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VERGELIJKING MEETPRINCIPES
condensatie damp
druk temperatuur
schuim contaminatie
permittiviteit densiteit
gasvorming corrosie
kristallisatie
viscositeit abrasiviteit
VLOEISTOFFEN
MAGNETISCH PEILGLAS
MAGNETOSTRICTIE
ULTRASOON
HYDROSTATISCHE DRUK
RADAR
Ultrasoon
• Meetprincipe
Pic: http://en.wikipedia.org/wiki/Ultrasound
• Voordelen:
 Contactloos
 Betaalbaar
 Nauwkeurig
Ultrasoon
• Nadelen:
 Te gebruiken in juiste applicaties :
bv niet bij schuim, condens,
dampen, trillingen, gasvorming,
onder druk, stof
 Opletten voor valse echo’s van
roerwerken, ladders, ed. (kunnen
uitgefilterd worden)
 Niet betrouwbaar bij het vullen
 Beam angle
Radar
Pic: Retec: Nivelco
• Meetprincipe
2 4 8 12 18 27f GHz
Pulse Radar Principle
Radar
Pic: Retec: Nivelco
24
• Voordelen:
Geleide Radar :
• Perfect aanpasbaar aan silo
• Eenvoudig meetprincipe
• Ongevoelig voor valse echo’s
• Moet niet onder hoek geplaatst
worden, detecteert alleen in de
zone van de kabel (ook hier
diverse soorten kabel, waardoor
ook diverse soorten meting)
Contactloze Radar
• Voordelen: contactloos,
hygiënisch, ongevoelig voor
dampen, schuim, ….
Radar
• Nadelen:
Geleide Radar :
• ! Bij voorkeur max 20m–
trekkrachten van kabel op
silodak worden te groot.
• Overkill?
Contactloze Radar
• Opletten voor storingen/valse
echo’s door roerwerken, ladders,
ed.
• Overkill?
! Diëlectrische constante/
permittiviteit : speelt altijd een rol
Hydrostatische druk
Pic: http://www.ikhebeenvraag.be/mediastorage/FSImage/A0/2487/eurekas.jpg
• Meetprincipe
• Voordelen:
 Uiterst betrouwbaar
 Alle meetbereiken
 Modulair
 Zeer nauwkeurig tot 0.05% of
beter op de full scale
 Inzetbaar in alle media
dankzij coatings
 Temperatuurcompensatie
 CIP
• Nadelen:
 Moet correct gebruikt
worden (kabel,
membraan)
 Opletten met gebruik in
kleverige producten
Hydrostatische druk
Magnetisch Peilglas
Pic: wikipedia
• Meetprincipe
Magnetisch peilglas
• Voordelen:
 Max temperatuur tot 450°C
 Maximum druk tot 420 Bar
 Ook voor agressieve producten –
verkrijgbaar in PP of PTFE
 Zeer robuust/onverslijtbaar
 Maatwerk
 Ongevoelig voor dampen, schuim
of condens
• Nadelen:
 Reed-contacten kwetsbaar
 Nauwkeurigheid beperkt
Magnetostrictie
Pic: Wikipedia
• Meetprincipe:
• Voordelen:
 uiterst nauwkeurig, tot op
0,1 mm
 Het toestel bestaat in kortere
staafversies of langere
kabelversies
 Breed inzetbaar (bvb onder druk,
met schuimvorming,…)
 Geeft een betrouwbaar signaal
bij vullen van de tank
 Kleine dode zone
• Nadelen:
 Contactmeting
 Soms onhandig in geval van
plaatsgebrek boven de tank
 Kan niet gebruikt worden voor sterk
viskeuze producten
Magnetostrictie
Pic: Retec: Nivelco
VLOEISTOFFEN
ULTRASOON
RADAR
HYDROSTATISCH
MAGNETISCHPEILGLAS
MAGNETOSTRICTIEF
HOGE TEMP
HOGE DRUK
VACUUM
SCHUIM
DAMPEN
AGGRESSIEVE MEDIA
KLEVERIG
NAUWKEURIGHEID
METEN BIJ HET VULLEN
ROERWERK
OPEN KANAAL
PERMITTIVITEIT
CONTACTLOOS
PRIJS
Schakelaars
Pic: Retec: API, KSR Kuebler, ATMI, Nivelco
VASTE STOFFEN
RADAR
CAPACITIEF
PEILLOODSYSTEEM
Radar
Pic: Rosemount
• Meetprincipe
appl /
vloeistoffen
slurrie
poeder, granulaten
Pasta’s
Stoom, damp
golven
gasbellen
agressieve, toxische,
corrosieve producten
schuim
Radar
Pic: Retec: Nivelco
• Voordelen:
Geleide Radar :
• Perfect aanpasbaar aan silo
• Eenvoudig meetprincipe
• Ongevoelig voor stof, valse
echo’s
• Moet niet onder hoek geplaatst
worden, detecteert alleen in de
zone van de kabel (ook hier
diverse soorten kabel, waardoor
ook diverse soorten meting)
Contactloze Radar
• Contactloos, hygiënisch
• ongevoelig voor stof
• Nadelen:
Geleide Radar :
• ! Bij voorkeur max 20m–
trekkrachten van kabel op silodak
worden te groot.
• Kabel gaat in het product
Contactloze Radar
• Opletten voor storingen/valse
echo’s door roerwerken, ladders,
ed.
• Overkill?
! Dielectrische constante/ permittiviteit :
speelt altijd een rol
Radar
Pic: Siemens
Peillood
Pic: retec UWT
• Meetprincipe:
• Voordelen:
 Zeer duurzaam
 State of the art
communicatie
 Intelligente diagnose
 Inzetbaar in bijna alle
toepassingen
• Nadelen:
 Veel vooroordelen
 Meet niet tijdens het
vullen
 “Semi-continue” meting
Peillood
F =
1
RC
t (“f”)
V
Capacitieve niveaumeting
Pic: Retec: Fluidwell Instruments
• Meetprincipe
• Voordelen:
 Eenvoudig meetprincipe,
makkelijk in ingebruikname.
 Erg geavanceerde toepassing
mogelijk
• Nadelen:
 Bij goedkopere
oplossingen is de
gevoeligheid een punt
Capacitieve niveaumeting
VASTESTOFFEN
RADAR
GELEIDERADAR
PEILLOODSYSTEEM
CAPACITIEF
HOGE TEMP
STOF
AGGRESSIEVE MEDIA
KLEVERIG
INTERFACE
NAUWKEURIGHEID
METEN BIJ HET VULLEN
PERMITTIVITEIT
WIJZIGENDE MATERIAALKWALITEIT
CONTACTLOOS
PRIJS
Schakelaars
Pic: Retec: UWT
OPLOSSING
Vragen?
Martin.koch@retec.be
www.retec.be
#Retec_Level

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