4-19 
4 Electronic 
flowmeter 
calibration 
(factory)  
 
Calibrate the electronic 
flowmeter board. 
1. The electronic flowmeter board is 
replaced. 
2. The throttling device of the electronic 
flowmeter is replaced. 
3. The deviation between the measured 
value of the electronic flowmeter and that 
of the standard flow measurement device 
exceeds more than 10% of the reading or 
0.5 L/min, whichever is greater. 
5  Pressure and flow 
zeroing (factory) 
Calibrate the deviation 
from zero point of the 
monitor board and 
auxiliary monitor board.
Flow or Paw waveforms deviates from the 
baseline. 
6 Electronic 
flowmeter zeroing 
(factory) 
Calibrate the deviation 
from zero point of the 
electronic flowmeter 
board. 
The electronic flowmeter has a zero point 
error. The electronic flowmeter still 
displays flow when fresh gases are all 
turned off. 
7 O2 sensor 
calibration (user) 
Calibrate the accuracy of 
O2 sensor at 21% and 
100% O2. 
1. The measured value of the O2 sensor 
has a great deviation. The deviation 
exceeds 3% both in Air and pure O2. 
2. The O2 sensor is replaced. 
3. The monitor board is replaced. 
8 CO2 calibration 
(factory) 
Calibrate to cause the 
module to work more 
accurately. 
The measurement deviation of the module 
exceeds the specified accuracy range. 
9 AG calibration 
(factory) 
Calibrate to cause the 
module to work more 
accurately. 
The measurement deviation of the module 
exceeds the specified accuracy range. 
10 O2 module 
calibration 
(factory) 
Calibrate to cause the 
module to work more 
accurately. 
1. The measurement deviation of the 
module exceeds the specified accuracy 
range. 
2. The O2 module is replaced. 
 
Select the [Maintenance] shortcut key → [Factory Maintenance >>]. Enter the required 
password to access the [Factory Maintenance] menu, where you can perform the following 
calibrations and settings.