My 5 cents for longer O2 sensor live

Mike_Eitel · 15th January 2008, 15:20

Hi guys.

Wanted to share my expirience:

The O2 sensors are very sensitive to reverse current.

Everybody sees OP's as high resistance devices with towards zero input currents. But that is only true after they are stabilised .... BUT when you switch on power supply the OP can generate a transient current also between this two inputs. ....

This reverse current is higher than the sensor generated and will damage the sensor a bit. The transient is only short and the sensor is going to "recover". I think the slowly, visible "stabilizing " of the measured value could be a good hint for such an recovering process. So what did I do ... Two diodes on the output of the first amplifier.

See shema and more text Mike Eitel hobbies start frame . Use left menue and O2 Chamber

I do NOT guarantee NOR take any responsability that I found the " philosopher's stone " but at least I have less problems since I modified my gauges. ( > 1 year )

Save diving from cold Switzerland
Mike

***caveseeker7*** · 15th January 2008, 17:46

Hi Mike,

just had a look at your website, some impressive stuff you've done there. You really should upload the 3/4 front uw shot of you and the V2 beast as your profile picture.

Not far behind the SMS2000 from Dräger.

Have some reading to do, hope you enjoy Rebreather World.
You'll find a bunch of like-minded builders here.

15th January 2008, 15:20	#1 (permalink)
Mike_Eitel New Member Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: Switzerland Posts: 5	My 5 cents for longer O2 sensor live Hi guys. Wanted to share my expirience: The O2 sensors are very sensitive to reverse current. Everybody sees OP's as high resistance devices with towards zero input currents. But that is only true after they are stabilised .... BUT when you switch on power supply the OP can generate a transient current also between this two inputs. .... This reverse current is higher than the sensor generated and will damage the sensor a bit. The transient is only short and the sensor is going to "recover". I think the slowly, visible "stabilizing " of the measured value could be a good hint for such an recovering process. So what did I do ... Two diodes on the output of the first amplifier. See shema and more text Mike Eitel hobbies start frame . Use left menue and O2 Chamber I do NOT guarantee NOR take any responsability that I found the " philosopher's stone " but at least I have less problems since I modified my gauges. ( > 1 year ) Save diving from cold Switzerland Mike
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15th January 2008, 17:46	#2 (permalink)
*caveseeker7* Who loves ya, baby Current Rebreather/s: Sport Kiss Other Rebreather/s: Prism Topaz Join Date: Jan 2005 Location: Too far from Neverland Posts: 5,280	Re: Hi Mike, just had a look at your website, some impressive stuff you've done there. You really should upload the 3/4 front uw shot of you and the V2 beast as your profile picture. Not far behind the SMS2000 from Dräger. Have some reading to do, hope you enjoy Rebreather World. You'll find a bunch of like-minded builders here. __________________ Cheers Stefan Be Water, My Friend - Bruce Lee Sponsor Lou in Race For Life!
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