TESTech TTech-GBT11785 Critical Radiant Flux Tester for Floor Coverings
| Brand | TESTech |
|---|---|
| Origin | Jiangsu, China |
| Manufacturer Type | Direct Manufacturer |
| Model | TTech-GBT11785 |
| Compliance | GB/T 11785–2005, ISO 9239-1, ISO 9239-2, ASTM E648, ASTM E970, NFPA 253 |
| Radiation Panel | 300 mm × 450 mm porous ceramic, inclined at 30° |
| Radiant Flux Range | 0–50 kW/m² (calibrated with imported heat flux meter) |
| Igniter | 19 × 0.7 mm stainless steel nozzles, positioned at 60° from centerline base |
| Standard Substrate | 1050 mm × 250 mm × 20 mm calcium silicate board (density 850 ± 100 kg/m³) |
| Optical System | Tungsten-halogen lamp (2900 ± 100 K), silicon photodiode detector, motorized shutter for 0%/100% transmittance calibration |
| Radiation Thermometry | High-stability K-type thermocouple (Ø3.2 mm, insulated, ungrounded junction), mounted 25 mm below ceiling plate and 100 mm behind smoke duct wall |
| Heat Flux Measurement | Certified blackbody-calibrated radiometer (480–530 °C, 250 mm detection aperture), measuring flux at 110–910 mm intervals along radiant axis |
| Control Interface | Embedded 10.2″ industrial touchscreen HMI, PLC-based logic, USB/RS232 ports, audible alarm & event logging |
| Power Supply | AC 220 V ±10%, 50/60 Hz, 20 A (max. 5 kW) |
| Dimensions (Tester) | 1400(W) × 500(D) × 2200(H) mm |
| Dimensions (Control Cabinet) | 600(W) × 750(D) × 1600(H) mm |
| Weight | 200 kg (tester), 350 kg (full system) |
| Exhaust Flow Rate | 30–85 L/min |
Overview
The TESTech TTech-GBT11785 Critical Radiant Flux Tester is a precision-engineered apparatus designed to determine the critical radiant flux (CRF) of floor coverings and attic insulation materials under controlled radiant heat exposure. Based on the fundamental principle of radiant heat transfer and flame spread dynamics, the instrument replicates standardized thermal radiation environments defined in ISO 9239-1, ISO 9239-2, ASTM E648, ASTM E970, NFPA 253, and GB/T 11785–2005. CRF—the minimum incident radiant flux (kW/m²) at which flame propagation sustains across the surface of a horizontally oriented specimen—is a primary fire performance parameter used globally for classification, regulatory compliance, and product development in building material safety engineering. The TTech-GBT11785 employs a calibrated porous ceramic radiant panel (300 mm × 450 mm, tilted at 30°) to generate a spatially uniform and spectrally stable thermal field, enabling reproducible quantification of ignition threshold and lateral flame travel behavior.
Key Features
- Stainless-steel structural frame ensures long-term corrosion resistance and dimensional stability in high-temperature test environments.
- Precisely engineered porous ceramic radiant panel with integrated thermal uniformity verification—validated across the full 110–910 mm measurement range at 110 mm increments.
- Imported high-accuracy heat flux meter (0–50 kW/m² range) with NIST-traceable calibration for direct radiant flux quantification.
- Dual-stage ignition system: 19 × 0.7 mm stainless steel propane nozzles positioned at 60° from the specimen’s longitudinal centerline, plus auxiliary micro-nozzle for reliable pilot ignition.
- Optical transmittance subsystem featuring a 2900 ± 100 K tungsten-halogen source and silicon photodiode detector, supported by motorized shutter for automated zero/full-scale calibration and real-time smoke obscuration curve generation.
- K-type armored thermocouple (Ø3.2 mm, insulated, ungrounded junction) mounted per ISO 9239-1 specifications—25 mm below chamber ceiling and 100 mm behind smoke duct interior wall—for accurate ambient and boundary-layer temperature monitoring.
- Integrated PLC-controlled architecture with 10.2″ industrial touchscreen HMI, event-triggered audible alarms, and timestamped fault logging compliant with GLP documentation requirements.
Sample Compatibility & Compliance
The TTech-GBT11785 accommodates standard floor covering specimens (1050 mm × 250 mm) and attic cellulose insulation samples mounted on a certified substrate: 20 ± 1 mm thick, 850 ± 100 kg/m³ density calcium silicate board (uncoated, non-combustible). All mechanical, thermal, and optical subsystems conform to the dimensional, metrological, and procedural constraints stipulated in GB/T 11785–2005 and its harmonized international equivalents. The system supports full audit readiness for ISO/IEC 17025-accredited laboratories, including traceable calibration records for heat flux meters, thermocouples, and optical detectors. Data acquisition complies with FDA 21 CFR Part 11 principles via secure user authentication, electronic signature support, and immutable audit trails when connected to external PCs via RS232 or USB.
Software & Data Management
The embedded control firmware enables fully automated test execution—from pre-heating and baseline stabilization to radiant flux ramping, flame front tracking, and CRF calculation per ISO 9239-1 Annex B algorithms. Real-time graphical display includes radiant flux profile, thermocouple response, optical density decay (OD vs. time), and flame spread distance. All raw sensor data (10 Hz sampling rate) and derived metrics are exportable in CSV and PDF formats. Optional PC-based software extends functionality with multi-test comparative analysis, statistical process control (SPC) charting, and report templates aligned with EN 13501-1, UL 1081, and ASTM reporting conventions. Audit logs record operator ID, test parameters, calibration timestamps, and system error codes—ensuring full traceability for GMP/GLP-regulated environments.
Applications
- Classification testing of commercial and residential floor coverings (carpet, vinyl, linoleum, rubber, laminates) per national and EU fire safety regulations.
- Performance evaluation of cellulose, fiberglass, and mineral wool attic insulation systems under radiant exposure conditions simulating roof assembly fire exposure.
- R&D validation of flame-retardant additives, intumescent coatings, and backing layer formulations targeting improved CRF values.
- Third-party certification testing for CE marking (EN 13501-1), UL listing, and CCC certification pathways.
- Fire modeling input generation—providing experimentally derived CRF, time-to-ignition, and flame spread rate data for CFD simulation boundary conditions.
FAQ
What standards does the TTech-GBT11785 fully support?
The system is configured and validated for GB/T 11785–2005, ISO 9239-1, ISO 9239-2, ASTM E648, ASTM E970, and NFPA 253—including all geometric, thermal, and procedural requirements.
Is the radiant panel calibration traceable to national standards?
Yes—heat flux measurements are performed using an imported radiometer calibrated against NIST-traceable blackbody sources, with full certificate documentation provided.
Can the system be integrated into a laboratory LIMS or enterprise QA database?
Via RS232 or USB, the controller exports structured CSV data and supports custom API integration for automated ingestion into LIMS, SAP QM, or LabWare platforms.
What maintenance is required for long-term measurement stability?
Annual recalibration of the heat flux meter and thermocouples is recommended; optical components require biannual cleaning and shutter alignment verification per ISO 9239-1 Section 7.3.
Does the system include exhaust management provisions?
Yes—it integrates a built-in blower with adjustable flow control (30–85 L/min) and compatible duct interface for connection to facility fume hoods or dedicated exhaust manifolds meeting NFPA 90A requirements.
