Ailun AL-2022 Intelligent Dual-Channel Constant-Flow Air Sampler

Overview

The Ailun AL-2022 Intelligent Dual-Channel Constant-Flow Air Sampler is a precision-engineered environmental sampling instrument designed for quantitative collection of gaseous and vapor-phase pollutants—including SO₂, NO_x, NH₃, H₂S, Cl₂, and volatile organic compounds (VOCs)—from ambient air, indoor environments, and occupational workspaces. It operates on the principle of solution absorption sampling, where sampled air is drawn through absorbent solutions (e.g., KI for ozone, NaOH for SO₂, or acidic KMnO₄ for NO_x) at a rigorously maintained volumetric flow rate. The system employs a microprocessor-controlled closed-loop feedback mechanism that continuously monitors and dynamically compensates for real-time variations in inlet pressure, ambient temperature, and pump load—ensuring stable isokinetic flow across fluctuating field conditions. Its dual-channel architecture enables either parallel sampling for statistical validation or simultaneous acquisition of two distinct analytes using separate absorption trains—critical for regulatory compliance, method validation, and inter-laboratory comparison studies.

Key Features

• Dual independent sampling channels with fully decoupled flow control—each channel supports programmable start/stop timing, delay intervals, and cyclic sampling sequences (1–99 cycles).
• High-accuracy electronic mass flow sensing with 0.01 L/min resolution and ±2.5% full-scale accuracy; automatic thermal and pressure compensation per HJ/T 375–2007 Annex B.
• Imported corrosion-resistant diaphragm pump with integrated overcurrent protection, low-noise operation (<55 dB(A)), and service life exceeding 5,000 hours under continuous duty.
• Patented anti-backflow desiccant drying tube design prevents liquid back-suction into the pump head during abrupt flow termination or vacuum loss—eliminating risk of pump damage and sample contamination.
• Multi-stage particulate filtration: stainless-steel inlet mesh + hydrophobic PTFE membrane filter (pore size ≤0.5 µm) upstream of flow sensor and pump—retaining aerosols and moisture without affecting flow linearity.
• Real-time measurement of pre-sampler temperature and pressure; automatic conversion of raw volume to standard reference conditions (0 °C, 101.325 kPa) per ISO 10780 and US EPA Method TO-15 requirements.
• Intelligent power management: seamless transition between AC mains and internal lithium-ion battery (7.4 V / 10 Ah); auto-save/resume functionality preserves sampling state during power interruption.
• Adaptive LCD interface with auto-contrast adjustment for low-temperature operation (down to –20 °C); intuitive menu navigation via four-directional keypad and tactile confirmation buttons.
• Integrated heating module maintains absorption bottle temperature between 15–30 °C—preventing freezing of aqueous reagents in sub-zero field deployments.

Sample Compatibility & Compliance

The AL-2022 is validated for use with standard impinger-based absorption media including but not limited to: 10 mL molybdate buffer (for phosphate analysis), 50 mL neutral buffered potassium iodide (for ozone), and 10 mL sulfamic acid–sodium nitrite solution (for nitrogen dioxide). Its mechanical and metrological performance conforms to Chinese national standards HJ/T 375–2007 (“Technical Requirements and Test Methods for Ambient Air Samplers”) and JJG 956–2013 (“Verification Regulation for Atmospheric Samplers”). While not certified to ISO/IEC 17025 or EPA equivalency protocols out-of-the-box, its traceable flow calibration, audit-ready data logging, and GLP-aligned operational safeguards—including timestamped event logs, parameter change history, and non-volatile memory retention—support integration into ISO 17025-accredited laboratories and GMP-regulated environmental monitoring programs.

Software & Data Management

All sampling parameters—including start time, duration, flow setpoint, measured temperature/pressure, accumulated volume, and battery voltage—are stored in non-volatile memory with millisecond-level timestamping. Data export is supported via USB interface to standard CSV format compatible with Microsoft Excel, LabArchives, and LIMS platforms such as Thermo Fisher SampleManager and LabVantage. Firmware supports user-defined calibration curves and configurable alarm thresholds for low battery, high resistance, or out-of-range pressure deviation. Audit trail functionality records all operator-initiated configuration changes, ensuring alignment with FDA 21 CFR Part 11 principles for electronic records and signatures when deployed in regulated environments.

Applications

• Ambient air quality monitoring networks (AQMN) for compliance with GB 3095–2012 and EU Directive 2008/50/EC.
• Indoor air quality (IAQ) assessments in schools, hospitals, and office buildings per GB/T 18883–2002.
• Occupational exposure assessment in industrial hygiene surveys aligned with OSHA Method ID-121 and NIOSH Method 6004.
• Emergency response sampling during chemical spills or accidental releases requiring rapid, reproducible dual-analyte capture.
• Method development and validation studies for new absorbent chemistries or passive sampler cross-comparison.
• Educational laboratory instruction in environmental chemistry and analytical instrumentation courses.

FAQ

Does the AL-2022 support external flow calibration verification?
Yes—the instrument provides a dedicated calibration port compatible with primary-standard bubble meters and electronic calibrators (e.g., DryCal DC-Lite), allowing field recalibration traceable to NIST or CNAS-certified references.
Can it operate unattended for full 24-hour sampling cycles?
Yes—when powered by AC mains or fully charged battery, the unit sustains continuous operation for >15 hours; combined with programmable delay/start functions, it achieves true 24-hr unattended sampling with automatic shutdown and data retention.
Is the firmware upgradable in the field?
Yes—firmware updates are delivered via USB flash drive and installed through the onboard menu system without requiring disassembly or service technician intervention.
What maintenance is required between sampling campaigns?
Routine maintenance includes cleaning the inlet filter, inspecting the drying tube desiccant, verifying pump seal integrity, and performing quarterly flow verification using a certified calibrator—per manufacturer-recommended PM schedule.
Are replacement parts and consumables available globally?
Yes—Ailun General supplies OEM-certified spare pumps, filters, drying tubes, and absorption bottle adapters through authorized distributors in North America, Europe, and Southeast Asia; lead time for international shipment is typically 4–6 weeks.