Mindray A7 Service Manual

Functional Tests Periodic Maintenance
3 - 24 046-006272-00 A7™ Service Manual
3.8.6 Check the Sensor Zero Point
To check the sensor zero point:
1. Turn off all fresh gases and expose the breathing system to ambient pressure.
2. Make sure that the system is in Standby mode.
3. Select Setup-> Service-> Data Monitors-> Component-> Zero Sensor to access the following
menu.
FIGURE 3-26 Data Monitors Menu
4. The second column is the current reading of the sensors and the third column is the zero that is
saved in the EEPROM.
The following table lists the normal range of the zero point of the A7 pressure and flow sensors.
• For pressure and fow sensors: If there is a great deviation (> 200 AD Counts) between the current
zero point and the saved zero point, it indicates that the sensor is aging but it does not mean that
normal measurement cannot be performed. The sensor will need to be recalibrated.
If the zero point of the flow sensor is not within 0 to 2000 and the zero point of the pressure
sensor is not within 0 to 1200, the Ventilator Control Board needs to be replaced.
• For the flowmeter sensors (N2O, Air, O2): If the zero point is out of the normal range [-0.2,
+0.2], it
indicates that the sensor needs to be recalibrated
Sensor Name Normal Range of Zero Point
Paw sensor 200 to 800 AD Counts
PEEP pressure sensor 200 to 800 AD Counts
Inspiratory flow sensor 50 to 1800 AD Counts
Expiratory flow sensor 50 to 1800 AD Counts
Ventilator internal flow sensor 100 to 400 AD Counts
N2O Flow Sensor(EFCS) -0.2 to +0.2 L/min
Air Flow Sensor(EFCS) -0.2 to +0.2 L/min
O2 Flow Sensor(EFCS) -0.2 to +0.2 L/min

Mindray A7 Specifications

General

Brand	Mindray
Model	A7
Category	Medical Equipment
Language	English