Biaozhuo DB100 Portable Flow Calibration Standard for Airborne Microbial Samplers

Overview

The Biaozhuo DB100 Portable Flow Calibration Standard is a traceable, field-deployable instrument engineered for the periodic verification and calibration of active airborne microbial samplers—commonly used in pharmaceutical cleanrooms, hospital isolation units, biotechnology laboratories, and environmental monitoring facilities. It operates on the principle of volumetric flow measurement using a high-accuracy thermal mass flow sensor, referenced against NIST-traceable standards and validated per ISO 8573-1 (compressed air purity) and ISO 14644-3 (cleanroom testing methodologies). Unlike generic flow meters, the DB100 is purpose-built to replicate the operational conditions of standard impactor-type and centrifugal-type microbial samplers (e.g., MAS-100, BioStage, SAS Super 180), delivering simultaneous real-time display of actual flow (under ambient T&P) and standardized flow (at 20 °C and 101.325 kPa), enabling direct compliance assessment with EU GMP Annex 1, USP <1116>, and ISO 14698-1 requirements for viable particle monitoring system validation.

Key Features

• High-stability thermal mass flow sensor calibrated to ±1% full-scale accuracy across three critical reference points: 28.3 L/min (standard for 6-inch agar plates), 50 L/min (common for slit-to-agar samplers), and 100 L/min (used in high-volume environmental monitoring)
• Integrated environmental compensation: simultaneous measurement of ambient temperature (±0.5 °C) and barometric pressure (±3.0 mbar) to compute standardized volumetric flow per ISO 10780 and ASTM D6196
• Compact, handheld architecture (1.5 kg) with ruggedized enclosure rated IP54 for use in controlled environments and field service applications
• Dual-power operation: supports both AC mains (100–240 V, 50/60 Hz) and internal rechargeable Li-ion battery (>4 hours continuous runtime)
• Dedicated quick-connect pneumatic interface compatible with ISO 5356-1 tapered fittings, eliminating adapter-related leakage and ensuring repeatable connection integrity during calibration cycles

Sample Compatibility & Compliance

The DB100 is validated for use with all major airborne microbial sampling platforms requiring volumetric flow verification—including but not limited to Andersen cascade impactors, RCS® single-stage samplers, Merck MAS-100 series, and Thermo Scientific AirChek™ systems. Its calibration protocol aligns with national metrological guidelines outlined in JJG 745–2019 (China National Verification Regulation for Air Sampler Calibrators) and supports audit readiness for FDA 21 CFR Part 11-compliant environments when paired with optional timestamped calibration logs. All factory calibrations are performed under ISO/IEC 17025-accredited conditions, with certificates including uncertainty budgets per GUM (Guide to the Expression of Uncertainty in Measurement).

Software & Data Management

The DB100 includes embedded firmware supporting USB-C data export in CSV format, enabling integration into laboratory information management systems (LIMS) and electronic calibration record repositories. Optional PC software provides automated report generation compliant with GLP documentation standards—including operator ID, calibration date, ambient conditions, deviation analysis, and pass/fail status against user-defined tolerance thresholds (e.g., ±5% per EU GMP Annex 1 §8.42). Audit trail functionality records all parameter changes and calibration events with immutable timestamps, satisfying requirements for regulated quality systems operating under ICH Q7 and ISO 9001:2015 Clause 7.1.5.

Applications

• Routine performance qualification (PQ) of microbial air samplers prior to environmental monitoring campaigns
• Annual metrological verification per ISO/IEC 17025 accredited calibration schedules
• Investigation of out-of-specification (OOS) microbial recovery results by isolating flow-related root causes
• Supporting risk-based validation strategies under ICH Q9, particularly for aseptic process simulation (APS) and media fill studies
• Training and competency assessment for QC microbiology personnel on sampler operational integrity

FAQ

Is the DB100 suitable for calibrating both impactor and centrifugal-type samplers?
Yes—the DB100’s wide dynamic range (20–200 L/min) and low-pressure-drop design ensure compatibility with both high-resistance impactor nozzles and low-backpressure centrifugal rotors.

Does the device meet international regulatory expectations for cleanroom airflow verification?
While not a direct airflow velocity instrument, the DB100 satisfies the volumetric flow verification requirement mandated by ISO 14644-3, EU GMP Annex 1, and PIC/S PI 007-6 for viable particle samplers.

Can calibration certificates be issued with measurement uncertainty?
Yes—certificates include expanded uncertainty (k=2) derived from sensor stability, environmental compensation residuals, and reference standard traceability, fully compliant with ILAC P14 and ISO/IEC 17025.

What maintenance is required between calibrations?
No routine user maintenance is needed; however, annual recalibration at an ISO/IEC 17025-accredited facility is recommended to maintain metrological integrity.

Is firmware upgradable in the field?
Yes—firmware updates are delivered via USB-C and preserve all stored calibration history and configuration settings.