HengaoDe HAD-R1200D Automatic Touchscreen Fire Extinguishing Agent Freezing Point Tester per GB 17835

Overview

The HengaoDe HAD-R1200D Automatic Touchscreen Fire Extinguishing Agent Freezing Point Tester is a precision thermal analysis instrument engineered for the standardized determination of freezing points in aqueous fire suppression agents. It operates on the principle of controlled cooling and automated phase transition detection, compliant with the Chinese national standard GB 17835–2019 “Test Method for Freezing Point of Aqueous Fire Extinguishing Agents”, and additionally supports verification against GB 15238 and GB 27897 for broader fire safety material characterization. The system employs a dual-chamber vacuum Dewar bath for stable thermal isolation, enabling precise temperature ramping from –60 °C to ambient. A high-resolution Pt100 sensor integrated into the sample probe continuously monitors specimen temperature, while an ISP FLASH microcontroller coordinates real-time signal acquisition, stirring actuation, thermal equilibrium validation, and endpoint determination—minimizing operator intervention to only sample loading and initial setup.

Key Features

• True-color 7-inch capacitive touchscreen interface with intuitive icon-driven navigation and multilingual support (English default)
• Dual independent test positions for parallel sample analysis, improving throughput in QC laboratories
• Integrated stainless-steel heating element and high-efficiency compressor-based refrigeration system, delivering rapid thermal response and long-term stability
• Automated mechanical stirring mechanism synchronized with temperature control to ensure uniform heat transfer and prevent supercooling artifacts
• Microprocessor-controlled PID algorithm for ±1 °C temperature accuracy across the full operating range (–60 °C to +30 °C)
• Transparent Dewar bath design with optical access for visual confirmation of crystallization onset and ice morphology
• Embedded thermal printer for immediate hardcopy output of test reports including date/time stamp, sample ID, freezing point value, and pass/fail status relative to specification limits

Sample Compatibility & Compliance

The HAD-R1200D is validated for use with Class A and Class AB aqueous film-forming foams (AFFF), alcohol-resistant aqueous film-forming foams (AR-AFFF), and other water-based extinguishing media meeting GB 17835 requirements. It excludes non-aqueous or highly viscous gels where nucleation kinetics deviate significantly from standard freezing behavior. Instrument validation documentation includes traceable calibration certificates for temperature sensors and stirring torque verification. The device conforms to general laboratory safety standards IEC 61010-1 and electromagnetic compatibility directive EN 61326-1. While not certified under FDA 21 CFR Part 11, its audit trail functionality—including timestamped result storage and immutable print logs—supports GLP-compliant recordkeeping in third-party testing facilities and fire equipment manufacturing QA departments.

Software & Data Management

The embedded firmware implements deterministic state-machine logic for unambiguous freezing point identification: it detects the inflection point in the cooling curve corresponding to latent heat release during solid-phase nucleation, then confirms stabilization over three consecutive 30-second intervals before finalizing the result. All raw temperature vs. time data are stored internally with millisecond resolution. Export options include USB flash drive dump in CSV format for post-processing in Excel or statistical software (e.g., JMP, Minitab). No cloud connectivity or remote access features are included—data sovereignty and network security are preserved by design. Firmware updates are performed locally via encrypted firmware image files supplied by HengaoDe technical support, ensuring version control and regulatory traceability.

Applications

This instrument serves critical roles across fire protection product development, batch release testing, and regulatory compliance auditing. Typical use cases include: verifying freezing point specifications for cold-climate deployment of firefighting foams; monitoring formulation consistency during production scale-up; supporting ASTM E2842 and ISO 11357-3 comparative studies on thermal stability; and generating documented evidence for CCC (China Compulsory Certification) submissions. Its robust architecture and repeatable performance make it suitable for ISO/IEC 17025-accredited laboratories performing routine testing under accredited scopes covering fire suppressant physical property evaluation.

FAQ

What standards does the HAD-R1200D directly support?

It is designed and verified per GB 17835–2019, with auxiliary alignment to GB 15238 and GB 27897 for extended fire agent characterization.

Can the instrument be used for non-aqueous extinguishing agents?

No—its algorithm and thermal profile are optimized for water-based systems exhibiting sharp freezing transitions; hydrocarbon or silicone-based agents require differential scanning calorimetry (DSC) methods.

Is external calibration required annually?

Yes—users must perform annual verification using NIST-traceable reference materials (e.g., certified ice point cells and calibrated thermistors) per internal SOPs aligned with ISO/IEC 17025 Clause 6.5.

Does the system support LIMS integration?

Not natively—but exported CSV files contain structured fields (Sample_ID, DateTime, Result_°C, Pass_Fail, Operator_ID) compatible with common LIMS ingestion protocols via middleware scripting.

What maintenance is recommended for the refrigeration module?

Compressor oil level and condenser coil cleanliness should be inspected quarterly; annual service by authorized technicians is advised to maintain ±1 °C accuracy over the full –60 °C range.