Datex-Ohmeda 7100 Technical Reference Manual

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Datex-Ohmeda 7100 Technical Reference Manual Manual pdf 74 page image

7100 Anesthesia Ventilator4-34 02/03 1006-0836-0004.10.10Test Inspiratory ValveThis test only checks the control circuit for the Inspiratory Valve. Since it doesnot look at the output of the Inspiratory Valve, you do not have to have an activedrive gas supply.To Test the Inspiratory Valve the software opens the inspiratory valve inincrements until the flow valve is completely open.• At each of the settings of the inspiratory valve the A/D channel forFlow DAC Feedback is recorded.• If the A/D for the Flow DAC Feedback is not within the correcttolerance the test fails.Remarks A failure can be caused either by the control circuit or a flow valve malfunction.To check the control circuit,1. Go to the “Valves - Test Tool” menu.2. Set the Inspiratory Valve to 0.25 L/min. The “Flow Valve Volt” readingshould increase slightly.3. If the reading jumps high (~ 6 Volts), the control circuit for the InspiratoryValve is open or the Inspiratory Valve is defective.4. Measure the resistance between the leads at the unplugged InspiratoryValve connector. A multimeter should read 1.5 ±0.15 ohms.