Manual

14of16 MN301040 RevB
INSTALLATION StepTen
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
between0and176°F(‐18to80°C).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.For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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