YSI IQ S ENSOR N ET NitraVis 70x IQ - Manual (Page 36)

Maintenance and cleaning
NitraVis 70x IQ
5 - 2 ba75950e02 11/2012
5.2.2 General steps to be taken
Depending on the application site and the level of contamination of the
sensor as well as the coming job, the cleaning procedure includes the
following parts:

Every cleaning procedure starts with a basic cleaning. It removes
tough grime such as incrustation of fouling matter, algae and biolog-
ical deposits. If the sensor surface might be contaminated with
pathogenic germs it should also be disinfected.
 Cleaning the measuring gap: Removal of lime deposits.
 Cleaning the measuring gap: Removal of grease deposits.
Example 1 A heavily contaminated sensor from the inlet of a waste water treat-
ment plant, for which a Sensor check or Zero adjustment should be
carried out, must run through all cleaning steps properly. During the
cleaning process always keep all surfaces moist to prevent already
dissolved contamination and detergents from drying ("working wet-on-
wet"). Finally, thoroughly rinse off all remaining cleaning agents with
ultrapure water.
Example 2 If the sensor from example 1 should be cleaned on site during a routine
visual inspection and should then continue measuring, a basic cleaning
might possibly be sufficient.
The quoted examples and the following descriptions are intended to
give a general guideline. Due to the sensor's wide range of application,
the type and level of contamination can considerably vary. Therefore,
the cleaning procedure has to be individually composed. If necessary,
individual cleaning steps have to be changed or repeated several times
until the result meets the requirements.