The 52mm PP Liquid Water Level Sensor is a compact, vertical-mount float switch designed for precise level detection in small to medium-sized tanks. Because it is made from Polypropylene (PP), it is highly resistant to corrosion and is safe for use with water, mild acids, bases, and food-grade liquids.

The "Down" designation typically refers to the mounting style (installed through the bottom or top of a tank) or the default "Normally Closed" (NC) logic that triggers as the float moves downward.

 Features & Functionality

• Magnetic Reed Technology: The stem contains a sealed reed switch, and the round float contains a permanent magnet. As the float rises or falls with the liquid, the magnetic field opens or closes the switch.

• Reversible Logic: One of the best features of this design is that you can usually reverse the logic. By simply removing the "C-clip" at the bottom, flipping the float upside down, and putting the clip back on, you can change the switch from "Normally Open" to "Normally Closed."

• Compact Footprint: At only 52mm long, it is perfect for tight spaces where a large cable-style float switch (like the MAC3) wouldn't fit.

• Hermetically Sealed: The electrical contacts are completely isolated from the liquid, preventing oxidation and ensuring a long service life.

Common Applications

• Hydroponics & Aquariums: Maintaining water levels in nutrient reservoirs or fish tanks.

• Water Purifiers: Acting as a high-level cut-off for small RO storage tanks.

• Condensate Pumps: Detecting when air conditioner drain pans are full.

• Automotive: Monitoring washer fluid or coolant levels (in non-pressurized tanks).

• Humidifiers: Preventing the heating element from burning out when the water runs dry.

⚠️ Important Wiring Note

Do Not Connect Directly to a Pump! The internal reed switch is designed for signal current only (0.5A). Attempting to power a water pump or a motor directly through this switch will weld the contacts shut instantly.

• Correct Setup: Use the float switch to trigger a Relay or an Arduino input, which then toggles the high-power device.