Test Vessels for Induction Hob Elements: An In-depth Exploration

Test Vessels for Induction Hob Elements: An In-depth Exploration Under IEC60335-2-9 and CISPR14-1

In the realm of induction hob element testing, test vessels play a crucial and indispensable role. These vessels, also known as standard cooking vessels and induction hob vessels, serve as a vital tool for simulating cooking appliances. Their significance lies in their ability to facilitate the normal operation test for induction hob elements, induction hotplates, and induction cooking

appliances, in accordance with specific standards such as IEC60335-2-6:2014 clause 3.1.9.101, IEC60335-2-9:2019 clause 3.1.9.105, and CISPR14-1:2016.

The Composition and Dimensions of Standard Cooking Vessels

Material Considerations

The construction material of these test vessels is of utmost importance. They are typically made of low carbon steel, with a maximum carbon content of 0.08%. This choice of material ensures certain properties that are conducive to accurate testing. However, it is worth noting that PEGO, a notable player in this field, takes it a step further. According to authoritative testing, the carbon content of the steel they utilize is ≤ 0.06%. This meticulous attention to material composition reflects their commitment to precision and quality in the testing process.

Dimensional Specifications

The standard cooking vessel commonly exhibits a circular shape, with specific diameter options such as φ110mm, φ145mm, φ180mm, φ220mm/φ210mm, and φ300mm. This circular design is a standard choice for most testing scenarios. Nevertheless, in cases where non-circular cooking zones need to be tested, non-circular vessels can be custom-made to meet the unique requirements of such situations.

The vessel itself is cylindrical in form, devoid of metallic handles or protrusions. This design simplicity ensures that there are no extraneous elements that could potentially interfere with the testing process. The diameter of the flat area of the base is carefully calibrated to be at least equal to the diameter of the cooking zone. This precise dimensioning is crucial for accurate heat transfer and simulation of real cooking conditions. Additionally, the maximum concavity of the base of the vessel is limited to 0.06d, and the base must not be convex. This ensures a uniform and stable contact surface with the induction hob element. To further enhance its functionality, the surface of the vessel is sprayed with a high temperature non-stick coating, which not only prevents food from sticking but also aids in maintaining a consistent heat distribution.

When it comes to testing induction hotplates and induction cooking appliances (as per IEC60335-2-9:2019 and CISPR14-1:2016), the base and wall thickness are specified to be 2mm±0.5mm. However, for the testing of induction hob elements (as per IEC60335-2-6:2014), while the wall thickness remains at 2mm±0.5mm, there are different requirements for the base thickness.

The Operational Procedure for Testing

The process of conducting tests using these test vessels requires a certain level of precision and attention to detail. First, a low carbon steel vessel containing cooking oil is carefully placed on the induction hob elements. It is essential that the diameter of the bottom of the vessel is approximately equal to the diameter of the cooking zone. Once in position, the vessel is centered precisely on the cooking zone.

Subsequently, the thermal controls are adjusted to their highest setting. This initial high heat application is necessary to rapidly raise the temperature of the oil. The goal is to reach a specific temperature range, namely 180℃±4℃. Once this temperature is achieved, the controls are then adjusted to maintain this temperature steadily. To ensure accurate temperature measurement, the oil temperature is measured 10mm above the center of the bottom of the vessel. This meticulous measurement process is vital for obtaining reliable and consistent test results.

The Advantages of Choosing PEGO

In the manufacturing of test vessels, different production processes can lead to significant differences in product quality and durability. In actual production, many manufacturers opt for a welding process to join the base and the wall of the vessels. While this method may offer certain advantages, such as saving materials and reducing production costs, it has its drawbacks. Over time, the welded joints may become weak and prone to leakage, especially after long-term use.

In contrast, PEGO adopts a one-piece molding technology to produce their vessels. This innovative approach ensures that the base and wall of the vessel are made from a single piece of material, eliminating any gaps or potential weak points. Although this method may incur higher production costs, it offers superior durability. The seamless construction of the vessel means that it is less likely to develop leaks or other issues, even after extended periods of use. This makes PEGO's test vessels a reliable choice for accurate and long-term testing applications.

Protecting the Standard Cooking Vessels: Best Practices

To ensure the longevity and effectiveness of standard cooking vessels, proper care and maintenance are essential. After each use, it is recommended to use a clean cloth to wipe the vessel clean. This simple yet crucial step helps to remove any residual oil or food particles that could potentially affect the performance or integrity of the vessel.

One must also avoid dry burning the vessel. Dry burning can cause significant damage to the coating of the vessel, which is designed to protect it from corrosion and ensure smooth heat transfer. Without the protective coating, the vessel becomes vulnerable to rust, which can further compromise its functionality and lifespan.

Furthermore, it is important to avoid any actions that could damage the appliance shape and coating, such as scratching or dropping the vessel. These types of damage can create weak points or expose the underlying material, increasing the risk of rust and other forms of deterioration.

Finally, the vessel should be stored in a dry and dust-free environment. Exposure to dust and moisture can accelerate the rusting process, reducing the vessel's effectiveness and lifespan. By following these best practices, users can ensure that their standard cooking vessels remain in optimal condition for accurate and reliable testing.

In conclusion, test vessels for induction hob elements under IEC60335-2-9 and CISPR14-1 are a critical component in the testing and evaluation of induction cooking appliances. Understanding their composition, proper operation, and maintenance is essential for obtaining accurate and reliable test results, and choosing a high-quality product like those offered by PEGO can significantly enhance the testing process and ensure long-term durability.