(Engerwitzdorf, December 2025) Industrial processes place stringent demands on measurement technology. Extreme ambient conditions, aggressive media, chemically intensive cleaning and the need for accurate, fail-safe data are common. Conventional sensors soon reach their limits – due to condensation, corrosion, temperature extremes or labour-intensive maintenance. Developed specifically for these applications, the HTS401 combines a robust protection concept with high measurement accuracy, easy system integration and a maintenance concept designed to minimise process interruptions.

To keep the sensor ready for operation even under severe stress, the HTS401 combines the proprietary E+E sensor coating with the Condensation Guard, a heated sensing unit that actively counteracts dew formation on the sensing element. As soon as the ambient conditions indicate a risk of condensation, the sensor temperature is raised slightly and automatically. This prevents moisture build-up on the sensor surface and keeps the output signal stable. Complemented by the Automatic ReCovery function (ARC), the sensing element actively protects itself against harmful chemical influences. This reduces corrosion-related failures and measurement drift, extends service life and minimises maintenance interventions – especially in applications with high humidity and routine automated cleaning or sterilisation.

Maintenance without process interruption – fast calibration via module replacement

With integrated rapidX technology, the HTS401 simplifies maintenance and calibration: the sensor module can be replaced tool-free in the field in just 10 minutes, including filter replacement and access preparation. On-site calibration is no longer required, as each rapidX sensor module is factory pre-calibrated and delivered with a digital 3.1 inspection certificate according to DIN EN 10204-3.1.

High accuracy for stable control

With measurement accuracy up to ±0.95 % RH and ±0.1 °C and an operating range from −40 °C to +80 °C, the HTS401 delivers reliable values from outdoor areas to controlled environments such as cleanrooms. For additional flexibility, the HTS401 also calculates key parameters derived from relative humidity directly in the device, such as dew point, mixing ratio or enthalpy.

Easy system integration and flexible versions

The HTS401 supports digital and analogue interfaces and can be configured using the E+E PCS10 software. This allows quick integration into existing automation and building management systems. Wall-mount and duct versions are available, as well as remote-probe variants; an optional display can visualise multiple measured variables simultaneously.

Typical applications

The HTS401 is optimised for a wide range of applications, including high-end HVAC (e.g. data centers, swimming halls, outdoor applications), agriculture (greenhouses, stables, storage and ripening), pharmaceutical applications (cleanroom monitoring) and food and beverage processes such as meat and cheese maturation. 

The HTS401 stands for precise, fail-safe humidity and temperature measurement with minimal maintenance effort. As the successor to the EE212 and EE210, it helps operators keep processes under stable control, use energy more efficiently and plan service interventions more reliably.