A Comparative Study of Impeller Modification Techniques on the Performance of the Pump as a Turbine

Table 3

Lists of measuring devices.

No.	Device	Dependent/independent parameter	Range
1	Electromagnetic flow meter	Flow rate (independent)	0-40 m^3/h	0.40
2	Pressure gauge	Pressure 1	0-16 bar	0.50
3	Pressure gauge	Pressure 2	0-16 bar	0.50
4	Digital contact tachometer	Rotational speed	0-4000 RPM	0.05
5	Force meter	Force	0-50 N	0.25
6	Total error equation (12)	—	—	0.85