The JUMO eTRON M electronic microstat is an on/off controller incorporating a defrosting function and operating hours counter for refrigeration control. The eTRON M features a single input (temperature, current, or voltage), multiple available supply voltages, and either one 10A / 250V or two 5A / 250V SPDT relay outputs. A host of smart features such as adjustable switch differentials, freezing of the display value upon initiation of the defrost cycle, time-delayed switch-on after power, multiple alarm types, and available set-up program help make the eTRON M the controller of choice for simple heating or cooling temperature control.

The JUMO eTRON M100 is an electronic refrigeration controller offering two inputs for acquiring the room and evaporator temperatures plus separate relays for the cooling unit (16A / 250V), defrost heating (8A / 250V), and fan (8A / 250V). The controller includes user-configurable cooling, defrosting, and fan functions. There are two pre-set optional configurations available: option 1 can be either an alarm relay (16A / 250V) or audible buzzer, option 2 can be either an RS485 interface or a combination of datalogger, real-time clock, and RS485 interface to enable HACCP monitoring of the cold chain.

The JUMO eTRON T has a similar feature set to the eTRON M but is housed in a space-efficient DIN-rail mounted body for those applications where front-panel access to the controller is potentially not necessary or not desired. The small size of this digital thermostat results in only one available 10A / 250V relay output, but a display of the process temperature/setpoint and LED indication of the relay state are maintained. As in all eTRON units, a customized temperature sensor linearization, for example for thyristors, can be stored in each unit from the factory or via the set-up software.