diffusion silicon 4~20mA small differential pressure/pressure/liquid level injection can replace petrochemical,
metallurgy, electric power, food and medicine, papermaking, and textile industries. It is used to detect fluid differential
pressure, pressure, liquid level, density and other parameters, and is tested The signal is converted into 4~20mA.DC and sent to
display, calculation, adjustment or control instruments, which can form various automatic control systems.