EBME Forums Forums Maintenance Technical Assistance Oxygen sensors

Hi friends,

Can anybody tell which type of oxygen sensor is using in ventilator, model 'Savina' from Draeger. There are two cells and are not electrochemical sensors. Is it paramagnetic?
And which type is the best/more accurate for oxygen measurement?

Shymasajeev

They are an electrochemical fuel cell!
They also have an EPROM for serial number & stored calibration data for each cell.
One cell is the display value the second is the monitor cell. They must agree within 2%
Deviation > 2% will automatically force a recalibration @ 100% O2.

Hi PGD,

Can you tell me the expected life span of these cells? usually electrochemical fuel cells needs periodic replacement, am I right?

Shymasajeev

Shyma, can I direct you to:-
http://www.btinternet.com/~madmole/DiverMole/DMCells.htm

It's a diving site, but the information is still worth taking a look at, I think.

Thanks Hannis,that was a good information.

Drager Savina ventilator have 2 Oxygen sensor Oxytrace VE sensor p/n MX 01049, both are interchangeable each other.
one S3.2 monitoring oxygen on inspiration blok and have other function doing calibration of 21% oxygen,
the second sensor S3.1 located on the O2 valve block of mixer for calibrating 100% oxygen.
Those both O2 sensor are using DC power which draw a continuous current 2~3 mA for each cell in order to maintance their measurement ability.
So why if you Savina not in use for long times you have to plug the power cord to the mains or remove the DC fuse on rear control panel to avoid completed battery discharge.
If you not to do above 2 option your Savina will have alarm 'No internal battery' beep anytime coz the power supply cant charge the battery under the charge voltage.
Both O2 cell life time is much longer than normal electrochemical O2 sensor, normally life time is 3 years or more.