Junray ZR-5041 Orifice Flow Calibrator

Overview

The Junray ZR-5041 Orifice Flow Calibrator is a portable, field-deployable instrument engineered for traceable calibration of gas sampling flow rates across environmental monitoring, occupational health, and research applications. It operates on the critical-flow orifice (CFO) principle—where laminar-to-choked flow transition at a precisely manufactured orifice plate enables direct correlation between differential pressure and volumetric flow under defined thermodynamic conditions. Unlike thermal mass flowmeters, the ZR-5041 provides primary-standard-referenced calibration by leveraging orifice geometry, fluid properties (air as default medium), and real-time temperature/pressure compensation. Its design targets compliance with Chinese national environmental standards—including HJ/T 368–2007 for TSP sampler calibration—and aligns with metrological requirements outlined in JJG 640–2016 (differential-pressure flowmeter verification) and JJG 680–2021 (smoke particulate sampler verification). The device functions as both a standalone calibrator and a verification tool for fixed-interval quality assurance in GLP-aligned laboratories and field QA/QC programs.

Key Features

• 5-inch high-resolution capacitive touchscreen interface with intuitive icon-driven navigation and multilingual menu support (English firmware available)
• Integrated dual-sensor architecture: high-stability differential pressure transducer and compensated PT100-compatible temperature measurement circuitry (±1 °C max error at 25 °C)
• Real-time concurrent display of working-condition flow (L/min), standard-condition flow (N·L/min at 0 °C, 101.325 kPa), and instrument-scale flow (calibrated analog equivalent)
• Automated calibration routines preconfigured for widely deployed samplers: Thermo Scientific 3922/3923/3924 series, Sartorius 3712/3713/3714, and TSI 3260 family—each routine stores full audit trail including date, operator ID, ambient conditions, and deviation metrics
• Onboard time-weighted averaging function: user-definable duration (1–9999 s) computes arithmetic mean of all recorded flow points with timestamped metadata export capability
• Rechargeable lithium-ion battery pack delivering >8 hours continuous operation at 25 °C; cold-start functional down to −20 °C with thermal hysteresis <±2% full-scale after stabilization
• Bluetooth 4.2 Class 2 module supporting wireless pairing with certified thermal printers for immediate hardcopy generation of calibration certificates (PDF/CSV export via optional USB-C adapter)

Sample Compatibility & Compliance

The ZR-5041 is validated for use with low-to-medium flow-rate gas sampling systems operating in the range of 0.1–30 L/min, including but not limited to VOC adsorption tube samplers (per HJ 644–2013), PM_2.5/PM₁₀ gravimetric samplers (HJ 93–2013), TSP weight-based collectors (HJ 1263–2022), fluoride filter samplers (HJ 955–2018), and stack emission analyzers (JJG 1169–2019). Its orifice geometry and pressure sensing meet the dimensional tolerances and uncertainty budgets specified in HJ/T 368–2007 for orifice-type flow reference instruments. All internal algorithms apply ISO 5167–2:2003-compliant discharge coefficient corrections and incorporate iterative iteration for compressibility (Z-factor) and viscosity adjustments when non-air media are selected via configuration mode. Device firmware supports configurable reporting formats aligned with ISO/IEC 17025 documentation requirements for accredited calibration labs.

Software & Data Management

Firmware v3.2+ includes embedded data logging with non-volatile memory retaining ≥10,000 calibration records, each tagged with UTC timestamp, GPS coordinates (optional external module), operator code, and environmental parameters. Export protocols support USB mass storage mode (FAT32) and Bluetooth SPP for seamless integration into LIMS environments. Audit trail functionality complies with FDA 21 CFR Part 11 principles: electronic signatures, role-based access control (admin/operator modes), and immutable record locking upon finalization. Calibration certificate templates follow HJ/T 368–2007 Annex B structure and include uncertainty budget breakdown per GUM (JCGM 100:2008). Firmware updates are delivered via signed .bin files with SHA-256 hash verification.

Applications

• Field verification of ambient air samplers prior to deployment in EPA-equivalent monitoring networks
• Periodic recalibration of workplace exposure monitors used in OSHA-regulated industrial hygiene programs
• Performance validation of stack testing equipment during Method 5/Method 26A audits
• Research-grade flow characterization in aerosol generation chambers and inhalation toxicology setups
• Teaching laboratory implementation for metrology courses covering orifice flow theory, Bernoulli correction, and ISO 5167 traceability chains

FAQ

What flow ranges does the ZR-5041 support?
The instrument is optimized for volumetric flow rates from 0.1 to 30 L/min at ambient conditions. Extended-range orifice kits (sold separately) enable coverage up to 100 L/min.
Does it support calibration of mass flow controllers (MFCs)?
Yes—when configured with known gas composition and operating pressure, the ZR-5041 can serve as a transfer standard for MFC linearity and zero-point verification per JJG 1056–2018.
Is NIST-traceable calibration documentation included?
Each unit ships with a factory calibration certificate referencing NIM (National Institute of Metrology, China) standards; optional UKAS-accredited calibration with CMC statement available upon request.
Can it operate without internal battery power?
Yes—DC 12 V input via barrel jack enables continuous operation during benchtop use or vehicle-mounted deployments.
How is temperature compensation implemented?
Using dual-point PT100 emulation with built-in cold-junction compensation and polynomial curve-fitting (ITS-90) across −20 °C to +50 °C.