Junray ZR-5031 Volumetric Flow Calibrator for Airborne Microbial Samplers

Overview

The Junray ZR-5031 Volumetric Flow Calibrator is a precision metrological instrument engineered specifically for the calibration and verification of airborne microbial samplers—commonly referred to as viable particulate samplers or active air samplers used in microbiological environmental monitoring. It operates on the orifice-based volumetric flow measurement principle, which provides traceable, repeatable, and thermodynamically stable flow quantification under both ambient and standard reference conditions (25 °C, 101.325 kPa). Unlike thermal mass flowmeters, the orifice method eliminates dependence on gas composition and temperature-dependent sensor drift, making it ideal for regulatory-compliant calibration workflows in ISO Class 5–8 cleanrooms, pharmaceutical manufacturing facilities, hospital isolation units, and biosafety laboratories. The device delivers real-time volumetric flow readings in liters per minute (L/min), automatically compensated to standard conditions (SLPM), enabling direct comparison against manufacturer specifications and pharmacopoeial acceptance criteria.

Key Features

• Orifice-based primary flow measurement architecture compliant with national metrological calibration protocols (JJF 1826–2020 and JJG (Hebei) 164–2019)
• High-stability pressure transducer with ≤±0.5% full-scale accuracy over 0.1–10 L/min range
• Low-pressure-drop design (<250 Pa at 10 L/min), minimizing backpressure interference during calibration of cascade impactors, slit-to-agar samplers, and centrifugal collectors
• Simultaneous display of actual flow (ALPM) and standardized flow (SLPM) updated every 1 second
• Dedicated quick-connect interface compatible with common sampler inlet geometries (e.g., 25 mm, 37 mm, and 47 mm OD tubing)
• Integrated rechargeable lithium-ion battery supporting ≥8 hours continuous operation; AC/DC dual-power capability
• Backlit high-contrast LCD screen optimized for low-illumination cleanroom environments
• Optional Bluetooth-enabled thermal printer for on-site calibration record generation
• Onboard non-volatile memory storing up to 500 calibration events with timestamp, flow value, and environmental parameters

Sample Compatibility & Compliance

The ZR-5031 supports calibration of all major classes of active air samplers used in GMP-regulated environments, including but not limited to: Andersen impactors, RCS® single-stage samplers, MAS-100® variants, BioStage™ systems, and custom-built impingers. Its orifice geometry and pressure-sensing configuration ensure compatibility with both suction-driven and vacuum-pump-assisted sampling architectures. The instrument conforms to national calibration standards JJF 1826–2020 and JJG (Hebei) 164–2019, which define metrological requirements for flow verification frequency, uncertainty budgets, and traceability pathways. It also aligns with the procedural framework outlined in GB/T 16293–2010 for pharmaceutical cleanroom qualification, supporting audit readiness under ISO 14644-1, EU Annex 1, and FDA Aseptic Processing Guidance. Calibration certificates issued using the ZR-5031 satisfy GLP documentation requirements when paired with validated procedures and operator training records.

Software & Data Management

Data export is supported via USB-C interface or optional Bluetooth module, generating CSV-formatted logs containing date/time stamp, measured ALPM and SLPM, ambient temperature and pressure (if external sensors are connected), and operator ID. The file structure complies with 21 CFR Part 11–compatible metadata conventions—including immutable timestamps and user-authenticated session initiation—when integrated into validated laboratory information management systems (LIMS). No proprietary software installation is required; raw files are human-readable and importable into Excel, MATLAB, or statistical process control (SPC) platforms. Audit trails are maintained locally on-device for all parameter changes, calibration events, and firmware updates.

Applications

• Routine verification of sampler flow rate prior to environmental monitoring campaigns in Grade A–D cleanrooms
• Periodic recalibration of microbial samplers between accredited third-party calibrations
• Root-cause analysis of out-of-specification (OOS) microbial recovery data linked to flow deviation
• Supporting validation protocols for HVAC system commissioning and requalification
• Training and competency assessment for QC microbiologists performing ISO 14698-1–based monitoring
• Field calibration support for mobile environmental monitoring teams in contract testing laboratories

FAQ

What flow range does the ZR-5031 cover?
It is optimized for volumetric flow rates from 0.1 to 10.0 L/min, with resolution of 0.01 L/min and maximum permissible error of ±0.5% FS.
Is the ZR-5031 suitable for use in ISO Class 5 environments?
Yes—the unit’s compact footprint (185 × 120 × 65 mm), low particulate shedding housing, and static-dissipative casing meet cleanroom handling requirements for critical zones.
Does it require annual recalibration by an accredited lab?
Per JJF 1826–2020, the ZR-5031 itself must undergo traceable recalibration at intervals not exceeding 12 months, using NIM-traceable orifice standards.
Can it calibrate samplers operating at negative pressure?
Yes—its differential pressure sensing architecture accommodates both positive- and negative-pressure sampling configurations without modification.
How is traceability established?
Each unit ships with a factory calibration certificate referencing China National Institute of Metrology (NIM) standards, with uncertainty budgets reported per ISO/IEC 17025:2017 Annex A.