‘O’ rings
Viton™ is the standard material for all of our flowmeters
although nitrile and EPDM are available as options. Due to the vast
number of differing chemicals that can be put through the flowmeter
various other elastomer materials may be available for the flowmeter
of your choice. Please contact your sales representative for technical
help on this matter.
Magnets
The standard magnet material is ceramic which has very good chemical
resistance in a wide range of fluids. They are attacked by some
very strong acids and should be replaced with coated magnets if
this is the case. The alternative coatings are PTFE and PVC depending
on the meter size or the detection method, consult your representative
for more information.
Gear material
PEEK™ is a high temperature engineering thermoplastic. It
is tough, rigid and strong with very good chemical and radiation
resistance. It retains its excellent mechanical and tribological
properties at high temperatures. This valuable combination of properties
makes PEEK™ an ideal material for our gears. The grade of
material used is carbon fibre reinforced with added graphite and
PTFE, these additives give extra strength and reduced friction but
remain captive in the material matrix and do not compromise the
chemical resistance. Alternative gear materials may be available,
contact your distributor for more details.
High temperature rotors
Because of the high temperature characteristics of PEEK™ we
can use the same material for all flowmeter temperature ranges.
The standard meter is manufactured for use up to 80°C (176°F)
but optional rotors are available for 100°C (212°F) and
150°C (318°F).
High viscosity rotors
The operation of the meter requires specially modified gears for
use with high viscosity fluids, over 1000 cps. Above this viscosity
the maximum flow capacity of the meter is reduced and the gears
are modified. The low flow capability and the overall accuracy both
improve dramatically. See the graph below for the percentage reduction
in maximum flow with these thicker fluids.

Flanges and pipe connections
The standard products are shown on the appropriate data sheets but
any meter can be manufactured with any fittings, consult your distributor
for details.
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