DDY-1.5D Portable Personal Air Sampler by Yinhé Technology

Overview

The DDY-1.5D Portable Personal Air Sampler is an engineered solution for time-weighted average (TWA) and short-term exposure limit (STEL) monitoring of airborne contaminants in occupational and ambient environments. Designed in strict compliance with Chinese national standards HJ/T 375–2007 (Environmental Air Sampler Technical Requirements), JJG 956–2000 (Verification Regulation for Atmospheric Samplers), and HBC 2–2001 (Environmental Protection Industry Standard for Air Samplers), the instrument implements constant-flow sampling via a precision-controlled diaphragm pump and microprocessor-based feedback regulation. Its operational principle relies on volumetric displacement under regulated negative pressure, enabling quantitative collection of gaseous analytes—including SO₂, CO, NO_x, VOCs, and other toxic industrial gases—onto sorbent media such as activated carbon tubes, silica gel cartridges, impingers, Tedlar® bags, or solid-phase microextraction (SPME) substrates. The device supports both personal (belt-worn) and stationary sampling configurations, making it suitable for NIOSH/OSHA method-compliant exposure assessment workflows in industrial hygiene laboratories and field deployments.

Key Features

• Microcontroller-based intelligent flow control system with real-time pressure compensation and automatic constant-flow adjustment across five selectable flow ranges (0.1–1, 0.1–1.5, 0.1–3, 0.1–4, and 0.1–5 L/min).
• High-efficiency imported diaphragm pump delivering stable vacuum ≥26 kPa and rated flow ≥1.5 L/min at 5.2 kPa backpressure; chemically resistant to acidic, alkaline, and organic vapors.
• Eight-step programmable timer with ≤0.1‰ timing deviation; supports sequential, intermittent, or continuous sampling modes.
• Integrated Φ25 mm mini-sampler head and impactor preseparator for concurrent collection of respirable suspended particulates (RSP) and gaseous fractions—enabling dual-phase sampling per ISO 7708 and EN 481.
• Universal power architecture: operates on AC 220 V / 50 Hz mains or rechargeable DC 7.2–9 V input; includes low-voltage warning, charging status indicator, and auto-shutdown protection.
• Compact ergonomic design (128 × 88 × 45 mm; 0.4 kg net weight) optimized for extended wearability during full-shift personal monitoring.
• Acoustic noise ≤50 dB(A) ensures non-disruptive operation in quiet laboratory or office-based settings.

Sample Compatibility & Compliance

The DDY-1.5D interfaces seamlessly with standardized sampling media used in accredited environmental and occupational health laboratories. It is validated for use with NIOSH Method 1005 (SO₂), 1007 (CO), 1010 (NO_x), 1501 (VOCs), and OSHA ID-121 (formaldehyde), as well as Chinese standard methods GBZ/T 160 series for workplace air toxicants. Its flow stability (≤±5%) and accuracy (<±1.5%) meet GLP requirements for data integrity in regulatory submissions. While not intrinsically safe or explosion-proof, the unit complies with GB/T 18204.2–2014 for indoor air quality monitoring and is routinely deployed in non-hazardous classified zones per IEC 60079-0. Calibration traceability follows JJF 1070–2000 (National Metrological Verification Regulation for Gas Samplers), supporting audit readiness under CNAS-CL01 and ISO/IEC 17025 frameworks.

Software & Data Management

The DDY-1.5D operates as a standalone hardware platform without embedded software or Bluetooth/Wi-Fi connectivity. All operational parameters—including start/stop time, selected flow rate, total sampled volume, and battery status—are displayed via LED indicators and manually logged. For traceable recordkeeping, users are advised to pair the sampler with calibrated dry-gas meters (e.g., Brooks 5850E) and maintain logbooks compliant with ISO 17025 clause 7.5.2 (Control of Records). Optional PC-based calibration verification tools (compatible with Windows 10/11) allow digital archiving of pump performance curves and flow deviation reports—supporting 21 CFR Part 11–aligned electronic records when integrated into validated LIMS environments.

Applications

• Occupational hygiene surveys for TWA and STEL evaluation in manufacturing, chemical processing, mining, and construction sectors.
• Indoor air quality (IAQ) assessments in schools, hospitals, offices, and residential buildings per GB/T 18883–2022.
• Field validation of fixed-site air monitors and dispersion modeling inputs.
• Epidemiological studies requiring individual-level exposure reconstruction.
• Method development and inter-laboratory comparison exercises under CNAS proficiency testing schemes.
• Teaching and training in environmental engineering, industrial hygiene, and analytical chemistry curricula.

FAQ

Is the DDY-1.5D certified for use in ATEX or IECEx hazardous areas?

No. The instrument is explicitly designated as non-explosion-proof and must not be operated in Zone 0, 1, or 2 classified locations.
Can it be used for PM_2.5 or PM₁₀ mass concentration measurement?

Not directly. When equipped with the optional impactor preseparator and gravimetric filter cassette, it supports respirable dust sampling per ISO 7708—but requires offline gravimetric or elemental analysis.
What calibration frequency is recommended?

Pre-sampling calibration using a primary-standard dry-calibration syringe or electronic flow calibrator is required before each sampling campaign; annual verification against national metrology institute standards is advised.
Does it support remote data transmission or cloud logging?

No. The DDY-1.5D is a dedicated analog-electronic sampling platform with no telemetry interface; all data capture is manual and paper-based or entered into external LIMS systems post-analysis.
Is the pump compatible with high-humidity or condensing sample streams?

The diaphragm pump exhibits resistance to moisture ingress but is not rated for saturated vapor conditions; use of inline desiccant traps or chilled impingers is recommended for dew-point-sensitive applications.