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Microcap & Penny Stocks : DCH Technologies (DCH) -- Ignore unavailable to you. Want to Upgrade?

To: Sid Turtlman who wrote (307)	1/13/1999 8:41:00 PM
From: Tom Swift	Respond to of 2513

Dr. Harvey: Since you cited an article about hydrogen pumps, let me ask you: do they need hydrogen sensors, such as DCHT makes? How much do each of these things cost? What do they actually do - beep when there is hydrogen around? Why does anyone actually need them? Thanks, and thanks for writing about DCHT on the DCHT thread, as opposed to everywhere else under the sun. I second the thanks -- let's keep the DCHT discussion here. Hydrogen sensors are commonly used wherever hydrogen is around to monitor for leaks. There is company called Figaro that makes the most widespread sensor (~$25 ea.). This is (as I recall) based on a hot-wire and a resistance bridge. The sensors are about the size of the tip of your thumb and require a printed circuit card to run them. There is also a hydrogen flame detector that NASA has developed and is regularly flogged in trade mags and "NASA Tech Briefs". This is based on detecting the UV light from hydrogen flames. I have looked at DCHT's website & it is not obvious to me how the DCHT sensor works. Do you have any pointers, Dr. Harvey?

To: Sid Turtlman who wrote (307)	1/14/1999 5:23:00 AM
From: Dr. Harvey	Respond to of 2513

Sid, I will get back to the thread with the correct answers to those questions. Meanwhile, i found this on another thread. home.earthlink.net

To: Sid Turtlman who wrote (307)	1/14/1999 11:13:00 PM
From: D VanSwol	Read Replies (1) \| Respond to of 2513

>>Dr. Harvey: Since you cited an article about hydrogen pumps, let me ask you: do they need hydrogen sensors, such as DCHT makes? How much do each of these things cost? What do they actually do - beep when there is hydrogen around? Why does anyone actually need them?<< Hydrogen burns with an almost invisible flame and is extremely explosive if the gas were to accumulate before igniting. You may have noticed that during space shuttle launches NASA has a bunch of "sparklers" going off near the engine nozzles on the launch pad. These "sparklers" are supposed to ignite any leaking hydrogen before it can accumulate rather than have the shuttle engines ignite the accumulated gas when they startup, causing an explosion on the pad. --Dennis--