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Date: Fri, 29 Sep 1995 From: Kevin (rmqn56a@pr*.co*) Subject: Re: Oxygen Sensors >>" that you can get at discount at Pep Boys "? >> >>I'll spend the money on a proper sensor, and then be able to >>experience descending, as well as ascending on my next dive. >> >> >What's Pep Boys? >What is a proper sensor? Dear Bill Pilicer (an aspiring guppie): Pep boys is a "discount" auto parts store. They sell "Lambda" sensors which are probably in your car's exhaust system. These little spark- plug look alikes tell your car's computer and or fuel injection system the O2 content in the exhaust. It seems that because these are rudimentary "oxygen sensors" some techs are hypothesizing about using them to measure O2 in their diving gases. The automotive sensors are designed to be crude, rude, operate at very high temperatures and last a long time under rough conditions. They ARE NOT AN ACCEPTABLE REPLACEMENT for your desk top/fill room O2 sensor. Since you mentioned "aspiring guppie", assume the following scenario. You are planning some dive to about 100 or 110 feet max. You mix your primary gas to NOAA II (36%). You want some bottom time. If you calibrate your O2 sensor to 21% (room air - forget about moisture etc. ) and then measure your gas, it comes out 36%. GREAT. But lets say you tried to save some money and your O2 sensor is from Pep Boys (!!!!!!!), and is off 4 to 5 % too rich, you are screwed big time. The bends suck but O2 convulsions at depth will cause you to miss out on your next birthday party. This is why I thought it important to add my two cents to this strange thread on how to save money on O2 sensors. Kevin
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