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'[EE] low cost air pressure sensor'
2007\04\05@115853 by Dwayne Reid

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Good day to all.

Got a new project to work on that requires a low cost air pressure
sensor.  Expected pressure is quite low: 0 to 2" water column.

Anyone have any favorite sensors that work over that low pressure
range?  Single port sensor is fine - I'm measuring pressure relative
to atmosphere (gauge pressure).

I've used Motorola's sensors in past but figure there has to be
others available.

Expected volume is quite low - maybe 1K per year.

Thanks for any suggestions.

dwayne

--
Dwayne Reid   <spam_OUTdwaynerTakeThisOuTspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

Celebrating 22 years of Engineering Innovation (1984 - 2006)
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2007\04\05@133252 by Carl Denk

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I have a MOTOROLA FREESCALE MPX5010G\P1.45 PSI  sensor going to a
18F1320. Like the 5 volt in, and 0 - 5 (I think it's something slightly
less) volt analog out. Easy to connect, 3 little filter caps and you are
there. It's remotely (3 feet away), potted it's port to a 1/4" pipe
thread brass nipple with a hex for the wrench in the middle. Then the
entire (vent port open) thing potted in epoxy with milled fiber glass
filler. If it get exposed to the weather, no big thing. Don't know how
you would connect to the port, piece of plastic tubing and a clamp (I
use other places 2 wraps .035" stainless aircraft safety wire, then
twisted tight).

Check digikey for sensors that have pipe thread port already. And I
thought Jameco had Motorola low pressure at low price, but didn't have
the built in amplifier which would probably mean an OpAmp.

Dwayne Reid wrote:
{Quote hidden}

2007\04\05@170534 by Marcel Duchamp

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Dwayne Reid wrote:
> Good day to all.
>
> Got a new project to work on that requires a low cost air pressure
> sensor.  Expected pressure is quite low: 0 to 2" water column.
>
> Anyone have any favorite sensors that work over that low pressure
> range?  Single port sensor is fine - I'm measuring pressure relative
> to atmosphere (gauge pressure).
>
> I've used Motorola's sensors in past but figure there has to be
> others available.
>
> Expected volume is quite low - maybe 1K per year.
>
> Thanks for any suggestions.
>
> dwayne
>

That's a tough range to find "low cost" parts for.  For your
application, what does "low cost" translate to?

I have been using SDX005IND4 from Sensym but it's
       a) 5" water column
       and
       b) $52 in 100's @ Digikey

Low range air pressure sensors tend to have very poor temperature drift
specs although this can be improved on with characterizing in an oven.


2007\04\07@023535 by Vasile Surducan

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Pitot tubes with two temperature sensors?
http://en.wikipedia.org/wiki/Pitot


On 4/5/07, Dwayne Reid <.....dwaynerKILLspamspam@spam@planet.eon.net> wrote:
{Quote hidden}

> -

2007\04\07@043207 by stef mientki
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Dwayne Reid wrote:
> Good day to all.
>
> Got a new project to work on that requires a low cost air pressure
> sensor.  Expected pressure is quite low: 0 to 2" water column.
>
> Anyone have any favorite sensors that work over that low pressure
> range?  Single port sensor is fine - I'm measuring pressure relative
> to atmosphere (gauge pressure).
>
> I've used Motorola's sensors in past but figure there has to be
> others available.
>
> Expected volume is quite low - maybe 1K per year.
>
> Thanks for any suggestions.
>
> dwayne
>
>  
Maybe you could use "disposable"  pressure transducers,
used in hospitals for measuring bloodpressure (i.e. Baxter).

--
cheers,
Stef Mientki
http://pic.flappie.nl

2007\04\08@044736 by Vasile Surducan

face picon face
The Smartec pressure sensors costs about $5/pcs and are available in
0-0.35 bar, 0-1bar, 0-2bar, 0-6.5bar
http://www.smartec.nl/pressure_sensor.htm
hope it helps and those people have representatives in Canada.

On 4/5/07, Dwayne Reid <.....dwaynerKILLspamspam.....planet.eon.net> wrote:
{Quote hidden}

> -

2007\04\09@041116 by Russell McMahon

face
flavicon
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> Got a new project to work on that requires a low cost air pressure
> sensor.  Expected pressure is quite low: 0 to 2" water column.

Does "air pressure sensor" mean is/isn't there or you need to measure
pressure in that range?

For the former (on/off) depending on your tradeoff between mechanical
and electrical costs you could use some form of bellows/diaphragm
arrangement and a microswitch or similar.

The truly Heath Robinson could also look at something similar with a
spring and pot depending on requisite resolution etc.

How many bits resolution do you need?
What is the order of maximum acceptable cost?



       Russell

2007\04\09@171124 by Dwayne Reid

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The application is to keep the pressure in a plenum constant at some
user-defined value as outlet valves are opened and closed.  The
original approach was to monitor the state of the valves and apply
offsets that approximate the load that the valves caused.

While simple, its a pain to setup.

Its actually kind of funny - that's how the job was originally
presented: monitor valves and generate a DC signal that changes as
the number of open valves changes.  That's easy.

Then they wanted to add trims to each input channel so as to affect
how much change each valve introduces.  This is to compensate for
different sizes of valves.  Still easy.

Then make it so that the main board handles a small number of valves
and add expansion boards as needed.  Still easy but the packaging and
interconnect logistics are starting to take their toll.

And so on.

Finally asked what the actual desired outcome of all this
was.  Answer: keep plenum pressure constant as number of open valves
changes.  OK, sez I, lets just monitor plenum pressure.

As I mentioned in my initial post, I've used Motorola and Honeywell
pressure sensors in past projects.  However, they are a little too
pricey for this application.  Ideally, I'm looking in the Can $5.00
range or less.  Anything more than Can $10.00 is just too expensive.

The Smartec sensors mentioned by Vasile look to be exactly what I'm
looking for.

Thanks again to everyone for their suggestions!

dwayne

At 02:11 AM 4/9/2007, Russell McMahon wrote:
{Quote hidden}

--
Dwayne Reid   <dwaynerspamspam_OUTplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

Celebrating 22 years of Engineering Innovation (1984 - 2006)
 .-.   .-.   .-.   .-.   .-.   .-.   .-.   .-.   .-.   .-
    `-'   `-'   `-'   `-'   `-'   `-'   `-'   `-'   `-'
Do NOT send unsolicited commercial email to this email address.
This message neither grants consent to receive unsolicited
commercial email nor is intended to solicit commercial email.

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