Comparison of Saddle-Shaped Region of Head-Flow Curve between Axial-Flow Pump and Its Corresponding Axial-Flow Pump Device

Table 1

Main test instruments of test bench.

Measuring items	Instrument	Instrument model	Accuracy (%)
Head	Differential pressure transmitter	LDG-500s	±0.1
Flow rate	Electromagnetic flowmeter	V15712-HD1A1D7D	±0.2
Torque and rotation speed	Torque and speed sensor	JCZL2-500	±0.1