Datex-Ohmeda 7100, Technical Reference Manual

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7100 Anesthesia Ventilator
5-18 02/03 1006-0836-000
5.4.4.A MIA board
evaluation
(Aestiva machine)
1. Remove the Bellows Assy and Breathing Circuit subfloor to access the MIA
pneumatic circuit connections.
2. Enter the Valves-Test Tool service page and record the bit counts on the
inspiratory and expiratory flow transducers.
3. Connect the calibration orifice test tool ( A ) to the drive gas port (not the
pilot pressure port used for PEEP calibration).
4. Install the flow sensor module only (no circuit module).
5. Connect a 22-mm hose from the calibration orifice test tool to the
inspiratory flow port ( B ).
6. Set the inspiratory flow valve to 60 L/min. Gas will exhaust out the rear of
the inspiratory flow sensor where it is normally connected to the circuit
module (reverse flow through the inspiratory flow sensor).
7. Record the change in bit counts observed on the inspiratory flow
transducer channel as compared to step 2 (negative polarity). There may
be some variation in the last digit of the counts, try to pick the average
value.
8. Stop the inspiratory flow.
Refer to Figure 9-7 •
9. Swap the inspiratory channel pneumatic connections (white to black,
black to white)
10. Repeat steps 6 through 8.
11. Move the two inspiratory connections to the expiratory channel of the MIA
(white from harness to blue of MIA pressure transducer, black from
harness to yellow of MIA pressure transducer).
12. Repeat steps 6 through 8 using counts from the expiratory flow transducer
channel.
13. Swap the two inspiratory connections to the expiratory channel of the MIA
(white from harness to yellow of MIA pressure transducer, black from
harness to blue of MIA pressure transducer).
14. Repeat steps 6 through 8 using counts from the expiratory flow transducer
channel.
15. Variation of greater than 40 bits in any of the four measured count
changes indicates a problem with the MIA function.
16. Return to Section 5.4.3.
A
B