1.Measurement error < 0.2% of FS, cold junction temperature error is plus or minus 1 degree, can be corrected by software, resolution 14bit, sampling period 0.15S 2.¡El display function uses an intergrated module display: PV(process 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 contro: M900 series is a multi-group and multi-stage combined program control. ¡El time error is less than 0.5% FS, and the maximum setting time for a section is 999 mintues. Variable gain control can be introduced to reduce the tracking error in the heating slope section, and waiting measures can be adopted to reduce the running time error of the constant temperature section. 4.Communication mode: RS485 communication between master and slave, MODBUS RTU communciation, baud rate 9600/19200, master-slave control(4-20mA signal for transimission and external setting) + RS485, MODBUS RTU to the host computer. 5.Transission output: load 0-920 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 casade control, multi-point equalization, multi-zone decoupling, programmable and other control systems(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 arbitrarily configured for the customer, that is, to realize the simultaneous operation of multiple groups of SCR loads with the same phase of the power supply, which porovides convenience for the design of the phase shift control system of the extra-large electric power SCR.