Pneumatic displacer transmitter APM Modulevel® utilizes buoyancy force acting on immersed displacer in the liquid to detect and convert liquid level changes to proportional pneumatic signal output.

Operating principle is based on conversion buoyancy force of medium during level change to linear movement of displacer which due to magnetic coupling is converted then to rotary movement of mechanism which regulates proportionally pressure in the pneumatic system.

Typical applications for pneumatic displacer transmitter are feedwater heaters, steam drums, deaerators and hot wells.

Advantages  

Measuring ranges: up to 3 m
Medium temperature: -100 do 370 °C
Maximum pressure: up to 294 bar
Medium density: 0,11 to 2,2 kg/dm³
Minimum medium density difference for interface: 0,10 kg/dm³
Transmitter housing can be dismantled without depressurizing the vessel
360° rotable housing simplifying pneumatic piping hookup
Easy calibration with no need for level simulation
Accurate output signal provided over a wide specific gravity range
Pilot relay provides amplification of pilot pressure signal to speed valve response 
Optional pneumatic to current interface transducer for use in electronic control applications
Optional differential gap (on-off) control
Optional Hi-Lo liquid level electronic alarm signal
Available direct mounting and caged versions