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Pressure transducer correction for Specific Gravity

Pressure transducer correction for Specific Gravity

Pressure transducer correction for Specific Gravity

(OP)
Hello,

I have a JP5 jet Fuel tank.  The level in the tank is monitored by a Pressure transducer at the bottom of the tank having a 4mA - 20mA output.  The Analog gage for observing the tank level is scaled from 0ft(4mA) to 40ft (20mA).  How would I correct the analog gage readings to compensate for JP5 having a Specific Gravity of .8

Looking for a formula I could use to create a table of corrections or correction graph

Rgds

onrev321

RE: Pressure transducer correction for Specific Gravity

Hi nonrev321

If the original scale was calculated for water (not sure why a fuel tank would be) but I would do it like this:-

    Ρw * g * h1 =  Ρf * g * h2

     1000 * 9.81 * h1 =   800 * 9.81 * h2

so 1.25h1  =  h2

where h= height of fluid

      g= gravity const.

     Ρ= density of fluid

desertfox

RE: Pressure transducer correction for Specific Gravity

DesertFox,
That is right, but a little confusing to me.

The equation is P=ρgh, so I would write the derivation as:

ρwater*g*hindicatedfuel*g*hfuel  so:
ρwaterhindicatedwaterSG*hfuel  Finally:

hfuel=hindicated/SG

So just divide your calculated height by SG (just like DesertFox said) to get the actual height

David

 

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