Elster TRZ2 - Operating Location Requirements; Flow Disturbance Considerations

Elster-Instromet
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3. Operating Location
The minimum length of the inlet section for TRZ2 must be at least twice the nominal di-
ameterforreasonsrelatingtomeasurementaccuracy.Aninletsectionof≥5xDNisrequired
forTRZ2DN50.
Theinletsectionmustbedesignedasastraightpipesectionwiththesamenominaldiameter
as the meter.
Thelengthoftheoutletsectionisatleast1xDNofthesamenominaldiameter.
Flowdisturbances
resultingfrom:
Typical
inlet sections
Pipe sections in-
stalled at a distance
of 2D upstream of
the meter inlet
TRZ2
PTB approval
symbol
Q
Minor disturbances
– single manifolds
–twinmanifolds
– diffuser and
– contractors
L≥2D
Noowconditioner
L≥5D
Major disturbances
– pressure regulators
for gas
– other restrictor
devices
L≥2D
Noowconditioner
L≥5D
Flowconditioner
recommended
If you…
– wishtomixin odorization agents or
– use solenoid valves,
pleasealwaystthemonlydownstream of the meter.Otherwise,theunitmaybedamaged.
D97
7.211.17
7. 2 11
97.10
DE-09-MI002-PTB001