ABB’s BETA pressure and
temperature switches offer safe,
reliable performance in extreme
conditions. Fully certified to leading
international standards, the range
includes pressure, differential
pressure, vacuum and temperature
switches, suitable for measuring
fluids and gases in a wide variety of
applications.

Switches have a precisely
engineered, self-aligning, piston
sensor which gives precise operation.

The limited travel in the piston, and
its direct contact with the microswitch,
allows accurate pressure
transmission and protection against
the highest over range pressure.

The piston sensor is isolated from
the process fluid by a diaphragm and
static O-Ring seal and retained by a
process connection port. These are
the only process wetted parts.

BETA switches are suitable for
safety installations and are certified
for use in SIL2 applications. The
BETA temperature switch is a pressure
switch enclosure with built-in sealed
two-phase temperature sensor for
gas and fluid applications. As the
temperature of the process increases,
the vapour pressure of the liquid also
increases. If vapour pressure exceeds
the setpoint of the pressure switch,
then the switching element will be
actuated.