10.48
60 2.00 4.10 6.98 8.93 10.23
70 2.01 4.16 7.00 8.88 10.19
80 2.01 4.22 7.04 8.83 10.06
90 2.01 4.30 7.09 8.79 9.93
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 (see page 13).
The temperature is measured when an A.T.C. Pt 1000 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 14).
The temperature is measured when an A.T.C. Pt 1000 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.
M E A S U R E
pH 7.34 25.2 °C
M E A S U R E
375 mV
M E A S U R E
375 mV 21.3 °C
M E A S U R E
pH 7.34 25.1 °C
M E A S U R E
375 mV 21.4 °C
CODE 000
pH measurement... mV measurement...
...without A.T.C. Pt 1000 ...with A.T.C. Pt 1000 ...without A.T.C. Pt 1000 ...with A.T.C. Pt 1000
M E A S U R E
pH 7.34 17 °C
Temperature
selected
manually
Temperature
measured
automatically
Temperature
not indicated
Temperature
totally
independent
M E A S U R E
pH 7.34 25 °C
si627 P_HACH_LANGE_Ed.0510.indd ANG:17 si627 P_HACH_LANGE_Ed.0510.indd ANG:17 20/5/10 10:50:48 20/5/10 10:50:48