This is probably the most typical application for process controller controller ATR620.

On electrical kilns ATR620 performs control loop for the programmed cycle, reading thermocouple value and controlling the SSR. In case that alarm conditions such as overshooting of max. temperature are noticed, relay A1 is activated to open the circuit with safety contactor, along with acoustic signal of internal buzzer and a flashing signal on display. Should the kiln door accidentally open, this is also an alarm condition: cycle is stopped and the relevant message is visualized on display.

Programming of main parameters:

P-01	0009	15 cycles available, 20 steps each Special functions are desabled
P-02	1000	Select thermocouple K (ex.:1100 for TC type S)
P-05	5000	Select SSR control output for process 1
P-06	0	Minimum temperature (lower limit scale) 0°C
P-07	1350	Max. temperature (upper limit scale) 1350°C
P-12	1101	Max. temperature alarm with cycle block
P-15	1300	Alarm setpoint: if kiln temperature is over 1300°C, the cycle is stopped.
P-17	5100	Alarm on digital input for cycle block and signal “Open door”