Hach-Lange NISE sc - Manual (Page 31)

N O T I C E
Maintenance task 30 days 1 12 months
N O T I C E
31
Section 5 Maintenance
Note: Do not test the sensor with the usual NH4-N and/or NO3-N standard solutions, as the ion
strength of normal solutions is not high enough.
5.2 Clean the sensor
1. Clean the sensor cartridge using the soft brush supplied.
2. Clean the probe body (not the sensor cartridge) with a sponge or brush.
3. Rinse the sensor with clean, lukewarm water.
5.2.1 Polish the chloride electrode (AN-ISE sc and NISE sc only)
Polish the chloride electrode if it looks heavily coated/contaminated.
After polishing, a new nitrate + chloride MATRIX1 correction should be performed after 12
hours.
N O T I C E
Only qualified personnel should conduct the tasks described in this section of the operating
manual.
5.1 Maintenance schedule
Clean the probe 2 x
Replace the sensor cartridge 3, 4 x
Check probe for damage x
Compare the measured value with a reference laboratory analysis and correct
the values as required via a matrix correction
3
x
1 Recommended: Weekly during the first month of operation
2 The frequency of cleaning depends on the application. Some applications may require cleaning to take place more or less
frequently.
3 In typical operating conditions, a different interval may be required depending on the specific application and local conditions.
4 Sensor cartridges are wearing parts and are not covered by the instrument warranty.
Do not touch the membranes with fingers. To avoid scratches, do not clean the sensor cartridge
using sharp objects and do not use chemical cleaning agents.
Only use the LZY671 polishing paper supplied.