Non-Contact Liquid Level Detection
The liquid level alarm kit consists of three main components: a power supply, an alarm unit, and a liquid level sensor.
Using advanced signal processing technology, the sensor detects liquid through non-metallic container walls without direct contact with the liquid or the need to drill holes.
It supports a variety of non-metallic container materials, including plastic, glass, and ceramic, and can be used on flat, curved, and cylindrical surfaces, depending on the probe model.
Important: The liquid must be electrically conductive, and the container wall must be non-metallic.
Signal Output Options
| Output Type | Description | Application |
|---|---|---|
| V – High/Low Level Output | Provides a high/low logic-level signal for MCU or microcontroller GPIO inputs. Cannot directly drive PLC inputs or relay coils. | DIY electronics, microcontroller projects, and signal monitoring |
| NPN – Active-Low Output | Normally open (NO): outputs a low-level signal when liquid is detected; the output is open when no liquid is detected. | Liquid detection and external control circuits |
Probe Model Comparison
| Specifications | Y25 | Y26S | Y26A | Y29A |
|---|---|---|---|---|
| Recommended Application | Flat container walls | Tubing ≥12 mm | Small tubing, 5–10 mm OD | Flat container walls |
| Container Wall Thickness | ≤20 mm | — | — | ≤10 mm |
| Compatible Tube Diameter | — | ≥12 mm | 5–10 mm OD | — |
| Level Detection Accuracy | ±1.5 mm | ±1.5 mm | ±1.5 mm | ±3 mm |
| Response Time | 500 ms | 500 ms | 500 ms | 100 ms |
| Output Type | NPN / V | NPN / V | NPN / V | NPN / V |
| Cable Length | 1 m (±10 mm) | 1 m (±10 mm) | 1 m (±10 mm) | 1 m (±10 mm) |
| Waterproof Rating | IP67 | IP67 | IP67 | IP67 |
| Operating Temperature | −20°C to +105°C | −20°C to +105°C | −20°C to +105°C | −20°C to +105°C |
| Housing Material | Flame-Retardant PC-V0 | Flame-Retardant PC-V0 | Flame-Retardant PC-V0 | Flame-Retardant PC-V0 |
| Environmental Compliance | RoHS 2.0 | RoHS 2.0 | RoHS 2.0 | RoHS 2.0 |
| Safety Certification (Supplier-Listed) | CE | CE | CE | CE |
Notes: Tube diameter refers to the outside diameter (OD). Cable lengths can be customized for bulk orders.
Choose when the alarm sounds
- High-level warning: choose the full-level alarm kit. It is intended to warn when liquid reaches the sensor position. Mount at the desired upper warning point, allowing an appropriate margin below overflow.
- Low-level warning: choose the low-level alarm kit. It is intended to warn when liquid falls below the sensor position. Mount at the desired refill warning point.
These are separate purchase configurations. A user-selectable mode switch, automatic pump control and automatic shutoff are not specified. NPN and V describe the probe output interface; they do not universally mean high-level and low-level alarm.
Compare the eight kit options
| Current option | Application and alarm | Probe DC supply shown in supplier option |
|---|---|---|
| Y25-NPN / Full-level alarm | Y25 · Flat tank · High-level alarm | 5–12 V DC |
| Y25-V / Low-level alarm | Y25 · Flat tank · Low-level alarm | 5–24 V DC |
| Y26S-NPN / Full-level alarm | Y26S · Curved wall / tube · High-level alarm | 5–12 V DC |
| Y26S-V / Low-level alarm | Y26S · Curved wall / tube · Low-level alarm | 5–24 V DC |
| Y26A-NPN / Full-level alarm | Y26A · 5–10 mm OD tube · High-level alarm | 5–12 V DC |
| Y26A-V / Low-level alarm | Y26A · 5–10 mm OD tube · Low-level alarm | 5–24 V DC |
| Y29A-NPN / Full-level alarm | Y29A · Flat tank / residue · High-level alarm | 12–24 V DC |
| Y29A-V / Low-level alarm | Y29A · Flat tank / residue · Low-level alarm | 12–24 V DC |
Package contents
- One BJ12 alarm in the selected warning configuration
- One selected probe with 1 m cable
- One Chinese-standard power adapter
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