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LBT-2501 Wire and Cable Heat Release Rate Test Apparatus

Name: LBT-2501 Wire and Cable Heat Release Rate Test Apparatus
Brand: Laibote (Tianjin) Testing Machinery
Availability: InStock

This standard specifies the test apparatus and test methods for evaluating the flame spread, heat release, and smoke production characteristics of vertically installed bundled wires, cables, or optical cables under specified test conditions. The tests enable determination of the 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.

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Switch and socket, wire and cable testing instruments

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E-mail:

lbt@lbt.ltd

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+86-15102211717

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LBT-2501 Wire and Cable Heat Release Rate Test Apparatus

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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FAQs

Do you supply full-set testing instruments for asphalt and geotechnical engineering projects?

We offer complete lab solutions including asphalt viscosity tester, asphalt rutting tester, geotextile permeability tester, low-temperature flexibility tester and concrete/cement test equipment, covering raw material detection for road, water conservancy and construction engineering projects

Can you customize fixtures or test machines based on our special test requirements? How about after-sales service and warranty?

We provide non-standard customization of test equipment and customized fixture clamps according to customers’ specimen size and test standards. All our testing machines enjoy 12-month factory warranty; overseas customers get remote online debugging guidance, spare parts supply and technical operation training. Our products have been exported to over 70 countries globally

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It measures heat deflection temperature and Vicat softening temperature of plastics, hard rubber, nylon, insulating materials and fiber-reinforced thermosetting composites. Intelligent temperature control guarantees precise heating rate, ideal for plastic raw material incoming inspection and formula development in plastic factories.

Does your pipe pressure burst testing machine control test temperature automatically? What’s its main application?

Yes, the constant-temperature circulating system keeps stable test environment during long-time hydrostatic resistance and instant burst pressure measurement of thermoplastic pipes. It complies with GB6111 standard and serves raw material inspection, new product R&D for plastic pipe manufacturers, third-party testing labs and university laboratories.

What kinds of pipes fit your ring stiffness tester? Can it do long-term creep testing?

This equipment is designed for HDPE, PVC corrugated pipes, plastic drainage pipes and various plastic tubular products. Apart from ring stiffness, ring flexibility and flattening tests, it supports continuous long-term creep tests up to 1000 hours (42 days) as required by industry specifications, widely used for pipe factories and construction quality inspection institutes.

What test items can your WDW series computer-controlled electronic universal testing machine complete? Which international standards can it meet?

Our WDW universal tester is applicable for tension, compression, bending, shearing and peeling tests of metal, plastic, rubber and composite materials. It supports test procedures in accordance with GB, ISO, ASTM, DIN, JIS multiple domestic and global standards. Equipped with high-precision servo drive and dedicated test software, it automatically collects, calculates and exports test data including tensile strength, elongation at break and elastic modulus.

Customer Reviews

Southeast Asia Rubber & Polymer Factory｜Purchase: Vicat Softening Point & Tensile Testing Machine

From Tanaka Hiroshi, R&D Supervisor, Indonesia rubber materials enterprise

2026.06.05

★★★★★

“Laibote’s Vicat softening point tester and electronic tensile machine have been applied to our raw material incoming inspection and new formula development for over one year. High testing accuracy effectively controls our product defect rate. What impresses us most is their responsive after-sale service; technical staff reply our troubleshooting requests within 24 hours even for time zone differences. Compared with expensive European brands, Laibote’s equipment balances quality and price excellently, we plan to expand procurement of auxiliary testing instruments next quarter.”

Middle East Construction Lab｜Purchase: Universal Electronic Testing Machine & Geotextile Test Equipment

From Mohamed Kareem, Lab Manager, UAE third-party construction inspection institute

2026.06.05

★★★★★

“We compared multiple testing equipment brands from Europe and China before cooperating with Laibote. Their WDW universal tester and full-set geotextile testing instruments meet local construction testing standards perfectly. Custom fixtures tailored per our specimen specifications save much testing time. Pre-sale technical communication was patient and professional; engineers provided online operation training after goods arrived. Stable machine performance greatly improves our laboratory’s detection efficiency, we are satisfied with cost performance and overall service.”

European Plastic Pipe Manufacturer｜Purchase: Ring Stiffness & Hydrostatic Burst Tester

From Thomas Bennett, Quality Director, UK plastic pipe factory

2026.06.05

★★★★★

“We have purchased two sets of pipe testing equipment from Laibote (Tianjin) for 18 months. The ring stiffness and hydrostatic burst testing machines run stably for daily batch inspection, test data matches ISO standard requirements precisely, and the intelligent test software is easy for our operators to master. Their after-sales team offers timely remote technical guidance whenever we have operational problems, spare parts supply is efficient. We have arranged a second bulk order for our new production workshop and will recommend Laibote’s testing machines to our industry partners across Europe.”

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