Buoyancy principle
A displacer suspended by a spring, so agitation and foam do not upset the reading as they would a float.
Buoyancy switch
Displacer Level Switch
A spring-supported displacer measures buoyancy rather than relying on a free-moving float. That makes it useful when the liquid is moving, foaming or viscous.
- Max. length
- 15 m
- Max. temperature
- 200 °C
- Max. pressure
- 40 kg/cm²
- Displacers per unit
- up to 3
Overview
When a normal float is not enough
A spring-supported displacer measures buoyancy rather than relying on a free-moving float. That makes it useful when the liquid is moving, foaming or viscous.
When the liquid rises the displacer loses weight, causing the spring to retract slightly to a new equilibrium position. This retraction interchanges the position of the magnet provided at the top and actuates the switch. Up to three independent switch junctions are available in a single unit, with a broad choice of operating sequences.
Economical for large vessels, and easily transported.
Difficult media
Best for agitated liquids such as paints and varnishes, heavy oil and foaming liquids.
Up to three displacers
Single or multiple displacers, to a maximum of three, with a broad choice of operating sequences in one unit.
Adjustable on site
The switch position can be adjusted at site depending upon the requirement, anywhere along the rope.
Technical particulars
Site, process and instrument data
| Type | Displacer |
|---|---|
| Principle | Buoyancy; displacer suspended by a spring |
| Displacer material | SS 304 / SS 316 / PP / PTFE |
| Shape of displacer | Cylindrical |
| Number of displacers | One / two / three |
| Mounting | Top of the tank, flange mounted |
| Standard length | Up to 15 metre; rope length as per requirement |
| Enclosure | Cast Al. alloy, weatherproof / ex-proof. IP56 / IP65 / Ex-proof IIA and IIB or IIC |
| Switching | Micro switch operated, rated at 5 or 15 Amp 220 VAC |
| Max. temperature | 200 °C |
| Max. pressure | 40 kg/cm² |
| Density of fluid | 700 kg/m³ and above |
| Ambient temperature (max) | 55 °C |
| Relative humidity | 100% RH (max) |
| Material of construction | MS, SS304 / SS316 or PP |
The instrument can be used for level switching in large tanks up to 15 m, in turbulent liquids and even without steel pipes. The displacer is adjustable at any point.
Describe what the liquid is doing
Tell us the medium, specific gravity, tank height, pressure, temperature and required switch points. We will confirm the displacer size and suspension.
- Fluid, specific gravity and concentration
- Flow or level range, and line size
- Operating pressure and temperature
- Material of construction and end connection
- Output, display and area classification