Manual

4of16 MN301035 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.
LD34Series
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LD35Series
MaterialCompatibility
o TheLD34/LD35seriesismadeof316StainlessSteel(316SS)withacableofPolyurethaneorEthylene
Tetrafluoroethylene(ETFE).TheLD35serieshasaPTFEcoatedFKMfluoroelastomerface.
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).
Optional Desiccant Filter (LD90‐3000):For extra protection against humidity we offer the LD90‐3000
desiccantfilterthatcan
beattachedtotheventtube.
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