Flowline LD30 DeltaSpan - Manual (Page 7)

Rev B MN301030 7 of 14
GETTING STARTED Step Six
The LD30 series will be installed near the bottom of the vessel. The switch can be installed through the side
wall or through the bottom. 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 1 foot from the bottom
of the tank, then the lowest reading of liquid will be 1 foot from the bottom.
Note: When installing the LD30 series, design an installation method where the unit can be removed without
having to remove the fluid from the vessel. The use of valves between the transmitter and the vessel can allow
transmitter removal without draining the fluid.
How to convert Pressure into Liquid Height?
Pressure transmitters are all defined by the pressure range and not by Liquid Height. 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
 Therefore, a 15 psi transmitter will have a Liquid Height =
34.65 feet (10.56m):
15 psi x 2.31’/psi = 34.65’
or
15 psi x 0.704 m/psi = 10.56m
With the above ratio, you can always find the Liquid Height or
water column (wc) of any pressure transmitter.