With the digital multisensor E04, SIKA offers a compact sensor solution for the simultaneous measurement of temperature, relative humidity and CO₂. The sensor is designed for use in vehicle HVAC systems and supports precise, demand-based climate control in the passenger compartment.

It features high vibration resistance and a durable design.

The sensor has been tested in accordance with DIN EN 61373 (Category 1, Class A) as well as other relevant railway standards, including DIN EN 50155, thereby meeting key requirements for use in rail vehicles.