Manual

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).
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