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PICList Thread
'liquid level'
1998\12\25@235106 by Vadim Jakunin

Hi everyone!
I needed to decide a problem:
Needed to measure a liquid level in the big barrel (tank for the fuel). Is
it Presently used system temporary Trojan war from the bob, walking stick
and rheostat.  I wants to do on pic84 scheme and program, but can not
select an approach variant of sensor. Ultrasound? Or same bob? Something
the another? If someone has understood a task, help an advice. thank!


1998\12\26@124538 by wft

Hey Vadim

Lots of cool ways to measure liquid level.  Is it explosive?  How deep in meters
?  How many levels to detect?
What is your budget?

You can use a pressure sensor to measure the height of the fuel.
You can use a tube with reed switches inside and a floating magnet on the outsid
You can use a tube on the side of the tank  and detect the level with optical se
You can certainly use ultrasonics  (there are many ways to go on this)
You could use a PSD (position sensitive diode), a laser and a floating reflector


Gus Calabrese    Lola Montes      WFT Electronics
4337 Raleigh Street      Denver, CO 80212
303 964-9670......voicemail

Alternate:   791 High Street     Estes Park, CO  80517
if no success with, try ....

1998\12\28@090919 by Mark Willis

Trying to guess/translate here:

 Fuel tank (for some kind of vehicle) - Treat it as Gasoline so
potentially explosive, Gus <G>  55 Gallon Drum or something?
 Guessing that the current fuel measurement system is a (temporary)
float with a potentiometer.  And that something better is desired.
(Unclear what's "better" here, Vadim?)

 More data (as always) would help us <G>


Vadim Jakunin wrote:
{Quote hidden}

1998\12\28@091010 by Vadim Jakunin

Hi, Gus!

I needed device, allowing measure a liquid level in the barrel by the depth
6 metres with accuracy 1 millimeter. Liquid active and inflammable ( for
instance, benzine ). Barrel ÚÁÒÙÔÁ in the land and it is available only
overhand,. Advisable do all without move mechanisms.
Is Afraid that on the lazer or bathyscaph of money little.

I has looked your page.
I did not understand about the jump without the parachute from heights
10000 feets, Who will caught on the land and who will pay money?

{Original Message removed}

1998\12\29@031032 by Mark Willis

I know one company makes a device that'll do this for gas station
installation, the gas pump controller contract I did tied into their
machinery via RS-232 (I still have the manual & code here someplace.)
Seems like a LOT of accuracy you want there (Remember, fuel temperature
changes fuel volume a lot, so just knowing volume doesn't tell you
anything really, unless you know the fuel's temperature as well!)  6000
fuel height states is more than a typical fuel gauge gives you <G>

 I believe they used a capacitance measurement (AC drive of some kind,
on a wire dropping into the fuel tank) but that has been some time so
I'm not absolutely certain today.  I know their machinery is expensive.

 I'll go fire up the old (486DX50) computer that code's on tomorrow &
find their name (Their equipment is for gas stations, not for vehicles,
but you can adapt the principles possibly!)

 Gus's Aerogel skyjump:  Aerogels are very thin protein-based "foams"
in effect, if you landed in the desired spot you would hit this very
soft (Deep, I hope?) gel that might well stop you safely.  If you
missed, it would have been nice knowing you, though...  (I've wondered
if the same could be done with a deep swimming pool, with lots of air
injected to "froth" it up so it was mostly bubbles at the surface?  I'll
let someone else be a crash test dummy on these, myself.  Too much
adrenaline for my tastes, been there, done that.)


Vadim Jakunin wrote:
{Quote hidden}

> {Original Message removed}

1998\12\29@105024 by Bill Kichman

I may have some helpful input:   I am building a home built helicopter (see and have an improved fuel sender and gauge ready to install.
The sender is for all intents and purposes a 1/4" aluminum tube the vertical
length of the tank with an aluminum #10 solid conductor spanning the full length
in the very center of the tube. There is an epoxy embedded circuit PCB at the top
of the tube. The circuit works on capacitance principle, with the capacitance
varying with the depth of fuel within the tube.  Easily calibrated with 2 pots on
the top.  For a fuel level gauge, this has got to be one of the best ways to
go-no moving parts, hence the reason for the needed upgrade from a rheostat type
sender in the first place.  If needed I can provide a manufacturer's name.  Hope
this helps.

Mark Willis wrote:

{Quote hidden}

> > {Original Message removed}

1998\12\29@125109 by Peter L. Peres

picon face
On Tue, 29 Dec 1998, Mark Willis wrote:

> missed, it would have been nice knowing you, though...  (I've wondered
> if the same could be done with a deep swimming pool, with lots of air
> injected to "froth" it up so it was mostly bubbles at the surface?  I'll

imho, assuming that seriously bubbled water has the same characteristics
as normal water can be quite deadly. I think that some naval research once
looked into blowing air out of the hull through many holes to make foam
around it that would *reduce* resistance at high speed. Me, I'd not jump
into a bubbled pool, even if 5 times deeper than the clear water kind. You
can't see inside, in the first place, and you can't know if you will
*float* at all. Probably *not*.


1998\12\30@000444 by Mark Rokus

Mark Willis wrote:

>   Back On Topic for a second: for measuring liquid level haven't I heard
> of something that listens to the bubble sound (or bubble back-pressure)
> of a air bubble forced through a tank?  IIRC someone was doing that for
> sewage tanks or some such.

That works fine for liquids that wouldn't degrade because of the injected air
(ie - sewage)
For fuel, you will definately degrade the quality in short order.  I have used
"bubblers" on water systems using an analog guage and a small hand pump or
constant bleed source and they do fine.  I don't think it is a good way to go
for anything that is sensitive to vaporization and air emulsion.
Mark Rokus

'Liquid level'
1999\01\02@014817 by tony arkles
You could also use a float and a potentiometer (sp?) with an analog->digital

'Liquid level'
2003\06\24@183135 by Olin Lathrop
face picon face
>          i need to check the liquid level (height) in a tank , i was
> triying to get something cheap or making one by myself. The tank is 9
> feet tall and the liquid level will vary between 0-6 feet. I just need
> a resolution of about 1". The distance from the sensor to the PIC will
> be about 3 feet.  Any idea?

Ha, ha.  Many hairbrain schemes have been discussed here in the past.
Check the archives.

Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014,

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