Hach-Lange NH4D sc Ammonium Sensor - Manual (Page 24)

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Operation
4.6.3 Matrix correction
4.6.3.1 MATX1 correction (one point matrix correction)
Proceed as follows to perform the MATX1:
1. Select SENSOR SETUP>NH4D SC>CALIBRATE> CAL CONFIG .
2. Select MATX1 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 and confirm by pressing
ENTER (Drift should be < 0,03 mg/l). The values for ammonium
and potassium are saved.
5. Immediately after saving, 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. Confirmation of the entered laboratory
value activates the matrix correction.
4.6.3.2 MATX1 K+ correction
Proceed as follows to perform the MATX1 K+:
1. Select SENSOR SETUP>NH4D SC>CALIBRATE> CAL CONFIG .
2. Select MATX1 K+ 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 and confirm by pressing
ENTER (Drift should be < 0,03 mg/l). The values for ammonium
and potassium are saved.
5. Immediately after saving, take a water sample for laboratory
analysis from as close to the sensor as possible.
CALIBRATE
CAL. CONFIG.
DATE
CONC MEAS 1
SET NH4–N CONC
READING STABLE?
NH4–N:
DRIFT
K+
DRIFT
CALIBRATE
CAL. CONFIG.
DATE
CONC MEAS 1
SET K+ CONC
SET NH4–N CONC
READING STABLE?
NH4–N:
DRIFT
K+
DRIFT