Programmable dual door high and low temperature test chamber

1、 Overall performance technical requirements

1. Core requirements for temperature control

Temperature range: The conventional range needs to cover -60 ℃~+150 ℃ (a wide temperature range of -70 ℃~+180 ℃ can be customized according to requirements), and it meets the requirements of GB/T 10592-89 standard under no-load conditions, meeting the extreme temperature testing needs of products in different industries.

Temperature control accuracy: The temperature control accuracy under constant temperature condition is ≤± 0.1 ℃ (150 ℃ constant temperature condition), and the temperature fluctuation is ≤± 0.5 ℃, to avoid temperature deviation affecting the accuracy of test data and ensure the reproducibility of product test results.

Temperature uniformity: Within the core testing range of -40 ℃~85 ℃, the temperature uniformity inside the box is ≤± 1.0 ℃, with no local temperature difference dead corners, ensuring consistency in batch sample testing conditions and meeting the requirements of GB/T 5170.2-2017 standard.

Heating and cooling rate: Non linear heating rate of no load ≥ 3.0 ℃/min (heating time of 25 ℃ and 150 ℃ ≤ 42 minutes), cooling rate ≥ 2.0 ℃/min, rate can be freely adjusted through the program to meet different temperature change cycle testing requirements, suitable for various test scenarios such as rapid temperature change and slow aging.Programmable dual door high and low temperature test chamber

2. Requirements for Programmable Control Technology

Control Core: Equipped with a 32-bit ARM processor and 24 bit AD sampling, paired with a PLC programmable logic controller and high-definition touch screen, the control resolution reaches 0.01 ℃, achieving precise parameter control and automated operation, with convenient operation and fast response.

Program Editing: Supports multiple program settings, allowing for free editing of testing stages such as heating, cooling, constant temperature, and cycling. The minimum control time for a single segment is ≤ 0.1 hours, and up to 100 program segments can be stored. It supports program calling, modification, and backup, meeting the needs of complex temperature cycling testing (such as -55 ℃) ↔+ 125 ℃ cycle test), equipped with PID adaptive control algorithm, can dynamically adjust the heating/cooling output ratio to avoid temperature overshoot and oscillation. The high Duan configuration can achieve self-tuning function and automatically optimize parameters for different loads.

Data collection and output: With real-time data collection function, it can automatically record test parameters such as temperature and time, support curve display and data export (USB/upper computer software), and can generate PDF test reports to meet the needs of data traceability, archiving, and certification testing. Some Gao end models support remote intelligent monitoring, making it easy to control the entire test process.

3. Exclusive requirements for double door structure

Door opening method: Adopting a left and right double door design, the door body can be opened independently or synchronously, suitable for the collection and storage of large and batch samples, improving testing efficiency, avoiding large temperature fluctuations inside the box when single door collection and storage of samples, and ensuring testing continuity.

Sealing performance: The door body is equipped with a double-layer silicone rubber door seal and magnetic suction strip, with a sealing grade of ≥ IP54. It maintains good elasticity even in a low temperature environment of -60 ℃, ensuring that the temperature inside the box does not leak or lose, maintaining temperature stability. At the same time, it has a door lock device to ensure test safety.

Observation and Assistance: Each door is equipped with a tempered and heated glass observation window (with a light transmittance of ≥ 90%), built-in lighting, and can prevent frosting in low temperature environments, making it easy to observe the status of samples inside the box in real time without affecting the testing process; The door is equipped with anti scalding and anti freezing handles, designed ergonomically for easy and safe operation. Some models can be equipped with door interlocking devices, which automatically pause the test when the door is opened to avoid safety hazards.

2、 Technical requirements for structure and materials

1. Box structure

Shell material: Made of 1.0mm thick cold-rolled steel plate spray treated with anti-static coating on the surface, wear-resistant, impact resistant, corrosion-resistant, not easy to rust, suitable for complex environments such as industrial laboratories and workshops, with a smooth and beautiful appearance, easy to clean and maintain.

Inner liner material: SUS304 stainless steel is used, which is corrosion-resistant, easy to clean, and has no pollution source. It avoids chemical reactions between the sample and the inner liner, and is suitable for high-precision testing needs such as electronics and medical devices. The inner liner size can be customized (the conventional volume covers 150L~3000L, and supports non-standard customization of super large sizes above 2M ³), meeting the testing needs of different sizes and batches of samples.

Insulation layer: 80mm~150mm thick high-density polyurethane insulation layer is used, with a thermal conductivity coefficient of ≤ 0.023W/m · K. It has excellent insulation performance and can effectively reduce temperature loss inside the box, reduce energy consumption, and avoid condensation and overheating on the outer wall of the box, ensuring safe operation and extending the service life of the equipment.

Air duct design: Multiple wing centrifugal fans are used to drive the airflow, and a top horizontal or vertical diffusion air duct design is adopted to ensure uniform distribution of airflow inside the box, further improve temperature uniformity, avoid local temperature deviation, and reduce direct impact of airflow on the sample, protecting precision samples from damage.

2. Requirements for core components

Refrigeration system: Adopting a cascade compressor for refrigeration, combined with imported compressors and environmentally friendly refrigerants (high-temperature R404A, low-temperature R23), the refrigeration efficiency is high, the operation is stable, and the lowest temperature of di-70 ℃ can be achieved. It has automatic defrosting function to avoid frost affecting the operation of the refrigeration system in low-temperature environments. The compressor is equipped with delayed start protection to extend its service life. Some models adopt servo flow control technology, reducing energy consumption by about 45%, suitable for long-term continuous operation.

Heating system: using nickel chromium alloy electric heating tubes, uniform heating, high efficiency, high temperature resistance, corrosion resistance, long service life, equipped with PID adjustment function, can accurately control heating power, avoid temperature overshoot, and have overload protection function to prevent heating tube damage, ensuring stable operation of the equipment. The heating rate can be freely adjusted according to testing needs, up to 5 ℃/min.

Sensor: PT100 platinum resistance temperature sensor is used, which has high accuracy and fast response. It can collect real-time temperature data inside the box and transmit it to the control system for closed-loop control, ensuring the accuracy of temperature control. The sensor is installed in a reasonable position to avoid being affected by airflow and samples. Some models can be equipped with additional sensors to accurately monitor the surface temperature of the sample.

3、 Technical requirements for security protection

Overtemperature protection: Equipped with an independent overtemperature protector, when the temperature inside the box exceeds the set range (the protection threshold can be freely set), the heating/cooling power supply will be automatically cut off, triggering an audible and visual alarm to avoid sample damage and equipment failure. At the same time, it has an overtemperature alarm reset function, which can restore normal operation after troubleshooting. Some models support overtemperature pre alarm to avoid risks in advance.

Electrical protection: It has overcurrent, overload, phase loss, and reverse phase protection, and can automatically cut off power protection when the power supply voltage fluctuates (AC220V/380V ± 10%). The grounding resistance is less than 4 Ω to prevent electrical faults from causing safety accidents. At the same time, it protects the electrical components of the equipment from damage, extends the service life of the equipment, and meets the requirements of industrial electrical safety standards.

Other protections: equipped with compressor overload and fluorine deficiency protection to prevent compressor damage; Door interlock protection (optional), automatically pauses the test when opening the door to prevent injury from cold and hot air leakage; If equipped with a humidification module, it needs to have a water shortage protection function to avoid dry burning and damage to the humidification system; When the equipment runs abnormally, it can automatically shut down and display fault codes for quick troubleshooting, ensuring the safety of operators and equipment. It is strictly prohibited to test flammable, explosive, and highly corrosive substances inside the box (unless the equipment is a customized explosion-proof version).

4、 Environmental adaptability and installation requirements

Environmental adaptability: The equipment can operate stably under the conditions of ambient temperature of 0 ℃~35 ℃ and relative humidity ≤ 85% RH, without condensation or obstacles. It is suitable for conventional industrial environments such as laboratories and workshops, avoiding extreme environmental effects on equipment performance. At the same time, it has anti-interference ability and can work normally in ordinary industrial electromagnetic environments without affecting the accuracy of test data and the stability of equipment operation.

Installation requirements: The equipment should be placed horizontally, with a ground bearing capacity of ≥ 1.2 times the equipment's own weight, to avoid vibration affecting equipment operation; The distance between the equipment and the wall or ceiling should be ≥ 30cm to ensure good heat dissipation and avoid overheating of the cooling and heating systems; The power supply needs to be stable and grounded reliably to avoid voltage fluctuations affecting equipment performance. After installation, no-load debugging is required to ensure that temperature control, program operation, safety protection, and other functions are normal and meet technical requirements before being put into use. The installation process needs to be operated by professional technicians to ensure installation standards.

5、 Adaptation standards and additional requirements

1. Adapt to industry standards

The equipment performance needs to fully comply with the following industry standards to ensure that the test results have authority and universality, and can meet the needs of research and development, quality inspection, certification and other scenarios:

1. GB/T 10592-2008 "Technical Conditions for High and Low Temperature Test Chambers";

2. GB/T 2423-2012 "Environmental Testing for Electrical and Electronic Products" (equivalent to IEC60068-2:2007);

3. GJB 150A "Environmental Test Methods for Military yon Equipment";

4. IEC 60068-2 series "Environmental testing - Part 2: Test methods";

5. Relevant standards for automotive component testing (such as ISO 16750, GB/T 28046), new energy battery testing standards (such as GB/T 31484-2015), etc.

2. Additional functional requirements (optional)

Humidity function: Optional humidification module can be used to achieve 20%~98% RH humidity control (accuracy ± 3% RH), meeting the requirements of constant temperature and humidity, alternating humidity and heat testing, and adapting to product testing that requires humidity environment (such as electronic component humidity and heat aging testing). The humidification system adopts electrode or boiler type humidifiers, with water-saving function, ensuring clean waterway and low failure rate.

Remote control: Supports Ethernet remote control, allowing users to view device operation status, modify testing programs, and export testing data through computer or mobile app, facilitating unmanned testing and improving testing efficiency. It is suitable for batch and long-term continuous testing scenarios, and some models support program copy variable replacement function to reduce repetitive operations in multiple batches of testing.

Non standard customization: The inner container size, temperature range, heating and cooling rate, program storage capacity, and other parameters can be customized according to user needs to meet the personalized testing needs of large samples and special industries (such as aerospace and military). At the same time, special functions such as explosion-proof and anti-corrosion can be customized to meet the requirements of rigorous testing scenarios.

6、 Maintenance and Calibration Requirements

The equipment needs to have convenient maintainability, with core components (compressor, heating tube, sensor) that can be easily disassembled and replaced, reducing maintenance costs and downtime; The equipment needs to be calibrated regularly, with a calibration cycle of ≤ 12 months for temperature, humidity and other parameters. The calibration must comply with the requirements of JJF 1101-2019 "Calibration Specification for Temperature and Humidity Parameters of Environmental Testing Equipment" to ensure accurate and reliable test data. At the same time, the inner tank, condenser, air duct and other components need to be cleaned regularly to avoid dust and dirt accumulation affecting equipment performance and testing accuracy. Program files need to be backed up regularly to avoid data loss caused by system failures.

Programmable dual door high and low temperature test chamber