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3.4 Sensor lining
The sensor lining material shall be chosen with respect to the type and properties of the measured fluid.
In cases of the meter application in chemical or food-processing industries, the user should consult the
choice of the best suitable lining with the meter manufacturer.
The sensors used with flowmeters FLONET FH30xx can be supplied lined with one of the following
materials:
• Soft rubber
• Hard rubber
• Hard rubber for drinking water
• PTFE
• E-CTFE
General properties
Soft rubber (SR)
Soft rubber is a material with high resistance to abrasion. It is recommended for less chemically
aggressive operating environments (fluids) containing abrasive particles. This material is also noted for
good resistance to dilatations and rapid temperature
Hard rubber (HR)
Material is suitable for medium-aggressive liquids with operating temperatures in the range of 0
to + (hot service water, condensate and similar fluids).
Hard rubber for drinking water (SPR)
Lining material is suitable for most applications in water management and water supply systems. Here
hard rubber shall be certified for safe contact with drinking water. It is also recommended for medium-
aggressive liquids with operating temperatures from 80
PTFE
PTFE lining is suitable for applications in chemical and food-processing industries. It can also be used
with aggressive liquids at operating temperatures ranging from
PTFE lining can also be used in applications with the occurrence of underpressure 0 to 0,5
nt is required.
E-CTFE
Chemical resistance of this type of lining is similar to that of PTFE. E-CTFE lining is suitable for
applications in chemical industry where the temperatures of the operational fluid range from
3.5 Electrode materials
Standard materials for the measuring and grounding electrodes:
• Stainless steel 1.4571 (in combination with lining materials SR, HR or SPR)
• Hastelloy C276 (in combination with lining materials PTFE or E-CTFE)
Optional materials:
• Hastelloy C276
• Titanium
• Tantalum
• Platinum and Rhodium
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