| Influence of Temperature on
Flow Rate |
The factory set flow rate for an Infu-DiskTM
pump is based on a standard temperature of 25°C. Variation from
this temperature will cause flow rate to vary from it’s
factory set rate. Figure 6 shows the percent variation of flow
rate at temperatures other than the standard temperature.
|
 |
Figure 6 Influence of
Temperature on Infu-DiskTM Factory Set Flow Rate
|
Note that a positive offset
represents an increase in the set flow rate and a negative
offset represents a decrease.
|
| Influence of Viscosity on Flow
Rate |
The influence of delivery fluid
viscosity on the fluid delivery rate of an Infu-DiskTM
pump is minimal or negligible for typical applications. In most
applications the Infu-DiskTM
pump will be
attached to an additional length of tubing. For tubing with
small bore sizes or long lengths the fluid delivery pressure may
increase to a level where the fluid delivery rate is affected
significantly. Figure 7 shows the increase in fluid delivery
pressures for various tubing dimensions.
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 |
Figure 7 Influence of Viscosity
on Infu-DiskTM
Factory Set Flow Rate
|
Note that unlike figures 5 and 6
the positive offset in figure 7 represents a decrease in set
flow rate.
|
| A fluid that has a viscosity of up
to 20 cp delivered through a tube 24 inches long with an inside
diameter of 0.030 inches (L/D4 = 1.8×106
cm-3) will not produce a change in fluid delivery
pressure to significantly affect the fluid delivery rate.
Changing the tubing inside diameter to 0.007 inches in the
example above will affect the fluid delivery rate by up to 30%.
It is recommend that the tubing that is attached to the Infu-DiskTM
pump have an inside diameter of at least 0.030 inches and have a
length less than 36 inches. |
