When the target type flowmeter is measuring, the actual fluid will generate viscous friction when passing through the target, and a vortex will be generated behind the target, which will consume a part of the fluid and energy and cause pressure loss.
The pressure loss is related to the caliber of the flowmeter, target diameter ratio, flow rate, and fluid properties.
In the case of the same fluid, the same flow rate, and the same caliber, the smaller the target diameter ratio, the smaller the pressure loss.
The pressure loss of the target flowmeter is generally lower than that of the throttling differential pressure flowmeter, and the pressure loss of the target flowmeter is only 40%-50% of the orifice plate.