HJ FLY-1B Pitot-Static Air Flow Meter

Overview

The HJ FLY-1B Pitot-Static Air Flow Meter is an engineered solution for direct, in-situ volumetric airflow quantification in HVAC, cleanroom, and environmental control systems. It operates on the differential pressure principle—measuring total and static pressure via a multi-point pitot-static probe array integrated into standardized flow hoods—to compute average air velocity and derive volumetric flow rate (m³/h) in real time. Unlike anemometers that report point velocities only, the FLY-1B applies spatial averaging across the entire hood cross-section, minimizing turbulence-induced errors and eliminating the need for manual traverse corrections. Designed for regulatory-grade field verification, it supports routine commissioning, balancing, and periodic performance audits of supply and return air terminals in ISO Class 5–8 cleanrooms, hospital ventilation systems, and laboratory fume hood networks. Its low-pressure-drop design (≤5 Pa) ensures minimal disruption to system airflow dynamics during measurement—a critical requirement for stable pressure-controlled environments.

Key Features

• Multi-point pitot-static sensing with automatic spatial averaging across full hood aperture (570×570 mm or 830×830 mm)
• Integrated 7.2 V rechargeable lithium-ion battery enabling ≥30 hours of continuous operation; retains stored data for up to 4 hours after power loss
• Bluetooth-enabled thermal printer with internal battery—enables wireless, outlet-free on-site reporting without cable clutter or latency
• Dual-mode display interface supporting English and Chinese languages; includes embedded temperature and relative humidity sensor for ambient condition logging
• Real-time wind speed conversion: user inputs duct or grille dimensions in setup menu; instrument auto-calculates and displays corresponding average face velocity (m/s)
• Infrared remote control for one-button start/stop, data capture, and print trigger—enhancing operator safety and ergonomics during overhead or confined-space measurements
• Adjustable mobile tripod with telescopic column (0.9 m instrument height + 2.2 m extension = 3.1 m max working height)
• Factory-calibrated using a certified 0.5-class reference wind tunnel (traceable to national metrology standards per JJG 875 and GB/T 2624)

Sample Compatibility & Compliance

The FLY-1B is compatible with standard square diffusers, grilles, and laminar flow hoods used in GMP-compliant pharmaceutical facilities, ISO 14644-certified cleanrooms, and ASHRAE 110-tested fume cabinets. It is not intended for corrosive, explosive, or particulate-laden airstreams exceeding 70% RH or operating outside 5–35°C ambient conditions. All units undergo full-range calibration at ten discrete flow points (100–3500 m³/h) against NIST-traceable reference instrumentation. Calibration certificates include uncertainty budgets compliant with ISO/IEC 17025 requirements. The device supports GLP/GMP documentation workflows: each measurement record embeds timestamp, ambient T/RH, hood ID, operator code, and calibration validity status—enabling audit-ready data export via USB or Bluetooth to Windows-based analysis software.

Software & Data Management

The included PC software (Windows 10/11 compatible) imports .csv or proprietary binary logs for batch analysis, trend plotting, and compliance reporting. It generates ASHRAE Guideline 12–2020–aligned summary reports—including airflow deviation from design setpoints, balance ratios across zones, and pass/fail flags per ISO 14644-3 Annex B criteria. Audit trail functionality complies with FDA 21 CFR Part 11 requirements: all data edits are logged with user ID, timestamp, and reason code; electronic signatures are supported. Raw pressure differential waveforms and interpolated velocity profiles can be exported for third-party CFD validation.

Applications

• HVAC system balancing and TAB (Testing, Adjusting, Balancing) in commercial and healthcare buildings
• Cleanroom airflow uniformity and total supply air volume verification per ISO 14644-3
• Fume hood face velocity mapping and alarm threshold validation (e.g., ANSI/AIHA Z9.5)
• Pharmaceutical facility qualification (IQ/OQ/PQ) under EU GMP Annex 1 and USP
• Educational lab demonstrations of Bernoulli’s principle and laminar vs. turbulent flow regimes
• Energy audit support—quantifying duct leakage and terminal inefficiencies prior to retrofit

FAQ

What standards does the FLY-1B comply with for calibration and reporting?
It follows JJG 875–2019 (Chinese national metrological verification regulation for air flow meters) and GB/T 2624–2006 (specifications for orifice plates, nozzles, and venturi tubes), with traceability to China National Institute of Metrology (CNIM). Calibration uncertainty is reported per ISO/IEC 17025.
Can the FLY-1B measure both supply and exhaust air terminals?
Yes—it supports bidirectional measurement mode and is routinely deployed on both supply diffusers and return grilles without hardware modification.
Is the Bluetooth printer compatible with iOS or Android mobile devices?
No—the printer is designed exclusively for direct pairing with the FLY-1B unit; it does not function as a generic mobile peripheral.
How is data integrity maintained during extended field use?
All measurements are stored in non-volatile memory; power interruption does not erase data within 4 hours. Each record includes checksum validation and automatic firmware-level CRC error detection.
Does the device support custom hood sizes beyond the two standard options?
No—only 570×570 mm and 830×830 mm hoods are supplied and calibrated. Use of unqualified hoods voids measurement accuracy claims and calibration validity.