Technical data

Flow meter FC01-Ex Flow meter FC01-Ex
Ex atmosphere - Definitions and mounting instructions 3 Ex atmosphere - Definitions and mounting instructions 3
2.3 Materials used for calorimetric monitoring heads
The following information contains general recommendations which must be rechecked by the
user for the individual application.
2.3.1 Stainless steel 1.4571/AISI 316 Ti
The standard monitoring head material is stainless steel 1.4571, 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 steel 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.
2.3.2 Nickel-based alloy Hastelloy C4 2.4610
Hastelloy 2.4610 is a material with a chemical resistance generally exceeding that of stainless
steel. It is particularly suitable for alkaline media (pH > 7). It should however be examined for
suitability for each specific application using resistance tables and pragmatical values.
2.3.3 Titanium G7, 3.7235
Titanium is characterised by non-magnetizability and excellent corrosion resistance, particularly
against oxidising media. The resistance is due to the fact that the surface of titanium immediately
builds up an oxidation layer in presence of oxidation means protecting the material beneath against
corrosion.
The technological characteristics of low-alloy titanium G7 are equal to those of plain titanium of
the same strength category. Adding approximately 0.2 % palladium does not influence the
mechanical properties, but also adds considerably to the corrosion resistance of plain titanium.
So titanium G7 has proved to be extremely suitable for use in hydrochlorid or sulphuric acid
solutions with little concentration as well as – with due care – in oxalic acid.
A wide range of applications is possible in aggressive media an zones endangered by sea water.
Please note that physical contact between titanium and magnesium, aluminium, copper or their
alloys might lead to increased electrolytic corrosion of these materials.
2.3 Materials used for calorimetric monitoring heads
The following information contains general recommendations which must be rechecked by the
user for the individual application.
2.3.1 Stainless steel 1.4571/AISI 316 Ti
The standard monitoring head material is stainless steel 1.4571, 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 steel 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.
2.3.2 Nickel-based alloy Hastelloy C4 2.4610
Hastelloy 2.4610 is a material with a chemical resistance generally exceeding that of stainless
steel. It is particularly suitable for alkaline media (pH > 7). It should however be examined for
suitability for each specific application using resistance tables and pragmatical values.
2.3.3 Titanium G7, 3.7235
Titanium is characterised by non-magnetizability and excellent corrosion resistance, particularly
against oxidising media. The resistance is due to the fact that the surface of titanium immediately
builds up an oxidation layer in presence of oxidation means protecting the material beneath
against corrosion.
The technological characteristics of low-alloy titanium G7 are equal to those of plain titanium of
the same strength category. Adding approximately 0.2 % palladium does not influence the
mechanical properties, but also adds considerably to the corrosion resistance of plain titanium.
So titanium G7 has proved to be extremely suitable for use in hydrochlorid or sulphuric acid
solutions with little concentration as well as – with due care – in oxalic acid.
A wide range of applications is possible in aggressive media an zones endangered by sea water.
Please note that physical contact between titanium and magnesium, aluminium, copper or their
alloys might lead to increased electrolytic corrosion of these materials.