ΤΟΞΩΤΗ ΑΥΤΟΚΑΘΑΡΙΖΟΜΕΝΗ ΕΣΧΑΡΑ ROTATING SELF - CLEANING SCREEN
5. Κτένι - Comb
ΤΟΞΩΤΗ ΑΥΤΟΚΑΘΑΡΙΖΟΜΕΝΗ ΕΣΧΑΡΑ
ΤΟΞΩΤΗ ΑΥΤΟΚΑΘΑΡΙΖΟΜΕΝΗ ΕΣΧΑΡΑ ROTATING SELF - CLEANING SCREEN
ΤΡΟΠΟΣ ΛΕΙΤΟΥΡΓΙΑΣ
Η τοξωτή εσχάρα χρησιμοποιείται για την αφαίρεση των στερεών ορισμένου μεγέθους από τα ^ τ ο . Η εσχάρα συγκεντρώνει τα παρακραιούμενα στερεά και τα ρίχνει σε ένα κάδο στρογγίσε^. Η εσχ<^
να λειτουργήσει χειροκίνητα ή αυτόματα. Η αυτόματη λειτουργία ρυθμίζεται ή από χρονο6«κόπτη. ή αηό δια
κόπτη στάθμης που ΡιειτουργεΙ ή με πλωτήρα, ή με ηλεκτρόδιο.
Ο βραχίονας με το κτένι κατά την περιστροφή του. καθαρίζει την εσχάρα από τα στερεά που έχει στΛΊ^τήσει αφαιρώντας τα αηό τα υγρά λφατα. Μόλις το κτένι καθαρκτμού φθάσει στο ανώτατο στ^είο της εσχάρας, τα στερεά απορρίπτονται αυτόματα στον κάδο στραγγίσεως που είναι κατασκευασμένος κατ' επιλογή, ή αηό σκυ
ρόδεμα ή αηό ?ιαμαρίνα.
Τα στερεά αηορρώπονται από το κτένι με ένα ξέστρο στερεωμένο στον βραχίονα. Για τον σκοπό αυτό το ξέστρο κάνει μία ταλάντωση.
Ο στ3νδεσμος μεταξύ κτενιού και βραχίονα είναι ελατηριωτός. ώστε όταν υπάρχει ισχυρή αντίσταση αηό ενσφη- ντομένα στερεά, το κτένι να υποχωρεί.
Καλάθι συλλογής αηό ανοξείδωτο χάλυβα, διατίθεται προαιρετικά. Η απομάκρυνση tow εσχαρισμάτοιν μπορεί να γίνεται με ειδικό κάδο ή με μεταφορική ταινία ή με άλλο τρόπο.
HOW IT WORKS
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The curved screen is used lo subtract the solids of a certain from the waste water.
The screen concentrates the retained solids and removes them into the recovery vessel. The saeen is possible to function manually or automatically. The automatic function is regulated either by tiirrer, or by level switch with float, or by level switch with electrobes.
While the arm with the comb rotates, it cleans the screen from the solids which have been retained, subtracting these from the waste water. As soon as the cleaning comb reaches to the higher pxjlnf of the screen, the solids are automatically thrown into the recovery vessel, which is constructed of either conaete or steel.
The solids ai oscillation.
removed from the comb by a scraper holded on the arm. For this reason the comb makes an spring, so that when there is a strong resistance by dogged solids.
The bond between the comb and the the comb retreats.
A recovery basket made of stainless steel is optionally dispiosed.
The removal of the waste solids may be done by a special basket or by a conveyor belt or by other ways.
H εταιρεία διατηρεί το δικαίωμα της αλλαγής των ιιαραιιάνω χαρακτηριστικών χωρίς προειδοποίηση.
The company preserves the right to change the above specifications without notice.
€ ) E V R O M A R M E T
^ ^ Head OfFiceENVmONMEffTAL PROTECTION SYSTEMS ^^^?724Μ 83,'Ϊ5κ475, 7223620 - Fax.: 724216
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Ultrasonic Measurement p ro s o n ic F D U 80... 85
S e n so rs for n o n -co n ta ct, c o n tin u o u s m e a su re m e n t of le v e l a n d flo w .S u ita b le for u se in e x p lo s io n h a z a rd o u s a re a s
Applicalioii ftosoriic FIHJ . ullrasonic i·--·' nxjasuiiiiy u · · j contact mer.?‘ ir.
• FDU 80 Liquids:
Solids
• FDUet Solids:
• FDU 82 Liquids Solids
• FDU 83 Liquids Solids
• FDU 84 Solids:
• FDU 85 Solids
Features at a Glance
• Comptete sensor programme ior non-contact, continuous measi^ement ol level and flow
• For use in flumes, weirs, tanks and
• Insensitive to dirt and txjild-up
• Optional integrated heating to protect against a txiild up of ice on Hie sensor
• Integrated temperature sensor tor ultrasonic njn time correction
• Wide range erf mountings using flange or thread
• Weather resistant and sale against submersion (IP 68)
25 in (82 ft) 15 :r. ;M7 ft)
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Measuring System The complete measuhng system consists of
• the Prosonic FDU 80βΐ/8Ζ'83/84 Of 85 ultrasorW: sensor
• the transmitter - Prosonic FMU 860:1-channel
version for level measuement - Prosonic FMU 861:1-cfannel version for flow measurement or level rneasurementor - Prosonic FMU 862 2-channel, for
differential measurement or for two independent measisements
Sensor Accessories The accessores (see pages 11 and 12) ensure that the sensors can be adapted to special process conditions
• Alignmere unit FAU 40 for the sensor
• All-weaher protective cover
• Mountng ‘rame
• Sensor fbnges
• External temperature sensor
• A septate power supply urit is avalabte ‘or heated sensors
The emitter in the se"sor is exciteo electrically and senes an ultrasonic pulse in the direcaor cf the surface of the product which partiaiiy reflects the pulse. This echo is ce®cted by the same sensor, now acting as a directional microphoie, and then converted back into an electrical signal.
The time between transmission and reception of the pulse (the sonic run time) is directly proportional to the distance between the sensor and the oroduct surface. Ths distance is determined by the vsoaty or souno c and the run time t Lsang the formula;
D = ^
F I Miximum Ιβ·
Blocking Distance Due to the' "oing time cf Jne sensor, there is a zr~e immediately below the sensor an w ch returning echoes cannot be cstected. This so-called blocking distance B determines the minimum distance between the diaphragm cf the sensor and the maximun level in the silo. This distance depends on the type of sensor used.
P la n n in g R e c o m m e n d a tio n s
Maximum Measuring Range The correct sensor for your particular application depends on the process and ambient conditions When selecung the sensor, take into account that the maximum measuring range of the individual sensor is determined by the attenuation of the ultrasonic pulse by the air as well as by the reflecting characteristics of the product surface Both the level of background noise (e g when filling) and the mounung point also can affect measurement
Application Requiremenu OptirTxxnconr»onsin tanks or silos _ _
are achieved t 1 1
. the lovner edge of the sensor is bekj the sik) roof.
• the detectionlone does not include | | any internal fedures or the flilmg f l curtain,
• the surface of solid is hard and coarse-gr»nad
• the surface of r e liquid is calm no vapour is farmed
• operation is isider normal · ■ pressure
• the vessel is not b erg filled during ■ measuramani
Less than optsnum conditions · m the measursig range of me sensors | |
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Calculating the Range
• By using the table check which factors affect measurement
• Add together the reduction values
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;<n!rwic· mearcte The diagram below shows ideal echo
attenuation curves
• Move the ideal curve downwards corresponding to the sum of the reduction values
• The maximum range is indicated at the intersection where the ideal cuve and the interference level line meet
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Guidelines when Mounting
• Check that the maamunri level height does not come withm the blocking distance of the sensor (see page 9.
-Technical Data-).
. If possible, the face of the sensor should lie parallel to the surface of the product.
• The PE coating on the diaphragm of the FDU 84 and FOU 85 is an integral part of the measunng system and must not be damaged during installation.
• The connecting cable of the FDU sensor is not designed as a supporting cable Do not hang the sensor from i t
• For dust explosion areas The connecting cable of the FDU must be laid in piping Local regulations for explosive at'-mospheres caused by dust must oe observed
• All nations guidelines applicable must be obsersed m explosion hazardous
Mounting in Vessels
• Install the sensor so lha: its lower edge projects into the vessel.
• Position the sensor so that neither the filling curtain nor any internal fittings e g. an accitional limit sv.iich. are within the detection zone
• The sense· must be pos t oned ai the centre of t-'e outflow funnel so that an echo is received when the silo is empty
• Accurate cositioning of tne sensor can be simpf' ed using the FAU 40 alignment un t (see Page 6 -Accessc'ss-).
• The cable of tne prosor : sensor is not designeo as a supporti.-.g cable. Do not use it as a suspension wire.
• If the sensor s to be installed in tan- containing very aggressive media.
Check that tne chemical anc ; t n resistance of the sensor materials p | rnieet these requirements
Right.
FDU on J
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M ounting on a Mounting Pipe The sensor shoukJ ce Tourreo cn a pipecr’ly.vhen?e~ax:r-u"- s.e ccrr.es within the P cr< rg c s:a~ce.
Please note:
• No condensate cr c-.'c -„p c ' -naterial should form in the c ce.
• Select a pipe with a Giarr-.eter as large as possible (see ficures and table).
If there is a possibi.ity of b uiic-jp in the pipe the diameter should be significantly larger.
• The inner surface of the pipe should be as smooth as ocssibie (nc edges the open, the ppe sncuic as the temperature .vith.n diher significanth/ •'cr- r : vessel.
150 <3CC 355 <5X
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Mountino above Flumes To achieve the highest accuracy, the sensor should be situated immediately above the high water level (100%) plus the blocking distance B (see page 9.
-Technical Data-).
The sensor must always be mounted perpendicular to the surface of the water and be above the centre of the flume.
The appropriae mounting distances iwtth ,'espect to the flume are to be _ _ maintained (see op ia tin g manual 1 1 -Prosonic-. BA100F/00/e) When mounted in the open, the sensor must be proiecsed against the sun c m| protective cover, so thai -’' ' J B compensation works correcOy We recommend an ail weather protection cover (see page 10. «Accessories | |
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c t r ic a l C o n n e c tio n Connecting the FDU The sensofs are scco'ied with a fixed cable of 5 m m ΐ'- ς ; " as star.daid <30 m if required, cross sect cn 0 75 mm^).
They can be connected.
• directly m the FMU connection compartment; :-e ccnrecung terminals are ces c-ed ‘or cross sections up to 2 5 r an additional cao e which may be -c up to 6 Ω per cc-^e (terminal box a 'c : in delivery) A 2-.·. · must be usee is;-£
braiding max. 6 Ω The screening se- cable. Do not grour and lay to the tra- e'ectncal C'ea-·
explosion haza'or.s = national guide'.res ac:
observed.
en required : SCO m in length,
"aximum 60 nF :ao!e not included e screened cable ir'ir g : metal := as a return :o the screening
r.er without any
Ultrasonic sensor w ith Heating The sensors FDU 80 and FOU 81 can be sifliplied with heating umts For heated sensors
The conoectirg terminals for 8ne heating iBTil are delivered wfSi the sensor They are to be nnounted in tfe conrtectioo compartment of the transmitter.
• Technical data for an external power supply for heating tfie sensor -2 4 V ±10 % DC - power supply 230 V - for each healed sensor. 250 mA, 3 W
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Connecting the sensors ai>o\« left:
FOU 80, FOU 81. FDU
FDU 83. 84 and 85 (ground to FMU)
--- 30 :o 300 m
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i FDU a 84 85 I
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cessories Mounting Frame Material.
700 mm gal·/, steel 700 mm, 1.4301 I400mmgalv. steel 1400 mm, 1 4301
Cantilever for mounting frame For rroummg Prosorc sensors FDU 80 and 81 over open cha*'neis Material/versen: Order numlaer 500 mm, galvanrsed steel 919790-0000 500 mm, 1.4301 919790-0001 1000 mm. galvamseo steel 919790-0002 . 1000 mm, 1 4301 9197900003
C»rn;«s r· tor moumng
£ 1000 lOK 750
Wall Bracket Materal:
ga:-.aniS60 steel r«.~. -
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All-Weather Proteaive Cover For P-cscr o sense's =: e-'c Ma:e'3.:
PF-3F i-? -5 3 -:
fixed to tf-e crctect.'.e ::. e · t-e m c -'t r.g eye ct me se'se· ~ . s t :
External Tempierature sensor Product structure Application: tor heated sensor and when Standard version
temperature is riot to be measured in FMT 13 1 : non certificate, no c |
the sensor. __________
Housing: epoxy resin coating, IP 68 Sensor; 1 4571 stainless steel To be mounted outside explosion hazardous areas only (Ex-version in preparation).
Two-core screened cabling Order number 919928-0001
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Protective sleeve for temperature sensor FM T 131
Material: corrosion resistance steel 1.4571
Order N o : 942046-0000 Alignment Unit FAU 40 For easy mounting and positioning of
;-e FDU sensor (see Tecnmcal i-formation Tli79F.O0/a) Flanges Version, similar ti DN80PN 16 in I ON 100 PN 16 in ON 150 PN 16inPPs ON 200 PN 16 in
The maximum operating pressure of the sensor applies
Other flanges on reouest Order number 919789-0000 919789-0002 919789-0004
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of FDU 80 and FDU 81 rz.-.er sucp;y {2 - \‘zz) u- 1 m protective 't-S in g lF c c - Ξ :
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