HH type capacitance differential pressure transmitter and differential pressure transmitter with remote device are new products . They are widely used in petrol, chemical industry, metallurgy, power, light industry, construction material andscience research, etc. to realise measurement of pressure for all kinds of fluids. They go with throttle equipment to test flow rate ofliquid, gas, vapor and liquid with viscosity, precipitation and crystalized particles. They can also test differential pressure, gauge pressure and interface, and liquid level in open container or pressured container.