Description
The ZP2508 is a compact vertical-mount float switch designed for liquid level detection and control in small tanks, aquariums, water dispensers, and household appliances. It operates on a passive magnetic reed principle: a magnetic float moves vertically along the stem as liquid level changes, actuating a sealed reed switch inside the tube to open or close a circuit . The switch requires no external power for the sensing element—it is a dry contact device that simply makes or breaks a connection when the float reaches its actuation point.
The PP (polypropylene) construction provides good resistance to weak acids and alkalis, making it suitable for water-based applications and light chemical environments . With a maximum contact rating of 10W and a switching current of 0.5A, this switch is intended for low-power control circuits—it should drive a relay or PLC input rather than a pump or motor directly . The float orientation can be inverted to convert between Normally Closed (NC) and Normally Open (NO) operation . The 40cm cable length provides flexibility for routing to control panels.
Critical limitations: This is a passive switch, not a continuous level transmitter. The contact rating is limited to 10W / 0.5A—do not connect pumps, solenoids, or motors directly without a relay . The PP body is not suitable for oils, strong solvents, or concentrated acids, and the standard temperature rating is -10°C to +85°C per most supplier listings, though one Chinese manufacturer lists a narrower -10°C to +60°C for plastic versions .
Features
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Vertical Float Design: Compact cylindrical float moves along the stem for top-mounting in small tanks and reservoirs .
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PP Corrosion-Resistant Body: Polypropylene construction suitable for water and weak chemical environments; mercury-free .
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Passive Magnetic Reed Operation: No power supply required for the sensing element; the float magnet actuates the sealed reed switch .
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10W / 0.5A Contact Rating: Suitable for low-power control circuits, PLC inputs, and relay coils .
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Configurable NC/NO Operation: Contact state can be inverted by flipping the float orientation on the stem .
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40cm Cable Length: Provides routing flexibility for control panel connections (note: some listings show 36cm or 35cm) .
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Compact Size: Approximately 19mm diameter × 36mm body length, suitable for space-constrained installations .
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Wide Application Compatibility: Used in aquariums, water dispensers, humidifiers, coffee machines, and small tanks .
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | ZP2508 (verify “P25” prefix with supplier) |
| Body Material | PP (Polypropylene) |
| Mounting Type | Vertical (top-mount) |
| Max Contact Rating | 10W |
| Max Switching Voltage | 100V DC (standard); 220V DC breakdown |
| Max Switching Current | 0.5A |
| Max Carry Current | 1.0A |
| Contact Resistance | ≤100mΩ |
| Operating Temperature | -10°C to +85°C (most listings); -10°C to +60°C (one manufacturer for plastic) |
| Float Body Size | Approx. 19 × 36mm |
| Cable Length | 40cm (per your listing; other listings show 36cm or 35cm) |
| Thread Diameter | Approx. 7.5mm |
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