CALIBRATION / OPERATIONAL VERIFICATION PROEDURE
5-6 SERHT50NA A0808
PRESSURE RELIEF VALVE CALIBRATION
1. Use the Int. Battery button to scroll to “Adjust Rel Valve.”
2. Block the Mainflow outlet using CAP100P, and press the ▲Up
control b
utton. This will start the motor and pressure in the
system will begin to rise.
3. Verify there is no air leaking from the exhalation valve. All air
leakage must be from the pressure relief valve.
If no leakage is noted, proceed to step 4. If leakage is noted,
you will need to pressurize the exhalation valve from an
external source. While the motor continues to run, perform the
following:
• Disconnect the exhalation valve tubing from the EXH.VALVE
connector on the ventilator.
• Connect this same tubing to the Luer connector on the 20 cc
syringe.
• Pressurize the exhalation valve diaphragm by pushing on the
syringe plunger until the leakage from the exhalation valve
ceases.
4. The Message Display will indicate the circuit pressure. Verify
that the displayed pressure is 110 ±10.
5. If the pressure is outside this limit, use a Phillips screwdriver to
adjust the pressure by turning the pressure relief screw located
on the underside of the Mainflow Outlet Assembly.
6. After verifying that the Message Display Window is showing 110
±10, unblock the outlet of the Rp50, and press the Int. Battery
button.
NOTE: If the 20 cc syringe was used, remove it now and reconnect
the exhalation v
alve tubing to the exhalation valve connector.
7. To exit Tech. Setup and USER SETUP, press the Silence/Reset
button twice.
NOTE: If the pressure relief valve is adjusted, perform Pressure
T
ransducers Calibration and Volume Factor Calibration again.
EXHALATION VALVE CALIBRATION
WARNING Each time an exhalation valve is replaced it must
be calibrated.
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