
Title: 8500 Adjustment & Calibration
Document No: 129AC000
Sheet 6 of 12
BLEASE QUALITY DOCUMENT
BQD 083.V2
25/5/94
Adjust RV1 on the Interface board for 0V +/-10mV at PFZ test pin.
Press Space Bar to save.
Press Ctrl+U to save zeros.
Leak Test and Absorber Switching
Absorber switching
The function of this will have been checked during compliance compensation and the
presence of an absorber will have been displayed
.
Fresh gas leak test
Connect spirometry tubing 10110089 from TJ92 to the fresh gas connections on the rear of the
ventilator. Each side of the circuit is checked by pressurising it to 80 mmHg and checking that
the pressure is maintained.
Patient Flow transducer leak test
Connect spirometry tubing 10110089 from TJ92 to the patient connections on the rear of the
ventilator. Each side of the circuit is checked by pressurising it to 80 mmHg and checking that
the pressure is maintained.
Drive Flow Sensor Leak Test
Note: to run the Blease Medical Test I/O Diagnostics connect the ventilator serial cable between
the recorder output connector on the back panel of the 8500 & a PC. Run Hyper Terminal on the
PC using the stored 8500 HT settings file.
Press
CTRL+E
on the PC followed by the up cursor key. Page through the diagnostics using the
TAB key & scroll through using the UP/DOWN cursor keys.
Tee in to the drive gas outlet the pressure monitor and then block the flow sensor outlet.
Select
Blow off valve ref. pressure
. With the flow sensor outlet blocked the internal pressure
will build up until the Blow off valve operates.
Using an oscilloscope monitor the voltage at test point DF on the BAV Interface Board
10110099 this voltage will remain stable whilst the monitored pressure is stable if there are no
leaks.
Once this test is complete restart the ventilator by pressing CTRL + E.
Run the ventilator for 3 hours on default settings, but with BPM set to 30.