Hach-Lange NH4D sc Ammonium Sensor - Manual (Page 27)

27
Operation
8. During the reaction phase of both cuvette/vial tests, add 40 ml
from the LCW892 mix standard to the sample in the bucket.
9. With the probe, mix the sample in the bucket once 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 ammonium cuvette/vial test 1:5 and
for the potassium test 1:10.
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+ CONC and SET NH4–N CONC .
15. The message CAL. COMPLETED OK . appears if the calibration
was successful.
Sample concentration 3:
@ 60 mg/l K
(very high potassium concentrations in the waste water)
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 (dilute the sample accordingly).
8. During the reaction phase of both cuvette/vial tests, add 80 ml
from the LCW 892 mix standard to the sample in the bucket.
9. With the probe, mix the sample in the bucket once 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 ammonium cuvette/vial test 1:10 and
for the potassium test 1:25.
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+ CONC and SET NH4–N CONC .
15. The message CAL COMPLETED OK . appears if the calibration
was successful.
Note: In case of a measuring range exceedance an appropriate dilution of
the sample is required.