DRK9007AG Intrinsically Safe Automotive Cabin Air Filter Efficiency Tester

Overview

The DRK9007AG Intrinsically Safe Automotive Cabin Air Filter Efficiency Tester is a purpose-built, certified hazardous-area instrument designed for quantitative evaluation of particulate filtration performance in automotive cabin air filters under ATEX/IECEx-compliant explosive atmospheres. Engineered to ASTM D2986 (Standard Practice for Testing High-Efficiency Particulate Air [HEPA] Filters), ISO 16890-1:2016 (Air filters for general ventilation – Part 1: Technical specifications), and SAE J1707 (Test Procedure for Automotive Cabin Air Filters), the system employs constant-flow gravimetric and particle-counting methodologies to determine dust holding capacity (DHC), initial pressure drop, final pressure drop, and fractional efficiency across standardized test aerosols (e.g., ASHRAE Fine Dust, ISO Coarse Test Dust A2, or KCl NaCl salt aerosol). Its intrinsic safety design (Ex ia IIC T4 Ga) enables safe operation in Zone 1/Zone 21 environments—such as filter production cleanrooms with solvent-based coating lines or R&D labs handling volatile organic compounds—without requiring explosion-proof enclosures or purge systems.

Key Features

• Intrinsically safe certification per IEC 60079-0, IEC 60079-11 (Ex ia IIC T4 Ga), fully compliant for use in gas Group IIC (hydrogen, acetylene) and dust Group IIIC environments
• Modular airflow path with precision-machined stainless-steel ductwork, calibrated mass flow controller (0–100 L/min, ±1% FS accuracy), and differential pressure transducers (0–2500 Pa, 0.1 Pa resolution)
• Integrated laser particle counter (0.3–10 µm, 0.1 fL sample volume, 98% counting efficiency at 0.3 µm) synchronized with gravimetric sampling via certified filter holders (47 mm or 100 mm diameter)
• Automated test sequence control: programmable test duration, stepwise loading cycles, real-time ΔP logging, and automatic termination upon reaching terminal pressure drop (e.g., 450 Pa)
• Explosion-proof touch HMI panel with non-incendive interface, isolated 24 VDC power input, and galvanically separated analog/digital I/O for integration into plant SCADA systems
• Robust mechanical architecture featuring vibration-damped optical bench, ESD-safe work surface, and IP65-rated enclosure housing all electronics and sensors

Sample Compatibility & Compliance

The DRK9007AG accommodates flat-panel, pleated, and activated carbon–impregnated cabin air filters up to 300 mm × 300 mm × 100 mm (L × W × H). Standard test configurations support both single-pass and recirculating modes per ISO 16890 Annex C. All wetted components contact only inert materials (316L SS, borosilicate glass, PTFE seals) to prevent catalytic degradation of test aerosols. The system meets GLP requirements for traceability: each test run generates a timestamped audit log with operator ID, calibration certificate IDs, environmental sensor readings (T, RH, barometric pressure), and raw sensor outputs. Full compliance with FDA 21 CFR Part 11 is enabled via optional electronic signature module and audit trail export (CSV/XML).

Software & Data Management

DRK-FilterTest v3.2 software (Windows 10/11, 64-bit) provides full test automation, data visualization, and regulatory reporting. It supports configurable test templates aligned with OEM specifications (e.g., VW TL 813 28, Ford WSS-M99P1111-A2). Real-time dashboards display pressure drop vs. time, cumulative mass loading curves, and MPPS (Most Penetrating Particle Size) efficiency spectra. All datasets are stored in encrypted SQLite databases with SHA-256 hash integrity verification. Export options include PDF test reports (with digital signature), Excel-compatible .xlsx files, and ASTM E1447-compliant ASCII logs for third-party statistical analysis. Software validation documentation (IQ/OQ/PQ protocols) is provided for GMP-regulated facilities.

Applications

• Validation of cabin air filter media performance under simulated urban driving conditions (ISO Coarse Test Dust A2 loading at 30 g/m³ concentration)
• Comparative testing of electrostatically charged vs. mechanical-only filtration media for sub-1 µm particulate capture
• Accelerated life-cycle assessment of activated carbon layers for VOC adsorption capacity retention
• Production line QA/QC release testing per OEM PPAP requirements (Level 3 submission packages)
• R&D screening of nanofiber-coated meltblown substrates for improved initial efficiency without excessive ΔP penalty
• Compliance verification for automotive suppliers subject to IATF 16949 clause 8.5.1.1 (Control of production and service provision)

FAQ

What intrinsic safety certifications does the DRK9007AG hold?
It carries full Ex ia IIC T4 Ga certification per IEC 60079-11, valid for Zone 1 (gas) and Zone 21 (combustible dust) environments.
Can the system perform both gravimetric and particle-counting efficiency tests simultaneously?
Yes—the dual-sensor architecture enables concurrent real-time mass loading measurement and size-resolved particle penetration analysis during the same test cycle.
Is calibration traceable to NIST or other national metrology institutes?
All flow, pressure, and particle sizing calibrations are performed using NIST-traceable reference standards; calibration certificates include uncertainty budgets per ISO/IEC 17025.
Does the software support multi-user role-based access control?
Yes—administrator, technician, and reviewer roles enforce separation of duties; electronic signatures comply with 21 CFR Part 11 §11.200(a)(2).
What maintenance intervals are recommended for long-term operational reliability?
Critical subsystems require quarterly verification: flow controller recalibration, particle counter zero-check, and filter holder leak testing per ISO 16890-3 Annex B.