From the article you will learn the difference between a displacer level transmitter and a float switch and which one to choose for your application. Check it out!
A diver is a traditional liquid level transmitter which detect liquid level using electrical or pneumatic technology. It is mounted in a vessel called a diver chamber, mounted on top of the tank or in a side measuring chamber. It consist displacer element which is suspended from a hanger with a torque tube thus producing a proportional output signal. The displacer length is determined by the operating range.
The displacer level transmitter, due to its robust design, finds its use in applications where high pressure and temperature conditions prevail, as well as with corrosive liquids.
Another advantage is its simple operating principle based on Archimedes' law. Moreover, due to its widespread occurrence, this device is well known to maintenance services.
However, often the benefits of these advantages outweigh the troubles caused by the nuisance disadvantages of the displacer level transmitter, such as:
non-resistance to changes in process fluid density
tendency to stick
sensitivity of the measurement to vibrations of the measuring installation
susceptibility to overgrowth of core and torsion springs (mechanical suspension system)
relatively long measuring response time
The float switch operates, like a plunger transducer, on the basis of Archimedes' buoyancy law.
In JUMO NESOS devices, a float with an integrated magnet uses its magnetic field to switch one or more reed contacts at increasing or decreasing levels. Alarms, pumps, signal lamps, valves and horns are usually switched using a contact protection relay.
Divers and float switches therefore share the advantage of a simple and easy-to-understand operating principle. Furthermore, they are not burdened with many of the disadvantages of plunger transmitters.
The float switch, like the displacer level transmitter, works on the principle of Archimedes' law
The float switches of the JUMO series offer advantages such as:
accurate measurement in process liquid regardless of foam formation, conductivity/conductivity or pressure ratio
applicability over a wide temperature range from -52 to 240°C
cost-effective installation and assembly
very good price/quality ratio
high switching point accuracy of ±2 mm.
switching operation is contactless, wear-free and does not require auxiliary energy
In addition, we have versions of float switches with approvals for use in shipbuilding and/or hazardous areas, as well as a certificate of conformity to the Pressure Equipment Directive (PED).
Float switches from the JUMO NESOS range have numerous certifications and approvals