Hach-Lange NO3D sc Nitrate Sensor - Manual (Page 26)

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Operation
After determining the laboratory reference value, proceed as
follows:
7. Select SENSOR SETUP>NO3D SC>CALIBRATE>
SET NO3–N CONC .
8. Enter the laboratory value (reference value) for NO
3
–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.
10. By confirming the second laboratory value, the Matrix2
correction is activated.
4.6.3.4 MATX2 CL- correction
Select MATX2 CL- to calibrate the nitrate and chloride sensor
simultaneously at two different measuring points.
1. Select SENSOR SETUP>NO3D SC>CALIBRATE> CAL CONFIG .
2. Select MATX2 CL- in the selection window and press ENTER .
3. Select CONC MEAS 1 and wait until the NO
3
–N and Cl - values
are stable (drift should be <0.03 mg/L).
4. Press ENTER to confirm. The value for nitrate and chloride are
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
nitrate content can change quickly.
After determining the laboratory reference value, proceed as
follows:
1. Select SENSOR SETUP>NO3D SC>CALIBRATE>SET NO3-N
CONC .
2. Enter the laboratory value (reference value) for NO
3
-N and Cl -
press ENTER to confirm.
3. Select MEAS CONC 2 and repeat the sequence from MEAS
CONC 1 for the second value after a concentration change of at
least half a decade.
4. By confirming the second laboratory value, the Matrix2
correction is activated.
CALIBRATE
CAL. CONFIG.
CONC MEAS 1
DATE
SET CL- CONC
SET NO3–N CONC
CONC MEAS 2
DATE
SET CL- CONC
SET NO3–N CONC