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CAPACITIVE LEVEL CONTROLS

CAPACITIVE LEVEL CONTROLS
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CAPACITIVE LEVEL CONTROLS

Product catalog summary
Working Principle
Capacitive level controls function based on the principles of capacitance, where changes in capacitance due to material levels in a tank are detected using a high-frequency alternating voltage. The tank walls and probe electrode serve as the capacitor's armatures, and the resulting capacitance change is used to indicate material levels.
Applications
These controls are utilized across various industries such as food processing, petrochemical, and cement manufacturing for monitoring levels of non-conductive liquids and solids, particularly in silos for cereals and foodstuffs.
Sensitivity Adjustment
Sensitivity is adjusted using a potentiometer, initially set with the probe free from material and then adjusted when immersed. The potentiometer should be set midway between these two positions, with a min/max level security switch available for different control functions.
Limitations
Large deposits on the probe can affect measurements, though minimized by a Teflon coating. The dielectric constant of the material should differ significantly from 1, and factors like composition, humidity, and temperature should be considered.
General Characteristics
The devices are compact, integrating electronics and mechanics, with Teflon-coated steel electrodes and an IP65 protection rating for outdoor use.
Models with Separate Amplifier Gearbox
Available on request, these models include an internal oscillator transistor connected to an external amplifier for improved signal and sensitivity adjustment.
Technical Characteristics
Specifications include a supply voltage of 24Vac-110/220Vac±15% 50-60Hz, max absorption of 2.5VA, relay output of 5A at 220 Vac, IP65 rating, temperature limits from -20 to +60°C, aluminum housing, standard fixing of 1 ½ inch Gas, and max tank pressure of 12Kg/cmq.
Capacitive Sensors
These sensors use an oscillator influenced by capacitance changes when materials affect the sensor's active surface, suitable for level control of liquids, powders, and granules, and detecting metallic and non-metallic objects.
Sensitivity Adjustment for Sensors
Sensitivity should be adjusted in the operational position, considering humidity variations. The sensing range depends on material and object dimensions and can vary with temperature changes. Adjustment is done by rotating the trimmer after removing the protection screw.
Choosing a Capacitive Sensor
Selection should consider the material's form and composition. Non-embeddable models are recommended for a greater sensitive field, reducing susceptibility to temperature, humidity, and dust effects.
Proximity Capacitive Sensors SC Series
The SC series includes models with adjustable time delays for energization and de-energization, used in industrial applications, particularly in the food industry.
Available Range and Functions
Models like SC18SP-AE10 and SC30SP-AE25 offer various delay functions for both N.O. and N.C. contacts, with time delay adjustable via a trimmer.
Sensors Version C for Direct Voltage (4 Wires)
These sensors include an output amplifier and are protected against short circuits, polarity inversion, and inductive load disconnection peaks.
Sensors Version A for Alternating or Direct Voltage (2 Wires)
These sensors function with both AC and DC, featuring a mosfet output amplifier.
Sensors Version R with Relay (5 Wires)
These sensors operate with both AC and DC power supplies and include a relay for high load security.
Installation Instructions
Ensure the supply voltage matches the sensor's characteristics, use transformers with secondary voltage lower than the desired DC voltage, and filter the DC supply with adequate capacitance.
Specifications
Technical specifications include voltage requirements, wiring diagrams, and housing options. A capacitor of at least 470 µF for every 200 mA is recommended to filter the supply voltage Vdc.
Wiring Diagrams
Two wiring diagrams illustrate the connection of capacitive sensors with different voltage stabilizers and color-coded wiring instructions.
Application Examples
Applications include contact level control for solids or liquids, level control in containers, liquid flow control, automatic filling control, and presence counting and sorting of articles.
Technical Characteristics
Sensors are available in different models with specifications such as adjustable switching distance, voltage ratings, hysteresis, switching frequency, and temperature limits.
Models and Variants
Details various models of capacitive sensors, including 4-wire DC models, 2-wire AC models, and models with relay outputs.
Installation Instructions
Includes sensitivity adjustment and connection with connectors, IP ratings, and temperature limits for different models.
General Overview
Discusses high-temperature capacitive sensors, specifically models SC18M-HT and SC30M-HT, designed to withstand temperatures up to 250°C.
Technical Specifications
Features stainless steel AISI 303 housing and PTFE sensitive parts, with a standard cable length of 2m or 5m, capable of withstanding temperatures from -200 to +250°C.
Installation Instructions
For metallic containers, ensure they are earthed. For non-metallic containers, both the amplifier terminal and sensor body should be earthed.
Programmable Capacitive Sensor SC30P-RE25T
This model is programmable with delay functions for energization and de-energization, featuring a 1A 220V changeover relay.
Protection Housing SCM
The SCM protection housing is made of non-toxic plastic (POM) and is suitable for food applications, compatible with ATEX-approved capacitive sensors.
Contact Information
Aeco s.r.l., via G. Leopardi, 5 - 20065 Inzago (Milano) ITALY. Tel. ++39 02 954381 - Fax ++39 02 9548528. Email: [email protected]. Website: www.aecosensors.com
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Catalog excerpts

CAPACITIVE LEVEL CONTROLS-1

controlli di livello capacitivi capacitive levels controls

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CAPACITIVE LEVEL CONTROLS-2

CONTROLLI DI LIVELLO CAPACITIVI SERIE SCA - SCF CAPACITIVE LEVEL CONTROLS SCA - SCF SERIES WORKING PRINCIPLE Tale principio è basato sul comportamento fisico di un condensatore elettrico, la cui capacità dipende dall’area delle armature affacciate, dalla distanza fra di loro e dalla costante dielettrica del materiale interposto. Nel caso di controllo di livello capacitivo le armature del condensatore sono rappresentate dalle pareti del serbatoio da un lato e dall’elettrodo di una sonda dall’altro (isolato dalle pareti e che sporge all’interno dello stesso). Rimanendo costanti la superficie dell’elettrodo...

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CAPACITIVE LEVEL CONTROLS-3

CONTROLLI DI LIVELLO CAPACITIVI SERIE SCA - SCF CAPACITIVE LEVEL CONTROLS SCA - SCF SERIES CARATTERISTICHE GENERALI GENERAL CHARACTERISTICS Queste apparecchiature ad esecuzione compatta presentano la parte meccanica e la parte elettronica alloggiate in una unica unità. Sono fornite con elettrodi ad asta in acciaio (SCA) rivestiti in teflon con lunghezze standard 300/500/800mm oppure con elettrodi a fune (SCF) in acciaio plastificato ed elemento tenditore rivestito in teflon con lunghezze standard 1000/2000/3000/4000 mm facilmente accorciabili. Il corpo meccanico della sonda è in fusione di alluminio...

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CAPACITIVE LEVEL CONTROLS-4

SENSORI DI PROSSIMITÀ CAPACITIVI SERIE SC PROXIMITY CAPACITIVE SENSORS SC SERIES WORKING PRINCIPLE I sensori di prossimità capacitivi contengono un oscillatore a transistor situato nella parte anteriore. Il circuito oscillante R-C (resistenza-condensatore) viene influenzato dalla variazione di capacità, infatti quando un materiale qualsiasi solido o liquido (acqua, vetro, legno, metallo, caffé, polveri, ecc.) interessa la superficie attiva del sensore, la capacità aumenta mettendo in azione l’oscillatore fino ad invertire la soglia del trigger, inducendo un cambiamento di condizione dello stadio...

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CAPACITIVE LEVEL CONTROLS-5

SENSORI DI PROSSIMITÀ CAPACITIVI SERIE SC PROXIMITY CAPACITIVE SENSORS SC SERIES MODELLI AD INTERVENTO TEMPORIZZATO DELAYED MODELS Sono sensori capacitivi che forniscono il segnale di uscita al carico esterno con una temporizzazione regolabile alla eccitazione o alla diseccitazione con funzioni N.O. oppure N.C. Vengono forniti nei modelli diam. 18 e 30 mm ed in corrente alternata. Le gamme di temporizzazione disponibili sono le seguenti: 0 ÷ 1 min. / 0 ÷ 10 min. nei modelli diam. 18 e 30. Un trimmer di regolazione dei tempi, permette l’impostazione del tempo desiderato. Questi sensori possono...

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CAPACITIVE LEVEL CONTROLS-6

SENSORI DI PROSSIMITÀ CAPACITIVI SERIE SC PROXIMITY CAPACITIVE SENSORS SC SERIES SENSORI IN ESECUZIONE C PER CORRENTE CONTINUA (4 FILI) SENSORS VERSION Sono sensori amplificati in corrente continua che oltre all’oscillatore hanno incorporato anche l’amplificatore di uscita. Vengono forniti a 4 fili con funzione antivalente nelle versioni NPN o PNP. In questa esecuzione i sensori presentano come caratteristiche standard la protezione contro il corto circuito permanente del carico, sicurezza assoluta contro l’inversione di polarità e protezione ai picchi prodotti dal disinserimento dei carichi...

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CAPACITIVE LEVEL CONTROLS-7

CAPACITIVE SENSORS APPLICATION EXAMPLES SENSORI CAPACITIVI ESEMPI DI APPLICAZIONE CONTROLLO DI LIVELLO A CONTATTO DI MATERIALI SOLIDI O LIQUIDI CONTACT LEVEL CONTROL FOR SOLIDS OR LIQUIDS CONTROLLO DI LIVELLO ATTRAVERSO SERBATOI NON METALLICI LEVEL CONTROL FOR NON METALLIC CONTAINERS CONTROLLO PRESENZA MATERIALI SOLIDI O LIQUIDI ATTRAVERSO IMBALLI O CONTENITORI NON METALLICI SOLID OR LIQUID MATERIAL PRESENCE CONTROL WHICH ARE INSIDE PACKAGING OR NON METALLIC CONTAINERS CONTROLLO DI LIVELLO IN SERBATOI METALLICI ATTRAVERSO FINESTRELLA IN VETRO O PLASTICA LEVEL CONTROL FOR METAL CONTAINERS USING...

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CAPACITIVE LEVEL CONTROLS-8

SENSORI CAPACITIVI M18 x 1 • CAPACITIVE SENSORS M18 x 1 • CUSTODIA CILINDRICA PLASTICA O METALLICA • CYLINDRICAL HOUSING PLASTIC OR METALLIC • MODELLI 4 FILI IN C.C. - ESECUZIONE-C • 4 WIRES D.C. MODELS - VERSION-C TOTALMENTE SCHERMATI EMBEDDABLE (FLUSH MOUNTING) PARZIALMENTE SCHERMATI NOT EMBEDDABLE (NON FLUSH MOUNTING) CARATTERISTICHE TECNICHE TECHNICAL CHARACTERISTICS Dimensioni / Dimensions MODELLI CON CAVO MODELS WITH CABLE MODELLI CON CONNETTORE MODELS WITH CONNECTOR Tensione continua (ond. residua ≤ 10%) Continuous voltage (residual ripple ≤10%) Tensione alternata 50÷60 Hz Alternating...

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CAPACITIVE LEVEL CONTROLS-9

SENSORI CAPACITIVI M18 x 1 • CAPACITIVE SENSORS M18 x 1 • CUSTODIA CILINDRICA PLASTICA SC18SP O METALLICA SC18SM • CYLINDRICAL HOUSING PLASTIC SC18SP OR METALLIC SC18SM SC18SP • MODELLI 2 FILI IN C.A. - ESECUZIONE-A • 2 WIRES A.C. MODELS - VERSION-A • INTERVENTO ISTANTANEO O TEMPORIZZATO • STANDARD AND DELAYED MODELS Regolazione ritardo Regolazione ritardo 20 ÷ 250 (Valori massimi assoluti / absolute maximum ratings) ≤ 20 Max= 10 o in funzione del ritardo / In relation to delay 10 (Corrente minima di rilascio / min. release current) 1.5 Presente Incorporated Led giallo indicazione di stato -...

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CAPACITIVE LEVEL CONTROLS-10

SENSORI CAPACITIVI M30 x 1,5 • CAPACITIVE SENSORS M30 x 1,5 • CUSTODIA CILINDRICA PLASTICA SC30SP O METALLICA SC30SM • CYLINDRICAL HOUSING PLASTIC SC30SP OR METALLIC SC30SM • MODELLI 4 FILI IN C.C. - ESECUZIONE-C • 4 WIRES D.C. MODELS - VERSION-C TOTALMENTE SCHERMATI EMBEDDABLE (FLUSH MOUNTING) Regolazione sensibilità Sensitivity adjustment Regolazione sensibilità Sensitivity adjustment Led PARZIALMENTE SCHERMATI NOT EMBEDDABLE (NON FLUSH MOUNTING) CARATTERISTICHE TECNICHE TECHNICAL CHARACTERISTICS Cavo Cable Regolazione sensibilità Sensitivity adjustment Regolazione sensibilità Sensitivity adjustment...

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CAPACITIVE LEVEL CONTROLS-11

SENSORI CAPACITIVI M30 x 1,5 • CAPACITIVE SENSORS M30 x 1,5 • CUSTODIA CILINDRICA PLASTICA SC3OSP METALLICA SC30SM • CYLINDRICAL HOUSING PLASTIC SC30SP OR METALLIC SC30SM SC30SP 1 Regolazione sensibilità Sensitivity adjustment • INTERVENTO ISTANTANEO O TEMPORIZZATO • STANDARD AND DELAYED MODELS Regolazione sensibilità Sensitivity adjustment 17 Regolazione sensibilità Sensitivity adjustment Regolazione ritardo selezione NO/NC Delay setting NO/NC setting Attacco HM12 H Plug M12 Cavo Cable • MODELLI 2 FILI IN C.A./C.C. - ESECUZIONE-A • 2 WIRES A.C./D.C. MODELS - VERSION-A Regolazione sensibilità...

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.