ETA Systems FC01-LQ - Manual (Page 12)

Flow Meter FC01-LQ Flow Meter FC01-LQ
6 Installation 6 Installation
2 Installation
These are general directions for the application of calorimetric measuring heads which from
application to application should be reviewed by the user in accordance with individual
requirements.
2.1 Selection of material
Stainless steel 1.4571 / AISI 316 Ti
The standard monitoring head material is stainless steel 1.4571/AISI 316 Ti, an austenitic, acid-
resisting stainless steel that is commonly used throughout industry. Manufacturers claim it also
withstands oxidizing organic and anorganic acids, and partly even reductive media.
The resistance of this stainless steel should however be verified by the user, particularly when it
is used in medium mixtures that may from time to time be exchanged with cleansing agents. Its
chemical resistance also depends on temperature, flow rate and concentration of the medium.
Stainless steels owe their resistance to rust mainly to their alloy combination with chromium, the
formation of chromic oxide on the steel surface resulting in a passive state. Contamination,
deposits on the surface, or foreign rust may however neutralize the passivity. Therefore care
should be taken to keep the surfaces clean.
Stainless steel heads must not get in contact with steel parts other than stainless steel or with
chemically dissimilar metals, as this would cause electrolytic corrosion.
Nickel-based alloy (Hastelloy 2.4610)
Hastelloy 2.6410 is a material with a chemical resistance generally exceeding that of stainless
steel and copper-based alloys. They are particularly suitable for alkaline media (pH > 7). They
should however be examined for suitability for each specific application using resistance tables
and pragmatical values.
2 Installation
These are general directions for the application of calorimetric measuring heads which from
application to application should be reviewed by the user in accordance with individual
requirements.
2.1 Selection of material
Stainless steel 1.4571 / AISI 316 Ti
The standard monitoring head material is stainless steel 1.4571/AISI 316 Ti, an austenitic, acid-
resisting stainless steel that is commonly used throughout industry. Manufacturers claim it also
withstands oxidizing organic and anorganic acids, and partly even reductive media.
The resistance of this stainless steel should however be verified by the user, particularly when it
is used in medium mixtures that may from time to time be exchanged with cleansing agents. Its
chemical resistance also depends on temperature, flow rate and concentration of the medium.
Stainless steels owe their resistance to rust mainly to their alloy combination with chromium, the
formation of chromic oxide on the steel surface resulting in a passive state. Contamination,
deposits on the surface, or foreign rust may however neutralize the passivity. Therefore care
should be taken to keep the surfaces clean.
Stainless steel heads must not get in contact with steel parts other than stainless steel or with
chemically dissimilar metals, as this would cause electrolytic corrosion.
Nickel-based alloy (Hastelloy 2.4610)
Hastelloy 2.6410 is a material with a chemical resistance generally exceeding that of stainless
steel and copper-based alloys. They are particularly suitable for alkaline media (pH > 7). They
should however be examined for suitability for each specific application using resistance tables
and pragmatical values.