Mindray A7 Operating Instructions

Water Build-up in the Flow Sensor Maintenance
7 - 6 046-004667-00 A7™ Operating Instructions
7.6 Water Build-up in the Flow Sensor
7.6.1 Prevent Water Build-up
Water comes from the condensation of exhaled gas and a chemical reaction between CO
2
and the
soda lime in the CO
2
absorbent canister. At lower fresh gas flows more water builds up because of
the following:
• Less gas in the breathing system is removed through AGSS and gets replaced with fresh gas.
•More CO
2
stays in the CO
2
absorbent canister to react and produce water.
• More moist, exhaled gas stays in the breathing system and CO
2
absorbent canister to
produce condensed water.
Check the inspiratory and expiratory flow sensors when abnormal flow waveform or unstable tidal
volume fluctuation is detected. Check the sensor for water. If there is water build-up, clear it
immediately before use.
To prevent water build-up:
• Use a filter between the flow sensor and the patient to limit water condensation in the flow
sensor.
• Check the water trap for water before using the A7 Anesthesia System. If there is water build-
up, clear it immediately.
7.6.2 Clear Water Build-up
Water build-up inside the flow sensor results in inaccurate measured value of tidal volume. If there is
water built up inside the flow sensor, remove the sensor and clear the water, then reinstall the sensor
for use.
WARNING: Check water build-up inside the flow sensor before every system use.
Accumulated water in the flow sensor causes erroneous readings.
WARNING: Ensure that all breathing system parts are completely dried after the
breathing system is cleaned and disinfected.

Mindray A7 Specifications

General

Type	Anesthesia Workstation
Brand	Mindray
Model	A7
Display	15-inch color touchscreen
Oxygen Flush	Yes
Gas Inlets	O2, N2O, Air
Ventilation Modes	SIMV, PSV
Breathing System	Integrated
Gas Monitoring	O2, CO2, N2O
Monitoring Parameters	FiO2
CO2 Monitoring	Mainstream or Sidestream
Power Supply	100-240 V, 50/60 Hz