1.Measurement error<0.2% of FS, cold junction temperature compensation error is plus or minus 1 degree, can be corrected by software, resolution 14bit, sampling period 0.15S 2.¡El display function uses an integrated module display: PV(process value), SV(set value), MV(output valve value),which can be monitored at the same time during commissioning and operation, so the system can be commissioned in the fastest and most efficient way. 3.Program control: M900 series is a multi-group and mulit-stage combined program control. ¡El time error is less than 0.5% FS, and the maximum setting time for a section is 999 minutes. Variable gain control can be introdeuced to reduce the tracking error in the heating slope section, and writing measures can be adopted to reduce the running time error of the constant temperature section. 4.Communciation mode: RS485 communication mode: RS485 communciation between master and slave, MODBUS RTU communication, baud rate 9600/19200, master-slave control(4-20mA signal for transmission and external setting) + RS485, DODBUS RTU to the host computer. 5.Transmission output: load 0-929 ohm constant current output error<0.2% FS, linearity error< 0.2% FS, transmission parameters are PV/SV/MV, can be set to reverse transmission 20-4mA(for energy-saving control). 6.It can form cascade control, multi-point equalization, multi-zone decoupling, programmable and other control system(master-slave communication has this function). 7.It can be equipped with SSR non-contact switch to control the valve opening, which is faster. 8.¡El valve position value can be calibrated according to the valve itself. 9.¡El number of in-phase output ports of the power supply controlled by the SCR phase shift can be arbitratily configured for the customer, that is, to realize the simultaneous opeartion of multiple groups of SCR loads with the same phase of the power supply, which provides convenience of the design of the phase shift control system of the extra-large electric power SCR.