Hach-Lange NH4D sc Ammonium Sensor - Manual (Page 25)

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Operation
6. Analyze the sample immediately after taking the sample as its
ammonium content can change quickly.
After determining the laboratory reference values for potassium and
ammonium, proceed as follows:
7. Select SENSOR SETUP>NH4D SC>CALIBRATE>
SET NH4–N CONC .
8. Enter the laboratory reference value for NH4–N and press
ENTER to confirm.
9. Select SENSOR SETUP>NH4D SC>CALIBRATE>
SET K+ CONC .
10. Enter the laboratory reference value for potassium and press
ENTER to confirm.
Confirmation of the entered laboratory value activates the
matrix correction.
4.6.3.3 MATX2 correction (2nd point matrix correction)
Proceed as follows to perform the MATX2:
1. Select SENSOR SETUP>NH4D SC>CALIBRATE>CAL CONFIG .
2. Select MATX2 in the selection window and press ENTER .
3. Select CONC MEAS 1 .
The currently measured ammonium and potassium values are
displayed. The drift indicates whether the measured value is stable.
4. Wait until the measured value is stable (Drift should be
< 0,03 mg/l) and press
ENTER to confirm. The value for
ammonium is saved.
5. Immediately after measuring, take a water sample for
laboratory analysis from as close to the sensor as possible.
6. Analyze the sample immediately after taking the sample as its
ammonium content can change quickly.
After determining the laboratory reference value, proceed as
follows:
7. Select SENSOR SETUP>NH4D SC>CALIBRATE>
SET NH4–N CONC .
8. Enter the laboratory value (reference value) for NH
4
–N and
press ENTER to confirm.
9. Select MEAS CONC 2 and repeat the sequence from Point 4 to
8 for the second value after a concentration change of at least
half a decade.
CALIBRATE
CAL. CONFIG.
CONC MEAS 1
DATE
SET NH4–N CONC
CONC MEAS 2
DATE
SET NH4–N CONC
READING STABLE?
NH4–N:
DRIFT
K+
DRIFT