YINHEKEJI FCG-5H Intrinsically Safe Constant-Flow Air Sampler

Overview

The YINHEKEJI FCG-5H Intrinsically Safe Constant-Flow Air Sampler is an engineered solution for occupational hygiene and environmental air monitoring in hazardous locations requiring certified explosion protection. Designed in strict compliance with national standards GB50325-2010, GB/T 17061-1997, HJ/T 400-2007, and JJG 956-2013, the instrument implements electronic closed-loop flow control to maintain precise volumetric sampling across a wide dynamic range — from low-flow volatile organic compound (VOC) collection at 10 mL/min to high-flow respirable dust filtration at up to 5000 mL/min. Its core operating principle relies on a microprocessor-regulated brushless DC vacuum pump coupled with a calibrated digital thermal mass flow sensor, enabling true constant-flow performance independent of filter loading or backpressure fluctuations up to 35 kPa. The device is certified to Ex ib IIB T3 Gb — indicating intrinsic safety for use in Zone 1/21 gas and dust environments where flammable vapors (e.g., hydrocarbons, solvents, alcohols) or combustible metal/coal dust may be present. It supports both personal (belt-mounted) and area (tripod-mounted) sampling configurations per GBZ/T 160.XX-2007 and GBZ/T 192 series standards.

Key Features

• Intrinsically safe design certified to Ex ib IIB T3 Gb — fully compliant with IEC 60079-0 and IEC 60079-11 for use in potentially explosive atmospheres.
• Twelve selectable flow ranges spanning 10–5000 mL/min, each programmable in discrete steps (10–100 mL/min increments depending on range), eliminating mechanical flow valves and reducing calibration drift.
• Integrated ambient sensor suite: real-time measurement and display of ambient temperature (−10 °C to +50 °C) and barometric pressure (60–110 kPa), enabling automatic volume correction to standard conditions (STP or SATP).
• High-efficiency, low-heat brushless vacuum pump with >5000 h service life under rated load; optimized for sustained operation at maximum flow and resistance without thermal shutdown.
• Rechargeable sealed lithium-ion battery pack with no memory effect, supporting >12 h continuous operation at full load (e.g., 5000 mL/min against 5 kPa backpressure), and equipped with over-current, short-circuit, and thermal protection circuits.
• Backlit graphical LCD interface showing instantaneous flow rate, cumulative sampled volume, elapsed time, remaining battery capacity, and error codes — all accessible without external software.
• Four operational modes: manual start/stop, fixed-duration timing, cyclic sampling (up to 99 loops with configurable on/off intervals), and volume-triggered termination — meeting OSHA, NIOSH, and ISO 8518 requirements for exposure assessment protocols.

Sample Compatibility & Compliance

The FCG-5H accommodates standardized sampling media per international occupational health frameworks: 37 mm conductive aluminum cyclone separators (optional) for respirable dust fractionation per ISO 7708 and GBZ/T 192.2; glass fiber, PVC, or mixed-cellulose ester (MCE) filters for total dust; sorbent tubes (e.g., activated charcoal, silica gel, Tenax) for VOCs and semi-volatiles; and impingers or diffusion samplers for reactive gases. Its flow stability (≤±5% over 1 h) and repeatability (≤±2%) satisfy the performance criteria defined in ISO 16000-2, ASTM D1357, and EN 1076 for active air sampling systems. All firmware and hardware design elements align with GLP principles — including non-volatile event logging, tamper-resistant parameter storage, and audit-ready timestamping of every sampling record.

Software & Data Management

Data acquisition is self-contained: the device stores up to 100 complete sampling sessions locally, each containing start/stop timestamps, programmed flow rate, actual mean flow, cumulative volume, ambient temperature/pressure, and battery voltage. Export is supported via USB-C interface using vendor-provided Windows-compatible desktop utility — generating CSV files compatible with industrial hygiene reporting platforms (e.g., IHSTAT, ADAM, OSHAP). No cloud dependency or proprietary drivers are required. Firmware updates preserve calibration coefficients and user settings. While the instrument does not implement FDA 21 CFR Part 11-compliant electronic signatures, its deterministic timer logic, immutable session logs, and hardware-enforced flow verification support validation under ISO/IEC 17025-accredited laboratory quality systems.

Applications

• Personal exposure monitoring for benzene, toluene, xylene (BTX), formaldehyde, and other VOCs in petrochemical, pharmaceutical, and coating manufacturing facilities.
• Respirable crystalline silica (RCS) and metal fume (e.g., chromium, nickel, manganese) sampling in foundries, welding operations, and abrasive blasting sites — using cyclone pre-separators and MCE filters.
• Indoor air quality (IAQ) surveys per GB50325-2010 and ISO 16000-2, including formaldehyde, TVOC, and PM_2.5 precursor gas screening.
• Emergency response and confined-space entry verification where explosive atmospheres require intrinsically safe instrumentation — e.g., tank cleaning, solvent recovery units, grain silos.
• Regulatory compliance audits for OEL (Occupational Exposure Limit) verification under China’s GBZ 2.1-2019 and EU’s Directive 2004/37/EC (CARCINOGENS AND MUTAGENS).

FAQ

What certifications does the FCG-5H hold for hazardous area use?
It carries the Ex ib IIB T3 Gb marking per GB 3836.1–2010 / IEC 60079-0:2017, certifying intrinsic safety for Group IIB gases (e.g., acetone, ethanol, ethylene) with surface temperature ≤100 °C in Zone 1 (gas) and Zone 21 (combustible dust) environments.
Can the FCG-5H perform volume-corrected sampling to standard temperature and pressure?
Yes — integrated temperature and barometric pressure sensors enable automatic calculation and display of sampled volume corrected to 25 °C and 101.3 kPa (SATP), or user-selectable STP (0 °C, 101.3 kPa), per ISO 10156 and ASTM D6196.
Is calibration traceable to national standards?
The built-in thermal mass flow sensor is factory-calibrated against NIM (National Institute of Metrology, China)-traceable reference standards; users may perform field verification using a primary calibrator (e.g., bubble meter or dry calibrator) per JJG 956-2013.
How is data integrity ensured during extended field deployments?
All sampling events are timestamped and stored in non-volatile memory with checksum validation; power-loss recovery preserves partial session data, and no parameters can be altered without physical keypress confirmation.
Does the instrument support simultaneous multi-range operation?
No — only one flow range is active per sampling session, selected prior to initiation; however, the 12 preset ranges cover the full spectrum from tracer gas dilution studies to high-volume dust sampling without hardware modification.