5 value correction, Ue correction (see, Operation – Hach-Lange NH4D sc Ammonium Sensor User Manual
Page 28
28
Operation
4.6.3.5 Value correction
Value correction offers the option of subsequently correcting a
matrix at two different concentrations.
Take several samples on various days with different concentrations
and perform an analysis of the samples in the laboratory.
Note: The concentrations should be in a concentration range of at least
half a decade.
1.
Note the two displayed ammonium and potassium values,
which are measured with the sensor at the time of the
sampling.
2.
Then note the measured ammonium laboratory reference
value.
All 3 values form a correction point.
3.
From the values recorded, select the two correction points with
ammonium concentrations as far apart as possible.
4.
Select
CAL CONFIG.> CALIBRATE>VALUE CORR
from the menu
and press
ENTER
to confirm.
Enter the 3 noted values:
5.
1. NH4–N NH4D sc: Enter the displayed NH
4
–N value for the
1st correction point. Press
ENTER
to confirm.
6.
1. K+ NH4D sc: Enter the displayed K+ value for the 1st
correction point. Press
ENTER
to confirm.
7.
1. NH4–N lab: Enter the measured NH
4
–N laboratory
reference value for the 1st correction point. Press
ENTER
to
confirm.
8.
2. NH4–N NH4D sc: Enter the displayed NH
4
–N value for the
2nd correction point. Press
ENTER
to confirm.
9.
2. K+ NH4D sc: Enter the displayed K+ value for the 2nd
correction point. Press
ENTER
to confirm.
10. 2. NH4–N lab: Enter the measured NH
4
–N laboratory
reference value for the 2nd correction point. Press
ENTER
to
confirm.
Value correction is activated and displayed as
MATX2
.