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6.3.5.3 Calibration Procedure 
Automatic Calibration 
Perform the following steps to calibrate the pressure sensor and PEEP proportional valve. 
1.    Ensure that the anesthesia machine is in standby mode. 
2.    Select Setup > Service > Calibrate > Pressure Sensor and select Automatic Calibrate to 
access the screen shown below. 
 
3.    Use a communication cable to connect the calibration device and the anesthesia machine 
according to the instructions on the screen. Connect the pressure sampling line to the 
calibration device according to steps 2 and 4. Details are shown below: 
VT Plus setup: 
When VT Plus is used as the calibration device, perform the following operations on it (note: 
verify the correctness of the settings before each calibration): 
1)  Zero Mode: Manual 
  Select SETUP > Settings > ENTER and set Zero Mode to Manual. 
2)  Serial Mode: OTIS Ctrl 
  Select SETUP > System > ENTER and select Serial Mode: OTIS Ctrl. 
  Note: Set Serial Mode before calibration. Exit the Serial Mode setup screen before you 
access the (flow or pressure) measurement screen. To exit the Serial Mode setup screen, 
Select SETUP > System > ENTER and select Serial Mode: NONE. 
VT 650/900 setup : 
When VT 650/900 is used as the calibration device, perform the following operations on it (note: 
verify the correctness of the settings before each calibration): 
  Select Menu > Unit > Low Pressure, select cmH2O, and select OK.