A7™ Service Manual 046-006272-00 4 - 49
Calibration System Calibration
4.3.4.2 Troubleshoot Pressure and Flow Zeroing Failure
In case of zeroing failure, troubleshoot as follows:
1. Set the anesthesia machine to manual ventilation or standby mode. Turn off fresh gas. Unplug
the breathing tubes in the breathing system, causing the inspiration and expiration connectors
to open to the air. Bleed the residual gas inside the bellows. Make sure that there is no flow or
pressure entering the flow or pressure sensors inside the machine.
2. Check if the zero points of the sensors are normal by referring to 3.7.3 Check the Sensor Zero
Point.
3. If a zero point error is detected, unplug the sensor sampling line to eliminate the effects caused
by sampling line occlusion or three-way valve. If zero point is still out of the range, the ventilator
control board is faulty. Replace the ventilator control board.
4. If zero points of the sensors are correct but zeroing is still failed, the solenoid valve assembly is
faulty. Replace the solenoid valve assembly.
4.3.5 EFCS Zeroing (User)
After the gas supply is disconnected, zero offset may occur in the sensor of the EFCS if the pointer of
the pressure gauge returns to zero but the EFCS still displays a non-zero flow value. You can zero the
flowmeter manually to immediately eliminate measurement deviations caused by zero offset.
To Next Page
Loading...
Need help?
General
