Liquid leak detector BLD03

bloodfor medical devicesfor dialyzer

Overview
The optical sensor BLD03 detects non-invasively smallest traces of human blood in clear fluids inside transparent flexible plastic tubing. Tested to IEC 60601-2-16:2018, the sensor reliably recognizes 0.35 ml/min of blood at a flow rate of 800 ml/min and a hematocrit level of 32 %. Proven hardware design and advanced algorithms provide high immunity to ambient light.

Product Benefits

• Non-invasive optical sensor with wavelength adapted to blood
• Digital electronics for high detection capability
• No mechanical wear or maintenance required
• High resistance to ambient light and stray illumination
• Designed as a built-in component for integration into medical devices
• Advanced algorithms to support maximum patient safety

Key Features

• Two configurations: BLD03/I (meets high safety standards; serial or logical interface; simple commands for sensor test and sensitivity adjustment) and BLD03/M (developed according to IEC 62304:2006, AMD1:2015, software class C, for highest safety and reliability)
• Intelligent clamp-on optical sensor with remote electronics for contactless detection of transmission differences of blood in clear liquids inside transparent flexible tubing
• Optimized default configuration for detection of human blood in clear liquids on transparent flexible plastic tubing, developed for high-sensitivity requirements in dialysis and other clinical environments

Safety Features and Standards

• Internal self-test routines ensuring reliable performance of essential components
• On-site calibration at customer location to set optimal working point
• Special algorithms to evaluate measurement data plausibility
• Medical safety: IEC 60601-2-16:2018
• Electromagnetic compatibility: IEC 60601-1-2:2014 (4th ed.), AMD1:2020
• Software classification: IEC 62304:2006, AMD1:2015
• Quality management: ISO 13485 certified

Measurement Principle
The BLD03 measures transmitted light intensity through liquid-filled tubing. The measuring cell includes an LED light source and a photodiode (LDC - light to digital converter). The LDC digitally measures light intensity which is evaluated by firmware. With increasing contamination (blood) light intensity decreases due to absorption and reflection; when attenuation relative to a calibrated reference exceeds a threshold the sensor raises an alert.

Technical Data
Measurement method: Optical transmission measurement
Response time: 280 ms ± 10 ms
Measuring channel: Width: 5.0 mm; Height: 5.8 mm
Tubing: Transparent flexible plastic tubing
Tubing outer diameter: 5.5 ... 7.0 mm
Mounting: Two mounting holes (Ø = 3.2 mm)
Interfaces: BLD03/I: Serial, logical; BLD03/M: Logical
Software standard: BLD03/I: Class A; BLD03/M: Class C
Operating voltage: 3.1 ... 5.5 VDC
Operating temperature: 5 ... 50 °C
Protection class (sensor head): IP65