Photoelectric sensor | through-beam type | for liquid detection | 6–13mm | 16×17.2×26mm | 10–30VDC | NO/NC | NPN | 2m cable | PBT | infrared | IP50

Technical specifications
Detection type: Through-beam
For pipes: Outer diameter Ø6–13 mm, wall thickness ≤1.0 mm
Light source: Infrared (940 nm)
Output type: NPN, NO/NC (switchable via DIP switch)
Response time: < 1 ms
Supply voltage: 10…30 V DC
Current consumption: ≤20 mA
Load current: ≤100 mA
Voltage drop: ≤2.5 V
Protection: Reverse polarity protection
Indicators: Red LED – output
Light interference resistance: Sunlight or lamp light < 3000 lx
Operating temperature: -10…+50 °C
Humidity range: 35–85% RH
Protection class: IP50
Housing: PBT
Connection: 2m PVC cable
Dielectric strength: 500 V AC, 50/60 Hz, 60 s
Insulation resistance: ≥50 MΩ (500 VDC)
Vibration resistance: 1.5 mm amplitude, 10–50 Hz (2h each direction X/Y/Z)

Functions and operating principle
The sensor operates on a through-beam principle – infrared light passes through the pipe and reflects differently depending on whether liquid is present inside.
The system quickly detects light changes and determines the presence or absence of liquid, activating the output signal.

Use and applications
For home users or DIY: Suitable for monitoring liquid levels in aquariums, humidifiers, or cooling systems.
For engineers / automation specialists: Ideal for automated systems requiring fast and reliable liquid detection through pipes (e.g., dosing, filtering, or cooling lines).
For electricians / technicians: Used in process control systems; can be integrated with PLCs, signal modules, or control relays.

Advantages

Arc-shaped design – easy and stable installation

Fits transparent pipes of various diameters (Ø6–13 mm)

Fast response time

Resistant to vibration and ambient light

Disadvantages

Not suitable for opaque pipes

IP50 protection – not resistant to direct water exposure