Humidifier/Ultrasonic Humidifier CE Certification - Based on EN 60335-2-98 Particular Requirements for Humidifiers

With the increasing popularity of healthy living concepts, humidifiers have become common appliances in many homes and offices. For manufacturers, CE certification is a necessary hurdle to overcome if they want to sell their products in the European Economic Area (EEA). Ultrasonic humidifiers, as a mainstream product, re

quire certification based on compliance with harmonized standards under the Low Voltage Directive (LVD) and Electromagnetic Compatibility Directive (EMC), particularly the safety standard EN 60335-1 for household and similar electrical appliances and its particular requirements section EN 60335-2-98.

The full title of the EN 60335-2-98 standard is "Safety of household and similar electrical appliances – Part 2-98: Particular requirements for humidifiers." It is a supplement and modification to the general safety standard EN 60335-1, specifically addressing the unique risks associated with humidifiers. This standard applies to single-phase appliances with a rated voltage not exceeding 250V and other appliances not exceeding 480V, aiming to ensure the safety of humidifiers under normal use and reasonably foreseeable misuse.

Key testing items in the certification process mainly revolve around the following aspects: First, protection against electric shock. Humidifiers contain water sources and circuits; the standard strictly specifies insulation classes, creepage distances, and clearances to prevent leakage caused by moisture. For ultrasonic humidifiers, the working area of ​​their transducer (atomizing plate) also needs to be evaluated to ensure that users cannot access live parts. Second, protection against mechanical hazards. Moving parts (if there is a fan) must be adequately protected, and the casing should be sufficiently robust to withstand impacts, avoiding sharp edges. Third, temperature rise and fire protection. Under prolonged operation, the temperature rise of the casing and internal components must not exceed the limits, and adjacent materials must have sufficient heat resistance and flame retardancy to prevent overheating from causing a fire.

The standard also includes specific provisions regarding liquid leakage and container stability, taking into account the characteristics of humidifiers. Appliances should be designed so that, in the event of tipping over or overfilling, liquid should not leak into locations that could lead to electrical insulation failure or other hazards. Furthermore, the mist produced by ultrasonic humidifiers may carry minerals from the water, forming a "white powder," or promote microbial growth; therefore, the standard also considers hygiene-related structural design, but places greater emphasis on potential safety risks (such as blockages affecting heat dissipation).

Chemical safety is equally important. Materials of components in contact with water must not release harmful substances, and their compliance with food contact material regulations or relevant chemical directives (such as REACH) must be assessed. Noise and vibration must also be controlled within reasonable limits; although this does not directly relate to electrical safety, it may affect the overall product compliance assessment.

Electromagnetic compatibility (EMC) testing is another major component, conducted according to the EN 55014 and EN 61000 series standards. The high-frequency oscillation circuitry of ultrasonic humidifiers may be a source of interference; it is necessary to ensure that the electromagnetic interference generated does not exceed the limits, and that the humidifier itself possesses a certain degree of immunity to interference, enabling stable operation in complex electromagnetic environments.

The CE certification process typically includes: Step 1, Application and Document Submission. The manufacturer submits an application to an EU Notified Body or Compliance Service, providing product technical documentation such as circuit diagrams, instruction manuals, and a list of key components (e.g., power cords, plugs, PCBs, motors, etc., requiring relevant certifications). Step 2, Testing and Evaluation. The certification body conducts comprehensive safety and EMC testing on the submitted products according to standards such as EN 60335-1 and EN 60335-2-98. Step 3, Factory Inspection (if applicable). For certain high-risk products or certification schemes, an audit of the manufacturing plant's quality assurance system may be required. Step 4, Certificate Issuance and Declaration of Conformity (DoC) Signing. After successful testing, the certification body issues a CE certificate, which the manufacturer then signs the DoC and affixes the CE marking.

It is important to note that while the CE marking is a manufacturer's self-declaration of compliance with EU regulations, certification from a Notified Body can significantly enhance market trust and customs clearance efficiency. Continuing compliance requires manufacturers to ensure that mass-produced products are consistent with the test samples and to retain technical documentation for at least ten years.

In conclusion, CE certification for humidifiers is not merely a formality, but a systematic verification of a product's safety, health, and environmental performance. A thorough understanding and compliance with the requirements of EN 60335-2-98 is not only a legal key to unlocking the European market, but also a fundamental measure to improve product quality, build brand reputation, and mitigate liability risks. Manufacturers should incorporate the standard requirements from the design stage, select compliant components, and work closely with professional certification bodies to ensure smooth and efficient certification and a stable future in the international market.