Application of Dust Testing Chamber in Reliability Test of Various Products

Introduction

Outdoor equipment, industrial electrical appliances, transportation vehicles and lighting products are often exposed to wind, sand and dust. Invasion of dust into equipment will easily cause circuit short circuit, component wear, seal failure of outer shell and mechanical jamming, which greatly shorten the service life of products. A series of domestic and international standards for protection grade and environmental testing have been formulated to evaluate the dust resistance of products, and the dust testing chamber is the core equipment to implement standard tests and quantify product dustproof performance.

Also known as sand and dust test chamber, the dust testing chamber can create controllable dust climate conditions artificially to simulate natural dust accumulation and wind erosion. Long-term simulation tests are conducted on test samples, and the product compliance is judged according to the appearance, function and internal dust accumulation of samples after tests. LISUN SC-015 dust testing chamber is a widely used standardized equipment in the industry. It complies with GB, IEC and other authoritative standards, and can complete IP5X and IP6X dust protection tests for electrical and electronic products, lamps, electrical cabinets, auto parts and other products. It is widely applied in third-party testing laboratories, quality inspection departments and R&D laboratories, and has become an indispensable part of the modern product reliability test system. 

SC-015_Dustproof test chamber

Test Principle and Applicable Standards of Dust Testing Chamber

Basic Test Principle
The dust testing chamber adopts a sealed cabinet to form an independent test space. Dry talc powder is used as test dust. Combined with vibration device, air blowing system, heating device and vacuum system, dust can suspend and settle evenly inside the chamber to simulate the process of dust adhering to and penetrating products. According to different protection grade requirements, the equipment can adjust vacuum degree, test duration, vibration frequency and temperature. It detects whether dust can penetrate gaps, interfaces and vents of product shells, so as to judge whether the sealing structure and overall protection performance meet design requirements. After the test, inspectors evaluate the comprehensive performance of products in dust environment by checking the appearance integrity, internal dust accumulation and operating status after power-on.

Applicable Standards
LISUN SC-015 dust testing chamber conforms to mainstream domestic and international dust test standards, covering test requirements for various products, mainly including GB4208-2008, IEC60529 series standards, GB7000.1 for lamps, GB2423.37-89 dust test methods and GB/T 4942.2-93 protection grades for low-voltage equipment. In accordance with the above standards, the equipment can accurately carry out two core dust protection tests of IP5X and IP6X. IP5X allows a small amount of dust to enter, while the accumulated dust shall not affect normal operation of products. IP6X is fully dust-tight, which requires no dust deposition inside products after tests. The two items are mandatory test items for lamps, auto parts and industrial electrical cabinets.

Overall Structure and Technical Parameters of LISUN SC-015 Dust Testing Chamber

Overall Structural Design
LISUN SC-015 dust testing chamber adopts split functional structure with excellent durability, operability and test stability. The outer shell is made of high-quality steel with baking finish treatment, featuring rust resistance and corrosion resistance. The inner chamber and sample rack are all made of stainless steel, which will not get rusty after long-term contact with dust and ensure a clean test environment. A tempered glass observation window and built-in LED lights are arranged on the front of the cabinet, so the status of samples can be observed in real time during tests.

A detachable dust replacement device is installed at the bottom of the cabinet to realize complete replacement of waste dust and avoid uneven particle size caused by repeated use of dust. A special vibration device is equipped inside to prevent dust from adhering to the cabinet wall and caking, and maintain stable dust concentration. Mica heating rings are installed in the circulating air duct to heat and dry dust and prevent dust from dampening and agglomerating. The independent vacuum system equipped with air extraction pipe can conduct vacuum pumping tests for samples with air holes, meeting the requirements of high-grade dust tests such as IP6X. The control system consists of a 7-inch touch screen and Panasonic PLC, which is easy to operate. Users can set air blowing duration, vibration duration and total test duration independently, and support program preset and automatic operation. In addition, the equipment is equipped with dual protection against electric leakage and short circuit to ensure the safety of operators and test samples.

Core Technical Parameters and Comparison of Serial Models
LISUN provides dust testing chambers of various specifications to match samples of different sizes and placement ways. The table below shows basic specifications of all serial models and exclusive features of SC-015.

As the main model, SC-015 has the following core technical indicators. The temperature control range is ambient temperature +10℃ to 60℃. The test sieve has wire diameter of 50μm and wire spacing of 75μm, complying with standard dust particle size requirements. Dry talc powder is adopted as test dust with dosage of 2~4kg/m³ under free dust settling mode. The total test duration and vibration duration can be adjusted within 0~999 hours with timing accuracy of ±1 second. The vacuum degree ranges from 0 to 10Kpa and the pumping speed is continuously adjustable from 0 to 4800L/H. The maximum working current of test samples is no more than 10A, so tests can be carried out while samples are powered on to truly simulate actual operating conditions.

Application Scope and Test Procedures of Dust Testing Chamber

Main Application Fields
With stable performance and full standard compatibility, SC-015 dust testing chamber has a wide range of applications. Firstly, it is applied to lighting products. It conducts IP dust tests for lamps in accordance with GB7000.1 to ensure the safe operation of outdoor street lamps and landscape lamps in dusty environment. Secondly, it serves industrial electrical products including electrical cabinets and electrical components, to test the protection performance of industrial equipment in factories and construction sites with heavy dust. Thirdly, it is used for automobiles, motorcycles and their parts. It simulates wind and sand environment during vehicle driving to test the dust resistance of car lights, on-board electrical appliances and line interfaces. Fourthly, it is applied to general electrical and electronic products for R&D verification and factory sampling inspection. For special demands, the equipment can be customized to meet IP5KX and IP6KX high-grade vehicle dust test requirements specified in ISO 20653.

Standard Test Procedures
The test using SC-015 dust testing chamber includes five steps. First, clean the chamber, fill with specified amount of dry talc powder, and check the normal operation of vibration, heating and vacuum systems. Second, fix samples on the sample rack and place them vertically or horizontally as required. Connect power supply for samples if power-on test is needed. Third, select the corresponding test standard on the touch screen, and set parameters such as test temperature, duration, vacuum degree and vibration interval. Fourth, start the equipment. Dust settles and circulates inside the chamber, and the system automatically completes air blowing, vibration and vacuum pumping. Fifth, let the chamber stand for a period after the test, then take out samples. Check the appearance, internal dust accumulation and operating performance, judge the test result against standards and generate test reports. The whole process features high automation, minimal manual intervention and excellent repeatability of test data.

Conclusion

The dust testing chamber is essential equipment to verify product reliability in dust environment and determine IP protection grade, and plays an irreplaceable role in quality control of electronic products, lighting equipment, industrial electrical appliances and transportation vehicles. With reasonable structural design, precise parameter control, complete safety protection and full standard adaptability, LISUN SC-015 dust testing chamber can efficiently complete dust resistance tests for electrical and electronic products, lamps, electrical cabinets as well as auto and motorcycle parts. It helps R&D staff find defects in sealing and structural design so as to optimize product schemes, and provides authoritative and valid test data for factory inspection and third-party certification.

With the continuously improving requirements for industrial product reliability, dust environment test has become an important link for products to enter the market. As a typical model, the dust testing chamber represented by SC-015 has become important infrastructure for enterprises to improve product quality, meet industry standards and enhance market competitiveness due to stable operation and wide applicability. It will keep playing a vital role in the field of environmental reliability testing.