Product Overview
The BBMU-BD-B detects liquid, air, and bubbles in plastic tubing and can also provide wet/dry or liquid/empty status detection. It uses non-invasive ultrasonic sensing, with the piezoelectric transducers and electronics potted inside the housing for fixed integration into medical equipment, dispensing systems, semiconductor equipment, food-processing machines, and other automated fluid systems.
Multiple tube sizes, mounting arrangements, output circuits, output logic options, status indicators, and cable configurations are available. Selection is based on tube material, outside diameter, wall thickness, and liquid properties.
Key Features
- Non-invasive ultrasonic detection with no fluid contact
- Detection of bubbles, air, empty tubing, and liquid presence
- Typical air-detection response of approximately 215 μs
- Typical liquid-recovery response of approximately 46 ms
- NPN, PNP, and TTL output options
- Optional red/green status LED and electronic self-test
- Potted piezoelectric transducers and electronics
- Compatibility with multiple plastic and elastomeric tube materials
General Specifications
| Parameter | Specification |
|---|---|
| Detection principle | Non-invasive ultrasonic detection |
| Detected conditions | Liquid / air or bubble / empty tube |
| Minimum detectable bubble | Typically approximately 70% of tube inner diameter; application dependent |
| Air-detection response | Approximately 215 μs, wet to dry |
| Liquid-detection response | Approximately 46 ms, dry to wet |
| Supply voltage | 5 to 24 VDC, depending on output configuration |
| Output | NPN, PNP, or 5 V TTL |
| Maximum output current | 50 mA |
| Current consumption | ≤50 mA |
| Operating temperature | 5 to 60 °C |
| Storage temperature | -20 to 70 °C |
| Operating humidity | 10% to 90% RH |
| Housing material | Black ABS |
| Cable | 4 × 28 AWG; standard length approximately 300 mm |
| Self-test | Optional electronic self-test input |
Tube and Mechanical Configurations
| Configuration | Tube outside diameter | Mounting | Protection rating |
|---|---|---|---|
| Configuration 1 | 3.18 mm (1/8 in) | Through-hole mounting | IP67 |
| Configuration 2 | 7.92 mm (5/16 in) | Through-hole mounting | IP67 |
| Configuration 3 | 3.18 mm (1/8 in) | Compact housing with M2.5 threaded inserts | IP65 |
| Configuration 4 | 4.0 mm | Compact housing with M2.5 threaded inserts | IP65 |
Output Configurations
| Output type | Supply | Output characteristics |
|---|---|---|
| NPN | 5 to 24 VDC | High > VCC – 0.5 V; low < 0.6 V |
| PNP | 5 to 24 VDC | High > VCC – 0.5 V; low open circuit with 10 kΩ pull-down |
| TTL | 5 VDC | High > 4.3 V; low < 0.6 V |
The default logic can be configured as high for liquid and low for air, or inverted to low for liquid and high for air.
Tube and Liquid Requirements
- PVC, PE, silicone, PUR, and other validated plastic tubing
- Recommended wall thickness of 10% to 20% of tube outside diameter
- Smooth outside surface; fabric-reinforced tubing is not recommended
- Sufficient tube elasticity for stable contact with the sensing channel
- Blood, plasma, saline, water, and other low-viscosity liquids
Applications
- Medical instruments, infusion pumps, and syringe pumps
- Hemodialysis and blood-processing equipment
- Biotechnology, DNA-analysis, and immunoassay equipment
- Dispensing and precision-fluid-control systems
- Semiconductor-processing equipment
- Food-processing and automated fluid systems
Selection Information
For selection, provide a tube sample or specify the tube material, outside diameter, wall thickness, liquid, supply voltage, output type, output logic, self-test requirement, LED requirement, and cable length.