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Technical description A-EV1
Document No. 8502855
C-19
Electrical flow measurement unit
Driving gas flow to circuit is measured by flow measuring device. This device consists of restrictor and
pressure difference sensors. The reading of the sensor corresponds to flow. Flow is calibrated with an
external device. There are five calibration points. 2nd order polynomials are fitted to the data. As a
result there are four (4) calibration curves for flow sensor. Calibration points are saved into EEPROM
and calibration curves are calculated at startup
The flow measurement unit measures the pressure differential in a flow path restrictor.
The flow measurement unit comprises:
•
Pressure Sensor
The output voltage of the pressure sensor (tenths of millivolts) is amplified by an amplifier to a level
which is suitable for the A/D converter in the ventilator CPU board. The gain of the amplifier is set
according to the type of sensor being used and the pressure signal of the measurement unit.
•
Flow Restrictor
•
Zeroing Valve
The zeroing valve compensates for pressure sensor zero drift.
Figure 17
The electrical flow measurement unit
Pressure sensor boards
The pressure sensor boards measure the flow and pressure signals. There are six pressure sensor
boards in the ventilator control unit:
•
The pressure sensor board for driving gas flow during inspiration.
The measurement is based on the pressure drop
in a flow path restrictor. The pressure sensor
board consists of a pressure sensor, a flow path restrictor and a zeroing valve to compensate for
the pressure sensor zero drift. The pressure sensor board is - pneumatically - positioned
downstream the inspiration valve.
•
The pressure sensor board for the circuit pressure and the pressure sensor board for monitoring
pressures.
Monitoring and circuit pressure are the same signals. Because the patient circuit pressure has
to be checked all the time, this measurement is doubled. When one of them is zeroed the other
one is used.
Содержание Anesthesia Delivery Unit S/5
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Страница 62: ...Maintenance Document No 8502852 5 4 Figure 1 Service menu overview ...
Страница 76: ...Datex Ohmeda ADU 5 18 Document No 8502852 Figure 24 Transformer unit Figure 25 Transformer unit 2 1 4 6 ...
Страница 80: ...Datex Ohmeda ADU 5 22 Document No 8502852 Figure 30 Compact Circuit A CC1 exploded view 5 1 2 3 4 ...
Страница 88: ...Maintenance 5 30 Document No 8502852 Figure 38 Maintenance parts ...
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Страница 132: ...Forms and charts 7 8 Document No 8502852 Pneumatic chart of the Electronic Ventilator A EV1 ...
Страница 133: ...Forms and charts Document No 8502852 7 9 Pneumatic chart of the Fresh Gas Control Unit A FGC1 ...
Страница 135: ...Forms and charts Document No 8502852 7 11 Pneumatic chart of Table frame without A FGFI ...
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Страница 137: ...Document No 8502852 7 13 Pneumatic chart of A WGU frame without A FGFI ...
Страница 138: ...7 14 Document No 8502852 Pneumatic chart of A WGU frame with A FGFI ...
Страница 139: ...Document No 8502852 7 15 Pneumatic chart of Table frame without A FGFI ...
Страница 140: ...7 16 Document No 8502852 Pneumatic diagram of table frame with A FGFI ...
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Страница 147: ...Technical bulletins Document No 8502852 9 1 9 TECHNICAL BULLETINS ...
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Страница 211: ...Spare parts A AUF Document No 8502853 A 59 Figure 53 Exploded view of the gas inlet block and the gas labels 4 1 2 3 ...
Страница 229: ...Technical description A FGC1 Document No 8502854 B 3 Figure 3 Technical principles of the A FGC1 ...
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Страница 257: ...Technical description A FGC1 Document No 8502854 B 31 Figure 25 CPU Board block diagram ...
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Страница 307: ...Spare parts A FGC1 Document No 8502854 B 81 Figure 60 Fresh Gas Control Unit A FGC1 1 2 4 3 6 5 7 8 10 11 12 ...
Страница 311: ...Spare parts A FGC1 Document No 8502854 B 85 Figure 64 Parts inside the A FGC1 1 2 3 4 5 6 7 8 10 ii iii i iv 9 ...
Страница 319: ...Spare parts A FGC1 Document No 8502854 B 93 Figure 71 Gas connection unit 1 2 3 4 5 6 7 8 9 10 11 ...
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Страница 362: ...Datex Ohmeda ADU C 36 Document No 8502855 The ventilator calibrating tree Figure 27 The ventilator calibrating tree ...
Страница 400: ...Datex Ohmeda ADU C 74 Document No 8502855 Ventilator diagnostic page layout Figure 42 Ventilator diagnostic page ...
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Страница 417: ...Spare parts A EV1 Document No 8502855 C 91 This page is intentionally left blank ...
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Страница 432: ...Datex Ohmeda ADU D 2 Document No 8502856 Figure 1 Principle of the Central Electronics ...
Страница 477: ...Troubleshooting A ELEC Document No 8502856 D 47 Trouble shooting PCMCIA Card Figure 57 Troubleshooting PCMCIA Card ...
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Страница 483: ...Spare parts A ELEC Document No 8502856 D 53 Figure 60 11 12 1 2 4 3 5 6 3 8 9 13 14 15 16 10 ...
Страница 486: ...Datex Ohmeda ADU D 56 Document No 8502856 Figure 63 Transformer unit Figure 64 Transformer unit 2 1 4 ...
Страница 487: ...Spare parts A ELEC Document No 8502856 D 57 Figure 65 Transformer unit 5 3 ...