Instruction Manual 2009
Rev3
DFS2Doppler FlowSwitch
4
MountingThe Transducer
a)Select alocationformountingthesensorat apoint wheretheflowprofileisfully
developed. Generallytheprincipleof 10pipediametersofstraightpipeupstream,
and5pipediametersdownstreamwill suffice,butshouldvalvesorbendsexist
upstreamofthesensor, the amount of straight pipeimmediatelyupstreamwill need
tobe increased.
b)Ensurethat the sensorismounted asfaras
possiblefrompotentialnoisesources,suchas
pumps, controlvalvesetc.and mount the
sensorat approximately3/9o’clockonthe pipe
(ifhorizontal) toavoiderrorsduetoair pockets
on top,orsediment at thebottomof the pipe.
c)Eitherverticalorhorizontalpipe runsareacceptableforsensormounting.
d)Beforeattachingthetransducerheadtothepipe surface,an areaslightlylargerthan
theflatsurfaceof the transducermustbe cleanedtobaremetal. (A small amountof
pipepitting, evenwithspotsofpaintorrust, will not causeproblems).
e)The transducermustbe mountedaccurately, paralleltothepipe axis, forcorrect
performance,andtransducertopipecontact shouldbealongthecentrelineof the
transducerhead.
f)Bondingtothepipe isachieved withsilicone
couplingcompound. Besuretofill inanyair
gapsthatmayremainatthepipetransducer
interfacewithadditionalcompound.
A pipe clampkit isincludedwiththeflowswitch.
It includessilicone couplingcompound,a
Neoprenerubberpad, andfourpolyamide 12
strapsforpipediametersupto300mm. In
applicationswithexcessivevibrationit is
recommended that theNeoprenerubberpad is
insertedbetweenthepipe andthetransducer.
Coupling compoundmustbeapplied toboth
sidesofthepad.
Mountingthe Switch
The DFS2 electronicsishousedinawaterresistanthousing, whichshouldbe
mountedinalocationwheretheambient temperatureiswithintherangestated in
thespecificationsi.e. -10°Cto50°C.
3 O’CLOCKPOSITIONON PIPE
GOOD
