Level Measurement for Bulk Solids – Reliable Monitoring for Granules and Powders
In industrial operations, it is crucial to monitor the levels in silos, containers, and conveyors where dry bulk materials are handled. Materials such as grain, pellets, sand, coal, and granules must be carefully monitored to avoid downtime, overfilling, or running empty. One of the most reliable solutions is level switches for bulk solids, with diaphragm level switches from Elniva being a proven choice in demanding environments.
What Is Level Measurement for Bulk Solids?
Level measurement for bulk solids involves monitoring the amount of material inside a container, silo, or conveyor – and receiving a signal when a predefined level is reached. This is often done using a diaphragm level switch, where a rubber membrane is pressed by the material, activating a microswitch. Depending on placement, these switches serve as either high- or low-level alarms.
Elniva's Diaphragm Level Switches – Simple, Mechanical, and Reliable
Elniva's level switches are specially developed for dry, granular, and powdered materials. They are used for remote level monitoring in silos and can also be installed in conveyors, dryers, purification equipment, and weighing systems to provide overfill alarms.
How It Works
When the material level in the container reaches the membrane, it is pressed inward against a pressure plate. This movement activates a microswitch that sends a signal to the control system. The membrane's movement is limited to about 3–4 mm, protecting the internal components from wear or damage due to high pressure.
Pressure Compensation
To prevent false signals caused by air pressure changes behind the membrane, all models are equipped with pressure compensation. A sintered bronze filter cartridge allows air to flow in and out as the membrane moves. For installations inside containers, a compensating membrane is used instead.
⚠️ Note: Elniva’s level switches are not suitable for pressurized containers.
Products for Different Needs
NV 14P – For Heavier Materials
Item number: 181-0509
Material types: Grain, pellets, granules, coal, sand, etc.
Mounting: Directly in container wall with flange
Protection class: IP54
Temperature range: +1 °C to +60 °C
Weight: 0.8 kg
NV 14P-KM – With Compensating Membrane
Item number: 181-0511
Suitable for internal container mounting
Higher protection class: IP65
Used when filter cartridge is not applicable
NV 10P – Compact Model for Overfill Protection
Item number: 181-0507
Smaller membrane, requires higher pressure to activate
Perfect for tight spaces such as conveyors
Robust Design for Demanding Applications
Elniva’s level switches feature a die-cast alloy housing and components made from nickel-plated brass. The membrane is made of oil- and age-resistant nitrile rubber. Thanks to a smart design with mounting holes and cable glands, installation is easy – both for new systems and retrofitting.
Advantages of Elniva’s Level Switches
✅ Maintenance-free, fully mechanical operation
✅ Resistant to overpressure and material abrasion
✅ Fast and reliable signaling
✅ Long service life in industrial environments
✅ Suitable for a wide range of materials