KH102 is a process controller (four limits alarm meter) with high-accuracy measuring and data acquisition compatible. The controller can measure accurately and control many physical data such as temperature, pressure, liquid level, gravity, instantaneous flow and etc. The controller adopts omnipotent input with kinds of input signals. It also adopts modern advanced modular structure output functions such as relay alarm, communication, transmission and feed etc, can be configured flexibly. The alarm output function can be configured flexibly as high limit, low limit, higher limit, lower limit. Modern universal MODBUS communication protocol is available, with maximum baud rate 19200 bit/s.