LBT-2501 Wire and Cable Heat Release Rate Test Apparatus
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Description
Product Introduction:
This standard specifies the test apparatus and test methods for evaluating the flame spread, heat release, and smoke production characteristics of vertically installed bundled electrical cables or optical cables under specified test conditions. The tests enable determination of the cable or optical cable’s heat release rate (HRR), total heat release (THR), smoke production rate (SPR), total smoke production (TSP), fire growth rate index (FIGRA), as well as the characteristics of burning droplets and particulates.
Implementation Standard
GB 31247-2014 “Classification of Fire Performance for Cables and Optical Fibers”
EN 50575:2014 “Fire performance requirements for power, control and communication cables during building construction”
GB/T 31248-2014 “Test Methods for Flame Spread, Heat Release, and Smoke Production of Cables and Optical Fibers Under Fire Conditions”;
EN 50399:2011 “General test for cables under fire conditions—Measurement of heat release and smoke production in flame propagation tests—Test apparatus, procedures, and results.”
GA/T 716-2007 “Test Methods for Flame Propagation, Heat Release, and Smoke Generation of Cables and Optical Fibers Under Fire Conditions”
Product Features
Our company not only designs in strict accordance with the GB/T 31248‑2014 standard and complies with the GB 31247‑2014 classification of flame‑retardant performance for wires and cables, but also adheres to the European Union’s EN 50399:2011 standard, thereby meeting the EN 50575‑2014 B requirements for CPR certification, which has been mandatory worldwide since 2017.
The system employs the instrument‑specific development software Visual Studio and a data acquisition control card. During testing, users can view experimental data curves in real time, and the system supports automated data acquisition and processing, as well as data storage and output of measurement results.
Status Check Interface: Provides a clear, at-a-glance overview of the operational status of all instrument sensors; records the measured values of each sensor, including the differential pressure sensor, flue gas temperature sensor, oxygen analyzer, carbon dioxide analyzer, and carbon monoxide analyzer. The report template is in Excel format and can display both graphical and numerical data.
Operating System: A robust backend computing database capable of collecting and processing data in real time, delivering truly user-friendly operation. It can continuously acquire and record technical parameters such as oxygen consumption during combustion, carbon dioxide production, smoke opacity in flue gases, heat release rate (HRR), total heat release (THR), fire growth rate index (FIGRA), and smoke production rate (SPR).
Calibration Mode: Allows setting the calibration mode for each sensor, including oxygen analyzers, carbon dioxide analyzers, carbon monoxide analyzers, differential pressure sensors, smoke density measurement systems, and mass flow controllers, with single-point or two-point calibration to achieve optimal linearity.
Calibration Procedure: Equipped with an independent routine calibration procedure. The procedure includes the following: drift in HRR, oxygen concentration, and transmittance during the 5 minutes prior to ignition; the average HRR value over the final 5 minutes of the combustion phase; initial values set as the respective averages of oxygen concentration, transmittance, and HRR during the first minute of the baseline calibration conducted before ignition; final values defined as the respective averages of oxygen concentration, transmittance, and HRR during the last minute of the calibration test; and the differences between the initial and final values for oxygen concentration, HRR, and transmittance.
Technical Specifications:
| Parameter Category | Parameter content |
| Test enclosure dimensions | Width × Depth × Height: 1000±100 (W) × 2000±100 (D) × 5400±100 (H) mm |
| Anemometer accuracy | 0.1m/s |
| Air-source wind speed parameters | Airflow measurement range: 8,000 L/min; outlet airflow rate: (5,000 ± 500) L/min, adjustable. |
| Test gas | 95% purity technical-grade propane (provided by the customer); liquefied petroleum gas may also be used. |
| Gas control flow operating condition | Under conditions of 100 kPa and 20°C |
| Smoke exhaust duct pressure sensor | High-precision pressure sensor, accuracy ±1 Pa |
| Smoke Density Measurement System | It can measure smoke density in real time during the test process. |
| Core Component Configuration | The gas analyzer and its key components are all original imported units. |
| Temperature measurement accuracy | 0.1℃ |
| Oxygen Measurement – Measurement Range | 0–25% |
| Oxygen Measurement – Signal Output | 4–20mA |
| Oxygen Measurement – Response Time | 10 seconds, with an error of ≤1 second. |
| Oxygen Measurement – Applicable Environments | Temperature: 0–45°C; Relative humidity: <90% (non-condensing) |
| Oxygen Measurement – Linearity | <±0.02% O₂ |
| Oxygen Measurement – Zero-Point Drift | 0.02% O₂/ week |
| Oxygen Measurement – Repeatability | <±0.02% O₂ |
| CO₂ Measurement – Measurement Range | 0–10% |
| CO₂ Measurement – Repeatability | <±0.5% |
| CO₂ Measurement – Drift Indicator | Zero-point drift ≤ 1% per week; span drift < 0.6% per week. |
| CO₂ Measurement – Linearity Deviation | <±0.5% |
| CO₂ Measurement – Response Time | 10 seconds, with an error of ≤1 second. |
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