Steiner Horizental Tunnel Furnace Apparatus

TESTech Instrument (Suzhou) Technologies is one of the leading manufacturers and suppliers of steiner horizental tunnel furnace apparatus in China. Welcome to wholesale premium test equipment at competitive price from our factory. If you have any enquiry about quotation, please feel free to email us.

 

 

The TESTech Steiner horizontal tunnel furnace is designed and developed according to UL 910 and NFPA 262. It is also known as the CMP plenum burning test or Steiner tunnel test, which is the highest fire safety requirement for plenum cables under UL standards.

 

During the test, multiple specimens are installed on the horizontal tunnel tray and exposed to an 87.9 kW gas Bunsen burner with 300,000 BTU/hr heat input for 20 minutes. The passing criteria require that the flame does not extend beyond 5 feet from the front end of the burner flame, that the maximum peak optical density does not exceed 0.5, and that the maximum average optical density does not exceed 0.15.

 

CMP cables are typically installed in air-return plenum spaces used for ventilation ducts or air-handling systems, and are accepted in Canada and the United States. FEP/plenum materials meeting UL 910 generally offer better flame retardancy and lower smoke concentration than low-smoke halogen-free materials complying with IEC 60332-1 and IEC 60332-3.

 

 

• Combustion chamber is made of stainless steel and internally lined with refractory bricks for good thermal insulation. Internal dimensions are 305 mm x 451 mm with a length of 7.6 m.
• All internal tooling fixtures are made of stainless steel for rust and corrosion resistance.
• Double-layer quartz glass observation windows allow viewing of flame spread distance and display flame front position by indicator lamps.
• Chamber height is designed for convenient specimen installation, adjustment, and observation of burning behavior.
• The chamber cover is designed as an integrated structure and uses water-seal design according to the standard.
• The chamber cover is made of refractory and stainless steel materials and is equipped with lifting hooks.
• Specimen support tray is equipped with water-cooled circulating support structure for high-temperature fire testing.
• Dual-head burner is located 1320 mm from the air inlet.
• Stainless steel exhaust duct, attractive and corrosion resistant.

 

 

• 10 kV spark igniter with safety flameout device. The igniter is automatically positioned by a lever connected to the shutoff mechanism.
• Burner heat output is automatically controlled by the gas flow control system with 1% reading accuracy.
• Bipolar gas flow valve control system avoids explosion risks caused by gas leakage due to solenoid valve failure.
• Variable-frequency fan automatically controls airflow speed in the flue; fan power 3 kW, voltage 380 V.
• Taiwan-brand gas pressure gauge and pressure regulator precisely control gas pressure.
• Imported gas flow control valve precisely controls gas flow.

 

 

• Smoke density analysis using incandescent light system: color temperature 2900 +/- 100 K; current fluctuation +/- 0.5%; linear smoke density output with time compensation.
• Lens forms a 20 mm parallel light beam with d/f less than 0.04.
• Detector spectral response conforms to CIE; chromaticity standard function accuracy +/- 5%; output linearity within 3% of transmittance or 1% of absolute transmittance; 90% system response time not more than 3 s.
• K-type sheathed thermocouple, 0.5 mm diameter, with temperature accuracy 0.5 C.
• Pressure sensor range 0 to 100 Pa connected to a pressure sensor with accuracy +/- 2 Pa; 90% output response time within 1 s.
• Ambient pressure accuracy +/- 200 Pa.
• Minimum system recording time 3 s; system time recording accuracy 0.1 s.
• Automatic inspection of flame spread distance.
• Computer animation displays flame spread condition in real time without the need to stay near the combustion box.
• Computer displays smoke density generation curve in real time.
• Automatic calibration of smoke transmittance to reduce influence of soot deposited on optical lenses.

 

 

• Standard control cabinet with embedded 10.2 inch LCD screen.
• Labview dedicated laboratory software control system, stable and reliable.
• Control parameter setting and display; test status and fault display and query.
• USB data export, historical curve and data query, and printing functions.
• Can independently control the machine to complete tests.
• Sound alarm and alarm incident display functions.
• USB and RS232 serial ports allow external desktop or laptop operation.
• PLC control system with automatic ignition and ignition failure protection.
• PLC plus inverter automatically controls and displays exhaust flow.
• Automatic measurement and calculation of heat release rate, smoke production index, oxygen consumption, and CO2 generation.

 

 

According to UL 910, heat release data are optional rather than mandatory.

 

 

• High-precision patented sampling system ensures stable and clean gas sample entering the gas analyzer.
• Includes particle filter with three-stage filtration system, filtration accuracy 0.5 um.
• Cold trap with compressor cooling principle controls gas sample temperature at 0 to 5 C.
• Suction pump provides gas sampling power source.
• Drying cylinder processes oxygen and nitrogen dioxide analysis lines for moisture removal and impurity filtration.
• High-precision ball valve for opening and shutting gas paths.
• Flow controller.

 

 

• Imported-grade paramagnetic oxygen analyzer: O2 range 0 to 25%, linear deviation less than 0.5% of full scale, repeatability better than 50 ppm O2, response time T90 less than 3.5 s.
• Imported-grade infrared CO2 analyzer: CO2 range 0 to 10%, linear deviation less than or equal to 1% of full scale, repeatability less than or equal to 0.5% of full scale, response time T90 less than 2.5 s.
• Imported-grade infrared CO analyzer: CO range 0 to 1%, linear deviation less than or equal to 1% of full scale, repeatability less than or equal to 0.5% of full scale, response time T90 less than 2.5 s.
• Smoke density analysis with incandescent light system, color temperature 2900 +/- 100 K, current fluctuation +/- 1.5%, linear smoke density output with time compensation, and imported photocell module.
• One-touch 5-level transmittance calibration with imported filters and no manual filter replacement.
• Additional smoke density analysis with incandescent light source, color temperature 2900 +/- 100 K, current fluctuation +/- 0.5%, and time compensation.
• Lens forms a 20 mm parallel beam with d/f less than 0.04.
• Imported Japanese photodetector, CIE matching response, chromaticity standard function accuracy +/- 5%, and output linearity within 3% of transmittance or 1% of absolute transmittance.
• System 90% response time not more than 3 s.
• Imported Omega thermocouples: three 0.5 mm diameter K-type sheathed thermocouples with temperature accuracy 0.5 C.
• Imported pressure sensor range 0 to 100 Pa with accuracy +/- 2 Pa and response time within 1 s.
• Exhaust capacity 0 to 0.65 m3/s.
• Additional general-purpose 2 mm K-type sheathed thermocouples.
• Ambient pressure accuracy +/- 200 Pa.
• Minimum system recording time 3 s and time recording accuracy 0.1 s.

 

 

• Labview-based application software with friendly interface, easy operation, and strong data interaction capability for scientific analysis.
• Data acquisition frequency adjustable to 1 s, minimum 0.1 s.
• Can display instrument status, calibrate and store calibration results, collect test data, and calculate required parameters.
• All test data and calculated curves, including temperature, humidity, flow, pressure, transmittance, O2/CO2/CO concentration, mass, and heat flux, can be freely selected for display on the main interface or separate windows with zoom capability.
• Test report supports switching between full-size graphics and thumbnail views.
• O2, CO, and CO2 delay can be independently corrected online for deeper analysis of test results.
• System control and calibration use modular design, with powerful functions and simple operation.
• Monitoring data can be shown in real-time numeric and curve formats, including temperature, humidity, flow, pressure, transmittance, and gas concentrations.
• Real-time calculation, analysis, and display of heat release rate, smoke production index, oxygen consumption, CO2 generation, CO generation, mass loss, radiant heat, wind speed, and total heat release.
• One-touch 5-level optical calibration at 0%, 25%, 50%, 79%, and 100%, with automatic calibration report generation.
• Calibration history can be queried.
• The test report module provides preview, editing, and report generation functions.

 

 

• Water supply and drainage system.
• Power supply system and facilities.
• Gas and air supply.

 

 

Parameter	Value
Model	TTech-UL910
Tunnel Dimensions	305 mm x 451 mm x 7.6 m
Burner Heat Input	87.9 kW / 300,000 BTU/hr
Burn Duration	20 min
Flame Spread Acceptance	Flame shall not extend more than 5 ft beyond the burner flame front
Peak Optical Density	Maximum 0.5
Average Optical Density	Maximum 0.15
Fan Power	3 kW
Fan Voltage	380 V

 

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