Fluke Biomedical IDA-4 Plus - Manual (Page 57)

Infusion Pump Analyzer
Operating Instructions
3
3-35
Measuring Flow-rate against Back-pressure
Safety and performance standards for infusion devices expect manufacturers to
state the flow characteristics under specified backpressure conditions. For
instance, the flow rate might be quoted at zero output pressure, then subjected to
backpressure of +300mmHg, and then -100mmHg. Some infusion devices (e.g.
gastric feeding pumps) will not need to perform well against high back pressure,
whereas other types (e.g. intravenous feeders) must deliver the stated flow rate
against some back pressure.
This instrument can be subjected to backpressure within the range +300mmHg to
-100mmHg to test the effect on delivered flow rate. Backpressure in this range
will not affect flow measurement. Backpressures outside this range are not
recommended.
The following test arrangement is suggested for performing flow rate tests under
back pressure. The pressure at the outlet must be returned to zero before
performing an occlusion pressure test, and when changing infusion devices.
The recommended procedure is as follows:
1. Perform an initial prime.
2. Set outlet reservoir pressure to zero (open to air)
3. Blow AIR through the unit with a large syringe to ensure that there is practically
no water in the outlet tube.
4. Connect to the infusion device to be tested.
5. Pressurize collection vessel to highest required (positive) test pressure
6. Allow infusion device to deliver at least 3 ml.
7. Conduct flow measurements.
8. Reduce pressure in collection vessel to next test value.
9. Repeat steps 6 and 7 as required.
10. Release pressure from collection vessel before disconnection is made.
Remember that disconnecting the circuit under pressure may cause explosive
release of water.
See:- Suggested Apparatus for Back Pressure Testing Drawing (Page 49).