Huntleigh Flowtron AC550, Руководство по обслуживанию

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4.4 Pressure Display Calibration
The
Flowtron
®
Excel
utilizes a precise and accurate pressure management
system which is not expected to require re-calibration until after several years of
continuous use. The measurement system automatically handles any adverse
effects due to drift or temperature change and should not require any user
intervention. However, the pressure display should be verified for accuracy at
each service interval.
4.4.1 Calibration Check
Equipment required:
A calibrated Manometer/Pressure Meter with range of 100 mmHg and accuracy
of better than 0.5 mmHg.
Ensure that the pressure control knob is set to the midpoint of the 40 mmHg
marked area (12 o’clock position).
Switch the pump on without any tubes or garments connected. Attach an
external manometer to either of the garment ports.
Select service mode as detailed in Section 3.2.
This pressure reading will cycle in the same manner as therapy would normally
occur. Thus the display should show a constantly low reading (i.e., <3 mmHg
for approximately an 18 second period, followed by a higher set therapy
pressure reading of 37-43 mmHg for a 12 second period). This cycle will repeat
itself every 30 seconds on alternate ports. If the system calibration is correct,
the displayed pressure accuracy should be within ± 3 mmHg of the reference
external manometer/meter reading on both ports.
4.4.2 Pressure Display Re-calibration Procedure
Equipment required:
· Calibrated source of regulated non-pulsatile air at pressure of 70 mmHg
± 0.5 mmHg
· Calibrated Manometer / Pressure meter with range of 100 mmHg and
accuracy of better than 0.5 mmHg
· Trimming tool / small screwdriver
If at any time during the calibration process the pump displays ‘CF’ and beeps
continuously, this indicates a Calibration Fault and the procedure should be
restarted.
247901 4-4 Issue 1
March 1998