How to select a level measurement instrument which fits for your application.
Consider the following things
1.What is the material to measure
2.Contacting or non-contacting measurement required
3.What are the temperature and pressure ranges
4.What is the distance of measurement
5.Is it an open air or closed vessel application?
Application type - Level,Interface,Flow,Pump control,Volume,Weight
Physical arrangement - Process connection available (Nozzle length and width) internal geometry,external geometry
Application Criteria - Vapors,Dust,density,foam,viscosity,Specific Gravity
Electric Supply - AC,DC,4 wire,2 wire (loop powered)
Communications - 4-20,Modbus,HART,PA,FF,devicenet,Relays
Diagnostic desire - Local,PDM,Pactware,HART.
Area Classification - General Purpose,Intrinsically Safe,Explosion Proof