TFS Takasago Fluidic Systems

Metering pump -The Effect of Operating Frequency on Repeatability-

March 30, 2020

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
5 Hz



3.3 Hz +5.08%
2 Hz (Value specified on drawing) +0.09%
1.7 Hz +0.09%
1.3 Hz +0.07%
1 Hz +0.10%
Manual Operation (Single Discharge) +0.12%

(* Upper Row: Error of the max. value, Lower row: Error of the min. value)

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