After some research I found a CO detector called the Impulse Pro

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... AQ:US:1123

It cost $79.99 free shipping

I have a PDF manual from Zellweger Analytics

CO measuring range 0-1500PPM, initial alarm set @ 35/100PPM

It is a little bigger than the Pocket CO but it has an easy to see alarm red light.

Zellweger is a Canadian company that designs and makes a broad line of products. if you would like a copy of the manual PM me your email and I will forward the PDF.

Sojorrn wrote:After some research I found a CO detector called the Impulse Pro

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... AQ:US:1123

It cost $79.99 free shipping

I have a PDF manual from Zellweger Analytics

CO measuring range 0-1500PPM, initial alarm set @ 35/100PPM

It is a little bigger than the Pocket CO but it has an easy to see alarm red light.

Zellweger is a Canadian company that designs and makes a broad line of products. if you would like a copy of the manual PM me your email and I will forward the PDF.

I bought and tested the above Impulse Pro and happy to report that placing the device near the exhaust of my car it set the 2 alarms off noise and red light flashing. I placed it in the cockpit and flew around with no heat and it read 0- PPM. Then I turned on the cabin heat both vents and it still read 0- PPM. So if you desire the warm and fuzzies without CO the Impulse Pro works.

I am going to have to give one of these a try. Almost lost a perfectly good wife awhile back and the little dot never turned.

I didn't have one in the back though and she was in pretty bad shape by the time we got on the ground.

The complete exhaust system only had 600 hours on it, I replaced it all and now I dont get headaches any more after a three hour flight. Which I did from day one in this airplane.

I wonder how many of us rely on the dot falsely thinking we were safe.

Jr.CubBuilder wrote:I think you are missing a point mr scout. The dot and any other of the alarms talked about here only sample the air where they are sitting.

I dont think I missed it, I totally agree, with the dot type there is no way of knowing where to even put it.

By being able to sample air at various places then I will know where to put the dots.

Jr cub I think it was your story? that got me to search for the Impulse Pro. However I had not thought about moving the device around in the airplane until now. I was thinking I would wear it on my vest because the PIC is the one who needs a clear head besides most of the time I fly alone. I practice a lot and it scares non pilots when I try new techniques. Sometimes it scares me My line of thinking was that on cold day with heater on and the windows closed the CO would fill the cabin. If the first alarm goes off at 35PPM and the second at 100PPM it is safe to say there is a problem. Am I wrong in thinking that the most likely culprit is the exhaust coming through the heater vents via the engine cowl? The good news is this device can be placed anywhere. So if you have passengers you could have them wear it to test other areas of the cabin or place the device in an area of concern..

Sojorrn wrote: Am I wrong in thinking that the most likely culprit is the exhaust coming through the heater vents via the engine cowl?

Mine was coming out of the louvers on the side of the cowl and right into the fresh air vents. Building up in the back of the cabin. the leaks were at the riser tubes. After taking it completely apart it was apparent someone had at some point overtightened the clamps.

It seems to be a common problem these stack clamps are suppose to turn by hand, many people tighten them way to tight which elongates the tube and it can no longer seal when it warms up.

Sounds like Murphy & carbon monoxide could be that gremlin that is out to get you. After reading both JRCUB & Mr. Scout's accounts I am more than glad I spent the money on Impulse Pro. Thinking out loud I am going to place the device in different areas on every flight to see if there are any hot spots. Since the manual only states immediate proximity I am assuming sections not bigger than human space. The device was made to be worn from the Mfg's perspective. Maybe I'll divide up my POH drawing for Wt & Bal, section by number and then check in rotation.
Thanks for the inputs ! good thread.

About 4 eeks ago I noticed my Impulse PRO Carbon monoxide detector was reading 3 - 7 PPM rather than the usual zero PPM. My annual began about 2 weeks later so I made certain that we take a look at the muffler. I new from the last oil change that the heat shield on the mufflers were cracked at the corners and bought replacements. So I made a point of inspecting the mufflers closely for cracks. Good thing I did because my young eagle eyed A & P found the right muffler exhibited 2 cracks where the exhaust pipe is welded to the muffler. One of the cracks was pronounced when the pipe moved up or down but I really did not see them until we took the muffler off the engine. In addition we found another crack in the left muffler that was beginning to propagate along the muffler near the pipe but here again not easy to see until removed from the engine.
These cracks may have been caught by the A & P without my urging but maybe not. At any rate I wanted to share how this product gave me a deviation from the norm before the 30PPM warning alarm. I would say money well spent to catch the odorless killer.