142 Appendix B: Flow Rate Accuracy
Manual 41018v0800 SIGMA Spectrum Infusion System
Revision B Operator’s Manual
WARNING Low Flow Rate Accuracy/Continuity.
At flow rates of 2 mL/hr or below, flow rate accuracy is ± 0.1 mL/hr. If
higher accuracy is required, consider an alternate infusion device.
WARNING Flow Rate Inaccuracy.
Rate accuracy can be affected by variations of fluid viscosity, fluid
temperature, head height or back pressure, or any combination
thereof. In addition to IV set specific warnings, the following can
cause flow rate inaccuracies and must be avoided:
Incompatible brand IV sets and compatible brand IV sets with
unusually large or small diameters or unusually stiff materials.
Using a dropped, damaged, dirty or wet Pump.
Pressurizing IV bags.
Non-vented IV sets with rigid non-vented containers.
Vents on sets or burettes left in the closed position when they
should be open.
Using Minidrip chambers for flow rate settings greater than
200 mL/hr. Doing so may influence flow rate accuracy and cause
air in line or upstream occlusion alarms.
Laying the IV container flat. Doing so may influence flow rate
accuracy and cause upstream occlusion and air in line alarms.
Exceeding 500 mL/hr flow rate settings when using sets with
backcheck valves. Doing so may influence flow rate accuracy or
cause air in line or upstream occlusion alarms.
Flow rates above 300 mL/hr may cause fluid to be siphoned from
the primary container during a secondary infusion. See
“Secondary Infusion” on page 58.
NOTE: Not applicable with non-DEHP tubing because 250 mL/hr is
the maximum flow rate per warning statement.
Flow Profile
The graphs presented in this section represent the variation in flow rate that is recorded from the
time an infusion is started to the end of a two-hour period. See “Baxter Administration Set
Accuracy Graphs” on page 144. Each graph is intended to provide a picture of the “general
stability” with time of the infusion and is commonly called a “start-up curve”. The techniques and
methods of test and generation are detailed in IEC 60601-2-24, Medical electrical equipment –
Part 2-24: Particular requirements for the safety of infusion pumps and controllers.
CAUTION Accuracy.
Refer to trumpet curves for flow rate accuracy as a function of short
infusion durations.
The upstream occlusion detector may not detect partially occluded
tubing.
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