DPM TT Series - Pressure Connections; Connection Types and Procedures

TTSeriesLRManual
Page04
DISPLAY
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AutoZero... Whenevertheautozerosequenceisinitiatedmanuallyoratpreset
‘AutoZero...’willbedisplayeduntilthecycleiscomplete.
Beinganautoranginginstrument,theresolutionanddecimalpointswill
changeaccordingtothepressurebeingapplied.
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Slow4 Showswhichmodetheinstrumentisin.
PresstheFASTSLOWkeytochangethemode.

7.7
m/s
Showstheunitofmeasurement.
PressUNITStotogglebetweenunitsofmeasurement.
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AvgVel
4.5
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Showsthe averagevelocityofthereadingsstored.
Store
10
Showsthenumberofreadingsstored.
Upto2500readingscanbestored.
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TTSeriesLRManual
Page04
PRESSURECONNECTIONS
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Gauge/DuctStatic
Measurement:
ConnecttoSignalIn. LeaveReferenceopentoatmosphere.
Readingsmaybepositiveornegativedependingonwhetherthesystem
undertestisaboveorbelowatmospherepressure.
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OrificePlates: ConnectupstreamtappingtoSignalInanddownstreamtappingtoReference.
Pressurereadingsshouldalwaysbepositive.
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FlowGrids: Connect+VetappingtoSignalInand‐VetappingtoReference.
Pressurereadingsshouldalwaysbepositive.
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InletCones: ConnecttappingtoSignalInusing‘T’piecestojointheannulartapping
together.LeaveReferenceopentoatmosphere,ensuringthattheopenport
isshieldedagainstsignificantairmovementfromtheingoingairstream.
Pressurereadingsshouldalwaysbenegative.
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TotalHeadProbe: ConnecttoSignalIn.LeaveReferenceopen.
Readingsshouldalwaysbepositive
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dpm‐iPitotTube: InputthePitotTubefactor0.838.
ConnectcleartubingtoSignalInandblacktubingtoReference.
UseUNITStotoggletom/sorft/mindependinguponmodel.
Readingsshouldalwaysbepositive.
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EllipsoidalPitotTube: InputthePitotTubefactor1.000.
ConnectcleartubingtoSignalInandblacktubingtoReference.
UseUNITStotoggletom/sorft/mindependinguponmodel.
Readingsshouldalwaysbepositive.
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 
AutoZero... Slow4
7.7
m/s
AvgVel Store
4.5 10