The Thermochron (DS1922L, DS1922T, DS1921G) and Hygrochron (DS1923) iButton data loggers are ideal for a diverse range of applications. Because of their stainless steel casing, these devices are
especially useful in harsh environments. Care must be taken, however, not to subject the units to
environmental forces that exceed their specified level of protection.

This application note defines and discusses the IP (Ingress Protection) ratings. It also explains that Thermochron and Hygrochron iButtons are certified to IP56 (dust and strong water jets), but should not be submerged. For a submerged application a waterproof enclosure such as the DS9107 iButton Capsule must be used.