|Maquet Servo Ventilator 900 D Ventilator|
|Model||Servo Ventilator 900 D|
|Category||Medical and Biomedical Equipment|
The SERVO Ventilator 900 C/D/E consists of two sepa- rate units. The pneumatic unit comprises the gas conduction system with two pressure transducers, two flow transducers and two servo valves. Each transducer, continuously delivers its actual value to the electronic unit. The servo valves are used as CONTROLLING ELEMENTS for the control of inspiratory and expiratory gas conduction. The electronic unit comprises three controlling systems, two for regulation of inspiration and one for regulation of expiration. The three controlling systems will be in use, one at a time, depending on the TIMING control and the selected ventilation MODE.
These manuals are available for the above equipment:
|Maquet -- Servo Ventilator 900 D -- Service Manual|
|Manual Type||Service Manual|
|Size||2.88 Mbytes (3022360 Bytes)|
|Quality||Electronic document, no scan, very well readable.|
|Upload date||08 March 2018|
|Downloads||347 since 08 March 2018|
The Servo Ventilator 900 was orginally manufactured and sold by Siemens. Please note that this Service Manual has only been re-labeled from Siemens to Maquet. No further significant changes are made. Thus, some information in the Service Manual may be outdated. Introduction ... 4 Principle diagram ... 6 Pneumatic unit Gas flow through the Ventilator ... 8 Gas supply ... 9 Bellows and spring assembly ... . 10 Gas supply unit ... . 11 O2cell ... 12 Relief/safety valve and working pressure manometer ... . 1 2 Flow transducer ... 14 Pressure transducer ... . 15 Inspiratory valve and step motor ... . 16 Expiratory valve and pull magnet ... . 17 Non-return valve ... 17 Transducer interface ... . 18 Electronic unit Principle of operation ... 19 Reference level generation ... 2 0 Regulation of inspiration ... . 23 Timing ... 28 Monitoring ... 33 Regulation of expiration ... 39 Voltage supply ... . 41 Input/output ... . 42 Disassembling Disassembling the pneumatic unit ... . 4 4 Disassembling the electronic unit. ... 44 Replacement of step motor assembly and pull magnet ... 45 Replacement of power supply unit ... . 4 5 Replacement of safety catches ... 45 Replacement of flow transducer ... . 46 Adjustments Adjustment of meters Z1 and Z2 ... . 4 6 Adjustment of valve arm ... . 46 Replacement and adjustment of R5 ... . 47 Removing the front panel knobs ... . 47 Front panel potentiometer adjustments ... . 48 Troubleshooting ... . 49 Index ... . 52 Block diagram ... 56
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