Heating tubes, as important components for converting electrical energy into thermal energy, are widely used in multiple fields. To ensure its reliable quality, the heating tube manufacturer adheres to a series of strict testing standards. These standards cover all links from raw material entry to finished product exit, involving multiple aspects of testing such as material performance, product performance and safety performance.
In the raw material inspection stage, there are clear standards for the pipes used in manufacturing heating tubes, heating wires, insulating materials, etc. The material and wall thickness of the pipes must comply with relevant regulations. Pipes of different materials are suitable for different application scenarios. For instance, stainless steel pipes are often used in environments with high corrosion resistance requirements. Manufacturers need to test their chemical composition, mechanical properties and other indicators to ensure they meet the corresponding material standards. The material, diameter and other aspects of the heating wire also need to be accurately detected. Its resistance value should be stable and meet the design requirements, as the performance of the heating wire directly affects the heating efficiency and service life of the heating tube. The insulation performance of insulating materials is of vital importance. Manufacturers will test their insulation resistance, temperature resistance, etc. If the insulating materials are substandard, it may lead to dangerous situations such as leakage of electricity.
Product performance testing is a key part of heating tube testing. First comes the power detection. The actual power of the heating tube at the rated voltage and the nominal power must be within a certain error range. Excessive error may affect the normal operation of the equipment. The manufacturer will use professional instruments to measure the power in a simulated working environment. Secondly, there is the detection of the heating rate. Within the specified time, the heating tube should be able to reach the corresponding temperature. If the heating rate does not meet the standard, it will affect the heating efficiency. This detection is generally carried out in a specific sealed container, and the time required for the heating tube to rise from the initial temperature to the target temperature is recorded. In addition, there is life testing. By running continuously on for a long time, it is observed whether the heating tube can still maintain a normal working state after a certain period of time, such as whether there is power attenuation, surface damage, etc., to assess its service life.
Safety performance testing is of Paramount importance. Withstand voltage testing is a common item. Manufacturers will apply a voltage that is a certain multiple higher than the rated voltage to the heating tube for a certain period of time to check if it will be broken down. If breakdown occurs, it indicates that there is a problem with the insulation protection of the heating tube, which cannot ensure the safety of use. Leakage current detection is used to check whether there is any current leakage from the heating tube to the casing or other parts that should not be electrified when it is in operation, ensuring that users will not be electrocuted due to leakage during use. Grounding resistance detection is to ensure that the heating tube is well grounded. When a leakage fault occurs, the current can be conducted into the ground through the grounding wire to avoid the risk of electric shock to personnel. The grounding resistance must comply with the specified resistance value range.
In addition to the above-mentioned inspection items, the heating tube manufacturer will also conduct targeted inspections based on different application scenarios and customer demands. For example, for heating tubes applied in the field of food processing, it is necessary to test whether their surface coatings meet the food hygiene and safety standards. For heating tubes used in damp environments, the waterproof performance test should be strengthened. By strictly adhering to these testing standards, heating tube manufacturers can effectively control product quality and provide users with reliable and stable heating tube products.
