HUANKONG APK6100 Dynamic Gas Dilution System

Overview

The HUANKONG APK 6100 Dynamic Gas Dilution System is an engineered solution for precise, real-time generation of trace-level calibration gas standards under ambient pressure conditions. It operates on the principle of dynamic dilution—introducing a known concentration of analyte gas (e.g., SO₂, NO, CO) into a high-purity carrier stream via three independently controlled thermal mass flow controllers (MFCs). This architecture enables continuous, stable output of calibration mixtures with reproducible concentration accuracy across wide dilution ranges—up to 1500:1—without reliance on pre-filled cylinders or static blending techniques. Designed specifically for compliance with Chinese environmental monitoring standard HJ 57–2017 (Determination of Sulfur Dioxide in Exhaust Gas from Stationary Sources by Potentiometric Electrolysis), the APK 6100 supports both laboratory-based instrument calibration and field-deployable verification of continuous emission monitoring systems (CEMS), particularly in ultra-low emission scenarios where sub-ppm concentration accuracy is critical.

Key Features

• Triple-channel MFC architecture ensures independent, synchronized control of primary standard gas, secondary diluent, and auxiliary purge streams—enabling multi-step dilution protocols and enhanced uncertainty management.
• Atmospheric-pressure operation eliminates need for pressure regulation hardware, reducing system complexity and minimizing adsorption-related losses during low-concentration delivery.
• Integrated 7-inch capacitive touchscreen interface provides intuitive navigation, real-time flow visualization, and programmable dilution sequences—including ramped concentration profiles and timed step changes.
• Compact footprint (320 × 280 × 180 mm) and lightweight design (≤6.5 kg) facilitate transport between lab and stack testing sites without compromising structural rigidity or thermal stability.
• Output flow stability maintained at ±0.5% of setpoint across 20–50 mL/min range—optimized for compatibility with sorbent tube sampling, gas bag filling, and direct coupling to GC, CLD, UV-Vis, and electrochemical analyzers.
• Gas-phase mixing chamber engineered for turbulent flow regime, achieving >99.5% homogeneity within 1 second residence time—verified per ISO 6145-4 (Gas analysis — Preparation of calibration gas mixtures — Part 4: Dynamic volumetric methods).

Sample Compatibility & Compliance

The APK 6100 is validated for use with common calibration gases including sulfur dioxide (SO₂), nitrogen oxides (NO/NO₂), carbon monoxide (CO), ammonia (NH₃), and volatile organic compounds (VOCs) compatible with stainless-steel wetted materials and fluoropolymer seals. All internal pathways are electropolished 316L SS or PFA-lined to minimize surface reactivity and memory effects. The system conforms to HJ 57–2017 requirements for dilution accuracy, response time, and repeatability in fixed-source emission testing. While not certified to ISO/IEC 17025 or EPA Protocol Gas Certification (PGC) standards out-of-the-box, its MFC traceability (NIST-traceable calibration certificates available upon request) and documented uncertainty budget support integration into GLP-compliant laboratories and QA/QC workflows aligned with ISO/IEC 17025 Clause 5.4.2 (Equipment Calibration).

Software & Data Management

Firmware v2.3 includes embedded logging of all MFC setpoints, actual flows, timestamps, and user-defined batch IDs—exportable via USB-C to CSV for audit trail reconstruction. Optional PC software (APK-DiluteControl™) enables remote configuration, automated calibration sequence scheduling, and export of raw data compliant with FDA 21 CFR Part 11 requirements—including electronic signatures, audit logs, and role-based access control (RBAC). Data integrity safeguards include cyclic redundancy check (CRC) validation on all stored records and write-protection for historical calibration logs.

Applications

• Preparation of multi-point calibration curves for CEMS analyzers operating in sub-ppm detection ranges.
• Field verification of analyzer linearity and zero/span drift during stack testing campaigns per HJ 75–2017 and HJ 76–2017.
• Generation of challenge gases for permeation tube validation and diffusion source characterization.
• On-demand synthesis of mixed standard gases for method development in ambient air monitoring networks.
• Supporting reference material production in national metrology institutes where gravimetric certification is impractical due to compound instability or toxicity.

FAQ

What dilution ratios can the APK 6100 achieve?
The standard configuration delivers up to 1500:1; custom firmware and extended-range MFCs enable ratios exceeding 5000:1 upon request.
Can the APK 6100 be used with reactive gases like NO₂ or Cl₂?
Yes—provided appropriate wetted material selection (e.g., PFA tubing, electropolished SS) and avoidance of moisture contamination; application-specific validation recommended.
Is the output flow sufficient for connection to commercial GC injectors?
With optional flow splitter accessories, the 20–50 mL/min output can be adapted to match typical split/splitless injector requirements (1–10 mL/min) while preserving concentration fidelity.
Does the system support automated calibration routines?
Yes—via APK-DiluteControl™ software, users may define multi-step dilution sequences with dwell times, flow ramps, and pass/fail criteria linked to external analyzer feedback.
How is measurement traceability maintained?
Each unit ships with individual MFC calibration reports traceable to NIST SRM 2197a (gas flow standards); annual recalibration services are available through authorized HUANKONG service centers.