8. GETTING STARTED
Pressure transmitters are designed to be completely submersed within the application fluid. The
transmitters can either rest along the bottom of the tank or be suspended at any desired level
within the tank. Please note that the physical location of the level transmitter will indicate the
lowest level of measurement within the tank.
For example: mounting the transmitter 2 feet from the bottom of the tank, then the lowest reading
of liquid will be 2 feet from the bottom.
The Specific Gravity (SG) of a liquid will not change the pressure of the transmitter, but will affect how the transmitter reads the liquid
height. Remember, liquids with a SG < 1.0 are lighter than water (Oil) and liquids with a SG > 1.0 are heavier than water. (Sulphuric Acid)
GETTING STARTED (Continued)
How does Specified Gravity affect pressure transmitters?
How to convert Pressure into Liquid Height?
Pressure transmitters are all defined by the pressure range or distance range. To convert pressure
to Liquid Height, use the following ratio:
1 psi = 2.31 feet of water
or
1 psi = 0.704 meters of water
10 psi x 2.31'/psi = 23.1'
or
23.1'/2.31 = 10 psi
Therefore, a 10 psi transmitter will have a
Liquid Height = 23.1 feet
With the above ratio, you can always find the Liquid Height or Water Column (wc) of any Levelpro
pressure transmitter
SG = .0 (Water H
20
) SG = 1.2SG = 0.9
1 psi
2.31 Feet (S.G.)
H
2
Water has a SG = 1.0.
A SG <1.0 required more liquid (a taller water column) to equal the same pressure or height as with water.
A SG >1.0 requires less liquid (shorter water column) to equal the same pressure or height as with water.
Continuous Submersible Level Transmitter
Levelpro-Sensors Manual
07
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