This series of devices was specially developed for use in heating technology in boiler systems or storage tanks, district heating transfer stations and heat transfer systems, in ventilation technology as supply air monitoring or as a limiter of electric heating registers and for controlling and monitoring temperatures in pipes and containers. Immersion sleeves, protective coils and fastening sets are not included in the scope of delivery. The JZ-29 fastening set must be used in conjunction with immersion sleeves or protective coils. When used as a feed controller (pipe mounting), the JZ-31 fastening set must be used.