Double 85 high temperature and high humidity test chamber

The Haoen series double 85 high temperature and high humidity test chamber is used to test the performance of materials in various temperature and humidity environments, as well as to test the heat resistance, cold resistance, dry resistance, and moisture resistance of various materials.

　　Double 85 high temperature and high humidity test chamber

working principle

1Double 85 high temperature and high humidity test chamberIt consists of two parts: temperature regulation (heating, cooling) and humidification. By installing a rotating fan at the top of the box, air is discharged into the box to achieve gas circulation and balance the temperature and humidity inside the box. The data collected by the temperature and humidity sensors built into the box is transmitted to the temperature and humidity controller (micro information processor) for editing and processing, and temperature and humidity control instructions are issued. This is achieved through the joint operation of the air heating unit, condenser tube, and water tank heating and evaporation unit.

2. The temperature regulation of the high and low temperature wet heat cycle test chamber is achieved by installing a temperature sensor inside the chamber, collecting data, and adjusting it through a temperature controller (micro information processor). The air heating unit is connected to increase the temperature or adjust the refrigeration solenoid valve to lower the temperature inside the chamber, in order to achieve the required temperature control. The temperature regulation of the high and low temperature wet heat cycle test chamber is achieved by using a built-in temperature sensor to collect data, which is then controlled by a humidity controller (micro information processor). The heating element of the water tank is connected, and the humidity inside the chamber is increased by evaporating the water in the tank or adjusting the cooling electromagnetic valve to achieve dehumidification, in order to control the required humidity.

3. The high and low temperature wet heat cycle test chamber is equipped with multiple protective measures; The temperature system is equipped with an over temperature protector under the condition of being able to set the maximum safe allowable temperature. The air heating element can automatically power off when the rotating fan stops; The humidification system can stop supplying power as the water level in the humidification tank decreases; The refrigeration system also stops working as the temperature of the box rises (over 40 ℃) or the humidity increases.

Environmental conditions for the use of high and low temperature wet heat cycle test chamber

Temperature: 5 ℃~+35 ℃ (average temperature within 24 hours ≤ 28 ℃);

Relative humidity: ≤ 85% RH;

Air pressure: 86kPa~106kPa;

Power supply conditions: three-phase four wire+protective ground wire, voltage range: AC (380 ± 38) V;

Allowable frequency fluctuation range: (50 ± 0.5) Hz;

The grounding resistance of the protective grounding wire is less than 4 Ω;

Require users to configure corresponding capacity air or power switches for the equipment at the installation site, and this switch must be used independently for the equipment;

Water supply conditions: Purified water is required for equipment humidification.

Introduction

The Haoen series high and low temperature wet heat cycle test chamber is suitable for testing the quality of electronic, plastic products, electrical appliances, instruments, food, vehicles, metals, chemicals, building materials, aerospace, medical and other products. Specially test the heat resistance, cold resistance, dry resistance, and moisture resistance of various materials. This machine can choose Chinese or English LCD touch screen display, with simple operation, easy program editing, and user-friendly design. It can display complete system operation status related data, execution and program setting curves. If an abnormal situation occurs during operation, the screen will immediately sound an alarm, display the cause of the fault, and provide troubleshooting methods.

1、 Meet the standards

GB5170、2、3、5、6-95、GB 2423.1-89 (IEC68-2-1)、GB 2423.2-89 (IEC68-2-2)、GB/T 2423.3-93(IEC68-2-3)、GB/T423.4-93(IEC68-2-30)、GJB150.3(ML-STD0-810D)、GJB150.4(MIL-STD-810D)、GJB150.9-1986、GJB4.5-1983、GJB4.6-1983、GJB367.2-1987、GJB360.8-87、GB/T5170.2-96、GB/T5170.5-96、GB10592-93、GB10586-93 等

2、 Main technical indicators

2.1. Equipment model HE-WS-408C9

2.2. Inner box capacity 408 liters

2.3. Inner box dimensions: width 800 x height 850 x depth 600 (mm)

2.4. Dimensions: Width 1350 x Height 2000 x Depth 1150 (mm)

2.5. The total power is about 7KW

2.6. Use power supply AC three box five wire 380V 50/60HZ

2.7. 2 compartments

III performance

3.1. Test environmental conditions: The ambient temperature is+5~+28 ℃, the relative humidity is ≤ 85%, and there is no sample in the test chamber

3.2. Test Method GB/T 5170.2-2008 Temperature Test Equipment

GB/T 5170.5-2008 Damp Heat Test Equipment

3.3. Temperature range -40 ℃ to+150 ℃

3.4. Temperature control accuracy ± 0.2 ℃ (refers to the difference between the set value of the controller and the measured value of the controller)

3.5. Temperature fluctuation ≤ 0.5 ℃ (temperature fluctuation is half of the difference between the measured high and low temperatures at the center point)

3.6. Temperature error ≤± 1 ℃ (the average temperature displayed by the studio temperature controller minus the average temperature measured at the center point)

3.7. Temperature uniformity ≤ 2.0 ℃ (temperature uniformity is the arithmetic mean of the difference between the measured high and low temperatures in each test)

3.8. The average heating time is 3 ℃/min (non-linear, when unloaded)

3.9. Cooling time 0.75-1.2 ℃/min (non-linear, unloaded)

3.10. Humidity range 20% RH~98% RH

3.11. Temperature control accuracy ± 2.5% (refers to the difference between the set value of the controller and the measured value of the controller)

3.12. Relative humidity error ± 2.5% RH (only applicable to humid heat type)

Five principles to consider when selecting high and low temperature wet heat test chambers

With the rapid development of modern industrial technology, the application fields of electrical and electronic products are becoming increasingly broad, and the environmental conditions they experience are becoming increasingly complex and diverse. Only by reasonably defining the environmental conditions of the product and selecting the correct environmental protection measures can we ensure that the product is not damaged during storage and transportation, and is safe and reliable during use. Therefore, conducting artificial simulated environmental tests on electrical and electronic products is an important step in ensuring their high quality. Artificial simulation environmental testing is a scientific summary of actual environmental impacts, characterized by typicality, standardization, ease of use, and comparability. The diversification of environmental conditions and the importance of environmental testing have also put forward stricter requirements for environmental testing equipment.

The selection of high and low temperature humid heat test chamber environment and reliability testing equipment should follow the following five basic principles:

1. Reproducibility of environmental conditions

It is impossible to fully and accurately reproduce the environmental conditions that exist in nature in the laboratory. However, within a certain tolerance range, people can accurately and approximately simulate the external environmental conditions that engineering products undergo during use, storage, transportation, and other processes. This statement can be summarized in the language of engineering, which means that "the environmental conditions (including platform environment) created by the testing equipment around the tested product should meet the requirements of the environmental conditions and their tolerances specified in the product testing specifications. The temperature chamber used for Jun product testing should not only meet the high and low temperature test values and test times specified in the national Jun standards GJB150.3-86 and GJB150.4-86 for different types of products, but also meet the requirements for temperature field uniformity and temperature control accuracy in the test specifications. Only in this way can the reproducibility of environmental conditions be ensured in environmental testing.

2. Repeatability of environmental conditions

An environmental testing equipment may be used for multiple tests of the same type of product, and a tested engineering product may also be tested in different environmental testing equipment. In order to ensure the comparability of test results obtained for the same product under the same environmental testing conditions specified in the testing specifications, it is necessary to require the environmental conditions provided by the environmental testing equipment to be reproducible. This means that the stress levels (such as thermal stress, vibration stress, electrical stress, etc.) applied by environmental testing equipment to the tested product are consistent with the requirements of the same testing specification.

The repeatability of environmental conditions provided by environmental testing equipment is guaranteed by the national metrological verification department after passing the verification according to the verification regulations formulated by the national technical supervision agency. Therefore, it is necessary to require environmental testing equipment to meet the requirements of various technical indicators and accuracy indicators in the calibration regulations, and to not exceed the time limit specified in the calibration cycle in terms of usage time. If a very common electric vibration table is used, in addition to meeting technical indicators such as excitation force, frequency range, and load capacity, it must also meet the requirements of precision indicators such as lateral vibration ratio, table acceleration uniformity, harmonic distortion, etc. specified in the calibration regulations. Moreover, the service life after each calibration is two years, and after two years, it must be re calibrated and qualified before being put into use.

3. Measurability of environmental condition parameters

The environmental conditions provided by any environmental testing equipment must be observable and controllable. This is not only to limit the environmental parameters within a certain tolerance range and ensure the reproducibility and repeatability requirements of the test conditions, but also necessary for the safety of product testing, in order to prevent damage to the tested product and unnecessary losses caused by uncontrolled environmental conditions. At present, various experimental standards generally require that the accuracy of parameter testing should not be less than one-third of the allowable error under experimental conditions.

4. Exclusion of environmental testing conditions

Each environmental or reliability test conducted has strict regulations on the category, magnitude, and tolerance of environmental factors, and excludes the infiltration of non test required environmental factors, in order to provide accurate basis for judging and analyzing product failure and failure modes during or after the test. Therefore, it is required that environmental testing equipment not only provide the specified environmental conditions, but also not allow additional environmental stress interference to the tested product. As defined in the verification regulations for electric vibration tables, the table leakage magnetic flux, acceleration signal-to-noise ratio, and total root mean square value ratio of in band and out of band acceleration. The accuracy indicators such as random signal verification and harmonic distortion are all established as verification items to ensure the uniqueness of environmental testing conditions.

　　5.Safety and reliability of experimental equipment

Environmental testing, especially reliability testing, has a long testing cycle and sometimes targets high-value products. During the testing process, testing personnel often need to operate or test around the site. Therefore, it is required that environmental testing equipment must have the characteristics of safe operation, convenient operation, reliable use, and long service life to ensure the normal progress of the test itself. The various protection, alarm measures, and safety interlocking devices of the testing equipment should be complete and reliable to ensure the safety and reliability of the testing personnel, the tested products, and the testing equipment itself.

Daily knowledge of operators in high and low temperature alternating humidity test chambers

Knowing oneself and one's enemy is the key to victory in a hundred battles. As an operator of a high-low temperature alternating humidity test chamber, one should first understand the basic performance and operation methods of the chamber. Next, Aisili will briefly introduce the basic knowledge that operators of high-low temperature alternating humidity test chambers should understand:

One Understand the basic performance and structural data concepts, characteristics, testing scope, and acceptable limit range of the equipment;

During the operation of the equipment, operators should be familiar with the sample performance, test conditions, test procedures, and test techniques required for the test, in order to avoid operational errors that may cause the test equipment to malfunction and damage the test samples. Before using the equipment, operators should also carefully read the user manual of the test equipment.

II For different experiments, the required equipment also varies

III The required amount of additives in the high and low temperature alternating humidity test chamber should also be clearly understood and added according to the requirements of the test.

4 Develop a good habit of correctly placing test samples.

The operators of the high and low temperature alternating humidity test chamber should also understand the external manifestations of common equipment failures, in order to avoid equipment failures without knowing what to do.