7 Troubleshooting
1505-1018-000 08/07
7-3
4.
Paw insp
and
Paw exp
are not within 4 cmH
2
O when pressurized to
34 cm H
2
O.
Test results indicate
Fail
but no alarm message is displayed.
• Use EC Service Application PC based (Section 8.5) to facilitate problem
isolation.
• Use the Service Application to calibrate sensors (Section 5.2.8).
• Replace the affected Sensor board(s) or Zero valves, if calibration fails.
If this check fails, all ventilation modes will still be available.
7.1.2 Barometric
pressure test
A failure indicates that the difference between calculated barometric
pressure based on the input altitude, and the measured barometric pressure
is greater than 20%.
• Verify correct altitude setting.
• If setting is correct, calibrate the barometric sensor (Section 8.7.4).
• Replace the Vent Monitor board (VMB) - recalibrate barometric sensor.
If this check fails, all ventilator modes will still be available and the
calculations will use the input altitude as basis for absolute pressure.
7.1.3 Low pressure leak
and compliance check
If there are errors in the calculation (negative values, divide by zero) the
results will be dashed. The results of this calculation will be displayed after the
Safety Relief Valve test is completed.
1. The first calculation is compliance and is based on the amount of time it
takes for a 3 lpm flow to create 34 cmH
2
O of pressure at the Pexp sensor.
If this pressure cannot be achieved, a "Failed" message will appear and
no compliance information will be available.
2. The second calculation is the low pressure leak rate. It is based on the
amount of pressure decay from 25 cmH
2
O pressure in approximately 3
seconds.
• If the leak rate is greater than 1 lpm (@ 25 cmH
2
O), the compliance value
will be dashed and the leak value will show "> 1000 ml/min." This value
can be useful in diagnosing other failures during checkout.
• If the Leak is greater than or equal to 500 ml/min or Compliance cannot
be measured or Resistance cannot be measured, the "Failed" message
will apear across from Circuit Check.
• If the the Leak is less than 500 ml/min and Compliance and Resistance
can be measured, a message will be displayed.
3. Finally, a correction based on the leak rate is applied to the compliance
calculation and the information will be displayed.
Summary of Contents for Engstrom Carestation
Page 1: ...Engström Carestation Technical Reference Manual ...
Page 12: ...Engström Carestation x 08 07 1505 1018 000 ...
Page 52: ...Engström Carestation 2 26 08 07 1505 1018 000 ...
Page 100: ...Engström Carestation 5 26 08 07 1505 1018 000 ...
Page 124: ...Engström Carestation 7 16 08 07 1505 1018 000 ...
Page 188: ...Engström Carestation 8 26 08 07 1505 1018 000 ...
