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4.3.5.2 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 4.2.4Check 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 monitor board is faulty. Replace the monitor board.
4. If zero points of the sensors are correct but zeroing is still failed, the three-way valve
assembly is faulty. Replace the three-way valve assembly.
4.3.6 Electronic Flowmeter Zeroing (factory)
After the gas supply is disconnected, if the pointer of the pressure gauge returns to zero but
the electronic flowmeter still displays flow, it is possible that zero offset occurs to the
electronic flowmeter’s sensor. Generally, you can zero the flowmeter manually to eliminate
the measurement deviation caused by zero offset immediately.
4.3.6.1 Zeroing Procedures
1. Select the [Maintenance] shortcut key → [Factory Maintenance >>] → enter the
required password → [Factory Cal. >>] → [Flowmeter Zero Cal. >>]. The message
[Zeroing] is prompted.
2. If flowmeter zeroing is passed, the message [Zeroing Completed!] is displayed. If
flowmeter zeroing is failed, the message [Zeroing Failure! Please try again.] is
displayed.
NOTE
z In case of zeroing failure, other faults may exist. You must isolate and eliminate the
problem.
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