Série KUChave de boia para diesel e óleo

Variante da série K resistente a diesel e óleo — mesma boia compacta de 75 mm com ação de inclinação, mas com cabo de poliuretano laranja fabricado para controle de nível de ponto único em óleos. NÃO adequada para aplicações com água ou esgoto.

Série KU

Recursos

  • Para aplicações com diesel e óleo (não para água ou esgoto)
  • Construção robusta de moldagem dupla
  • Cabo de poliuretano laranja de 3 condutores
  • Carcaça em polipropileno
  • Baixo diferencial de comutação
  • Ação de inclinação em todas as direções
  • Comutação estável e repetível
  • Tamanho compacto, diâmetro de 75 mm
  • Contrapeso de cabo opcional disponível
  • Comprimentos de cabo de 1–20 m (1 / 4 / 6 / 10 / 20 m)
  • Submersão máxima de 30 m, temperatura máxima do líquido de 60 °C

A série KU usa a mesma boia com ação de inclinação a 45° da série K, mas com cabo de poliuretano laranja de três condutores (H05BQ-F) fabricado especialmente. É uma chave de boia compacta de três fios projetada para controle de nível de ponto único em óleos, e sua capacidade de resistir a óleos a torna adequada para controle de nível em tanques de diesel e em aplicações envolvendo diesel ou óleo a granel. Uma esfera pesada equilibrada no braço de acionamento de uma chave de alta precisão se afasta do eixo da chave quando a boia se inclina, de modo que a boia precisa apenas se inclinar 45° em qualquer direção para que a chave opere. Boia de polipropileno com câmara de moldagem dupla hermeticamente selada e uma barreira de moldagem dupla de polipropileno maciço vedando a entrada do cabo; a corrente de carga é limitada a 6 A pelo cabo de 0,75 mm². Por segurança, opere somente em baixa tensão (12–48 V CA ou CC).

Selecionar modelo

Pedido — Modelos disponíveis

ModeloDescrição
KU1MKU Series float switch — 1 m of polyurethane cable
KU4MKU Series float switch — 4 m of polyurethane cable
KU6MKU Series float switch — 6 m of polyurethane cable
KU10MKU Series float switch — 10 m of polyurethane cable (most common)
KU20MKU Series float switch — 20 m of polyurethane cable

Limites de operação

Maximum submergence30 m / 300 kPa static pressure
Maximum liquid temperature60 °C
Minimum liquid temperature-20 °C
Liquid specific gravityGreater than 0.8
Liquid pH range1 to 14
Smallest tank diameter300 mm inside diameter
Liquid level change for switch operation75 mm
Closest switching point to tank floor100 mm
Minimum distance from float to closest tether/weight200 mm

Dados elétricos

Switch typeSingle pole double throw (S.P.D.T.), silver alloy contacts, 0.5 mm gap
Contact resistance15 milliohms maximum (initial)
Rated voltage (switch contacts)125, 250 and 500 VAC; 8, 14, 30, 125 and 250 VDC
Operating voltage (safety note)Only ever operate at low voltage: 12–48 V AC or DC
Resistive AC current rating15 A at 250 VAC, 15 A at 125 VAC (10 A at 500 VAC)
Motor load AC current ratingNO 2.5 A / NC 5 A at 125 VAC (⅛ HP); NO 1.5 A / NC 3 A at 250 VAC (¼ HP)
Resistive DC current rating15 A at 8 and 14 VDC, 6 A at 30 VDC, 0.5 A at 125 VDC, 0.25 A at 250 VDC
Maximum lamp load ACNO 1.25 A / NC 2.5 A at 250 VAC
Maximum lamp load DCNO 1.5 A / NC 3 A at 30 VDC
Minimum operating load160 mA at 5 VDC
Low-current inputsThe 160 mA at 5 VDC minimum is the microswitch manufacturer's rating for guaranteed contact at very low currents. KU Series switches are also used on PLC, BMS and 24 VDC control inputs. For a dedicated low-current signal input, the KP-10 reed probe and the L-L side-entry switch (gold contacts) are designed for that duty.
Maximum operating frequency, electrical20 operations per minute
Dielectric strength between contacts1000 VAC, 50/60 Hz for 1 minute
Dielectric strength to ground2000 VAC, 50/60 Hz for 1 minute
Insulation resistance100 megohms minimum (at 500 VDC)
Mechanical life expectancy10 000 000 operations minimum
Electrical life expectancy500 000 operations minimum
Approved standardsUL1054 E41515, CSA C22.2 No. 55 (File No. LR21642)
Product load current6 A maximum (limited by the 0.75 mm² cable)

Dimensões

Dimensões Série KU
Cable-suspended diesel/oil pendant float — 75 mm diameter × 109 mm tall teardrop float, 150 mm minimum from cable tether/weight to float, with orange polyurethane cable in 1 / 4 / 6 / 10 / 20 m lengths. 3-core cable: blue (common), black (NC), brown (NO).

Diesel & Oil Service Only

The KU is built specifically for oil and diesel service — the polyurethane cable resists swelling, hardening and cracking in diesel and oil. It is intended for use in oil and diesel applications only and is NOT suitable for use in water or sewage applications; use a K Series for those.

Typical Applications

Diesel fuel and oil tanks; high and low level alarms; alarms, pump control (direct or through a contactor or relay), and PLC / BMS inputs.

Safety — Low Voltage Only

In the interests of safety the KU Series should only ever be used with control voltages in the range of 12 to 48 volts AC or DC. All electrical work must be carried out by a qualified, licensed electrician in line with AS/NZS (or equivalent) standards and local wiring rules.

Hazardous Areas

The KU Series 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).

Operating Environment

Do not use the KU in closed vessels above 300 kPa static pressure or in submerged applications deeper than 30 m. Do not expose it to liquid temperatures below -20 °C or above 60 °C; the switch and cable will withstand temperatures outside these limits but service life may be reduced. In liquids of low specific gravity the buoyancy of the float is reduced and a proportionally higher operating differential results.

Mounting and Wiring

Avoid turbulence and any place where the float or cable will abrade against tank walls, piping or pumps, and keep the cables of adjoining switches from rubbing or tangling. Suspend the switch at least 100 mm away from tank walls and stand pipes. Never tie the float against a pipe or the side of the tank: it must be free to tilt and return to vertical. Keep exposed cable out of direct sunlight: terminate it in a junction box or run it in conduit rather than draping it over the tank rim. With the float hanging vertically the core colours are blue (common), black (normally closed) and brown (normally open); when the level rises and tilts the float 45°, blue to brown closes and blue to black opens. Most installations use only the blue common and one other wire; the unused wire is live when the switch actuates and must always be isolated. Two float switches controlling the high and low levels of a tank or pit normally use a latching circuit, for pumping out of or into the tank.

Cable Properties

H05BQ-F 3G0.75 mm² (KEMA-KEUR) cable: three cores of 22/0.2 mm copper, EPR insulation (2.4 ± 0.1 mm), core colours blue, brown and black, orange thermoplastic polyurethane (TMPU) outer sheath (RAL 2003), 7.25 ± 0.2 mm diameter, voltage rating 300/500 V, test voltage 2000 V / 2500 V, temperature range -50 °C to +90 °C fixed installation and -40 °C to +80 °C in motion, maximum conductor temperature 90 °C (200 °C short circuit), abrasion, cut and tear resistant, flexible at low temperatures, conductor resistance 26.0 Ω/km max. per core at 20 °C, cable current rating 6 A max. (cable limited), maximum suspended length approx. 50 m (cable only). Cable lengths available: 1, 4, 6, 10 and 20 m. The cable is also described as polyester-based, halogen-free, with high flexural fatigue strength, and resistant to oils, fats and mild acids.

Manutenção

Unidade selada — não sujeita a manutenção interna pelo usuário. Comprimentos de cabo de reposição disponíveis na Kelco Engineering ou no seu distribuidor.

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