In metering pumps, what can affect the accuracy of fluid displacement?

The accuracy of fluid displacement in metering pumps is significantly influenced by fluid temperature changes. As the temperature of the fluid varies, its viscosity can change, which directly affects how the fluid moves through the pump. Increased viscosity can lead to greater resistance, causing the pump to deliver less fluid than intended, while decreased viscosity can result in over-delivery. Therefore, maintaining a consistent temperature is crucial for reliable metering, as it helps ensure that the pump operates within its designed parameters for optimal accuracy.

In contrast, while pump size can impact flow rate, it does not directly relate to the accuracy of displacement under the same operating conditions. Ambient humidity generally has minimal effect on fluid displacement since it does not alter the physical properties of the liquid being pumped. Vibration levels may affect the pump's overall operation or integrity, but they are not the primary factor affecting fluid displacement accuracy when compared to temperature.