MesaLabs Bios Defender 510 DryCal® Volumetric Gas Flowmeter

Overview

The MesaLabs Bios Defender 510 is a precision volumetric gas flowmeter engineered for traceable, repeatable calibration of personal sampling pumps and low-to-moderate flow rate instrumentation in industrial hygiene, environmental monitoring, and occupational safety laboratories. Based on MesaLabs’ proprietary DryCal® technology — a dry, piston-based positive displacement measurement principle — the Defender 510 eliminates reliance on soap films or wet calibration media, delivering stable, contamination-free operation without consumables or fluid maintenance. Unlike thermal mass flowmeters or orifice-based devices, the Defender 510 measures actual volumetric flow by precisely timing the displacement of a calibrated piston within a sealed chamber, ensuring high reproducibility across temperature and pressure variations typical in field and lab settings. Its design complies with recognized calibration protocols cited in the OSHA Technical Manual as a primary reference method for verifying pump performance prior to air sampling campaigns.

Key Features

• DryCal® piston displacement technology — no soap solution, no evaporation drift, no cross-contamination between samples
• NIST-traceable calibration performed annually by an ISO/IEC 17025-accredited laboratory (NVLAP Lab Code 200661-0), with full audit trail documentation
• Three selectable flow ranges (L/M/H) optimized for personal sampling pumps, area monitors, and portable air samplers
• ±1% full-scale volume flow accuracy across all ranges, validated per ASTM D6196 and ISO 8573-1 metrological guidelines
• RS-232 serial interface enabling real-time data streaming and remote command control via DryCal Pro software
• Robust aluminum housing rated for field deployment; IP54 ingress protection against dust and incidental moisture
• Factory-configured for volumetric flow only — ideal for applications where standardized (mass) flow correction is not required

Sample Compatibility & Compliance

The Defender 510 is compatible with standard ¼-inch ID flexible tubing commonly used in industrial hygiene sampling trains, including conductive and non-conductive silicone, Tygon®, and PVC lines. It supports both suction and pressure-driven flow configurations without internal valving restrictions. The instrument meets requirements for GLP-compliant calibration workflows and is routinely deployed in facilities operating under FDA 21 CFR Part 11–aligned data integrity frameworks when paired with DryCal Pro’s audit-ready logging. While it does not provide temperature/pressure compensation natively (unlike the Defender 520/530+ models), its volumetric accuracy remains valid under ambient conditions conforming to ISO 8573-1 Class 4 specifications (≤25 °C, ≤60% RH). Documentation includes certificate of calibration with uncertainty budget, traceability statement, and compliance summary for internal QA audits.

Software & Data Management

DryCal Pro software (Windows-compatible) provides full bidirectional communication with the Defender 510 via RS-232. Users can initiate single-point, continuous, or burst-mode measurements; configure auto-zero routines; export timestamped CSV files containing flow rate, elapsed time, and system status flags; and generate calibration reports compliant with ISO/IEC 17025 clause 7.8. All data logs include embedded metadata: operator ID, instrument serial number, calibration due date, and environmental conditions recorded at time of measurement. DryCal Pro supports electronic signature capture and optional integration with LIMS systems through configurable COM port scripting. No cloud dependency — all processing and storage occur locally to maintain data sovereignty and regulatory alignment with EU GDPR and HIPAA-aligned environments.

Applications

• Calibration and verification of personal sampling pumps used in OSHA, NIOSH, and ACGIH-compliant exposure assessments
• Field validation of low-flow air sampling devices (e.g., sorbent tubes, filters, diffusion badges)
• Verification of flow stability in real-time particulate and VOC monitoring systems
• QC checks for laboratory fume hood face velocity and room air exchange rate instrumentation
• Supporting ISO 17025 accreditation for environmental testing laboratories performing air quality analysis
• Training and proficiency testing for industrial hygienists and EHS technicians

FAQ

Is the Defender 510 suitable for mass flow (standardized) measurements?
No — the Defender 510 reports volumetric flow only. For temperature- and pressure-compensated (standardized) flow output, the Defender 520 or Defender 530+ models are recommended.
Does the instrument require periodic recalibration?
Yes — annual NIST-traceable recalibration is recommended and supported directly by MesaLabs’ ISO/IEC 17025-accredited laboratory. Calibration certificates include measurement uncertainty budgets per GUM (Guide to the Expression of Uncertainty in Measurement).
Can the Defender 510 be used with corrosive or reactive gases?
It is intended for use with clean, dry, non-corrosive gases such as ambient air, nitrogen, and carbon dioxide. Contact MesaLabs technical support before deploying with halogenated, acidic, or solvent-laden streams.
What is the minimum measurable flow rate in the L-range?
The lower limit is 5 mL/min with a resolution of 0.1 mL/min, verified under laminar flow conditions per ISO 5167-1 Annex C guidelines.
Is DryCal Pro software included with purchase?
Yes — licensed DryCal Pro software, USB-to-RS232 adapter, and calibration certificate are supplied standard with each Defender 510 unit.