DATREND Systems vPad-IV, Operating Manual

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vPad-IV OPERATORS MANUAL
Instantaneous
Flow
The incremental increase in volume ∆V divided by the amount time ∆T required to
infuse the volume ∆V. The flow observation window ∆T may be set to 10, 30 or 60
seconds by means of the More Settings menu (see Section 4.8.7.1 on page 71).
Back Pressure
Pressure (or vacuum) detected in the IV line, which may oppose (or assist) the flow
from the device under test; the source of such pressure or vacuum may be located at
the Output port of the vPad-IV Module (see Section 3.5.2 on page 19 for further
details)
4.5.4.2 Occlusion pressure readouts
Pressure
Occlusion tests display as principal readout the pressure developed by the infusion
device into a blocked IV line
Elapsed Time
Time since the start of the occlusion test
4.5.4.3 Automatic test readouts
Setting
and Range
When a tolerance is applied to the Volume and/or Flow measurement, the setting of
the device under test (DUT) and the pass/fail acceptance range will be shown below
the corresponding principal readout, alternating once every few seconds between the
DUT setting and the pass/fail range.
Time
Remaining
Time until the end of the test duration as defined in the AutoSequence
Flow Errors
Flow measurement error based on the ml/h rate setting of the device under test
4.5.4.4 Readout update interval
When testing flow, the frequency of display update will depend to some extent on the rate being measured.
Above 7 ml/h, volume and average flow readings are updated once every two to ten seconds, depending on
the rate. For rates less than 7 ml/h, the time required to measure volume and flow becomes inversely
proportional to the rate. For example, a measurement at 1 ml/h will require approximately 70 seconds per
reading.
The time required to measure volume and average flow is set by physical characteristics of the vPad-IV
Module. Instantaneous flow, on the other hand, is calculated from the recorded volume data and will
depend on the choice of flow observation window ∆T (10, 30 or 60 sec) that has been selected by means of
the More Settings menu (Section 4.8.7.1, page 71).
When testing occlusion pressure, the reading is updated once every two seconds.
Operation/Chapter 4
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