Hach-Lange NISE sc - Manual (Page 26)

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Operation
When using the NISE sc probe, only the nitrate membrane and the integrated chloride
electrode are active.
Cross sensitivities between ammonium and potassium/nitrate are automatically
eliminated. Solids do not interfere with the measurement. Due to matrix effects, correction
and validation cannot be performed with standard solutions. A matrix correction can be
carried out quickly and easily at any time.
N O T I C E
4.6.1 Sensor code calibration
The sensor code is a calibration code and is delivered with the sensor cartridge certificate.
It contains the factory calibration described in
section 4.6, page 25 for the sensor
cartridge.
Instruments with automatic sensor code recognition (LXG440.99.x000x) read this
automatically and assume the Cartrical calibration.
Instruments without automatic sensor code recognition (LXG440.99.x001x) require the
sensor code to be entered during the initial setup and whenever a new sensor cartridge is
activated. If the sensor code certificate has been lost, carry out factory calibration (under
the sensor code menu) as a temporary solution.
After activating the code, the sensor is fully calibrated but not yet adapted to the specific
matrix of the relevant application on a waste water treatment plant. At least 12 hours must
elapse before a matrix correction is performed to allow the cartridge to adapt to the
specific matrix.
Proceed as follows to change the sensor code:
1. Select SENSOR MENU > AN-ISE SC or AISE SC or NISE SC > CALIBRATE > FURTHER
CORR. > SENSOR CODE > ENTER
2. Enter the sensor code.
3. Press ENTER to confirm and activate the sensor code. The day meter for the cartridge
is set to zero.
All old calibration data are now overwritten with the new calibration data from the sensor
code. The sensor code data is checked by the system. If an error is indicated, check the
sensor code and, if necessary, enter the sensor code again.
4.6.2 Matrix correction via LINK2SC
The LINK2SC procedure offers a secure method of data exchange between process
probes and LINK2SC-compatible photometers using an SD memory card or via a local
area network (LAN). Two different options are available:
a. The pure laboratory control measurement
b. A matrix correction that involves the measurement data generated in the
laboratory being used to correct the probe
During a pure control measurement, the measurement data is transferred from the probe
to the photometer where it is then archived together with the photometric reference data
that has been recorded.
During a matrix correction, the reference data generated in the laboratory is transferred to
the probe to be used for the correction.
A matrix correction may only be performed if the sensor has been immersed in the corresponding
waste water matrix for over 12 hours. This is the minimum time required to adapt the ISE
membranes to the waste water matrix.