How can a thermal shock chamber be integral for product testing

The Thermal Shock Chamber from LISUN is an efficient tool for subjecting products to thermal shock testing. A product carrier basket in Thermal Shock Environmental Chambers automatically moves a product under test between individually controlled temperature zones. Users may easily monitor the product as it is transported between temperature zones thanks to built-in viewing windows. Thermal Shock Chambers are available in a range of performance configurations to satisfy individual testing requirements and incorporate the user-friendly 8825 Controller.

Three test chamber configurations
• A Vertical Orientation Thermal Shock Chamber contains two independently regulated hot and cold zones that are stacked one on top of the other. A single product carrier moves between each zone, exposing the product to drastic temperature swings. The Vertical Orientation chamber has the advantage of taking up less floor area, making it perfect for smaller labs.
• Horizontal Orientation Thermal Shock Chambers have three distinct zones side by side: hot, ambient, and cold. The addition of the ambient zone enables three-zone testing, which some military requirements need.
• This one-of-a-kind and adaptable chamber structure can also be used for two-zone tests. This is performed by programming the product carrier to automatically transport the product from hot to cold and back, avoiding dwell time in the ambient zone.

A cool zone is located between two hot zones that are vertically aligned top and bottom in a Double Duty Thermal Shock Chamber. Products are placed in one of two product carriers and transported between the zones, resulting in extreme temperature stress.
The cold zone is always occupied by at least one product transporter.

This design makes efficient use of the chamber cooling system, allowing for faster product testing than typical thermal shock designs. Heaters in the cold zone are there to thaw it. This increases the utility of the chamber. When not used as a temperature cycling chamber, it can be used for thermal shock tests.

Temperature Shock Testing Capabilities
There are numerous automated air-to-air thermal shock chambers available. Most chambers have a temperature range of -70°C to +180°C and can switch between extremes in a matter of seconds. Smaller test objects can be accommodated in these chambers. Walk-in chambers can be used to assess large goods. There is liquid-to-liquid and air-to-liquid thermal shock testing. There is also the custom profiles at temperatures above a few hundred degrees Celsius and cryogenic temperatures. Please contact us to explore how we might help with your thermal shock testing requirements.

Temperature Shock Test Overview
Thermal shock testing, as defined by MIL-STD 810 Method 503, is used to verify whether equipment can sustain abrupt fluctuations in the temperature of the surrounding environment without suffering physical damage or performance degradation. The operation of temperature shock test items may be impaired momentarily or permanently because of exposure to rapid temperature changes.

Temperature shock testing goals
Temperature shock testing has two goals.
1) to determine if the test item can meet its performance requirements after being exposed to sudden temperature changes in the surrounding atmosphere; and
2) to determine if the thermal shock test item can be safely operated after being exposed to sudden temperature changes in the surrounding atmosphere.

Examples of difficulties that could arise because of sudden temperature changes include, but are not limited to:
• Glass, vials, and optical equipment shattering
• Moving parts binding or slackening
• Constituent separation
• Electronic component modifications
• Failures of electronic or mechanical components because of rapid water or frost build-up
• In explosives, solid pellets or grains are cracked.
• Dissimilar material differential contraction or expansion
• Component deformation or fracture
• Surface coating cracking
• Sealed compartment leakage
• Expert Thermal Shock Regulatory Compliance Testing

Thermal Shock Specifications
• EIA-364-32 IEC 60068-2-14 Thermal Shock and Temperature Cycling MIL-STD 202 Method 107 Temperature Testing Thermal

Shock Examination
• Method 1056 MIL-STD 750 Thermoelectric Shock (liquid to liquid)
• Shock MIL-STD 750 Method 1051
• Thermal Shock Test MIL-STD-883 Method 1011

What Is the Process of Thermal Shock Testing?
To achieve a rapid temperature change, the device under test (DUT) is placed inside a basket that automatically switches between hot and cold zones in seconds. These zones’ temperatures can be controlled using either an air-to-air or a liquid-to-liquid mechanism.
While air is more commonly used, adding liquid nitrogen (LN2) or carbon dioxide (CO2) into the test chamber to widen possible temperature ranges and boost temperature change rates is an alternative. This is sometimes referred to as a “liquid boost.” A LN2 boost may fast drop the temperature to -185°C (-300°F), whilst CO2 can nearly instantly lower the internal temperature of the chamber to -73°C (-100°F).

Because numerous temperature shock tested components are used in the aerospace and defense industries, there are a few common standards to ensure DUTs are carefully tested: MIL-STD 883K Method 1010.9, MIL-STD 202H Method 107, MIL-STD-202G, and MIL-STD-883G are all applicable.

Which Industries Perform Thermal Shock Testing?
Thermal shock testing is an excellent method for verifying the durability of electrical, electromechanical, plastic, and mechanical goods intended for use in the medical, consumer, aerospace, defense, or automotive industries. Consider the temperature swings that elements of an aero plane undergo when altitude changes, or the trauma imposed on a GPS gadget used by field researchers in wilderness terrain. It is frequently a matter of life and death for these gadgets to perform properly.

About Thermal Shock Chambers
Thermal testing could be done in various chambers. Consider two temperature chambers. You may condition one to reach the extreme heat level and the other to achieve the extreme cold level, then transfer the DUT between them if they are close to each other-for example, if they are stackable models.

There are, however, chambers developed expressly for thermal shock testing, which you should strongly consider. The military criteria described above are accurate. If you vary from the specs even for a minute, you must explain the discrepancy and how you adjusted for it. That is not an issue with a thermal shock testing chamber.

To retain high efficiency and temperature performance, the most current thermal shock chambers use heavy-gauge steel exteriors and stainless-steel interiors with a layer of highly efficient, low K-factor thermal insulation. These chambers are divided into two zones, one for cooling and the other for heating.

The cooling zone contains a standard cascade refrigeration system with quick recovery rates. Air cooling is less efficient but less expensive, whereas liquid cooling is more sophisticated, efficient, and expensive. The heating zone is entirely electric, utilizing low-watt-density resistance heaters with ceramic cores. This allows them to live longer lives with less downtime. Temperatures of up to 220°C (428°F) are supported by industry-leading chambers, with heaters functioning independently for very responsive temperature management.

If your testing requires an ambient phase, some models even provide a third zone between these two extremes. The DUT travels between the chambers in a pneumatically controlled basket with its own sensor, allowing engineers to monitor the product as well as the temperature in each zone. Temperature data is frequently recorded throughout testing in all three zones to ensure correct recovery times.

The chamber is divided into three sections: the pre-cooling zone, the pre-heating zone, and the test zone. The three zones are self-contained. The damper switches the three compartments without moving the test product. When the temperature is normal, the blower introduces the ambient temperature into the test space.

When the impact is low, the high temperature and normal temperature dampers are closed, the low temperature tank is connected with the test box, and the pre-stored cooling amount is instantaneously introduced into the test box. At high temperature, low temperature, and normal temperature, the high temperature and normal temperature dampers are closed. The damper is closed, and the high temperature tank interacts with the test box. This allows the pre-stored heat to be rapidly introduced into the test chamber. As a result, the goal of quick temperature change is met.

An air mixing room, a circulation air duct, a heating device, and a circulating fan are installed in the high temperature zone, and the high temperature gas is blown out of the air duct through the test area to recover the cycle; the air temperature adjusting room and the circulation are installed in the low temperature zone.

There are air ducts, heating and cooling systems, cold storage plates, and circulating fans installed. In the air ducts, air deflectors, dampers, and diffusers are fitted. The cold gas is blown out of the air duct and collected through the test area.

The temperature controller sends a command based on the following:

• Temperature of the high temperature zone.
• The temperature on the lower end of the temperature zone.
• The test temperature as measured by the temperature sensing body in the test chamber

The controller controls the heater output and the operation of the refrigeration unit via the calculus time and the SSR control module; the sample’s initial temperature can be set. The test requires the selection of a high or low temperature start, the test zone temperature, and high and low temperature impact conditions, as well as high and low temperature zones, to meet the goal of rapid temperature change and high and low temperature.

All of this adds up to a dependable and accurate process that assures the most important electronic-based goods encountered in modern life are safe and long-lasting not only for the aerospace and defense industries, but also for the public.

FAQs
How does a thermal chamber function?
Temperature chambers, also known as environmental test chambers, use forced air convection to conduct thermal experiments. In many aspects, they function similarly to an oven. Their primary requirement is air flow, which is provided by a fan and motor that cycles air through the test chamber.

How does a thermal chamber function?
Temperature chambers, also known as environmental test chambers, use forced air convection to conduct thermal experiments. In many aspects, they function similarly to an oven. Their primary requirement is air flow, which is provided by a fan and motor that cycles air through the test chamber.

What does thermal shock serve?
Reducing the heat gradient visible by the object by gradually changing its temperature or improving the thermal conductivity of the material. Lowering the coefficient of thermal expansion of the material increasing its power.

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