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Metering pump – Effect of ambient / fluid temperature –

Changes in ambient temperature and fluid temperature affect pumped volume and repeatability. This happens because the hardness of the elastomer used for the wetted parts is affected by temperature. The table below shows an example of measured pumped volume and repeatability when ambient temperature and fluid temperature are varied.

Model number used: NRP-500P
Measurement conditions: 
The pumped volume is set at 500mm3 when the ambient temperature and the fluid temperature are 24°C.
(Other than the condition specified below, the measurements follows the standard test conditions.)

 

Experimental data of the pumped volume and the repeatability versus the temperature

Ambient Temp. & Fluid Temp.
(°C) 

Pumped Volume
(mm3)

Repeatability *
(%)

10

461

+4.64%

-4.70%

24

497

+0.64%

-0.62%

40

550

+2.20%

-2.89%

 

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

 

 

Reference:
Changes in pumped volume and a decrease in repeatability due to temperature change can be prevented by replacing elastomeric parts with non-elastomeric parts. The following is an example of measured pumped volume and repeatability of a pump containing no elastomeric parts when ambient temperature and fluid temperature are varied.

Model number used: NRP-150T-1 (Maximum pumped volume = 150mm3, diaphragm material = PTFE, without any check valves)

 

Measurement conditions: 
-
Instead of check valves, a WTA-2T-M6 solenoid valve (Valve body material: PTFE, Diaphragm material: PTFE) is connected to each the inlet and outlet of the metering pump.
- The pumped volume is set at 150mm3 when the ambient temperature and the fluid temperature are 24°C.
(Other than the condition specified below, the measurement follows the standard test conditions.)

 

Experimental data of the pumped volume and the repeatability versus the temperature

Ambient Temp. & Fluid Temp.
(°C) 

Pumped Volume
(mm3)

Repeatability *
(%)

10

146

+0.88%

-0.84%

24

150

+0.36%

-0.46%

40

155

+0.46%

-0.32%

 

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

 

 Please visit the list of metering pumps.

January 01, 2000 00:01 AM

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