Manufacturer of Valves, Pumps, and Manifolds

Miniature Diaphragm Valves | Compact Inert Valves for Medical and Analytical instrumendts. We take custom orders!

directory HOME > Solutions > Glossary

Welcome to Takasago Fluidic Systems, a leading manufacturer of valves, pumps and manifolds

Metering pump -The effect of operating frequency on repeatability-

A change in operating frequency affects pumped volume and repeatability. When the operating frequency is higher than the value specified on a drawing, repeatability decreases. An example of measured changes in repeatability resulting from varying operating frequencies is shown in the table below.

Model number used: NRP-500P
Measurement conditions: 
The pumped volume is set at 500mm3 when the operating frequency is 2Hz.
(Other than the conditions specified below, the measurements follows the standard test conditions.)


Experimental data of repeatability versus operation frequency

Operating frequency

Repeatability *







Value specified on drawing












Manual operation
Single discharge



 (*  Upper row error of the max. value,  Lower row error of the min. value)


 The list of metering pumps is here!

January 01, 2000 00:01 AM