Transonic HT331-FT - Testing The Clamp-On Flowsensor

AU-OPR-AureFloFT-EN,
Rev H
15
Fig. 4.5: Progression of signal indicator bars
as ultrasonic signal coupling is
achieved. Four green bars indicates a
signal strength ≥ 50% for a factory-
new condition of the Probe/sensor,
acceptable for continued surgical use.
E. Testing The Clamp-On Flowsensor
Perform this test on a uid-lled tubing circuit or a one foot tubing
segment, clamped at one end and lled with water.
IMPORTANT: DO NOT IMMERSE THE CLAMP-ON FLOWSENSOR IN LIQUID.
1) Lubricate the tubing with a thin layer of 70% isopropyl alcohol or surgical gel to promote ultrasonic
transmission.
2) Place the tubing inside the Flowsensor and close the door of the Sensor. The tubing slot will reshape the
tubing to a rectangular shape.
3) Observe the Signal Indicator in “Realtime” mode. The bars will change color from black to red to yellow
to green as the strength of the signal increases and acoustic transmission is attained (Fig. 4.5).
4) When a Flowsensor is connected and there is adequate ultrasonic transmission, ow can be measured.
This is indicated by a waveform on the scrolling bar of the touch-panel display.
Functional Tests
FLOWMETER SIGNAL QUALITY
Signal strength is used to indicate whether a probe is properly
applied; if the probe is properly applied, a low signal strength
does not have any impact on ow accuracy. If your meter displays
30% signal strength, check for the following:
● Air bubbles or other blockages obstructing the ultrasound
signal
● Sufcient couplant within the probe’s sensing window
Once these issues are resolved, measurement can be considered
in tolerance even at signal strength readings of 15%.
100% 75% 50% 30% 15%
Another factor for low signal strength may be:
● Probe condition (wear on handle, reector, connector, etc.)
Contact Transonic for replacement/repair if there is obvious
damage. A received signal reading approaching 15% (while
properly applied) indicates that it is time to consider replacing
this probe.
If Flowmeter's front panel reads NO SIGNAL, contact Transonic
for probe replacement/repair.