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- Metering Pump - Effect of Ambient / Fluid Temperature -
Metering Pump - Effect of Ambient / Fluid Temperature -
The changes in ambient temperature and fluid temperature can affect pumped volume and repeatability. These effects happen 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 500 mm3 when the ambient temperature and the fluid temperature are 24°C.
Other than the conditions specified, the measurements follow the standard test conditions.
Note: Details such as specifications, etc., may be changed without notice.
Experimental Data of the Pumped Volume and the Repeatability Versus the Temperature
| Ambient Temperature & Fluid Temperature (°C) | Pumped Volume (mm3) | Repeatability* (%) |
| 10 | 461 | +4.64% |
| -4.70% | ||
| 24 | 497 | +0.64% |
| -0.62% | ||
| 40 | 550 | +2.20% |
| -2.89% |
Note 1: Details such as specifications, etc., may be changed without notice.
Note 2: (*Upper Row： Error of the Max. Value, Lower Row： Error of the Min. Value)
Reference
Temperature changes can affect the pumped volume and decrease repeatability. The temperature change can be prevented by replacing elastomeric parts with non-elastomeric parts. The following is an example of a pump's measured pumped volume and repeatability containing no elastomeric parts when ambient temperature and fluid temperature are varied.
Model Number Used: NRP-150T-1 (Maximum Pumped Volume = 150 mm3, 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 150 mm3 when the ambient temperature and the fluid temperature are 24°C.
Other than the conditions specified, the measurements follow the standard test conditions.
Note: Details such as specifications, etc., may be changed without notice.
Experimental Data of the Pumped Volume and the Repeatability Versus the Temperature
| Ambient Temperature & Fluid Temperature (°C) | Pumped Volume (mm3) | Repeatability* (%) |
| 10 | 146 | +0.88% |
| -0.84% | ||
| 24 | 150 | +0.36% |
| -0.46% | ||
| 40 | 155 | +0.46% |
| -0.32% |
Note 1: Details such as specifications, etc., may be changed without notice.
Note 2: (*Upper Row： Error of the Max. Value, Lower Row： Error of the Min. Value)
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