4 matx2 k+ correction, Tx2 k, Operation – Hach-Lange NH4D sc Ammonium Sensor User Manual
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Operation
10. By confirming the second laboratory value, the Matrix2
correction is activated.
4.6.3.4 MATX2 K+ correction
Select
MATX2 K+
to calibrate the ammonium and potassium sensor
simultaneously at two different measuring points.
The calibration is carried out via a standard addition in the sample
matrix. Proceed as follows to perform the MATX2 K+:
1.
Fill a 10-liter bucket with 3 to 5 liters of sample from the sample
flow in which the sensor is immersed.
2.
Then place the probe in the bucket containing the sample.
3.
Select
SENSOR SETUP>NH4D SC>CALIBRATE> CAL CONFIG
.
4.
Select
MATX2 K+
in the selection window and press
ENTER
.
5.
Select
CONC MEAS 1
and wait until the NH
4
–N and K values
are stable (drift should be <0,03 mg/l).
Additional steps for various sample concentrations:
Sample concentration 1:
" 10 mg/l NH
4
–N
and
60 mg/l K
6.
Press
ENTER
.
7.
Perform the ammonium cuvette/vial test (LCK 305 and
LCK 303) and the LCK 228 potassium cuvette test
simultaneously from the filtered or sedimented sample.
8.
During the reaction phase of both cuvette/vial tests, pipette
8 ml from the LCW892 mix standard to the sample in the
bucket.
9.
With the probe, mix the sample in the bucket and wait
3 minutes.
10. Select
CONC MEAS 2
and wait until the NH
4
–N and K values
are stable (drift should be <0,03 mg/l).
11. Press
ENTER
.
12. Dilute the sample for the cuvette/vial tests 1:3.
13. Perform the LCK 303 ammonium cuvette/vial test and the
LCK 228 potassium cuvette test simultaneously from the
filtered or sedimented sample.
14. When having the results of all cuvette/vial tests, enter the
ammonium and potassium concentrations for both measuring
points under
SET K+
and
SET NH4–N
.
15. The message
CAL. COMPLETED OK
. appears if the calibration
was successful.
Sample concentration 2: 10 100 mg/l NH
4
–N and 60 mg/l K
6.
Press
ENTER
.
7.
Perform the LCK 303 ammonium cuvette/vial test and the
LCK 228 potassium cuvette test simultaneously from the
filtered or sedimented sample (if necessary, dilute the sample
accordingly).
CALIBRATE
CAL. CONFIG.
CONC MEAS 1
DATE
SET K+ CONC
SET NH4–N CONC
CONC MEAS 2
DATE
SET K+ CONC
SET NH4–N CONC