3-2                    BeneVision N22/BeneVision N19 Patient Monitor Service Manual 
 
3.1.3 Recommended Frequency 
 
Check/Maintenance Item  Frequency 
Preventative Maintenance Tests 
Visual inspection  When first installed or reinstalled. 
NIBP tests 
Pressure check 
1. If the user suspects that the measurement is incorrect. 
2. Following any repair or replacement of relevant module. 
3. For NIBP module, at least once every two years; for CO
2
 and AG 
modules, once a year.   
4. AG leakage test should be performed before AG measurement. 
Leakage test 
Sidestream and 
Microstream CO
2
 tests 
Leakage test 
Performance test 
Calibration 
AG tests 
Performance test 
Calibration 
Performance Tests 
ECG tests 
Performance test 
1. If the user suspects that the measurement is incorrect. 
2. Following any repair or replacement of relevant module. 
3. At least once every two years. For CO
2, 
AG and NMT modules, at 
least once a year.   
4. AG leakage test should be performed before AG measurement. 
 
Calibration 
Resp performance test 
SpO
2
 test 
NIBP test 
Pressure check 
Leakage test 
Temp test 
IBP tests 
Performance test 
Pressure calibration 
C.O. test 
Sidestream and 
Microstream CO
2
 tests 
Leakage test 
Performance test 
Calibration 
AG tests 
Leakage test 
Performance test 
Calibration 
EEG test 
BIS test 
CCO/SvO
2 
tests 
Interconnecting function 
Output calibration 
NMT tests 
Performance test 
Sensor check 
Nurse call relay performance test 
If the user suspects that the nurse call or analog output does not 
function properly. 
Analog output performance test