There are two reasons for the pressure loss of the turbine flowmeter.
One is part of the pressure loss caused by the mechanical resistance of the turbine rotor to the kinetic energy of the fluid.
The greater the flow, the higher the speed of the turbine, the greater the mechanical resistance, and the greater the pressure loss caused. This is the main factor in the pressure loss of the turbine flowmeter.
The second is the pressure loss caused by the viscous resistance of the fluid.
The greater the viscosity of the fluid, the greater the viscous resistance produced. In addition, the pressure loss is also related to the nominal diameter of the instrument.