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ELH-251A and 468A Series Constant-Temperature and Constant-Humidity Test Chambers

It is a specialized device for conducting concrete testing and inspection under constant temperature and humidity conditions, suitable for a wide range of applications.

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Concrete Testing Equipment

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lbt@lbt.ltd

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+86-15102211717

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ELH-251A and 468A Series Constant-Temperature and Constant-Humidity Test Chambers

Description

Product Introduction

This specialized equipment is designed for concrete testing and evaluation in a wide range of applications, providing precise control of constant temperature and humidity. It meets the requirements for constant‑temperature, constant‑humidity testing as specified in GBJ 82‑85, “Long‑Term Durability Tests for Cement.” The unit features an LCD digital display, an intelligent integrated microcontroller that ensures fully automatic operation, and the ability to adjust test parameters according to various technical standards. In the event of incorrect parameter settings, a single button restores the system to its default configuration. Equipped with a factory‑installed, imported integrated temperature‑and‑humidity sensor and a dedicated external humidifier, it delivers uniform humidification with excellent performance. All major components adopt a plug‑in design, making maintenance and replacement exceptionally convenient. The cabinet’s insulation layer is made of integral polyurethane foam, offering superior thermal retention, tight sealing, and robust load‑bearing capacity, ensuring comprehensive performance. It is ideally suited for concrete carbonation testing and analysis across diverse settings.

Implementation Standard:

It meets the requirements for constant-temperature and constant-humidity testing equipment as specified in GBJ 82-85, “Long-Term Durability Tests for Cement.”

Features:

It features an LCD digital display and an intelligent integrated microcontroller that provides fully automatic control throughout the entire process.

Data can be adjusted to meet various technical standards, and in the event of an error during data modification, it can be restored to its original state with a single click.

Original imported integrated temperature and humidity sensor.

A dedicated external humidifier delivers even humidification.

All major components feature a plug‑in design, making maintenance and replacement exceptionally convenient.

The cabinet’s insulation layer is made of integral polyurethane foam, offering excellent thermal insulation, airtightness, and load-bearing capacity, with well‑rounded performance.

Technical Specifications:

Model number	ELH-251A	ELH-468A
Rated voltage	220V 50±1HZ
Total machine power	1.5KW	2KW
Heating power	800W	1.6KW
Refrigeration capacity	250W	250W
Humidification power	30W
Control the temperature	20℃±2
Temperature resolution	±0.1℃
Temperature uniformity	≤2℃
Temperature control range	(5~50)℃
Temperature accuracy	±0.2℃
Control humidity	(90±5)%
Humidity resolution	±0.1%
Humidity uniformity	≤2%
Humidity accuracy	2%
Humidity control range	(50-95)%
External dimensions	5506001800	12007001800
Working dimensions	4604401200	11105601270

Related Product

HC-40 Concrete Multi-functional Strength Tester

The HC-40 concrete multi-functional strength tester is a high-performance testing device integrating multiple advanced technologies, specifically designed for evaluating the strength and quality of concrete.

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

Which materials can be measured by your Vicat softening point tester?

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

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.”

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.”

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.”

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ELH-251A and 468A Series Constant-Temperature and Constant-Humidity Test Chambers

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