The WIKA UPT-20 and UPT-21 are intelligent, universal process transmitters designed for precise pressure measurement in demanding industrial environments, sharing core features such as integrated temperature compensation, HART® digital communication, an adjustable turndown ratio up to 20:1, a 330° rotatable housing, and available options with global approvals (such as ATEX and IECEx) for use in hazardous areas.

The key difference lies in their process connection design: the UPT-20 utilizes a conventional threaded internal pressure port designed for clean liquids, gases, and high-pressure lines in applications like chemical processing, compressor systems, and plant hydraulics, whereas the UPT-21 features a flush-mounted diaphragm that eliminates dead spaces where media could clog or accumulate, making it ideal for viscous, crystallizing, or hygienic fluids in food and beverage production, pharmaceutical lines, and polymer or paint processing.