VELP BOD Sensor

Overview

The VELP BOD Sensor is a dedicated laboratory-grade respirometric device engineered for the accurate determination of Biochemical Oxygen Demand (BOD) in aqueous samples. Unlike traditional dilution-based methods requiring five-day incubation and manual titration, this sensor implements a closed-system, pressure-differential measurement principle grounded in dissolved oxygen (DO) consumption kinetics. It operates by monitoring the partial pressure change of oxygen within a sealed, temperature-controlled BOD bottle as microorganisms metabolize biodegradable organic matter. The integrated mercury-free electronic pressure transducer detects minute variations in headspace pressure—directly proportional to oxygen uptake—enabling quantitative BOD estimation without chemical reagents or mercury-based components. This approach aligns with modern environmental testing requirements for reduced operator exposure, improved repeatability, and alignment with green chemistry principles. The instrument is intended for use in accredited environmental laboratories, municipal water quality control facilities, and academic research settings where compliance with standardized aerobic biodegradation assessment is mandatory.

Key Features

• Mercury-free electronic pressure sensing technology ensures regulatory compliance with RoHS, REACH, and EPA Method 405.1 guidelines on hazardous substance restriction.
• Selectable BOD range configurations (90, 250, 600, and 1000 ppm) allow method optimization across diverse sample matrices—from low-strength domestic wastewater to high-BOD industrial effluents.
• Digital LCD interface provides real-time numerical readout of calculated BOD values, eliminating subjective interpretation and transcription errors.
• Automated data logging captures one BOD result per 24-hour interval, storing up to five sequential measurements internally—supporting traceable time-series analysis without external software dependency.
• Robust stainless-steel and chemically resistant polymer housing ensures mechanical durability and resistance to corrosion during repeated sterilization and prolonged incubation cycles.
• Designed for seamless integration into standard 300-mL BOD bottles compliant with ISO 5815-1:2017 dimensional specifications.

Sample Compatibility & Compliance

The VELP BOD Sensor accommodates liquid samples meeting standard pretreatment criteria outlined in ISO 5815-1:2017 and APHA Standard Methods 5210B. Compatible matrices include raw and treated wastewater, surface water, groundwater, and process effluents—with optional nitrification inhibition (e.g., allylthiourea) applicable when carbonaceous BOD (cBOD) is required. The sensor does not require sample filtration prior to analysis but assumes samples are free of particulates that may obstruct the pressure port or interfere with microbial activity. All measurements adhere to GLP documentation standards, and the device supports audit-ready record retention through its embedded timestamped memory. While not certified under FDA 21 CFR Part 11, its deterministic output format and non-editable internal log facilitate validation in ISO/IEC 17025-accredited laboratories.

Software & Data Management

Data acquisition is fully autonomous: no PC connection or proprietary software is required for basic operation. Each stored BOD value includes an embedded UTC timestamp and associated incubation duration. For advanced reporting, exported logs (via optional RS-232 or USB-to-serial adapter) can be imported into LIMS platforms or spreadsheet applications using CSV formatting. The firmware supports user-defined calibration verification routines aligned with standard glucose-glutamic acid (GGA) reference checks per APHA guidelines. Audit trails remain immutable during export, preserving data integrity for regulatory review.

Applications

• Regulatory wastewater discharge monitoring per EU Urban Wastewater Treatment Directive (91/271/EEC) and U.S. Clean Water Act NPDES permit requirements.
• Performance evaluation of biological treatment units (e.g., activated sludge, trickling filters, MBR systems).
• Environmental impact assessments for industrial effluent characterization prior to release.
• Academic and R&D studies on biodegradability kinetics of novel organic compounds and surfactants.
• Quality assurance in drinking water source protection programs assessing organic loading trends.

FAQ

What BOD standards does the VELP BOD Sensor support?
It is designed to implement respirometric BOD protocols consistent with ISO 5815-1:2017 and APHA Standard Methods 5210B.
Is temperature control integrated into the sensor unit?
No—the sensor is intended for use with externally controlled incubators maintained at 20 ± 1 °C per standard methodology.
Can the sensor be used for both cBOD and total BOD measurements?
Yes, provided appropriate nitrification inhibitors are added to isolate carbonaceous demand, following APHA-recommended practice.
Does the device require periodic recalibration?
While the pressure transducer is factory-calibrated for long-term stability, users must perform routine GGA reference checks at least weekly to verify system performance.
Is the internal memory accessible without proprietary software?
Yes—data export is supported via ASCII-formatted serial communication, enabling direct ingestion into third-party data management systems.