TFS Takasago Fluidic Systems

Metering Pump -Standard Test Conditions-

March 31, 2020



  • PTFE tube (I.D. x O.D. = 2 x 3mm) is used for the tubing.
  • The length of the tubing is set at 1000 mm on the inlet side and 100 mm on the outlet side.
  • A reservoir tank is placed below the metering pump. The height from the liquid surface to the inlet is set at 500 mm.
  • The height of the tip of the outlet tube is set at 0 mm from the horizontal plane.
  • Depending on the set pumped volume, a nozzle is installed at the end of the tube to reduce the diameter of the tube.*

Note: Details such as specifications, etc., may be changed without notice.

Note*: If the discharge of the metering pump is set low and the diameter of the tube is large, the pump may not discharge liquid in each cycle due to the influence of surface tension, etc.

Pumped Volume and Nozzle Installation Guide

Set Pumped Volume (mm3) 10 - 50 50 - 100 100 and Over
Diameter of the Nozzle Tip (mm) 0.5 1.5 No Nozzle

Operating Conditions

  • Ambient temperature and fluid temperature: The temperature is maintained at room temperature (20°C).
  • The rated voltage is applied. It is operated with the maximum operating frequency and duty cycle of 50%. Example: In the case of NRP-500P, it is used with the operating frequency of 2 Hz (ON: 250 ms, OFF: 250 ms).

Measurement Conditions

  • The liquid used for this measurement is water.
  • The metering pump is continuously operated until the metering pump's inside and the tubing is filled with the fluid before the measurements are commenced.
  • The pumped volume of 10 cycles is measured by gravimetry, after which the pumped volume per cycle is calculated.

Measuring the Accuracy of the Discharge

  • The pumped volume of 10 cycles is measured ten times, and the average is calculated.
  • The difference between the maximum and minimum values of the ten cycles and the average is determined. The repeatability of pumped volume is expressed in percentage variation from the average.

Note: Details such as specifications, etc., may be changed without notice.

Please feel free to contact us for more information about the technical details of the Metering Pump - Standard Test Conditions.