Manufacturer of inorganic
chemicals,William Blythe,
employs a number of
pressure transmitters on a
plant used to manufacture a
halide compound, the
corrosive nature of which
previously meant two or
three transmitters of the eight
installed needed to be
replaced every 12 months. As
the transmitters were based
on 4-20mA signalling, there
was also no diagnostic information,
so failure would
occur without
warning.

WH Good
Automation, an
ABB
Instrumentation
Alliance member,
identified a solution
in the form of
ABB 264HD
pressure
transmitters.

These have a Hastelloy
2000 seal, which is
impervious to the type
of damage caused by
the chemicals. The first
one was installed nearly
two years ago and
during inspection the
seals have proved to have
maintained their integrity.

The ABB products have
also proved more
stable than the
previous
transmitters, which
often drifted.