Serie P20Flussostato in linea resistente alla corrosione
Flussostato in linea semplice e affidabile per liquidi o gas in tubi e condotte di piccolo diametro. Rileva flussi continui o pulsanti, senza parti metalliche a contatto con il liquido — ideale per acqua di mare, acque sotterranee, acidi e soluzioni chimiche.
Caratteristiche
- Rileva flussi molto bassi (P20-B e P20-R si disattivano a 0.065 L/min)
- Nessuna parte metallica a contatto con il liquido
- Montaggio in qualsiasi posizione
- Facile da installare
- Elevata capacità di portata
- Pressione nominale 18 bar
- Perdita di carico molto bassa
- Rilevamento del flusso di liquidi o gas
- Portata di attivazione 0.14 L/min (P20-B e P20-R)
- Campo di pH del liquido da 1 a 14
- 3 moduli elettrici — uscite con interruttore reed o relè a stato solido
Il corpo del P20 contiene un pistone scanalato. Qualsiasi flusso spinge il pistone indietro all’interno del corpo finché il liquido lo supera ed esce dall’interruttore. Il pistone contiene un magnete che aziona un interruttore reed esterno attraverso la parete in polipropilene. Quando il flusso si arresta, un secondo magnete integrato nel corpo riporta il pistone nella posizione di riposo — un meccanismo a molla magnetica estremamente affidabile e a prova di corrosione. Montaggio in qualsiasi posizione (anche capovolto). Tre moduli elettrici offrono un’ampia scelta di opzioni di controllo. Il P20 standard è realizzato interamente in polipropilene rinforzato con fibra di vetro con guarnizioni O-ring in nitrile, ed è fornito completo di codoli e raccordi a bocchettone per il montaggio diretto in tubazioni in PVC o ABS.
Ulteriori informazioni
- Scheda tecnica Serie P20(versione in inglese)
- Istruzioni di installazione P20(versione in inglese)
- Guida agli interruttori reed(versione in inglese)
- Disegno al tratto P20 (DWG)
Selezioni il modello
Ordini — modelli disponibili
Limiti di funzionamento
Dimensioni
Warning: Electrical Safety
The P20 Series flow switch is a mains voltage device. Death or serious injury may result if this switch is not correctly installed and operated. All electrical work on this switch must be performed by a fully qualified and licensed electrician.
Pressure De-rating at Elevated Temperatures
The 1800 kPa max operating pressure applies at ambient. Maximum operating pressure must be de-rated linearly with temperature, to a maximum of 1 bar absolute at 80 °C. Use this switch at elevated temperatures only in non-pressurised systems open to atmosphere.
All-Position Mounting
The P20 can be mounted in any orientation in pipework, including upside-down, with no adverse effects — the magnetically-sprung piston (rather than gravity) returns it to the off position when flow stops. There is a direction of flow arrow on the switch body; the switch will not operate against a reversed flow. Pipework can be used to support the switch, or the switch can be connected directly into valve manifolds or pump ports.
Liquid or Gas Flow
The P20 can detect the flow of liquids or gases, including vapour flow. Maximum temperature is 80 °C, and at 80 °C the operating pressure must not exceed 1 bar absolute.
Clean Fluid & Line Filtration
The P20 contains a close fitting piston and should only be used where the process fluid is reasonably clean and free of entrained or suspended material. Fluids containing large particulate matter, ferrous materials or fibrous matter should not be used in this switch. If the degree of contamination of the process fluid can’t be guaranteed, fit suitable line filtration upstream of the P20.
Pressure Limits & Water Hammer
Do not use the P20 where the line pressure exceeds 18 bar. In the interest of safety the switch has a burst pressure rating of >97 bar. Take care not to expose the switch to excess pressures such as may be generated by water hammer.
Materials & Housing
The standard P20 is made entirely from glass reinforced polypropylene with nitrile O-ring seals. The piston return and the electrical switching action use high power magnets operating through the solid body of the switch. The electrical housing is hose-proof and weatherproof to IP67 — dust tight, protected against temporary immersion and suitable for all outdoor exposed applications — with a built-in 20 mm cable gland for conduit or flexible cable entry (flexible cable up to 10 mm diameter, or a 20 mm conduit bush with the gland nut removed). Protect the switch from freezing.
Lid & Cable Gland
After installing or servicing, always replace the lid and fully tighten its lid screw and the cable gland. Never leave the lid off for extended periods: without its lid the switch is not water resistant or weather and insect proof and presents a potential shock hazard.
Typical Applications
Constant pressure pump control, loss of prime pump protection, water treatment control, irrigation control, chemical dosing systems, gland cooling systems and industrial process control.
Hazardous Areas
The P20-B and P20-C are simple apparatus under AS/NZS 60079.11 and may be used in a hazardous area only as part of an intrinsically safe circuit, connected through suitably certified associated apparatus. They are not Ex certified in their own right. The full conditions of use are given in the installation sheet. The P20-R is not certified for use in hazardous areas and must not be installed in any area classified as hazardous under AS/NZS 60079.10 (Zone 0, 1, 2, 20, 21 or 22).
Manutenibilità
Completamente riparabile sul campo. Le schede elettroniche sono intercambiabili e tutte le parti del P20 sono disponibili come ricambi; molte parti sono intercambiabili, consentendo di configurare l’interruttore su misura. Kit di ricambio e guarnizioni sono disponibili presso Kelco Engineering o il Suo distributore.
