User Manual

4of16 MN301031 RevB
DIMENSIONS StepThree
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

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MaterialCompatibility
 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).
 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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