WIKA Alexander Wiegand
The TR21 miniature resistance thermometer is currently the only instrument on the market that combines a housing of only 19-mm dia. with explosion protection, claims the manufacturer. The measuring instrument, developed for sanitary applications, has now obtained ATEX and IECEx approval for the ignition-protection Type Ex i. The combination of compact size, hygienic design and intrinsic safety makes the TR21 a multi-application thermometer for processes in the food and pharmaceutical industries. The TR21 has a measuring range from –50 to 250°C, and is delivered with a direct sensor output (Pt100) or integrated transmitter (4–20-mA output). The sensor can be calibrated without having to open the process. — WIKA Alexander Wiegand SE & Co. KG, Klingenberg, Germany