Blease 8500 - Page 20

Title: 8500 Adjustment & Calibration Document No: 129AC000 Sheet 8 of 12
BLEASE QUALITY DOCUMENT
BQD 083.V2
25/5/94
4.10 Pressure Sensor Gain
Wind both pots fully anti-clockwise on PEEP control board.
Select Blow off valve ref. Pressure. Set a flow of 1 LPM, the flow rate can be adjusted using
the Tidal Volume control.
Tee in to the drive gas outlet the pressure monitor and then block the flow sensor outlet. With
the flow sensor outlet blocked the internal pressure will build up until the Blow off valve
operates. The pressure will then stabilise at this point, shown on the pressure monitor, this
should be 75 ± 3 cmH
2
O.
If the reading is other then 75 +/- 3 cmH
2
O then adjust the valve.
Select Patient airway pressure gain.
When measured patient airway pressure reaches set value press the Space bar to set gain value.
Select Drive gas pressure gain.
When measured patient airway pressure reaches set value press the Space bar to set gain value.
Press Ctrl+U to save values.
4.11 Delivered TV Calibration
With the flow sensor connected to the test lung (C20 compliance & R20 resistance) via the high
flow port on the monitor, check the default values are set to; TV =500ml, rate = 12 BPM and
Ratio 1:2.0.
Change mode from cal. standby to cal. mode. By pressing STBY/ON switch.
Select Flow gas pressure gain for a delivered output volume of 470ml TV. Adjust the tidal
volume setting until 470ml is monitored, on the external monitor, not the 8500.
Press space bar to save.
Press Ctrl+U to save values.
Select patient flow inspired gain for a delivered output volume of 500ml TV. Adjust the tidal
volume setting until 500ml is monitored, on the external monitor, not the 8500.
Press space bar to save.
DO NOT move the cursor from patient flow inspired gain until the displayed EtidalV value HAS
GONE RED (on third breath) then returned to black.
Select patient flow expired gain, press space bar to set.
Press Ctrl+U to save values.
Change mode from cal. mode to cal. Standby, using STBY key.
4.12 Hardware Pressure Overload Backup
Put the ventilator in cal mode standby. All settings should be at default. Move the cursor to
Sensor Calibration at the top of diagnostics page 1.
With a C5 compliance connected to the drive gas outlet. Put the ventilator into run mode and