Displacer Float Level Switch
The Displacer Float Level Switch operates on the buoyancy principle using a suspended displacer instead of a floating element. As the liquid level rises, the displacer experiences weight loss, reducing the tension on the spring mechanism. This movement actuates a microswitch, ensuring reliable high or low level indication even in challenging applications where standard float switches may not perform effectively.
This switch is ideal for applications involving foaming liquids, viscous media, or environments requiring precise level control. It offers Narrow Differential (ND) or Wide Differential (WD) switching depending on process needs, making it suitable for a wide range of industries and tank types.
Product Share on :Applications
- Large Sumps & Fuel Tanks
- Oil Sumps & Boiler Feed Water Systems
- Acid / Alkali Dosing Tanks
- Waste Water & Sewage Treatment Systems
- Effluent Treatment Plants (ETP / STP)
- Process Tanks & Storage Tanks
Working Principle
The displacer is suspended by a wire rope and connected to a spring-loaded actuator. When the liquid level rises, the displacer gets submerged and undergoes weight loss. This upward movement allows the spring to expand, moving the actuator into the magnetic field and triggering the microswitch to provide a changeover signal (SPDT/DPDT). The switch provides reliable ON/OFF control for level automation.
Switching Types: Narrow Differential (ND) & Wide Differential (WD)
Construction
The assembly consists of a standard or split displacer suspended on a high-strength SS rope, connected to a piston rod and actuator housed inside a non-magnetic barrier tube. The unit includes microswitches rated for industrial use. Displacers are available in SS304, SS316, SS316L, PP, PVDF, or PTFE depending on medium compatibility.
Enclosure Types
- Cast Aluminium: Standard
- Cast Aluminium Weatherproof
- Cast Aluminium Flameproof
Installation
- Suitable for top mounting on tanks
- Available with ASME / Table D flanges
- ND and WD switching options
- Wide differential adjustable by varying split displacer distance
- Available for tank depths up to 15 meters
Technical Specifications
| Measurement Range | 500 to 15000 mm |
|---|---|
| Enclosure Types | Cast Aluminium / Weatherproof / Flameproof |
| Switch Contact | Microswitches – 2 × SPDT (DPDT), 250 VAC / 5A |
| Displacer Type | Standard or Split Displacer |
| Displacer Material | SS304 / SS316 / SS316L / PP / PVDF / PTFE |
| Differential |
ND: 40 ± 5 mm WD: Adjustable on site |
| Wire Rope Material | SS304 / SS316 / SS316L / PP / PTFE |
| Process Connection | Flanges – CS / SS304 / SS316 / SS316L / PP / PTFE |
| Temperature Range | -20°C to 200°C (Metallic), up to 300°C with radiating fins |
| Test Pressure |
2 kg/cm² (PP/ PTFE / PVDF) Vacuum to 20 kg/cm² (Metallic) Up to 100 kg/cm² available on request |
| Minimum Specific Gravity | 0.8 (Optional: 0.5) |
Key Features
- Reliable operation in foaming or turbulent liquids
- Suitable for high temperature & high pressure applications
- Available in multiple materials and switching combinations
- Narrow (ND) & Wide (WD) differential switching options
- High-accuracy microswitch-based design
- Up to 15 m measuring range
- Custom flanges and chambers available
