Flowline LD32‐S4_1 DeltaSpan - Manual (Page 5)

Rev B MN301040 5 of 16
DIMENSIONS Step Four
Technology
A sealed pressure transmitter is placed near or on the bottom of the tank. A stainless steel pressure
diaphragm within the pressure transmitter is exposed on one side to the application liquid. The other side is
exposed to the reference pressure via a small ventilation tube located inside of the Polyurethane cable. A
difference in pressure between liquid and reference pressures will slightly deflect the diaphragm. The
deflection of the diaphragm is measured by a built‐in microprocessor that provides greater linearity correction
over common thermal compensation methods. A 4‐20 mA current signal proportional the height of the liquid
is generated from the microprocessor.
LD31 Series:
LD32 Series:
Material Compatibility:
o The LD31 / LD32 series is made of 316 Stainless Steel (316 SS), 316L Stainless Steel (316L SS) with a
cable of Polyurethane or Ethylene Tetrafluoroethylene (ETFE). The LD31 series has a bullet nose of
Polyvinyl Chloride (PVC).
o Make sure that the switch is compatible with the application liquids. To determine the chemical
compatibility between the sensor and its application liquids, refer to the Compass Corrosion Guide,
available from Compass Publications (858‐589‐9636).