Mindray A5 Service Manual

A5/A3™ Service Manual 046-001141-00 5 - 51
Repair and Troubleshooting Pneumatic Circuit System Problems
5.3.4.1 Leak Test of Flow Sensor Pressure Sampling Pipeline
If the flow waveform is displayed irregularly, the flow sensor pressure sampling pipeline may be leaky.
Perform the leak test by using the following tools:
• Anesthesia machine calibration device (quantity:1)
• Flow sensor pressure sampling pipeline test fixture (quantity:1)
• Circuit adapter test fixture (quantity:1)
• Injector (quantity:1)
• Ø6 silicone tube (quantity:3)
• Y piece (quantity:1)
Test procedures:
O2 concentration
measurement fails
or has great
deviations.
There is water built up on the
measurement surface of O2 sensor.
Remove the built-up water and allow the
O2 sensor to air dry.
The O2 sensor is not calibrated.
Calibrate the O2 sensor as per section
4.3.1 O2 Sensor Calibration.
The O2 sensor is damaged. Replace the O2 sensor.
The airway
pressure gauge
shows inaccurate
reading or its
pointer cannot
move.
The airway pressure gauge is damaged. Replace the airway pressure gauge.
The flow wave is
displayed
irregularly.
The flow sensor assembly is not installed
properly.
Re-install the flow sensor assembly.
There is water built up inside the flow
sensor assembly.
Remove the flow sensor assembly and
clear its inside water build-up.
The membrane of the flow sensor
assembly is distorted, dirty or its inside
resistance changes. Zero drift occurs to
the pressure sensor of the fresh flow
sensor board.
Enter the service mode and calibrate the
flow sensor as per the procedures
described in ‘‘If measurement deviations
are not corrected after multiple flow
sensor calibrations, the user is
recommended to replace the flow sensor
and then perform calibration. If the
problem persists, factory maintenance is
necessary.’’ on page 4-18.
The flow sensor is damaged. Replace the flow sensor assembly.
The pressure sensor on the fresh flow
sensor board is defective.
Replace the fresh flow sensor board.
The flow sensor pressure sampling
pipeline leaks.
Repair the flow sensor pressure sampling
pipeline after checking as per the
procedures described in “Leak Test of
Flow Sensor Pressure Sampling Pipeline”
on page 5-51.
Failure
description Possible cause Recommended action

Mindray A5 Specifications

General

Type	Anesthesia Machine
Brand	Mindray
Model	A5
Power Supply	100-240 V AC, 50/60 Hz
Ventilation Modes	SIMV, PSV
Flowmeters	O2, N2O, Air
Vaporizer Capacity	Up to 3 vaporizers
Safety Features	O2 failure protection, low pressure alarm
Gas Module	Optional integrated gas module
Integrated Air Compressor	Optional
Patient Monitoring	Integrated monitoring with optional modules