Double-Chamber Constant Temperature and Humidity Test Chamber Dual Cabin Temperature Humidity Environmental Test Cabinet

Item

Description

Basic Product Introduction

Name

Double-Chamber Constant Temperature and Humidity Test Chamber

Model

LR-2001-S

Quantity

1 Unit

Meet standards

1. GB11158 Technical specifications for high-temperature test chambers

2. GB10589-89 Technical specifications for low-temperature test chambers

3. GB10592-89 Technical specifications for high/low-temperature test chambers

4. GB/T10586-89 Technical specifications for damp-heat test chambers

5. GB/T2423.1-2008 Test methods for low-temperature test chambers

6. GB/T2423.2-2008 Test methods for high-temperature test chambers

7. GB/T2423.3-2006 Test methods for damp-heat test chambers

8. GB/T2423.4-2008 Test methods for cyclic damp heat

9. GB/T2423.22-2002 Test methods for temperature change

10. IEC60068-2-1:1990 Test methods for low-temperature test chambers

11. IEC60068-2-2:1974 Test methods for high-temperature test chambers

12. GJB150.3 High-temperature test

13. GJB150.4 Low-temperature test

14. GJB150.9 Damp-heat test

Description of Use

This test chamber simulates high-temperature, low-temperature, high-humidity, and low-humidity environments to assess changes in material properties and the degree of strength degradation in items such as rubber, plastics, and electronic products before and after testing. It can also simulate shipping container environments to evaluate fading and shrinkage in rubber and plastics under conditions of high heat and humidity. The chamber tests the heat, cold, dryness, and humidity resistance of various materials. It is suitable for quality control and testing in industries and institutions such as electronics, electrical appliances, batteries,
universities, research institutes, inspection and quarantine bureaus, paper products, food, automotive manufacturing, auto parts,metals, chemicals, and construction materials.

Features

Features a sleek, high-quality design; operates quietly; and offers simple, safe, and reliable operation.

Prohibited Actions for Laboratory Equipment

1. Testing or storage of flammable, explosive, or volatile substances

2. Testing or storage of corrosive substances

3. Testing or storage of biological samples

4. Testing or storage of samples that are strong sources of electromagnetic emissions

Performance indicators

Internal dimensions

(W × H × D) 400 mm × 500 mm × 400 mm × 2

External dimensions

(W × H × D) 900 × 1650 × 1450 mm

Internal volume

80 L × 2

Temperature range

-40°C to +150°C

Humidity range

20%–98% RH (adjustable)

Control stability

Temperature ≤ ±0.5°C; Humidity ≤ ±2%

Distribution uniformity

Temperature ≤ ±2°C; Humidity ≤ ±3.0%

Heating-up time

Average 3°C/min, non-linear no-load temperature rise

Cool-down time

Average cooling rate of 1°C/min (non-linear, no-load)

Temperature limit

Maximum temperature +150°C; minimum temperature -40°C

Housing structure

Overview of Chamber Structure

The unit consists of three integrated sections: the test chamber, the electrical control cabinet, and the machinery compartment.
The test chamber is located in the upper-left area and features an insulated interior liner with a left-opening door. 

Exterior Material

Baked-enamel steel exterior

Interior Material

SUS#304 stainless steel interior

Insulation Material

100mm rigid polyurethane foam or fiberglass insulation (flame-retardant and environmentally compliant)

Door

Hinged single-leaf door; equipped with an electric heating defrost system along the door frame and edges to prevent condensation or frost formation during low-temperature testing

Sealing

Double-layer silicone rubber seals on the door and frame; resistant to high/low temperatures and aging, ensuring excellent sealing performance

Observation Window

Large, triple-pane vacuum glass viewing window on the door; features a heating function to prevent condensation and frost,ensuring a clear view during any test

Lighting

Two explosion-proof, moisture-resistant LED lights (AC220V) installed at the viewing window

Access Port

Two 50mm diameter access ports, each with a soft plug and cover, for external power or signal cables (100mm ports available upon request)

Casters

Base equipped with four high-quality lockable swivel casters (for easy mobility) and adjustable leveling feet (to ensure unit stability)

Temperature and Humidity System

Heater

Adopt stainless steel fin-type heat dissipation tube-shaped heating tube imported from Taiwan

Humidifier

Split humidification cylinder design

Water filter

Filters out impurities from the water; easy to disassemble and clean

Water pump

Delta silent self-priming pump: low noise, stable performance, and built-in filter screen (for easy pump cleaning)

Water tank

One internal, removable water tank (easy to clean)

Low-water alarm system

Air Circulation System

Motor

"Yizheng" Synchronous Low-Noise Motor

Refrigeration system

Refrigeration system

Refrigeration methods include vapor-compression refrigeration, absorption refrigeration, steam-jet refrigeration, gas-expansion refrigeration, and thermoelectric refrigeration.

Among these methods, vapor-compression refrigeration is the most economical and widely used technique, and it is the standard method employed in environmental test equipment. Its operating principle relies on the latent heat of vaporization of a fluid—such as an environmentally friendly refrigerant—to absorb heat from the object being cooled. The (Single-Stage Refrigeration Cycle Diagram) illustrates this cycle. Liquid refrigerant passes through an expansion valve, undergoes throttling, and enters the evaporator, where it absorbs latent heat from the surroundings and evaporates. The resulting low-temperature, low-pressure gas is
drawn into the compressor. After compression, it becomes a high-temperature, high-pressure gas and enters a water-cooled or air-cooled condenser, where it cools into a high-pressure liquid before returning to the evaporator via the expansion valve. This continuous cycle absorbs heat at a low temperature to provide cooling and subsequently releases that heat at a higher temperature.
In the cycle shown in the diagram, a transition from one state to another is defined as a "process"; the refrigeration cycle consists of four such processes, which are briefly described below:

(1). Evaporation Process: Low-pressure wet vapor, having passed through the expansion valve, absorbs heat from the surrounding medium in the evaporator, thereby providing cooling while its dryness fraction increases. Consequently, the gas exiting the evaporator becomes either dry saturated vapor or slightly superheated vapor. During this process, the refrigerant's temperature
and pressure remain constant.

(2). Compression Process: After performing the cooling function, the vapor leaving the evaporator enters the compressor. Upon compression, its temperature and pressure rise sharply, transforming it into hot, highly superheated vapor. During the compression process, the refrigerant's entropy remains constant.

(3). Condensation Process: The high-temperature, high-pressure superheated vapor discharged from the compressor enters the condenser and exchanges heat with cooling water or air. This causes the superheated vapor to transition into saturated vapor and subsequently into saturated liquid. As cooling water removes heat, the temperature of the saturated liquid continues to drop,resulting in subcooling. The pressure remains constant during the condensation process.

(4) Throttling process: Liquid exiting the condenser passes through a throttling device—such as an expansion valve or capillary tube—and is throttled into a low-temperature, low-pressure wet vapor; the enthalpy of the refrigerant remains constant during this process.

Refrigeration system process

The low-temperature piping utilizes high-quality oxygen-free copper tubing. Fabrication involves the use of renowned "Rosenberger" electric pipe-bending machines, nitrogen-purged welding, and a rigorous 48-hour high-pressure leak-tightness test to ensure weld integrity.

Pipe Welding: Nitrogen-shielded welding is employed for the copper piping, ensuring a smooth, oxide-free interior. This prevents the formation of oxide impurities on the inner walls—a common issue with traditional welding methods—that could otherwise enter the refrigeration system and damage the compressor.

Vibration Damping: A combination of vibration-damping springs and anti-vibration soft rubber pads is installed beneath the compressor. Additionally, the refrigeration piping incorporates anti-vibration flexible hoses and C-shaped bends to prevent copper tube rupture caused by vibration or temperature fluctuations, which could lead to refrigerant leakage and compromise overall system performance.

Noise Control: Low-speed, high-airflow condenser fans are used to minimize noise levels.

Control system

Control Method

The Balanced Temperature and Humidity Control (BTHC) system utilizes PID control to regulate the Solid State Relay (SSR), ensuring that the system's heating and humidification output matches the heat and moisture losses, thereby enabling stable, long-term operation.

Controller Features

In-house R&D and design

Programmable controller

LCD/color display

Touchscreen interface with direct-action controls

Simultaneous programmable control of temperature and humidity

Bilingual display (Chinese/English)

Large 7-inch true-color screen

Large-format LCD controller featuring high contrast and adjustable backlight.

Controller Specifications

Accuracy: Temperature ±0.1°C, Humidity ±1% RH

Resolution: Temperature 0.1°C, Humidity 0.1% RH

Features high/low limit standby and alarm functions

Input signals: PT 100Ω × 2 (dry-bulb and wet-bulb)

9 sets of PID control parameters; automatic PID calculation

Automatic dry-bulb and wet-bulb calibration

Display Functions

Features an interactive touchscreen interface; no physical buttons required.

Directly displays temperature and humidity set values (SV) and actual values (PV).

Displays the current program number, step, remaining time, and cycle count.

Includes a cumulative operation time tracking function.

Displays temperature and humidity program settings as graphical curves, with real-time visualization of program execution.

Dedicated program editing screen; each page allows input for at least five steps of temperature, humidity, and time settings.

Switchable between Chinese and English interfaces.

Displays fault/error notifications.

Adjustable screen backlight.

Screen display protection settings include timer-based or manual shut-off options.

Program Capacity and Control Functions

Available program groups: Up to 120 patterns

Available memory capacity: Total of 1,200 segments

Command repetition: Up to 999 cycles per command

Interactive program creation with editing, clearing, and insertion functions

Segment time setting: 0 to 99 hours, 59 minutes

Power-loss memory retention; automatic restart and program resumption upon power restoration

Real-time graphical curve display during program execution

Scheduled start and shutdown functions

Date and time adjustment functions

Keypad and screen lock function

Protection device

Protection device

1. Zero-crossing thyristor power controller

2. Dry-heating protection switch

3. Compressor high-pressure protection switch

4. Compressor overload/overcurrent protection switch

5. Phase-loss protection switch

6. Non-fuse overload protector

7. Water tank low-water protection switch

8. Fast-acting fuse for heating and humidification circuits

Supplementary Installation Instructions

Operating voltage

220V ±10%, 50Hz

Power rating

8 kW

Permissible operating environment

0 ~ 30°C

Performance guarantee environment

5 ~ 25°C

Threaded cap

Ø50mm test port with threaded cap (on the left side of the unit) — 2 sets

Non-woven fabric

Standard non-woven test cloths — 3 pieces

Specifications

Provided upon ordering

Instruction manual

Equipment instruction manual — 1 copy