Hach Lange sensION+ EC71 Manual page 19

4. Operation
4.10.3. Resistivity measurementst:
Resistivity measurement with printer, See EC measurement with printer, page 12.
4.10.4. NaCl, TDS and Resistivity calibration
Standard recognition
The instrument recognises the same standard as in the EC cali-
bration, molar standards.
Calibration to X value
Manual readjustment of the selected unit, NaCl or TDS.
Cell constant introduction
Manual introduction of the cell constant. For example, when the
cell has been calibrated previously in calibration laboratory.
sensION+ EC71 HACH LANGE 7010.indd ANG:15 sensION+ EC71 HACH LANGE 7010.indd ANG:15
10-04-2010 17:45 10-04-2010
TDS MEASURE MEASURE
New calibration New calibration
in 15 days in 15 days
By Stability
...
Start measurement
MEASURING
by stability
* * *
.cm
Sample 1
etc.
17:45
Reprogramming resistivity
measurement conditions
Measuring conditions
Measurement
in continuous
Measuring conditions
MEASURING
(continuous)
21,4˚C 21,4˚C
825
.cm
00:01 Sample 1 00:01
etc.
Theoretical calibration
Selecting theoretical calibration the calibration data in memory
will be replaced by C=1.000 cm
This is a previous step of the obtention of calibration certificate.
Calibration frequency
Select between 0 h and 7 days. The instrument by default is
programmed for daily calibration and indicates the remaining
time to the new calibration. Selecting 0 h the automatic re-cali-
bration warning is deactivated.
TC: lineal 2.00%/˚C
Tref: 25˚C
Meas.: stability
Start measurement
TC: lineal 2.00%/˚C
Tref: 25˚C
Meas.: stability etc.
Start measurement
-1 .
15
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