MSA Fivestar personal gas alarm teardown

[simontay1984]

So why was some of the display not working? Was it because some of those diodes had gone open or was there one of those rubber things to connect the LCD.

[mikeselectricstuff]

@simontay1984 Glass was cracked

[avoed1973]

haha great ending 

[igsaturation]

The ending is hilarous, thank you!

[igsaturation]

Excellent, explains very well Ex. An Ex rated Fluke 87V is near $900 versus $300 for the regular 87V. Helps justify all the cost given its all under the hood.

[mikeselectricstuff]

@igsaturation Most of that cost is because it's a low volume product, plus approvals costs - I doubt the the actual build cost of an IS fluke 87 is much more than the normal one.

[Malithion2001]

Loved the ending!

[MrGerbilBrain]

Nice! always interesting to see teardowns of unusual stuff!

[scottyleics]

I love your teardowns! Keep them coming. :)

[parp12345]

At 24:13 it looks like removing cotton wool from a wound.

[commodork]

Nice use of a fragment of video from the PEPCON disaster!

[pigpenthegreat]

What's this? Another Video? How very generous of you Sir! Keep them coming :)

[Gameboygenius]

Mike, out of curiosity, for any given episode, how much of the facts presented that are specific to do the thing being torn down, do you know by heart, and how much do you find during research for that episode? Say something like coating being fluorescent or the specifics of safety standards to take a couple of examples from this episode.

[mikeselectricstuff]

@Gameboygenius Specific stuff is usually from docs I found online, & I say when this is the case. Apart from looking up unfamiliar IC numbers, the rest is generally stuff I already know from experience - e.g. a few years ago I was involved in design of some intrinsically safe products.

[shogoonn]

Most (if not all) gas sensors are sensitive to partial gas pressure (concentration * absolute pressure), that's what the pressure sensor is for. It measures the absolute pressure, so you can get concentration readings.

[OK2BCK]

thanks Mike!

[superdau]

I get goosebumps when I see you taking stuff apart! And it's only in part due to the scalpel you're waving around. Mostly it's because I want to tear such interesting things apart myself (I only get consumer electronics)! But without the information you give, I'd miss half of the interesting stuff.

Btw. looked it up: O2 and CO sensors are a kind of fuel cell. The O2 sensor contains KCl as electrolyte (not that bad), but the CO sensor has some H2SO4 in it. Don't want to get that on your hands.

[im2geek4you]

Excellent video, keep them up!

[Serostern]

Wooooow, that sucker is well built!

[MrTurboturbine]

i'd like to see a Chinese made unit

[parp12345]

@MrTurboturbine Yeah that should be interesting.

[ntjbjhq]

LOL, very nice review as always, and great ending :)

[orbiter8]

Very interesting again Mike, Thanks. Love the ending :)

[EnergeticAdvantage]

Nice intrinsically safe battery mod!

[TheCrazyInventor]

Whahaha, "I've pulled the oxygen sensor out because it was giving me continuous alarms"... That's one way of dealing with a hazardous situation. :D

Anyway, good video. Interesting to see all the safety precautions they've taken while designing this device.

Oh... And please don't use a scalpel as a pointing device anymore... My face was like THIS close when you where waving that around. Makes me nervous.

[TheCrazyInventor]

@TheCrazyInventor Awesome ending, once again... Forgot about that one. :)