Série KPChave de nível tipo sonda (boia vertical)

Chave de boia tipo sonda compacta de orientação vertical — corpo externo de 25 mm de diâmetro encaixa em tubulação ou poço de 25,4 mm. Carcaça em UPVC ventilada com boia interna em polipropileno. Repetibilidade de comutação ±1 mm; ideal como alternativa às sondas de condutividade em bombas submersíveis de poço.

Série KP

Recursos

  • Sem peças móveis externas
  • Construção sólida e confiável
  • Reed switch S.P.D.T. de três fios
  • Construção em PVC, polipropileno e fluorossilicone
  • Ação de comutação estável e repetível
  • Sem componentes de mercúrio ou chumbo
  • Diâmetro compacto de 25 mm — encaixa em tubulação / poço de 25,4 mm
  • Repetibilidade de comutação de ±1 mm
  • Submersão máxima de 45 m (pressão estática de 450 kPa)
  • pH 1–14, partes molhadas em UPVC e polipropileno
  • Contrapesos de cabo opcionais disponíveis

A chave de nível tipo sonda KP consiste em uma carcaça de UPVC ventilada contendo uma boia de polipropileno. O nível crescente do líquido levanta a boia e aciona um reed switch acoplado magneticamente dentro da cabeça da chave; um nível em queda deixa a boia descer, desativando o reed switch. A cabeça do sensor é usinada em CNC a partir de UPVC maciço e é totalmente encapsulada. A chave é um reed switch de contato seco unipolar bidirecional de alta complacência, que pode comutar até 140 V CA ou 150 V CC com correntes de até 0,25 A em carga resistiva, até o máximo de 5 W / VA. Não é adequada para uso em tensão de rede: é um dispositivo de sinalização de baixa tensão para entradas de BMS e CLP, e uma alternativa às sondas de condutividade em instalações de bombas submersíveis de poço. Deve ser instalada na vertical, com o cabo na parte superior.

Selecionar modelo

Pedido — Modelos disponíveis

ModeloDescrição
KP-10KP probe switch — 10 m of CPE cable (the only length available)

Limites de operação

Maximum submergence45 m / 450 kPa static pressure
Minimum burst pressure3500 kPa or 350 m static pressure
Maximum liquid temperature50 °C
Minimum liquid temperature-1 °C
Liquid specific gravity> 0.9
Liquid pH range1 to 14
Smallest hole/well diameter25.4 mm internal diameter, vertically oriented
Liquid level change for switch to operate5 mm (on to off or off to on)
Closest switching point to tank floor80 mm
Smallest opening through which the switch will fit25.4 mm diameter
Suitability — sea waterFully compatible
Suitability — potable waterFully compatible
Switching repeatability±1 mm liquid level change
Mounting orientationMust be installed within 5° of vertical

Dados elétricos

Switch typeDry contact reed switch
Contact formS.P.D.T. (single-pole double-throw) C-form, break-before-make
Maximum switched voltage140 VAC / 150 VDC
Maximum switched current0.25 A
Maximum switched power5 W / VA — IMPORTANT: the product of switching voltage and current must never exceed 5 W
Carry current1 A max
Breakdown voltage200 VDC minimum
Typical applicationsPLC, telemetry & general low voltage control

Dimensões

Dimensões Série KP
Vertical probe — 173 mm long, 25 mm diameter body, 21.5 mm diameter at the cable end, 7 mm diameter cable.

Typical Applications

Deep-well bore-pump protection (borehole installations); saline-water service; withstands most common chemicals; chemical-tank monitoring; bilge-level control; high & low level alarms; intrinsically safe circuits (simple apparatus); general-purpose liquid-level sensing.

Hazardous Areas

The KP 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 full conditions of use are given in the installation sheet.

Safety — Low Voltage Only

The KP probe level switch is not suitable for use at mains voltage and must never be used in mains voltage applications. It is a low voltage signalling device for low voltage, low current applications only, and is ideal as an input device for BMS and PLC applications. Its reed switch suits low wetting current, low voltage control such as PLC and BMS control at 24 V, 3.3 V and 5 V, signalling and telemetry, and relay logic circuits. It is not suitable for switching inductive loads such as high wattage relays, motors of any kind or contactors. The contact power rating is the product of switching voltage and current and must never exceed 5 Watts / VA.

Mounting — vertical only

The KP probe MUST be installed vertically (within 5 degrees of vertical) with its cable at the top. It will not operate in any other orientation. It does not need to float or tilt to operate; its float is contained within the vented UPVC housing. Four mounting methods: (A) a rigid probe assembly made from 15 NB PVC pressure pipe and a PVC socket, fixed to a wall with the 15 NB pipe saddles supplied with the switch; (B) strapped to suitable pipework with standard cable ties, using the locating trenches in the KP body; (C) suspended vertically in a pit or tank, with a Kelco KCW cable weight fitted to the cable to hold the switch in place if required; (D) bolted to the side wall of a pit or tank using the 15 NB wall clips provided with the switch. The 15 NB probe assembly protects the cable from mechanical and chemical damage. Avoid violent turbulence and any place where the switch or cable can abrade against adjacent objects.

Magnet — Ferric and Iron Particles

The KP probe switch contains a magnet. Do not use it in applications involving ferric solutions such as ferric chloride, or liquids containing suspended iron particulates: iron sludge may agglomerate around the magnet and prevent the free movement of the float.

Cable Data

S05RN-F 3 × 0.75 mm² cable: black CPE (chlorinated polyethylene) outer sheath, fluorosilicone cable boot, EPR insulation, 3 × 24/0.2 mm plain copper (0.75 mm²), 7.0 ± 0.2 mm diameter, core colours blue (common), black (normally closed) and brown (normally open), voltage rating 300 / 500 V, test voltage 2000 V / 2500 V, minimum bending radius 6 × overall diameter (42 mm), conductor operating temperature -30 °C to +60 °C (85 °C max), CENELEC HD 22.4 S4 & VDE 0282-4/2005, conductor resistance 26.7 Ω/km max per core (20 °C), cable current rating 6 A max (switch ratings apply), maximum suspended length approx. 45 m free-hanging cable. The cable is 10 m only; no other lengths are available. Blue to brown closes and blue to black opens as the liquid level rises.

Manutenção

O KP pode ser desmontado para limpeza, se necessário. Conjuntos de sonda de reposição disponíveis na Kelco Engineering ou no seu distribuidor.

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