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

Overview

The Junray ZR-3620B Portable Low-Flow Air Sampling Pump is a precision-engineered instrument designed for quantitative collection of gaseous pollutants from ambient air in compliance with Chinese environmental monitoring standards. It operates on the principle of controlled volumetric aspiration: an integrated brush-type diaphragm pump draws air through a sampling medium (e.g., sorbent tube, filter membrane, or impinger), while real-time electronic flow regulation ensures consistent delivery across variable backpressures. Its low-flow architecture (0.2–1.5 L/min) is optimized for time-integrated sampling of volatile organic compounds (VOCs), aldehydes, ozone precursors, and other trace-level airborne contaminants—making it suitable for both short-term occupational exposure assessments and extended ambient air quality monitoring campaigns. The device meets the metrological and functional requirements specified in HJ/T 375–2007 (“Technical Requirements and Test Methods for Ambient Air Samplers”) and JJG 956–2013 (“Verification Regulation for Atmospheric Samplers”), supporting traceable, auditable data acquisition in regulatory and research-grade applications.

Key Features

• High-load-capacity brush-type diaphragm pump capable of sustaining stable flow against backpressures exceeding 40 kPa—critical for sampling through high-resistance media such as multi-bed sorbent tubes or PTFE membrane filters.
• Digital closed-loop flow control system incorporating a high-accuracy embedded thermal mass flow sensor and proprietary adaptive algorithm, delivering ±2.5% flow stability and measurement accuracy across the full operational range.
• Integrated environmental parameter sensing: automatic measurement and logging of ambient temperature, atmospheric pressure, pre-meter pressure, and pre-meter temperature—enabling real-time calculation of standardized reference volume (e.g., 25°C, 101.325 kPa) per ISO 5725 and US EPA Method TO-17 guidelines.
• Three programmable sampling modes: immediate start, user-defined timed intervals (up to 99 hours), and volume-triggered termination—supporting flexible deployment in field surveys, workplace hygiene audits, and indoor air quality (IAQ) studies.
• Ergonomic handheld design with compact footprint (≤200 × 120 × 80 mm) and lightweight construction (<0.9 kg), featuring a high-contrast LCD display with backlight for low-light conditions and intuitive menu navigation.
• Robust power management: rechargeable lithium-ion battery provides >10 hours of continuous operation at 1.0 L/min under 15 kPa system resistance—validated per IEC 62133 for safety and cycle longevity.

Sample Compatibility & Compliance

The ZR-3620B supports broad sampling medium compatibility, including but not limited to: glass or stainless-steel sorbent tubes (e.g., Tenax TA, Carbopack™ series), quartz or PTFE filter membranes (for PM-bound species), aqueous absorption solutions (e.g., DNPH-coated impingers for carbonyls), and diffusion scrubbers. All configurations maintain flow integrity without recalibration. The instrument complies with national standard HJ/T 375–2007 for performance verification—including linearity, flow stability, timer accuracy, and environmental compensation—and satisfies metrological traceability requirements outlined in JJG 956–2013. While not certified to ISO/IEC 17025, its design facilitates integration into GLP-compliant workflows when paired with validated sampling protocols and calibrated reference standards.

Software & Data Management

Data are stored internally in non-volatile memory with timestamped records of flow rate, accumulated volume, environmental parameters, and operational status. The device exports CSV-formatted logs via USB interface for post-processing in Excel, R, or dedicated environmental data platforms (e.g., EQuIS, ArcGIS Pro). No proprietary software is required; raw files include metadata headers compatible with EPA’s AirData and WHO AirQ+ frameworks. Audit trails—including operator ID input, calibration date stamp, and firmware version—are retained for QA/QC review. Firmware updates are performed offline using signed binary packages to ensure integrity and prevent unauthorized modification—aligning with principles of FDA 21 CFR Part 11 for electronic record retention where applicable.

Applications

• Ambient air monitoring networks for VOC speciation and ozone precursor tracking (per China’s “Blue Sky Defense Campaign” protocols).
• Workplace exposure assessment in chemical manufacturing, painting, printing, and semiconductor fabrication facilities—aligned with GBZ 159 and OSHA Method 0016.
• Indoor air quality investigations in schools, hospitals, and residential buildings targeting formaldehyde, benzene, and TVOCs.
• Research-grade sampling for atmospheric chemistry modeling, including isotope-labeled tracer studies requiring precise volumetric control.
• Field validation of fixed-site continuous emission monitors (CEMs) and low-cost sensor arrays via collocated grab sampling.

FAQ

What sampling media are compatible with the ZR-3620B?
The pump accommodates standard 6-mm and 1/4-inch OD sorbent tubes, 37-mm and 47-mm filter cassettes, and impinger systems with inlet adapters. No mechanical modification is required.
Does the ZR-3620B support external flow calibration verification?
Yes—it features a dedicated calibration port compliant with HJ/T 375–2007 procedures, enabling direct comparison against primary standards such as bubble meters or critical orifice calibrators.
Can the instrument operate unattended for extended periods?
With optional external power supply (12 V DC), it supports continuous operation beyond battery limits; internal logging retains up to 1,000 sampling events with full environmental metadata.
Is firmware update capability available in the field?
Firmware upgrades are supported via USB connection using manufacturer-provided binaries—no internet connectivity or cloud dependency is required.
How is flow accuracy maintained during temperature fluctuations?
The built-in thermal mass flow sensor compensates for temperature-induced viscosity changes in real time, and the pre-meter temperature reading enables dynamic correction of volumetric flow to reference conditions.