User Manual

14of16 MN301031 RevB
INSTALLATION StepNine
TheLD31/LD32Seriesisdesignedtooperatewhilesubmergedintheactualapplication
liquid.Avoid installing the level transmitter along the bottom of the tank is materials
such as sludge will build up and coat/cover the transmitter.This also includes any
debristhat will settle alongthe bottom of the tank.In these applications, it is best to
suspendthetransmitterabovethehighestlevelofsludge/debristhatwilloccur.
1. Location: Select a location where the  temperature of the transmitter  will be
withinthespecificationofthesensor(seespecificationpage).Distancefromthe
receiverislimitedonlybytotalloopresistance.
2. Position: The transmitter is not position sensitive.However all standard models are originally
calibrated with the unit in a position with the pressure connection downward. Although they can be
used at other angles, for best accuracy it is recommended that units be installed in the position
calibratedatthefactory.
3. Mounting: The transmitter can be mounted via several methods.It can be suspended from the
electrical cable, it can be placed resting on the bottom of the tank in either horizontal or vertical
orientation,oritcanbeattachedtoapipeorhangwirebythe1/2˝NPTmaleconnectiononthetopof 
thehousing.
Interference:TheDeltaSpan™isdesignedtooperateunderthesurfaceoftheliquidin
thetank.Avoidinstallations where othertankrequirementswillcausethetransmitter
to move or swing.Example:A mixer blade could cause the level transmitter to whip
around within the tank.An alternative would be to move the transmitter to a more
stablesectionofthetankortoinstalltheLD31seriesinsideastillwell/droptube.The
stillwell/droppipewillminimizetheeffectscreatedbythemixer.
Termination:The cable for the DeltaSpan™ is typically terminated at a junction box
locatedontopofthetank.Sincetheventtubeiscontainedwithinthecable,the pressure
withinthejunctionboxmustalwaysbethesameasthereference(typicallyatmospheric)
pressure for the liquid.The inside of the junction box must be clean, dry and free of
moisture.Add the optional pressure fitting (LD90‐_001) to complete the package.The
LD90‐_001featuresa2”NPTthreadformountingandaliquidtightconnectortosealthe
cableinterface.
Note:Use caution when sealing the cable at the top of the
tank.The ventilation tube
mustbeopenandfreetoallowairtoflowbac ktothepressurediaphragm. Avoidblocking
theventilationtube by compressingthe cable.Alwayskeepthecableterminationclean,
dryandfreeofmoistureandpreventliquidfromenteringtheventtube.
Note:A ventFilter is provided on theend of the vent tube.If the application  requires
theventtubetobecuttolength,thenremovetheventfilterandplaceontheendofthenewendofthevent
tube.
Note:Forextraprotectionagainsthighhumidity environments, Flowlineoffersthe
LD90‐3000desiccantfilter
thatcanbeattachedtotheventtube.
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