Air purifiers have evolved from niche products to essential household items, driven by years of market development, increasing smog issues, higher consumer awareness about clean air, and the convenience of online shopping. As a result, they've become a "standard weapon" for health-conscious individuals. According to Zhongyikang data, the number of air purifier brands in the market grew from 78 in 2013 to 576 by November 2017, showing a clear "cake effect" that has attracted numerous players into the industry.
With more companies entering the market, regulatory oversight has also intensified. At the end of 2017, the General Administration of Quality Supervision, Inspection and Quarantine conducted a nationwide quality inspection of air purifier products, focusing on safety and performance. While most brands performed well, some well-known names like Mitsubishi and Yuanda failed to meet standards, while emerging brands such as Grünewelt stood out. For example, the LR-500G model from Grünewelt passed all tests with flying colors.
In January this year, the Shanghai Quality and Technical Supervision Bureau also conducted a random quality check of air purifiers, and again, several large brands failed the test. However, Grünewelt's LR-500G remained among the qualified products, reinforcing its reputation for reliability and performance.
Despite being a relatively new brand in China, Grünewelt is a genuine German brand with strong credentials. It holds the GS safety certification, medical-grade air purifier system certification, and has been endorsed by the European Allergy Research Center. It’s widely used in high-end private clinics and laboratories across Europe, offering safe and reliable protection for people with respiratory issues, allergies, and even newborns and mothers.
The flagship model, LR-500G, features a German-engineered motor and DC frequency conversion technology, ensuring low noise levels (as low as 22 decibels) and high-speed operation (up to 1050 RPM). With an air circulation rate of 650 m³/h and a dual-side intake design, it can effectively remove 98% of formaldehyde in a 50㎡ room within one hour, while also eliminating harmful substances like benzene and TVOC. This combination of high performance and quiet operation showcases the advanced engineering behind the product.
Another standout feature of the LR-500G is its four-layer filtration system, which includes a dual formaldehyde decomposition mechanism. The HEPA filter is coated with multi-effect antibacterial material, making it highly efficient at capturing fine particles like PM2.5. Unlike some other brands, it avoids common issues like unpleasant odors, offering long-lasting and effective air purification.
As the air purifier market matures, consumers are becoming more informed and rational in their purchasing decisions. In the past, many buyers were drawn to big international names without fully understanding the product's performance. Now, it's more important to evaluate features like CADR, noise level, and filter efficiency. Brands like Grünewelt offer a balance between quality and affordability, making them a smart choice for those who prioritize both effectiveness and peace of mind.
Currently, the Grünewelt LR-500G is available on JD.com, where it enjoys a 100% positive review rate. While it may not be the most famous name, it's certainly one of the most trusted. In today’s world, where clean air is more important than ever, investing in a quality air purifier is never too late—especially when it comes with proven performance and real value.
The whole series linear power supply adopts industrial-grade metal chassis, pure copper AC/DC multi-insulation high-voltage transformer with varnish treatment, high-reliability multi-transistor filter loop, ensuring the power supplies can run for a long time at full load with high stability, high accuracy, and ultra-low ripple electronic characteristics, equipped with a complete protection circuit, which can better ensure the reliability of the linear power supply itself and the safety of the customer's load.
The output voltage and current can be adjusted by the 10-turn potentiometer with scale and lock on the front, equipped with 4 1/2-digit high-resolution LED meters for output value reading, and RS communication interface can also be added for remote control and monitoring of linear power supplies.
This series of linear high voltage power supplies are mainly used for gas discharge, high-voltage electronic tubes, and can also be applied for other electronic components burn-in test.
Because the output this power supply has HV, the output MUST be connected to the chassis for fixed grounding to ensure the personal safety of the user.
High Voltage Linear Power Supplies
HVLP series Linear High Voltage Power Supplies are High-voltage DC Power Supplies that achieve AC/DC conversion through power frequency transformers and transistor loop control. Compared with switching high voltage power supplies, linear high-voltage power supplies have higher stability, higher accuracy, and lower output ripple. And the most important, because of the use of the power frequency AC/DC conversion principle, the linear power supply has no high-frequency radiation interference, and it is especially suitable for use in places with restrictions on EMC and EMI.
The whole series linear power supply adopts industrial-grade metal chassis, pure copper AC/DC multi-insulation high-voltage transformer with varnish treatment, high-reliability multi-transistor filter loop, ensuring the power supplies can run for a long time at full load with high stability, high accuracy, and ultra-low ripple electronic characteristics, equipped with a complete protection circuit, which can better ensure the reliability of the linear power supply itself and the safety of the customer's load.
The output voltage and current can be adjusted by the 10-turn potentiometer with scale and lock on the front, equipped with 4 1/2-digit high-resolution LED meters for output value reading, and RS communication interface can also be added for remote control and monitoring of linear power supplies.
This series of linear high voltage power supplies are mainly used for gas discharge, high-voltage electronic tubes, and can also be applied for other electronic components burn-in test.
Because the output this power supply has HV, the output MUST be connected to the chassis for fixed grounding to ensure the personal safety of the user.
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Yangzhou IdealTek Electronics Co., Ltd. , https://www.idealtekpower.com