SemLab CLS-24BP Contactless Liquid Level Sensor Module - 5V to 24V, Capacitive Non-Contact Liquid Detection, NPN/PNP Output

The SemLab CLS-24BP Contactless Liquid Level Sensor Module is a capacitive, non-invasive liquid detection solution designed to detect the presence of liquid through non-metallic container walls without direct contact with the fluid. By using capacitive sensing technology, the module can detect liquids through materials such as plastic, glass and acrylic, helping prevent sensor corrosion, contamination and degradation caused by direct exposure to liquids or chemicals.

The module operates from a wide 5V to 24V DC supply and provides a selectable NPN or PNP-style output, making it suitable for interfacing with PLC inputs, relays, microcontrollers and automation systems. It features an onboard sensitivity adjustment potentiometer and LED status indicator for convenient calibration. With a sensing capability through container walls up to 20 mm thick, the SemLab CLS-24BP is suitable for liquid presence detection, tank monitoring, industrial automation, chemical applications, agricultural systems and IoT projects.

Features:

1. Non-contact capacitive liquid level detection
2. Detects liquid through non-metallic container walls
3. Wide 5V–24V DC operating voltage
4. Supports selectable NPN and PNP output modes
5. Up to 20 mm container-wall sensing capability
6. Stated liquid level accuracy of ±1.5 mm
7. Fast response time of ≤800 ms
8. Up to 100 mA output drive capability
9. Built-in sensitivity adjustment potentiometer
10. Onboard LED for detection/status indication
11. 4-pin header interface for easy connection
12. Compatible with PLCs, relays, Arduino, ESP32 and other controllers
13. Open-source hardware and firmware
14. Suitable for industrial automation, IoT, agriculture and chemical applications
    

Specifications:

Parameter	Specification
Model	SemLab CLS-24BP
Sensing Technology	Capacitive, non-contact
Operating Voltage	DC 5V–24V
Standby Current	Approx. 5 mA
Maximum Wall Thickness	Up to 20 mm
Accuracy	±1.5 mm
Response Time	≤800 ms
Output Type	Open-collector transistor
Output Mode	NPN / PNP selectable
Output Drive	Up to 100 mA
Interface	4-pin header
Sensitivity Adjustment	Onboard 10kΩ trimpot
Status Indicator	LED
MCU	WCH CH32V003F4U6
Protection Rating	Bare PCB / IP00
Sensing Method	Through container wall
Recommended Containers	Glass, plastic, acrylic and other non-conductive materials

Pinout :

Pin	Label	Function
1	VIN	5–24V DC Power Input
2	MODE	Floating = NPN / GND = PNP
3	OUT	Liquid Detection Output
4	GND	Ground

For more information checkout : Contactless Liquid Level Sensor Module Wiki Page

Package Includes:

1 × SemLab CLS-24BP Contactless Liquid Level Sensor Module