HengaoDe H18164 Multi-Sensor Gas Flow Calibration System for H₂S Detectors and Mine Gas Sensors

Overview

The HengaoDe H18164 Multi-Sensor Gas Flow Calibration System is a precision-engineered benchtop instrument designed for traceable, repeatable calibration of electrochemical and catalytic bead gas sensors—particularly hydrogen sulfide (H₂S) detectors and mine-grade methane/oxygen/CO sensors used in underground mining, confined space entry, and industrial safety applications. It operates on the principle of dynamic flow dilution: certified standard gases are metered through a calibrated glass rotameter and delivered at stable, low-flow rates (60–600 mL/min) to sensor test ports under controlled environmental conditions. The system integrates a programmable DC power supply, high-resolution digital panel meters, and a modular manifold architecture to support simultaneous multi-sensor verification without cross-contamination. Its design complies with fundamental metrological requirements outlined in ISO/IEC 17025:2017 (clause 5.5.2 on calibration equipment) and supports traceability to NIST-traceable gas standards. Unlike single-point checkers, the H18164 enables full-range functional verification—including zero response, span accuracy, and response time assessment—across up to five sensors per cycle.

Key Features

• Simultaneous calibration of up to five gas sensors using independent flow paths and electrical biasing channels.
• Glass rotameter with Class 4 accuracy (per ISO 4021) and validated linear flow profile across 60–600 mL/min range.
• Dual-mode DC power supply (0–30 V / 0–2 A) with fine voltage/current control for sensor excitation and bias current simulation.
• Four-digit digital panel meter with 1 mA resolution and ±0.5% + 1 digit accuracy for real-time current monitoring during sensor response testing.
• Robust aluminum alloy chassis with vibration-damped feet; ESD-safe enclosure compliant with IEC 61326-1 for electromagnetic compatibility.
• Integrated environmental monitoring: ambient temperature and humidity sensors log conditions during each calibration session for audit trail compliance.

Sample Compatibility & Compliance

The H18164 accommodates standard 4–20 mA or 0–5 V analog output sensors with 2-wire, 3-wire, or 4-wire configurations. It supports common toxic and combustible gas transducers including electrochemical H₂S cells (e.g., Alphasense B4, Figaro TGS series), pellistor-based methane detectors, and IR-based CO sensors. All calibration procedures align with OSHA 1910.120 (HAZWOPER), MSHA Part 36 regulations for mine gas monitoring equipment, and ISO 12032:2019 (gas detector performance testing). The system’s rotameter is calibrated per ISO 4021 Annex A using gravimetric reference flows, and its electrical outputs meet IEC 61000-4-2 (ESD immunity) and IEC 61000-4-3 (radiated RF immunity) requirements. Documentation includes factory calibration certificates with uncertainty budgets (<±1.2% at 300 mL/min, k=2).

Software & Data Management

While the H18164 operates as a standalone hardware calibrator, it generates structured calibration records compatible with laboratory information management systems (LIMS). Each session logs date/time, ambient conditions, gas type/concentration, flow rate, sensor ID, pre- and post-calibration readings, operator ID, and pass/fail status per sensor channel. Data export is supported via USB-C interface in CSV format, enabling integration with GLP/GMP-compliant audit trails. The system meets FDA 21 CFR Part 11 requirements for electronic records when paired with user-defined password protection and operator authentication protocols. Optional PC software (HengaoCal v3.1) provides automated report generation, trend analysis of sensor drift over time, and calibration certificate printing conforming to ISO/IEC 17025 annexes.

Applications

• Periodic verification of fixed and portable gas detectors in petrochemical refineries, LNG terminals, and wastewater treatment plants.
• Pre-deployment calibration of multi-gas monitors used by fire departments and hazardous materials response teams.
• Quality assurance testing of OEM sensor modules prior to integration into safety instrumentation systems (SIS).
• Supporting ISO 9001 internal audits for gas detection program compliance in pharmaceutical cleanrooms and semiconductor fabs.
• Training laboratories for occupational health and safety certification programs (e.g., NEBOSH, IOSH).

FAQ

Does the H18164 support calibration of infrared (IR) gas sensors?
Yes—it delivers stable flow rates required for span gas challenge tests on NDIR-based CO₂, CH₄, and refrigerant sensors, though optical path alignment must be performed externally.

Can the rotameter be recalibrated in-house?
No—rotameter recalibration requires accredited flow lab facilities per ISO/IEC 17025; users must return units to HengaoDe service centers for traceable recalibration every 12 months.

Is the system compatible with humidified calibration gases?
It is not rated for saturated gas streams; relative humidity must remain below 85% to prevent condensation in flow lines and sensor chambers.

What documentation is provided with shipment?
Each unit ships with a Factory Calibration Certificate (traceable to CNAS-accredited labs), CE Declaration of Conformity, ISO 9001 Quality Manual excerpt, and multilingual operation manual (EN/ES/FR/DE).

How is sensor response time measured using this system?
By initiating gas flow while logging real-time analog output via external DAQ or multimeter; the H18164 provides stable gas delivery but does not include built-in timing circuitry.