Série D50Chave de nível de líquido de duas posições

Regulador de nível de duas posições com entrada pelo topo em um único cordão suspenso — dois deslocadores sólidos com trava giratória definem os pontos de comutação alto e baixo, com diferencial de nível de 115 mm no mínimo a 20 m no máximo. Chave S.P.D.T. de 20 A, com capacidade até 500 V CA (classificação de motor UL 2 HP a 250 V CA), em carcaça totalmente metálica para serviço pesado, à prova de intempéries.

Recursos

Controle de nível alto e baixo com boia para tanques e poços
Chave S.P.D.T. de 20 A com capacidade até 500 V CA; classificação de motor UL 2 HP a 250 V CA
Sem peças metálicas em contato com líquidos
Carcaça totalmente metálica para serviço pesado, à prova de intempéries
Ação magnética super confiável
Dois suportes de montagem fornecidos (parede + ângulo reto)
Diferencial de nível mínimo de 115 mm (deslocadores empilhados juntos), até 20 m de diferencial de nível máximo
Os deslocadores com trava giratória definem os pontos de comutação alto e baixo em qualquer ponto do cordão
Temperatura máxima do líquido de 90 °C (deslocadores e cordão)
Os poços podem ser esvaziados por bombeamento até 20 mm do piso

O D50 carrega dois deslocadores não flutuantes de polipropileno reforçado com fibra de vidro em um cordão de suspensão de polipropileno virgem (3 m fornecidos; cordões de até 20 m disponíveis). Trave por rotação os deslocadores em qualquer ponto do cordão para definir os pontos de comutação alto e baixo (por ex. baixo no fundo de um tanque, alto perto do topo). Um nível em queda dispara quando o deslocador inferior fica parcialmente descoberto; um nível em subida reinicia quando o deslocador superior fica coberto em dois terços. Agitação superficial, espuma e sólidos flutuantes ou submersos não afetam a ação. A chave pode ser montada em qualquer local acima do líquido a ser detectado. Projetado para detectar uma variação de nível em líquidos com SG de 0,95 a 1,0, ou seja, água ou água que contenha sólidos dissolvidos ou em suspensão. Para água doce e águas residuais; não indicado para água do mar nem produtos químicos.

Mais informações

Brochura do D50
Folha de instalação do D50
Folha de recalibração do D50(versão em inglês)
Download do desenho 3D do D50 (arquivo .stl)

Pedido — Modelos disponíveis

Modelo	Descrição
D50	D50 two-position level switch — two displacers, 3 m of polypropylene cord (up to 20 m available), wall mounting plate and right-angle mounting bracket supplied

Limites de operação

Minimum level differential	115 mm with the 2 displacers stacked close together
Maximum level differential	20 metres (3 metres of cord is supplied with the switch)
Minimum distance from switch point to floor of a tank or sump	20 mm (sumps can be pumped out to within 20 mm of the floor)
Maximum liquid temperature	90 °C (displacers and cord only can withstand this temperature)
Specific gravity of process liquid	> 0.95 (water at ambient temperature)
Ingress protection rating	IP56 and IP68 to 1 metre submergence

Dados elétricos

Switch type	S.P.D.T. (single pole, double throw) switch, suitable for all general control circuit applications up to 500 VAC. Ideal for the control of pump starters, relay logic circuits, and for the direct control of contactors and timers
Switch rating	Rated to 500 VAC: 20 A resistive (15 A at 500 VAC)
Motor load rating	Motor load ratings 12.5 A at 125 VAC, 8.3 A at 250 VAC and 2 A at 500 VAC (UL: 1 HP at 125 VAC, 2 HP at 250 VAC)
Maximum switched voltage	500 VAC
Maximum switched current	20 A (15 A at 500 VAC)
Resistive load rating (NC and NO)	20 A at 125 VAC; 20 A at 250 VAC; 15 A at 500 VAC; 20 A at 8 VDC; 20 A at 14 VDC; 6 A at 30 VDC; 0.5 A at 125 VDC; 0.25 A at 250 VDC
Lamp load rating	7.5 A at 125 VAC; 7.5 A at 250 VAC; 4 A at 500 VAC; at 8 VDC, 14 VDC and 30 VDC: 3 A NC / 1.5 A NO; at 125 VDC: 0.5 A NC / 0.5 A NO; at 250 VDC: 0.25 A NC / 0.25 A NO
Inductive load rating (NC and NO)	20 A at 125 VAC; 20 A at 250 VAC; 10 A at 500 VAC; 20 A at 8 VDC; 15 A at 14 VDC; 5 A at 30 VDC; 0.05 A at 125 VDC; 0.03 A at 250 VDC
Motor load rating (NC and NO)	12.5 A at 125 VAC; 8.3 A at 250 VAC; 2 A at 500 VAC; 12.5 A at 8 VDC; 12.5 A at 14 VDC; 5 A at 30 VDC; 0.05 A at 125 VDC; 0.03 A at 250 VDC
Contact loading note	Do not apply maximum voltage at maximum current across the switch contacts. See the load ratings above for current limits at specific voltages and for specific loads
Terminal identification	COM 1 (common), NC 2 (normally closed), NO 3 (normally open). To pump out of a tank use terminals 1 (COM) and 3 (NO); to pump into a tank use terminals 1 (COM) and 2 (NC)
Cable gland	M20 cable gland; cable 10 mm dia. maximum; two cable crimps supplied to suit various cable sizes
Earthing	M4 earth screw provided inside the lid

Dimensões

Typical Applications

Level control in confined or tight locations; pump-in or pump-out applications; water-tank level control; effluent and liquid-waste level control; slurry and high-solids services; fresh water and waste water (not for sea water or chemicals); sumps, pits, bores, tanks, wells or bunds.

Adjustable Switching Points

The displacers are twist-locked onto the cord, so the high and low switching points can be set anywhere along the cord at installation. Set the bottom one near the lowest acceptable level (pump-out cut-off / fill-start), and the top one near the highest acceptable level (overflow alarm / fill-stop). The minimum level differential is 115 mm (displacers stacked close together) and the maximum is 20 metres; 3 m of cord is supplied and cords up to 20 m are available from Kelco or your supplier.

Fitting the Displacers

Assemble each displacer on the cord: thread the cord through the three components, lay it in the trench in the anvil, slide the anvil into the top body half, screw the two body halves together and tie a knot in the free end of the cord. Position the displacers with their conical ends pointing upwards, one at the required high level switching point and one at the low level switching point, then twist and lock them onto the cord. Keep the bottom displacer clear of the floor of the pit or tank, and both displacers well clear of any inlet or outlet pipes and of the floor by at least 20 mm.

Installation and Mounting

A flat mounting plate is supplied for installing the switch against the walls of pits or tanks, plus an angle bracket for mounting on any flat horizontal surface such as tank lids or horizontal bracing. M5 threaded mounting holes in the sides of the switch body let the cable entry point to the right or left. Whichever bracket is used, the top face of the lid must be perfectly horizontal (in both planes) so the cord and displacers hang vertically beneath the switch. The slotted angle bracket suits sloping beams and tank lids and can be inverted if required; fully tighten the 2 × M5 Phillips head screws. Thread the cord through the hole at the end of the actuating arm and tie a double knot in it.

Operating Environment

Controls the level of liquid in wells, tanks, pits, sumps and bores, in potable water, distilled water or water that contains solids, pulp, froth, foam, grit or waste materials. It is not suitable for sea water or chemical solutions. The weatherproof electrical housing is normally mounted above the liquid, with the displacers suspended on the cord at the points where rising or falling levels are to operate the switch. The suspension cord and displacers are the only parts in contact with the liquid and are made from polypropylene.

Exposed Applications

If the switch is mounted in an outside location, for example on top of an open water tank, protect the cord, displacers and electrical lead from direct exposure to the sun. A simple shroud can be made from a length of 50 mm or larger PVC pipe stood on end in the tank, with the D50 mounted so its displacers and cord sit inside the open pipe. The electrical lead can be protected by running it through a length of flexible conduit.

Wiring and Earthing

The D50 is a mains voltage device: all electrical work must be performed by a fully qualified and licensed electrician. To pump out of a tank, use terminals 1 (COM) and 3 (NO). To pump into a tank, use terminals 1 (COM) and 2 (NC). Crimp one of the two supplied cable crimps onto the cable's outer sheathing at least 5 mm back from its end, pull it hard against the inner wall of the M20 gland, then fully tighten the gland (cable 10 mm dia. maximum). An M4 earth screw is provided inside the lid and all applications should be properly earthed.

Calibration

Each D50 is factory calibrated to operate with the two displacers supplied. If required, re-calibrate using the M3 Allen head stainless grub screw (secured with a lock nut) on the top deck of the switch. If the switch fails to operate on a falling level (does not switch when the falling level uncovers the bottom displacer), unlock the lock nut, turn the calibration screw ¼ turn anti-clockwise, re-lock and test; if it still fails, turn a further ¼ turn anti-clockwise and repeat. If it fails to operate on a rising level (does not switch when the top displacer is covered), unlock the lock nut, turn the screw ¼ turn clockwise, re-tighten and test; if it still fails, turn a further ¼ turn clockwise and repeat.

Hazardous Areas

The D50 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).

Manutenção

Totalmente sujeito a manutenção em campo. Deslocadores, cordão e módulos de chave de reposição disponíveis na Kelco Engineering ou no seu distribuidor.