Junray ZR-3620A Portable Low-Flow Air Sampling Pump

Overview

The Junray ZR-3620A Portable Low-Flow Air Sampling Pump is an engineered solution for quantitative collection of gaseous pollutants from ambient air and emission ducts, specifically designed to support standardized sorbent tube-based sampling protocols. It operates on the principle of controlled volumetric aspiration—using a precision diaphragm pump coupled with real-time electronic flow regulation—to deliver stable, trace-level flow rates essential for volatile organic compound (VOC) and total volatile organic compound (TVOC) monitoring. The instrument complies with critical regulatory methodologies including HJ 644–2013 (determination of VOCs in ambient air via sorbent tube sampling, thermal desorption, and GC-MS), HJ/T 375–2007 (technical requirements for ambient air samplers), and JJG 956–2013 (verification regulation for atmospheric samplers). Its compact, handheld architecture enables field deployment across environmental monitoring stations, occupational health laboratories, indoor air quality (IAQ) assessment teams, academic research facilities, and industrial hygiene units requiring reliable, low-flow (<200 mL/min) sampling under variable backpressure conditions.

Key Features

• High-load diaphragm pump capable of sustaining ≥30 kPa backpressure—optimized for use with high-resistance sorbent media such as Tenax TA, Carbopack, or multi-bed tubes used in benzene homologues and TVOC analysis.
• Digital constant-flow control system featuring a built-in high-accuracy electronic mass flow sensor and proprietary closed-loop algorithm, ensuring ±2.5% flow stability and measurement repeatability across the full 10–200 mL/min range.
• Integrated environmental parameter compensation: automatic real-time measurement of ambient temperature, atmospheric pressure, pre-meter temperature, and pre-meter pressure—enabling accurate calculation and logging of reference-volume-adjusted sample volumes per ISO 5725 and EPA Method TO-17 conventions.
• Rechargeable high-capacity lithium-ion battery supporting >20 hours of continuous operation at maximum rated flow and maximum system resistance, validated under worst-case load conditions.
• Multi-mode sampling logic: immediate start, programmable timed sampling (up to 99 h 59 min), and volume-triggered termination (0.001–999.999 L), all configurable via intuitive menu navigation.
• Universal sorbent tube compatibility: supports standard 6 mm OD × 89 mm and 1/4″ OD × 3.5″ tubes with diverse packing materials (activated charcoal, silica gel, polymer-based adsorbents) and lengths—fully aligned with ASTM D5197, ISO 16017-1, and EN 14662.
• Ergonomic housing with high-brightness monochrome LCD display, tactile keypad interface, and IP54-rated ingress protection against dust and water splashes during field use.

Sample Compatibility & Compliance

The ZR-3620A is validated for use with solid-phase sorbent tubes, filter membranes (e.g., quartz fiber for PAHs), impingers containing absorbent solutions (e.g., DNPH for carbonyls), and diffusion scrubbers. It meets functional requirements outlined in HJ 644–2013, HJ/T 375–2007, and JJG 956–2013. While not certified to IEC 61000-6-2/6-4 or ATEX directives, its electrical design conforms to GB/T 18268.1–2010 (equivalent to IEC 61326-1) for electromagnetic compatibility in laboratory and field environments. Data integrity adheres to GLP-aligned practices, with timestamped event logs—including pump start/stop, flow deviation alerts, and battery status—for audit-ready documentation.

Software & Data Management

The device stores up to 200 complete sampling records locally, each containing start/end timestamps, accumulated volume, average flow rate, environmental parameters, and error flags. Data export is performed via USB-C interface using Junray’s proprietary PC software (compatible with Windows 10/11), which generates CSV- and PDF-formatted reports compliant with QA/QC documentation standards. The software supports batch calibration verification, flow deviation trend analysis, and automated reference-volume recalculation per ISO 10780 and US EPA 40 CFR Part 60 Appendix A-3 procedures. No cloud connectivity or remote firmware updates are implemented—ensuring data sovereignty and minimizing cybersecurity exposure in regulated environments.

Applications

• Ambient air monitoring of BTEX, aldehydes, and halogenated VOCs using thermal desorption–GC/MS workflows.
• Occupational exposure assessment in manufacturing, printing, coating, and chemical handling facilities per OSHA Method 1005 and NIOSH Method 1501.
• Indoor air quality surveys in residential, commercial, and educational buildings following ISO 16000-6 and GB/T 18883–2022 protocols.
• Method validation and field blank generation for accredited environmental testing laboratories operating under CNAS-CL01 (equivalent to ISO/IEC 17025).
• Research-grade sampling for kinetic studies of adsorption efficiency, breakthrough curve determination, and sorbent tube performance evaluation.

FAQ

What sorbent tube configurations are supported by the ZR-3620A?
Standard 6 mm OD × 89 mm and 1/4″ OD × 3.5″ stainless steel or glass tubes packed with Tenax TA, Carbopack B/C, activated carbon, silica gel, or mixed-bed sorbents.
Does the instrument provide real-time flow correction for changing ambient conditions?
Yes—integrated temperature and pressure sensors enable dynamic reference-volume calculation per ISO 10780 Annex B and EPA Method TO-17 Section 8.3.
Is the ZR-3620A suitable for use with impinger-based sampling methods?
Yes, when configured with appropriate flow restrictors and solution absorption vessels; maximum recommended flow is 200 mL/min for 10–25 mL impinger volumes.
Can the device store calibration history and user-defined method parameters?
Calibration constants are stored permanently in non-volatile memory; user-defined sampling methods (timings, target volumes, alarm thresholds) are saved per session but not retained across power cycles unless exported.
What maintenance intervals are recommended for long-term reliability?
Pump membrane replacement every 5,000 operating hours or biannually under typical field use; inlet filter cleaning after each sampling campaign; annual verification of flowmeter accuracy against NIST-traceable calibrators.