Switches offer safe and reliable operation
Published: 17 July 2012 - Michelle Lea
ABB has added pressure and temperature switches to its measurement products range, enabling safe and reliable control of pressure and temperature in a range of industrial applications, including extreme conditions.
The BETA switches are certified to leading international standards, and the range includes pressure, differential pressure, vacuum and temperature switches, so they are suitable for measuring fluids and gases in a variety of applications.
The switches incorporate a self-aligning, piston sensor for 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 and are available in a range of materials.
The spring-loaded piston features resistance to shock and vibration, while the flexible, strong mounting bracket avoids pipe strains and consequent movement. 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 a built-in sealed two-phase temperature sensor for use in gas and fluid applications. As the temperature of the process increases, the vapour pressure of the liquid also increases. If the vapour pressure exceeds the setpoint of the pressure switch, then the switching element will be actuated.
Manufactured from 316 stainless steel, the temperature switch sensors can be fitted into standard thermowells of up to 10mm bore, or can be direct or capillary mounted.
T: 0870 600 6122