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11 tips for choosing an environmental test chamber?

Views: 308     Author: Wendy     Publish Time: 2023-07-19      Origin: Site

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11 tips for choosing an environmental test chamber?

Choosing an environmental chamber might be difficult for individuals who are unfamiliar with them because there are so many different kinds of environmental chambers. Hongjin will demonstrate how to select an environmental chamber in this section.

Engineers who are researching the environmental effects of engineering goods have compiled both the natural and artificial environmental influences into a set of test standards and norms. These standards allow for the reliability and environmental testing of engineering goods. Therefore, we primarily rely on the test requirements and test standards of engineering products when choosing environmental test chambers.

Criteria for environmental chamber selection

1. Volume Choice

The working chamber volume of the climatic environment test chamber should be at least 3 to 5 times the exterior volume of the tested product when it is placed in an environmental chamber for testing.

2. Temperature Range Selection

Foreign temperature test chambers typically have a range of -73 to +177°C or -70 to 180°C. The majority of local manufacturers' goods can withstand temperatures as low as -80° to as high as 150°C. Most military and civil temperature testing in the nation can be conducted within these temperature limits.

3. Choosing the Humidity Range

Environmental test chambers both domestically and overseas typically have a temperature index of 2098% RH or 3098% RH. The temperature range is between 60 and 98% if the temperature and humidity chamber lacks a dehumidification mechanism. Only high humidity can be examined in this kind of test chamber, but it is significantly less expensive. It is important to remember that the minimum dew point temperature or related temperature range should be listed following the humidity indicator. because the relationship between temperature and relative humidity.

The greater the temperature, the lower the relative humidity is for the same absolute moisture level. For instance, the relative humidity is 20% RH when the temperature is 29°C and the absolute moisture content is 5 g/kg. Additionally, the relative humidity is 90% RH at 6 °C. Condensation will happen in the box when the temperature falls below 4 °C and the relative humidity rises above 100%.

4. Selection of Control Techniques

There are two conditions in the temperature and humidity test chambers:

Perpetual test chamber

Test chamber that rotates

Users should make decisions based on their genuine needs.

5. Choosing the Rate of Temperature Change

There is no index cooling rate in typical high and low temperature test chambers. And it typically takes 90 to 120 minutes from the cooling of the ambient temperature to reach the stipulated minimum temperature.

The requirements for variable temperature speed apply to both the high and low temperature alternating test chamber and the high and low temperature alternating damp heat test chamber. And the pace can be changed within the bounds of the variable temperature rate, which typically calls for 1 °C per minute. The temperature changes more quickly in the rapid temperature change test chamber. Additionally, in some temperature ranges, the rate of temperature change can be as high as 30 °C per minute.

6.Wind Speed.

When conducting environmental tests, the wind speed in the temperature and humidity chamber should be less than 1.7 m/s, per the applicable regulations. To speed up the flow rate of the circulating airflow in the tank, however, a quick temperature change test chamber and a multi-factor comprehensive environmental test chamber including factors like temperature, humidity, and vibration are needed. Usually, there is a 2–3 m/s wind.

7. Temperature Variability

Variations in temperature are quite simple to implement as parameters. All environmental test chamber manufacturers can regulate the actual temperature changes of the majority of their test chambers to within 0.3 °C.

8. Temperature Field Uniformity

In fact, there are numerous standards with precise requirements for temperature field homogeneity. For instance, IEC 68-2-3 states that the temperature tolerance is 2 °C, taking into account the measurement's absolute inaccuracy, the change in temperature that occurs slowly, and the temperature in the temperature cabinet. As a result, the temperature difference between any two spots in the test cabinet is always kept to a minimum.

9. Temperature Control With Precision

The relative humidity deviation should be between 2% and 3% RH. The dry and wet bulb method is used to measure the majority of the humidity in the environmental test chamber. The temperature variation is typically smaller than 0.2 °C in order to meet the standards of temperature control accuracy. The standards for humidity control accuracy are difficult to achieve in any other case.

10. Cooling Method Selection

In general, the environmental test chamber has two cooling options.

Air-cooled

variants with water cooling

The real conditions in the laboratory should be taken into consideration while choosing a cooling method.When conditions allow, water cooling takes precedence.

11. Additional Points to Take

In addition to some of the concepts and specific technical indications mentioned previously in this article, there are some other aspects that should be appreciated and taken into account when choosing a temperature humidity chamber.

Cost-effectiveness of performance

Cost-performance is a crucial element that needs to be taken into account after thoroughly examining the technical specifications and dependability of environmental test chambers.

How well it can and does meet user demands

According to the needs of the product test, the user purchases a temperature and humidity environmental test chamber, whose specifications change. For instance, some users conduct environmental stress screening tests and test product parts or components in a temperature humidity vibration combination test chamber. The user should be concerned right now with the forced dehumidification capability of the apparatus and the potential for an additional air drying system.

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