Datex-Ohmeda Aestiva 7900 SmartVent, Техническое справочное руководство

Страница: 109 / 204

4b Tests and Calibration 1.X/3.X Software
1006-0453-000 05/04 4b-27
4b.9.5 Calibrate
Bleed Resistor
The software calibrates the bleed resistor as described below. Other than the
setup procedure, this calibration is completely automated.
Note: Step 5 in software revision 1.0 indicates that you should set the fresh
gas flow to “10 Lpm”. The correct setting is “3 Lpm”.
Software procedure
Then software performs the calibration as follows:
1. Opens the flow valve to the starting point that was found (where
manifold pressure is 91-92 cm H
2
O).
2. Waits for the flow to stabilize.
3. Once the flow stabilized, sets the flow to 12 L/min.
4. Wait for the flow to stabilize.
5. Repeat steps 1-4, replacing step 3 with 11 L/min, 10 L/min, 9 L/min and
so on to 1 L/min.
Therefore, there are 12 points that are calculated for the bleed resistor
calibration. Calibration points may be greater than the listed cm H
2
O, but if
any one of these points is less than the cm H
2
O listed below, calibration fails.
If the calibration passes, the calculated bleed resistor calibration points are
stored in EEPROM.
Remarks
If the bleed resistor calibration test fails, check altitude and drive gas settings.
Ensure that the breathing circuit gas is exhausting out the scavenging port
during the test. A negative finding indicates a massive circuit leak. Check for
proper regulator pressure calibration. Ensure that the Flow Valve Cal test was
conducted properly. Otherwise, failure indicates a calibration problem with
the flow valve.
(12) ≥ 46 cm H
2
0 (8) ≥ 23.3 cm H
2
0 (4) ≥ 6.9 cm H
2
0
(11) ≥ 36.7 cm H
2
0 (7) ≥ 18.2 cm H
2
0 (3) ≥ 3.7 cm H
2
0
(10) ≥ 32.2 cm H
2
0 (6) ≥ 14.4 cm H
2
0 (2) ≥ -5 cm H
2
0
(9) ≥ 27.8 cm H
2
0 (5) ≥ 10.6 cm H
2
0 (1) ≥ -5 cm H
2
0