The JNIOR is a very reliable device. I’m sure many devices claim that but as of this writing, in October 2023 we have spoken with customers that are still running Series 3 units from 2005. The first run of Series 4 units are still operational from 2012.
There are basically two components that would have any endurance data.
- The mechanical relays should be able to see a minimum of 100,000 closures.
- The battery should have a life of around 6 years. The JNIOR only relies on the battery to maintain the SRAM and the internal clock when external power is not present. The JNIOR can operate without a working battery. The 410, 412, or 414 battery can be replaced in the field. It is a CR2032 coin-cell battery.