Junray ZR-D17BT Integrated Acidic Gas Sampling System for HCl, H₂SO₄, and HF in Stack Emissions

Overview

The Junray ZR-D17BT Integrated Acidic Gas Sampling System is an engineered solution for quantitative collection and stabilization of reactive acidic compounds—including hydrogen chloride (HCl), sulfuric acid mist (H₂SO₄), hydrogen fluoride (HF), and hydrogen bromide (HBr)—from fixed-stack emissions. Designed in accordance with U.S. EPA Method 26A and ISO 10873 principles—though certified for compliance with Chinese national standards—the system operates on the principle of isokinetic sampling combined with thermally controlled adsorption and impinger-based absorption. Its integrated probe assembly incorporates a calibrated S-type Pitot tube for real-time flue gas velocity measurement, a platinum resistance thermometer (Pt100) for stack temperature monitoring, and dual-zone heated sampling lines to prevent condensation and analyte loss during transit. Unlike conventional single-function samplers, the ZR-D17BT enables simultaneous acquisition of gaseous, aerosol, and vapor-phase acidic species under field-deployable conditions, supporting subsequent ion chromatographic (IC) or potentiometric analysis per standardized protocols.

Key Features

• Isokinetic sampling capability via integrated S-type Pitot tube and dynamic pressure compensation algorithm
• Dual independent heating zones: sampling tube (up to 180 °C) and filter holder (up to 150 °C), each with PID-controlled thermal regulation and real-time temperature feedback
• Titanium alloy outer sampling probe—lightweight (≤2.3 kg), corrosion-resistant to halogenated and sulfuric acid vapors at elevated temperatures
• PTFE-lined gas pathways throughout the entire sample train to minimize surface adsorption of polar acidic species
• Modular absorption bottle support rack accommodating standard 75 mL, 125 mL, and custom-sized impingers; compatible with serial or parallel configurations
• Integrated high-vacuum diaphragm pump (flow range: 5–60 L/min, max vacuum: –60 kPa) with built-in flow calibration and pressure compensation
• External ice bath enclosure (–5 °C to +5 °C) with quick-connect ports for vertical or horizontal duct deployment without reconfiguration
• Backflow prevention via inline check valve installed upstream of absorption bottles to protect analytical integrity

Sample Compatibility & Compliance

The ZR-D17BT is validated for use with quartz fiber filters (QFF), PTFE membrane filters (0.45 µm), and glass wool pre-filters for particulate-bound acid mists. For gaseous-phase capture, it supports alkaline absorbents including 0.1 M NaOH, 3 % H₂O₂/NaOH mixtures, and ammonium hydroxide solutions—selected per target analyte volatility and stability requirements. The system conforms to the following regulatory and methodological frameworks: HJ 688–2019 (HF, IC), HJ 544–2016 (H₂SO₄ mist, IC), HJ 548–2016 and HJ 549–2016 (HCl, AgNO₃ titration & IC), HJ 1040–2019 (HBr, IC), and HJ/T 67–2001 (fluoride, ISE). While not CE-marked or UL-listed, its construction adheres to IEC 61000-6-3 EMC immunity guidelines and meets mechanical safety expectations for Class II portable emission monitoring equipment under GB/T 13309–2021.

Software & Data Management

The embedded microcontroller features a 3.5-inch TFT-LCD interface with touch-responsive navigation, displaying real-time metrics: stack temperature (±0.5 °C), differential pressure (±1 Pa), volumetric flow rate (±2 %), and cumulative sampled volume (with auto-corrected to standard conditions: 273.15 K, 101.325 kPa). All operational parameters—including heating setpoints, pump duty cycle, and alarm thresholds—are configurable and stored with timestamped logs (up to 10,000 records). Data export is supported via USB 2.0 (CSV format) for traceability in GLP-compliant laboratories. Though not FDA 21 CFR Part 11 compliant out-of-the-box, audit trail functionality can be enabled via firmware update to support electronic signature-capable environments upon customer request.

Applications

This system serves environmental monitoring agencies conducting routine stack testing at coal-fired power plants, waste incinerators, chemical synthesis facilities, semiconductor etching lines, and metal pickling operations. It is routinely deployed in third-party verification audits per China’s “Blue Sky Defense Campaign” enforcement directives and supports research into acid gas speciation kinetics in flue gas desulfurization (FGD) bypass streams. Academic users apply it in atmospheric chemistry studies evaluating HCl/HF partitioning between particulate and gaseous phases under varying humidity and temperature gradients. Its robust thermal management also makes it suitable for sampling low-velocity (15 % v/v) exhaust streams where conventional samplers exhibit condensate-induced bias.

FAQ

Can the ZR-D17BT be used for ambient air sampling?

No—it is designed exclusively for hot, humid, high-velocity stack emissions and lacks the low-flow precision required for ambient monitoring.
Is calibration certificate included with shipment?

Yes, each unit ships with a factory-verified calibration report for temperature sensors and flowmeter, traceable to CNAS-accredited reference standards.
What maintenance intervals are recommended?

Heating elements and pump diaphragms require inspection every 200 operational hours; PTFE tubing should be replaced after 500 hours or visible discoloration.
Does the system support remote data transmission?

Not natively—but optional RS-485/Modbus RTU module integration is available for SCADA-compatible telemetry.
Are replacement parts such as titanium probes and absorption racks available separately?

Yes, all structural and consumable components are stocked and supplied with full dimensional and material certifications (ASTM B265 Grade 2 Ti).