RTT2 thermal resistance isolation transmitter is mainly applied in the control system. It can switch thermal resistance signals to two group of 4～20mA standard current signals and isolated transmitted to DCS system controlling device. It is widely used in distributed control systems (DCS), Supervisory Control and Data Acquisition System (SCADA), environmental monitoring system (EMCS) and so on. The output is related to temperature linearly. They are all isolated among input, output and power supply.