Pressure sensor milibar value decrease when milk temperature is decrease from 20 to 4 C
<p>our application is measure the tank Level using pressure sensor.then we convert the level to qty. </p>

<p>our problem is 
temperature is decrease from 20 C to 4 C pressure level is also decrease(About 10 MM ).</p>

<p>we used following formula for Pressure to Level conversion</p>

<p>L = P / (ρ x g)</p>

<p>ρ = ρ0 x SG</p>

<p>ρ0 = Density of liquid (1000)</p>

<p>SG = 1.033 (at 4 C) </p>

<p>(we used density of milk = 1.003073 - 0.000179t - 0.000368F + 0.00374N)</p>

<p>where t = temperature in degrees C; F = percent fat; and N = percent nonfat 
solids(SNF)</p>

<p>g  = 9.80665 ms-2</p>