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Optimizing Environmental Testing: A Guide to LIB Humidity and Temperature Control Chambers

Aug 20 2025

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Introduction

Environmental testing chambers (TH Series) provide critical simulation capabilities for research, development, and quality assurance across industries. These systems offer precise control over temperature and humidity conditions, enabling professionals to evaluate product reliability and performance under various environmental stresses. Understanding their operation, calibration, and maintenance is essential for achieving consistent, accurate results.

This article provides you with a common FAQ about LIB humidity and temperature control chambers https://www.libtest.com/products/temperature-humidity-environmental-control-chamber.html , helping you better understand these test chambers.

1. Core System & Performance

1.1 Refrigeration System Design

The compressor starts operating at 85℃ instead of being activated at a higher temperature.

as a protective measure. This design prevents refrigerant overheating, which would trigger automatic safety shutdowns. The cooling cycle operates through a coordinated process:

Evaporation: Liquid refrigerant absorbs heat and transitions to low-pressure vapor within the evaporator.

Compression: The compressor draws in this vapor, compresses it into a high-pressure, high-temperature gas.

Condensation: The hot gas moves to the condenser, releasing heat to the surrounding medium and condensing back into a high-pressure liquid.

Expansion: The liquid passes through an expansion valve (capillary tube), reducing its pressure before returning to the evaporator to repeat the cycle.

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The standard model of LIB humidity and temperature control chambers has a minimum temperature of -120℃. Customization for lower temperatures is also available. In addition to mechanical refrigeration, LIB also offers water-cooled temperature and humidity control chambers.

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1.2 Sustained Performance for Long-Term Testing

These chambers reliably perform extended tests (e.g., dual 85°C/85% RH) due to two integrated systems:

Automatic Water Supply: Ensures a consistent and timely water source for maintaining high humidity levels.

Advanced PID Control: Intelligently allocates power between the refrigeration and humidification systems for optimal stability and efficiency.

2. Calibration & Accuracy Assurance

Precision is paramount. LIB calibration protocol ensures data integrity for both temperature and humidity readings.

Table: Calibration Overview

Parameter	Method	Standard Used	Goal
Temperature	9-Point Test, 6 Probes	DT-100 Probe	Controller display matches the average chamber temperature
Humidity	Psychrometric Comparison	Reference Hygrometer	Controller reading matches the standard reference table value

3. Key Components & Specifications

3.1 Heating System

Heating is achieved via dedicated heating wires installed in a layer behind the workroom workspace. Power capacity is scaled to the chamber's volume:

Table: Heating Element Specifications by Model

Chamber Model	Heating Wire Power
TH-50 / TH-80 / TH-100	1500 W
TH-225 / TH-500 / TH-800	2000 W
TH-1000 / TH-1500	3200 W

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3.2 Ports & Customization

Standard Connections: Water inlet/outlet valves feature an 11.5mm diameter and include 2 meters of drainage hose.

Test Ports: Located a standard distance from the insulation. A minimum spacing of 10cm is required between multiple ports.

Ramp Rates: A rapid change rate of 10°C per minute is standard within a typical operating range (e.g., -60°C to +85°C).

Custom Windows/Ports: Adding optical glass viewports or custom ports typically extends production time by 5-10 business days.

4. Maintenance & Support

4.1 Scheduled Maintenance

Refrigerant: Permanently sealed within the copper compressor loop with no routine depletion. Leak risk is minimal and primarily associated with weld integrity during transit, mitigated by specialized packaging.

Silicone Seals: Designed for longevity with a recommended replacement interval of 3 years to ensure ongoing integrity.

4.2 Installation

Guidance: We provide comprehensive video installation support to complement written manuals, ensuring correct setup.

Conclusion: Modern Humidity and Temperature Control Chambers are complex instruments integrating robust mechanical systems with precise digital control. Understanding their operation, calibration needs, and specifications is key to leveraging their full potential for effective environmental simulation.

References