The Official Journal of the European Union (OJEU) published Regulation (EU) 2026/789 on May 4, 2026, making substantial updates to the electromagnetic immunity (EMS) testing requirements for wireless pressure and temperature-humidity transmitters under the CE-RED Directive. The limit values for 6 immunity items including electrostatic discharge (ESD) and conducted susceptibility induced by radio-frequency fields (CS) have been comprehensively tightened, with some being stricter than the current IEC 61000-4 series standards. This adjustment directly affects the export compliance pathway for wireless sensing devices targeting the EU market, and companies in niche sectors such as pressure sensors, industrial temperature-humidity transmitters, and smart building sensing terminals need to pay close attention.

Event Overview

The Official Journal of the European Union (OJEU) officially published Regulation (EU) 2026/789 on May 4, 2026, clearly revising the electromagnetic compatibility (EMC) immunity (EMS) testing requirements in the annexes of the Radio Equipment Directive (RED, 2014/53/EU). It applies to sensor devices with radio-frequency communication functions, such as wireless pressure transmitters and wireless temperature-humidity transmitters. The new regulation takes effect from the date of publication, and type testing and conformity assessment must be carried out in accordance with this regulation; products that have not completed testing under the new requirements and obtained valid reports may not affix the CE marking to enter the EU market.

Which Segments Will Be Affected

Direct Trading Enterprises

These companies export wireless sensing devices to the EU under their own brands or through ODM arrangements. Since the CE marking is a mandatory market access credential, the new regulation will directly block their customs clearance and product listing processes. The impacts are mainly reflected in the following: models that previously passed testing under the old RED version will need to undergo all 6 immunity type tests again; for some companies, declarations issued by third-party laboratories stating “compliant with IEC 61000-4-X” will no longer satisfy the requirements of Regulation (EU) 2026/789.

Processing and Manufacturing Enterprises

Companies focused on wireless sensor modules, PCB assembly, or complete device contract manufacturing must ensure that their deliveries meet the CE compliance requirements specified by downstream customers. The new regulation leads to longer design verification cycles and higher rectification costs—for example, ESD protection circuits may need to be redesigned, and filter component selection must cover higher frequency bands and stronger coupling intensity; if the new version testing is not completed before mass production, companies may face risks such as order suspension or contract breach.

Supply Chain Service Enterprises

These include third-party service providers such as CE technical documentation preparation agencies, EMC testing laboratories, and NB notified bodies. The new regulation brings operational changes such as additional test items, stricter limits, and updated report templates, requiring adjustments to service response cycles and pricing structures. In particular, small and medium-sized laboratories that have not adapted their testing capabilities in advance to Regulation (EU) 2026/789 may face tight testing schedules and increased dependence on outsourcing for critical projects.

What Key Points Should Relevant Companies or Practitioners Focus On, and How Should They Respond Now

Pay Attention to Follow-up Official Guidance on the Regulatory Text and Transitional Arrangements

At present, it is only known that Regulation (EU) 2026/789 has been published, but the European Commission has not yet simultaneously issued supporting guidance (such as application instructions, supplementary explanations of test methods, and whether existing certificates may continue to be used). Companies should continue to track official EU websites and notices from various NB bodies to avoid launching ineffective corrective actions based on non-authoritative interpretations.

Identify High-risk Product Categories and Prioritize Gap Analysis

Focus on models of wireless pressure/temperature-humidity transmitters exported to the EU that have already obtained CE certification but do not yet cover the 2026 version immunity requirements, especially designs using general-purpose RF modules (such as ESP32 and the nRF52 series) without customized EMC hardening. It is recommended to immediately compare the old and new limit tables and identify items prone to exceeding the limits, such as ESD contact discharge and the CS 150kHz–80MHz frequency band.

Differentiate Between the Regulation’s Effective Date and the Actual Market Enforcement Pace

Although the regulation was published on May 4, 2026, customs and market surveillance authorities show enforcement lag in on-site checks of the CE marking. What currently deserves more attention is this: from the fourth quarter of 2026, EU importers may proactively require test reports compliant with (EU) 2026/789; from early 2027, NB bodies may stop accepting applications for old-version EMS testing. Companies should not wait until enforcement becomes stricter before taking action, but should treat this as a forward-looking window for technical compliance preparation.

Coordinate Testing Resources in Advance and Reserve Time for Rectification

The new version of the 6 immunity tests must be completed in a full anechoic chamber or shielded room, and the booking cycle generally reaches 4–6 weeks. It is recommended that companies with confirmed export plans complete sample submission for testing before the third quarter of 2026, and reserve at least 8 weeks of buffer time for potential hardware changes such as PCB redesign, housing mold rework, and filter component replacement.

Editorial Viewpoint / Industry Insight

Observably, this regulation is not an isolated technical upgrade, but a preemptive control measure by the EU against the systemic EMC risks triggered by large-scale deployment of low-power wide-area IoT (LPWAN) and industrial wireless sensing devices. Analysis shows, the 40% increase in limit values is not a linear tightening, but a reverse setting based on modeling of coupling paths in typical on-site interference scenarios (such as groups of factory variable-frequency drives and building elevator drives), which means simply stacking protective components will make compliance difficult, and a return to system-level EMC design thinking is required. What is currently more noteworthy is that it marks a shift in the compliance focus of CE-RED for integrated “sensing + communication” devices, accelerating from compliance with radio parameters toward validation of electromagnetic environmental adaptability. The industry needs to continue monitoring whether this will later expand to other wireless sensing formats (such as gas, liquid level, and vibration transmitters).

Conclusion
This regulatory adjustment is essentially a technical raising of the EU market access threshold rather than a signal of a policy shift. Its significance lies not in creating short-term compliance barriers, but in driving export enterprises to shift from a “certification-oriented” approach to a “design robustness-oriented” approach. At present, it is more appropriate to understand this as a compliance evolution with clear time nodes and quantifiable response paths, rather than an unpredictable regulatory mutation. The key to a rational response is to incorporate EMC immunity capability into the early stage of product definition, rather than leaving it for remediation at the certification stage.

Information Source Notes
Main source: Official Journal of the European Union (OJEU), original text of Regulation (EU) 2026/789.
Items for continued observation: follow-up application guidance (FAQ) issued by the European Commission, transitional handling policies of various NB notified bodies for existing CE certificates, and the specific enforcement pace of market surveillance authorities in member states.