Differential Pressure Flow Meter is also called DP flow meter. Differential pressure flow meters use the principle of differential pressure to measure the flow of liquid, gas and steam. It can measure the flow of gas, steam, liquid and natural gas. It is widely used in petroleum, chemical industry, metallurgy, electric power, heating, water supply and other fields. process control and measurement.

The differential pressure flow meter is measured by the working principle that there is a certain relationship between the pressure difference and the flow rate when the medium fluid flows through the throttling device. Differential pressure (DP) flow meters are the most widely used form of flow measurement products today. Differential pressure flow meters have their own characteristics in different fields of use.

Parameter :

Nominal diameter




Reynolds number range

when 0.30≤β≤0.44, 70000≤ReD≤107

When 0.44≤β≤0.8, 20000≤ReD≤107

Nominal pressure


Aperture ratio


Measuring media

liquid, gas, steam

Connection method

Pipeline flange, butt welding

Flange material

Carbon steel, stainless steel or others

Flange standard

ANSI American standard, DIN European standard


±0.2% of the maximum measuring range/12 months

Signal output

analog 4~20mADC+hart signal, RS485

Turndown ratio

1:5, 1:10, 1:65

Explosion proof grade flameproof ExdIIBT5Gb; Intrinsic safety ExiallCT4/T5/T6Ga;

Pressure taking method

corner connection, flange pressure, D-D/2 take pressure