Selecting Ultrasonic Level Sensors

The main questions which need to be considered before selecting a level measurement sensor:

• What are the contents being measured – liquid or solid or slurry or powder?
• Are level measurements required either continuous or point level (discrete)?
• What are the application’s minimum and maximum temperature and pressure?
• What level measurement range is required?
• What accuracy range is required?
• Is it possible to penetrate the vessel wall or be inside it?
• If liquid, is there any turbulence, foam or vapour at the surface?
• Is an integral display or remote display required?
• What kind of output / alarms are required eg analogue, relay, etc ?