Protective clothing heat conduction tester
Overview
1.1 Applicable for testing thermal protection performance of single-layer or multi-layer materials used in protective clothing exposed to convective and radiant heat hazards. Not suitable for non-flammable materials or those prone to melting/dripping at high temperatures.
1.2 Design principle:
a. Horizontal placement of flame-retardant samples under combined convective/radiant heat sources
b. Exposure time recorded when transmitted heat equals second-degree burn threshold
c. Direct contact simulation (0mm gap) vs spaced contact (6.5mm gap)
d. Thermal protection value (TPP) calculation: Intersection of heat flux-time curve with Stoll curve
e. Stoll curve: Standard curve relating burn time to energy exposure – values above curve indicate risk of second-degree burns
Compliance Standards
GB 8965.1-2009 Appendix A, GA 10-2014 Appendix A, NFPA 1971-2017, ISO 12749, GB/T 38302-2019
Product Advantages
1. Computerized control system with LabVIEW software integration
a. User-friendly interface with automated calculations
b. Real-time data acquisition (20 samples/sec) and Stoll curve intersection detection
c. Intelligent temperature compensation algorithm
2. Automated thermal shield system:
a. ≤0.5s response time for heat shield retraction
b. Water-cooled shielding mechanism
3. Precision ignition system:
a. High-voltage spark generator with safety interlock
b. 38mm diameter gas burner with adjustable air/fuel mixture
4. TPP automatic calculation:
a. Integration of exposure time and total heat flux
b. Digital display of calculated TPP value
Technical Specifications
| Specification | Details |
|---|---|
| 4.1 Heat sources | 4.1.1 Radiant: 9×T-150 quartz lamps (10–50 kW/cm² @ 127mm) 4.1.2 Convective: Twin gas burners (45° angle, 10–50 kW/cm² each) 4.1.3 Total heat flux: 83±2 kW/cm² |
| 4.2 Sensors | Copper calorimeter probe (Φ25mm) with ±0.1℃ resolution Stoll curve intersection detection system |
| 4.3 Data acquisition | 20 Hz sampling rate prior to 250℃ Automatic TPP calculation via software integration |
| 4.4 Safety features | High-voltage interlock system Water-cooled shield mechanism Emergency shutdown protocol |
| 4.5 Dimensions | Main chamber: 800×500×550mm Instrument footprint: 1200×800×1000mm |
| 4.6 Power requirements | AC 220V±10% 50Hz, 3kW maximum |
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