... instrument 1.Heating & cooling control 2.Universal signal input. 3.Dual &PID AN808 Series Advanced Universal PID Programmable Temperature Controller & adjustor Features ... , 24VDC/30mA(For driing SSR) 4-20mA current output: drive load≤600ΩInput signalTC:K, J, E, T, R, S, B ... current: 4-20mA, Linear resistance: 0-400Ω AN808 Series Advanced Universal PID Programmable Temperature Controller & adjustor