Manual FLOW 38 Page 52 (total 54) COMAC CAL s.r.o.
Faults and their symptoms during measurement
Unstable indications and readouts may appear due to:
- big portion of solids
- in homogeneities as a result of the state of matter
- turning point of immixture
- continuous chemical reactions in the measured fluid
- use of diaphragm pumps or plunger pumps
- poor grounding
Flow sensor cleaning
Some measured liquids contain substances and chemicals that tend to form layers inside the pipes
including the measuring pipe, which may affect the measurement accuracy. In this case it is necessary
to clean the flow sensor from time to time. Ceramic pipes can be cleaned mechanically with a steel brush
and then the cleaning can be completed using diluted hydrochloride acid or citric acid solution. The acid
removes calcareous layers or black layers of iron complex. If the contamination is greasy, it must be
cleaned by caustic soda or potassium hydroxide solution. Flow sensors with teflon, plastic and rubber
measuring pipe cannot be cleaned mechanically with a brush, it is only possible to clean them
chemically. After cleaning, the pipe must be properly rinsed with water.
Servicing
All repairs within warranty and after warranty period are only conducted by the manufacturer, COMAC
CAL s. r.o.
When the operations described below are carried out incompetently, the claim for warranty for errors
resulting from this becomes null and void !!!
Turn off the power every time the evaluation unit is opened!!!
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