D-1401 & D-1402 Portable Metering System Installation and Operation Guide • 03-17
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When using aD-1402 system, theindividual top and bottom turbine
frequenciescan beobserved asareference to theamount of rotational swirl
that is present at each insertion depth measurement point.
To utilize this function, set themiddle switch to “SELECT”. The right switch
can then betoggled between “TOP” and “BOTTOM” to display the
individual turbinefrequencies.
A stable, uniform flow velocity at themeasurement depth will beindicated by
having the same or very close (+/- 10%) to thesamefrequency reading on both
thetop and bottom turbine.
A significant differencebetween thetop and bottom turbinefrequency
numbers will indicatethepresenceof flow turbulence andswirl at the
measurement depth. The top and bottom turbines rotatein oppositedirections.
Turbulenceand swirl will either increaseor decrease thespeed of rotation of
oneof theturbines and will havetheopposite effect on theother turbine.
2.5 SYSTEM STORAGE AND MAINTENANCE RECOMMENDATION
1. Alwaysstorethesystem in itscarrying case when not in use.
2. Beforelong-term storage of the system, blow all excess water from the flow
meter turbine assembly and wipe the flow meter stem assembly dry with a
clean cloth. Donot put any lubricantson the turbine assembly. Oil based
lubricants will damage the flow meter’ s o-ring seals.
3. If storing thesystem for long periods of time, removethe 9-volt battery from
the Display Module and store it separately.
4. Theflow meter’shot tap adapter should bepushed completely down over the
turbineassembly and locked so that theturbinesareprotected when moving
thesystem to anew location or when storing thesystem.
5. Theflow meter turbines, bearingsand shaftscan becleaned using a30 percent
whitevinegar to 70 percent tap water solution. An old toothbrush can beused
to lightly brush around thebearings. Rinsewith clean water and blow off
excess water before storing.
2.6 FLOW METER INFORMATION
