Float Level Switch
Product Overview
A Float Level Switch is a simple and reliable point level device used to detect the presence or absence of liquid at a specific level in a tank, vessel, or sump. It operates using a buoyant float that moves at the liquid level and activates an electrical switch when a preset level is reached. Float level switches are widely used for level alarms, pump control, and safety interlocks in industrial and commercial applications.
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How it works (simple explanation)
A float moves up and down with the liquid level.
When the liquid reaches a set level, the float changes position.
This movement mechanically or magnetically activates an internal switch (reed switch or microswitch).
The switch sends an electrical signal to start/stop a pump, trigger an alarm, or control a process.
What it measures
- Point level detection (High level or Low level)
- Liquid presence or absence at a fixed point
Key advantages
- Simple and robust design
- Highly reliable and proven technology
- No external power required for switching
- Suitable for harsh and dirty liquids
- Low cost and minimal maintenance
- Easy installation and operation
Applications
- Water and wastewater tanks
- Pump control in sumps and wells
- High/low level alarms
- Oil and fuel tanks
- Chemical and process vessels
- HVAC and cooling systems
- Food and beverage storage
Installation
- It can be installed vertically or horizontally, depending on model
- Mounted through tank top, side, or bottom
- Ensure float has free movement without obstruction
- Set switching point by float position or orientation
- Electrical wiring according to NO/NC configuration
Technical Specifications
Parameter | Specification |
Measurement Type | Point level (ON/OFF) |
Measured Media | Liquids |
Switching Output | SPST / SPDT (NO or NC) |
Contact Rating | 5 A @ 250 VAC (typical) |
Operating Pressure | Up to 10 bar (model dependent) |
Operating Temperature | -20 °C to +120 °C |
Wetted Materials | Stainless steel, PP, PVC |
Mounting Type | Vertical / Horizontal |
Process Connection | Threaded (½”, ¾”, 1″) or flange |
Protection Class | IP65 / IP68 |
Power Supply | Not required (mechanical switching) |