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PICList Thread
'[OT] CO sensors - old thread, new source'
1998\01\06@100601 by Harrison Cooper

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awhile back, there was some discussion. I was going thru old
magazines and found Motorola makes a MGS1100 CO sensor.
Just  FYI is all.

1998\01\06@122106 by DREITEK

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In a message dated 98-01-06 10:18:34 EST, you write:

<<
awhile back, there was some discussion. I was going thru old
magazines and found Motorola makes a MGS1100 CO sensor.
Just  FYI is all. >>

My 2cents worth,
I contacted Motorolla and they told me that they were getting out of the
chemical sensor business.  They told me they have discontinued all current and
future products in this field.

Dave Duley

1998\01\06@173729 by Andrew Crane

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How did I get on this list and can someone take me off please? I have no
idea what a PIC programmer is and don't really have a use for one. Please
don't tell me how to unsubscribe -- just do it please -- someone.

Thanks and a happy new year
Andrew







On Tue, 6 Jan 1998, DREITEK wrote:

{Quote hidden}

1998\01\06@204044 by richard skinner

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Do know of any other Gas Sensor Companies?  I'm also looking for
readily available O2, CO, NO, NO2 Sensors,  4-20 ma or mv output.

Thanks
Richard Skinner
spam_OUTrwskinnerTakeThisOuTspamworldnet.att.net

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{Quote hidden}

and
> future products in this field.
>
> Dave Duley

1998\01\06@233932 by John Griessen

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richard skinner wrote:

> Do know of any other Gas Sensor Companies?  I'm also looking for
> readily available O2, CO, NO, NO2 Sensors,  4-20 ma or mv output.

I'd like to know who makes the automotive oxygen sensors because I have an
application in mind of controlling the atmosphere in a kiln as well as the
temperature to get better repeatability in firing color glazed pottery.  An
oxygen or CO sensor designed for operation in a combustion zone is what I want.

John Griessen
Austin TX
.....john_gKILLspamspam.....cibolo.com

1998\01\07@001616 by richard skinner

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Napa sells O2 Sensors -  A common one is the 1 volt model  OS100
Which most of the older GM's Used.  Its output is .20 volts  to 1.0 volts
Normally,  .80 to .85  depending on the application and conditions.
They have single lead, two lead, three lead sensor in stock.

I just bought a few of the OS100 's  for 18.95 each.


On the other hand, I'm looking for o2 sensors  that go from 0% to
25% or so, ofcourse it will be spanned for 20.9

The ones I have been using are $150 each, and have an output of
.0315 @ 21% O2.   This is not bad, but the price is High, its has
cheap construction and short life, and hard to get.  I found one I really
like but they will not sell it to me unless I send the meter in for repair.
It has a real dependable, accurate, long life cell for 75.00  I snatched
one from a meter and used in my setup with great success, but the manufactor
sent my meter back and said they had to have the old cell in order to give me

a new one.  These people are so paranoid its unreal.  They won't even sell
parts
unless you ship it back to them (not warranty).    Reverse engineering was
simple.
They used a small op amp, a adjustable voltage ref to a 7106cpl then to the
led's
Even though they tried to buff off all the part numbers,  just take a damp
cloth
and wipe the chip and the part numbers show back up  (neat trick).  The 10k
Multiturn pot adjust gain for calibration.  Mine was the same exact setup
before
I ever seen theirs.


Richard Skinner
EraseMErwskinnerspam_OUTspamTakeThisOuTworldnet.att.net

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{Quote hidden}

want.
>
> John Griessen
> Austin TX
> KILLspamjohn_gKILLspamspamcibolo.com

1998\01\07@092226 by Tom Rogers

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Try the air battery O2 sensor from Figaro. It's about $75, has a relatively
high level output, it's stable and has a good long life.

--Tom Rogers  VP-R&D  Time Tech Inc.

{Original Message removed}

1998\01\07@121606 by Ray Gardiner

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>Do know of any other Gas Sensor Companies?  I'm also looking for
>readily available O2, CO, NO, NO2 Sensors,  4-20 ma or mv output.
>

I found a good site at,  http://205.247.156.2/ they have a section on
gas sensors. Plus lots of other good info.

I am starting work on an application that requires a low cost O2
sensor, and I was thinking along the lines of trying to build a custom
paramagnetic O2 sensor. Does anyone have any experience with these?





Ray Gardiner  Technical Director DSP Systems   RemoveMErayTakeThisOuTspamdsp-systems.com
private email to:- spamBeGonerayspamBeGonespamnetspace.net.au  http://www.dsp-systems.com

1998\01\07@135424 by DREITEK

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In a message dated 98-01-06 21:15:27 EST, you write:

<<
Do know of any other Gas Sensor Companies?  I'm also looking for
readily available O2, CO, NO, NO2 Sensors,  4-20 ma or mv output.

Thanks
Richard Skinner
TakeThisOuTrwskinnerEraseMEspamspam_OUTworldnet.att.net >>

Hello Richard,
No I don't have any other sources.  I am currently looking for a Hydrocarbon
detector.  I am trying to build a Pic controlled meter that will warn of an
explosive concentration of solvents in the atmosphere inside our machine.  I
dug one sensor out of a hand held unit I bought.  The sensor is made of a
small heater that warms a conductive polymer.  When the sensor is exposed to
Hydrocarbons, the polymer swells changing its conductivity.

Anyway if anyone else has a URL or two I would be interested.

David Duley
http://www.dreitek.com

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