Float Sensor Contact Type CSSP

🔍 Overview
The Float Sensor Contact Type (CSSP) is a liquid level detection device that operates using a mechanical float and electrical contact mechanism.
Detects:
Liquid level (HIGH / LOW)
Output:
Digital ON/OFF signal
Designed for:
Tank level monitoring
Overflow / dry-run protection
👉 It is a simple, reliable, and non-complex level sensing solution.
⚙️ Working Principle
🧠 Buoyancy-Based Operation
A float (hollow structure) rests on the liquid surface
As liquid level changes:
Float moves up or down
🔄 Contact Switching Mechanism
Internal Structure
Float contains a magnet
Inside the stem is a reed switch (magnetic switch)
Operation
Liquid level rises → float moves up
Magnet approaches reed switch
Reed switch closes or opens
Electrical output changes state
👉 Acts as a level-triggered switch.
📊 Output Characteristics
Digital Output
Two states:
ON (closed contact)
OFF (open contact)
Contact Types
Normally Open (NO)
Normally Closed (NC)
👉 Behavior depends on installation orientation.
⚡ Electrical Characteristics
Works as a passive switch
No power required for sensing itself
Typical ratings:
Voltage: up to ~100V–220V (depends on model)
Current: typically < 0.5A
🔧 Mechanical Components
Float (plastic or stainless steel)
Stem (housing reed switch)
Magnet inside float
Electrical leads / terminals
🎯 Detection Characteristics
Level Detection
Detects specific fixed liquid level point
Switching Action
Instant ON/OFF switching at threshold
Response
Mechanical movement → very fast switching
🔄 Operating Behavior
✔ Level Rise
Float rises → switch changes state
✔ Level Fall
Float drops → switch returns to original state
✔ Orientation Effect
Inverting the sensor can:
Change NO ↔ NC behavior
🌡️ Environmental Characteristics
Suitable for:
Water
Oils
Non-corrosive liquids
Material Considerations
Depends on:
Float material (plastic/SS)
Chemical compatibility
⚠️ Limitations
Only detects single point level (not continuous measurement)
Mechanical movement may:
Wear over long time
Not suitable for:
Highly viscous liquids
Strong turbulence environments
🔌 Typical Connection
Two wires:
Acts like a switch in circuit
🧩 Functional Role
The sensor acts as a:
Level switch
Overflow protection device
Dry-run protection sensor
🏁 Summary
The Float Sensor Contact Type (CSSP) is a simple mechanical liquid level switch that:
Uses float + magnet + reed switch mechanism
Provides digital ON/OFF output
Requires no active electronics
Offers reliable and low-cost level detection
Is ideal for tank monitoring and safety systems