Serie LMInterruttore di livello a ingresso laterale per impieghi gravosi
Interruttore di livello a galleggiante con ingresso laterale per uso industriale e minerario — stesso funzionamento collaudato della Serie L ma in un involucro di alluminio ricavato dal pieno con attacco al processo in acciaio inox 316. Galleggiante e braccio in polipropilene; microinterruttore S.P.D.T. 5–500 V AC, 15 A (LM-H) con forzatura manuale integrata, oppure microinterruttore a bassa tensione con contatti dorati (LM-L).
Caratteristiche
- Microinterruttore S.P.D.T. 5–500 V AC, 15 A (LM-H)
- Disponibile il modello a bassa tensione con contatti dorati (LM-L)
- Attacco al processo in acciaio inox 316
- Custodia in alluminio ricavato da pieno, estremamente robusta
- Comando manuale integrato
- Modelli da 1" BSP e 1" NPT disponibili
- Trascinamento magnetico senza guarnizioni
- Custodia IP67 resistente agli agenti atmosferici
- Facile da sottoporre a manutenzione
La Serie LM è costruita per un servizio gravoso e offre una soluzione affidabile e precisa per il controllo del livello nei serbatoi. Attacco al processo in acciaio inox 316 + involucro elettrico in alluminio ricavato dal pieno e lavorato a CNC + galleggiante e braccio in polipropilene. Il microinterruttore S.P.D.T. standard da 5 a 500 V (LM-H) è adatto a circuiti di controllo generali — ideale per avviatori di pompe, logica a relè, contattori e temporizzatori — mentre il microinterruttore S.P.D.T. a bassa tensione con contatti dorati (LM-L) è destinato a PLC, telemetria e controllo a bassa tensione. Forzatura manuale su tutti i modelli LM. La punta del braccio si muove di 45 mm da ciascun lato rispetto all’asse orizzontale; l’interruttore interviene a ±2° intorno all’orizzontale.
Ulteriori informazioni
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Application
The LM level switch has been designed to operate in water and sea water applications. The process connection is made from 316 stainless steel; the float and all other wetted parts are made from glass reinforced polypropylene.
Switching Point
Tip of the arm travels 45 mm each side of horizontal centre. Switching occurs ±2° around horizontal (2 degrees each side of the horizontal centre line), so the arm movement can be confined to within 3 to 4 degrees each side of horizontal and the switch will still operate properly.
Manual Override
All LM-H and LM-L models include a manual override button. Press to switch on regardless of float position — useful for testing and commissioning.
Installation
Install the switch in a tank socket on the side wall of a tank (or riser pipe), in the horizontal plane, with the float arm rising and falling vertically. It needs a minimum of 25 mm of clearance above and below its centre line axis for free movement of the float. The float passes through the inside diameter of a standard pipe thread socket, so the switch can be installed from the outside of the tank. Apply thread tape or sealant to the thread and screw the switch in using the spanner flats on the process adaptor — never by twisting the electrical housing — leaving a gap of approximately 4 mm between the end of the thread and the face of the tank socket. The cable entry must be on the underside of the switch, pointing straight down. Do not install the switch where the pressure is greater than the float rating of 980 kPa (100 metres head) or the liquid temperature is greater than 80 °C. Do not expose it to freezing (lag the tank and switch where low temperatures will be encountered), and do not use it in high temperature applications or in water hotter than 80 °C. The stainless body of the switch is rated to withstand 400 bar pressure; however, the float itself is only designed to withstand 100 metres head pressure (980 kPa or 142 psi).
Wiring and Earthing
The LM level switch is a mains voltage device: all electrical work must be performed by a fully qualified and licensed electrician. Check the part number on the label inside the lid before wiring, and confirm the load is within the electrical ratings — the LM-L switch is easily damaged by overload. The terminals are marked COM (common), NO (normally open) and NC (normally closed); for a two-wire connection use COM plus either NO or NC to suit the application. Connect the earth terminal inside the housing — the LM must be earthed when operated at mains voltage. Fully tighten the cable gland nut, check the lid gasket is in place and tighten the lid down: without its lid the switch is not water, weather or insect proof and presents a shock hazard that may cause death or serious injury.
Hazardous Areas
The LM-H 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). The LM-L is 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. It is not Ex certified in its own right. The associated apparatus must not exceed Uo ≤ 30 V, Io ≤ 100 mA. The full conditions of use are given in the installation sheet.
Replacing the Float Arm
The float arm and its associated pivot bearings are replaceable items. Spare assemblies can be obtained from your supplier — please quote the part number of the level switch when ordering. To remove the assembly, unscrew and remove the locking bolt on the side of the process adaptor (right-hand thread), pull the float arm assembly straight out without twisting it, and thoroughly clean the inside of the process adaptor. Replacement arm assemblies are supplied with new bearing shells and a large retaining O-ring: assemble the two bearing shells onto the arm (O-ring groove towards the long end of the arm), fit the large O-ring, align the flat face and location hole of the bearing shell with the locking bolt hole, and push the assembly all the way in to the dead stop. Check or replace the small O-ring under the locking bolt head, apply silicone grease or Vaseline to the bolt thread, then fit and fully tighten the locking bolt. Test the arm by pushing it up and down: it should swing freely and, when pushed to the up position, drop to the off position under its own weight when released.
Manutenibilità
Interamente riparabile sul campo. Una sola vite accessibile dall’esterno sgancia l’involucro elettrico dalla parte bagnata. Il braccio con galleggiante e i suoi cuscinetti del perno sono parti sostituibili: i gruppi braccio con galleggiante di ricambio sono disponibili presso il Suo fornitore — all’ordine indichi il codice dell’interruttore di livello. Galleggianti, guarnizioni e interruttori di ricambio sono disponibili presso Kelco Engineering o il Suo distributore.
