Série FChave de fluxo de palheta resistente à corrosão

Chave de palheta robusta e altamente sensível para líquidos quentes e frios. Acionamento por repulsão magnética (sem vedações, diafragmas ou foles) resulta em uma chave de alta pressão sem pontos de falha potencial. Conexão de processo em polipropileno ou inox 316; 3/4" ou 1" BSP/NPT.

Recursos

Chave S.P.D.T. 5–500 V CA, 15 A (modelo F-H)
Modelo «L» de baixa tensão com contatos de ouro disponível (F-L)
Modelos em polipropileno ou inox 316
Chaves disponíveis com roscas 3/4" e 1" BSP e NPT
Override manual integrado (modelos F-H e F-L)
Construção modular — remova a carcaça, ou desparafuse a chave da tubulação, sem mexer na fiação
Modelos de alta pressão 400 bar / 5800 psi disponíveis (inox)
Acionamento magnético sem vedações
Carcaça à prova de intempéries IP67
Fácil manutenção

A carcaça elétrica é um conjunto separado travado na parte úmida por um único parafuso acessível externamente, de modo que pode ser removida para manutenção — ou a chave pode ser desparafusada da tubulação — sem mexer na fiação. Toda chave da série F é fornecida com uma palheta de polipropileno reforçado com fibra de vidro que pode ser cortada e moldada para tubulações de 25 mm (1") e maiores. Um override manual integrado liga a unidade ao pressionar um botão, independentemente do fluxo, de modo que as bombas podem ser acionadas manualmente a qualquer momento e os testes e o comissionamento ficam simples. Disponível com conexão de processo de alta pressão em polipropileno ou em aço inoxidável 316, com modelos para a maioria das aplicações, incluindo água do mar, água de poço, ácidos, álcalis e muitas soluções químicas.

Mais informações

Folha de dados da série F
Folha de instalação da série F-H
Folha de instalação da série F-L (baixa tensão)
Instalando em um afastamento? Verificação de afastamento
Modelos CAD 3D (6 modelos, STEP)
Modelos externos simplificados para layout e montagem; não destinados à fabricação.
- F-H-25B8.6 MB
- F-H-25B-SS7.2 MB
- F-H-25N8.3 MB
- F-L-25B8.6 MB
- F-L-25B-SS7.2 MB
- F-L-25N8.3 MB

Como a palheta da série F reage ao fluxo

Carregando o modelo 3D…

Pedido — Modelos disponíveis

Modelo	Descrição
F-H-25B	Standard heavy-duty S.P.D.T. switch (H), 1" BSP thread, all polypropylene wetted parts
F-H-25N	Standard heavy-duty S.P.D.T. switch (H), 1" NPT thread, all polypropylene wetted parts
F-H-25B-SS	Standard heavy-duty S.P.D.T. switch (H), 1" BSP thread, high-pressure 316 stainless steel process connection + polypropylene paddle
F-H-25N-SS	Standard heavy-duty S.P.D.T. switch (H), 1" NPT thread, high-pressure 316 stainless steel process connection + polypropylene paddle
F-H-20B-SS	Standard heavy-duty S.P.D.T. switch (H), 3/4" BSP thread, high-pressure 316 stainless steel process connection + polypropylene paddle (3/4" is stainless only; no polypropylene 20 mm option)
F-H-20N-SS	Standard heavy-duty S.P.D.T. switch (H), 3/4" NPT thread, high-pressure 316 stainless steel process connection + polypropylene paddle (3/4" is stainless only; no polypropylene 20 mm option)
F-L-25B	Low-voltage gold-contact model (L) — S.P.D.T. switch with gold contacts, 1" BSP thread, all polypropylene wetted parts
F-L-25N	Low-voltage gold-contact model (L) — S.P.D.T. switch with gold contacts, 1" NPT thread, all polypropylene wetted parts
F-L-25B-SS	Low-voltage gold-contact model (L) — S.P.D.T. switch with gold contacts, 1" BSP thread, high-pressure 316 stainless steel process connection + polypropylene paddle
F-L-25N-SS	Low-voltage gold-contact model (L) — S.P.D.T. switch with gold contacts, 1" NPT thread, high-pressure 316 stainless steel process connection + polypropylene paddle
F-L-20B-SS	Low-voltage gold-contact model (L) — S.P.D.T. switch with gold contacts, 3/4" BSP thread, high-pressure 316 stainless steel process connection + polypropylene paddle (3/4" is stainless only; no polypropylene 20 mm option)
F-L-20N-SS	Low-voltage gold-contact model (L) — S.P.D.T. switch with gold contacts, 3/4" NPT thread, high-pressure 316 stainless steel process connection + polypropylene paddle (3/4" is stainless only; no polypropylene 20 mm option)

Limites de operação

Maximum operating pressure (all-polypropylene model, ambient)	18 bar / 261 psi (de-rate linearly with temperature — at 60 °C / 140 °F the maximum permissible pressure does not exceed 1 bar / 15 psi absolute)
Maximum operating pressure (stainless steel model, ambient)	400 bar / 5800 psi
Minimum burst pressure (all-polypropylene)	45 bar / 652 psi
Minimum burst pressure (stainless steel)	500 bar / 7215 psi
Maximum operating temperature (all-polypropylene)	60 °C / 140 °F (see pressure de-rating note)
Maximum operating temperature (stainless steel)	80 °C / 176 °F
Minimum operating temperature (both models)	-20 °C / -4 °F
Ingress protection rating	IP67

Dados elétricos

F-H switch type	S.P.D.T. (single pole, double throw) microswitch for general control circuits up to 500 V AC — use at any voltage from 5 to 500 V AC (minimum load 160 mA at 5 V DC). Absolute limits: 500 V AC maximum; 15 A maximum (10 A at 500 V AC). Maximum voltage and maximum current cannot be applied together.
F-H typical applications	Pump starters, relay logic, contactors and timers
F-H resistive load rating (NC / NO)	15 A at 125 V AC and 250 V AC; 10 A at 500 V AC; 15 A at 8 V DC and 14 V DC; 6 A at 30 V DC; 0.5 A at 125 V DC; 0.25 A at 250 V DC
F-H lamp load rating (NC / NO)	3 A / 1.5 A at 125 V AC; 2.5 A / 1.25 A at 250 V AC; 1.5 A / 0.75 A at 500 V AC; 3 A / 1.5 A at 8, 14 and 30 V DC; 0.5 A / 0.5 A at 125 V DC; 0.25 A / 0.25 A at 250 V DC
F-H inductive load rating (NC / NO)	15 A at 125 V AC and 250 V AC; 6 A at 500 V AC; 15 A at 8 V DC; 10 A at 14 V DC; 5 A at 30 V DC; 0.05 A at 125 V DC; 0.03 A at 250 V DC
F-H motor load rating (NC / NO)	5 A / 2.5 A at 125 V AC; 3 A / 1.5 A at 250 V AC; 1.5 A / 0.75 A at 500 V AC; 5 A / 2.5 A at 8, 14 and 30 V DC; 0.05 A / 0.05 A at 125 V DC; 0.03 A / 0.03 A at 250 V DC
F-H direct motor control	Directly switches pump motors up to 1/4 HP (approx. 185 W) at 240 V AC. For larger motors use a contactor or relay.
F-RL (retired) switch type	Dry-contact reed switch S.P.D.T. break-before-make — 20 W / VA max, 140 V AC / 150 V DC, 1 A max, 200 V breakdown
F-RL (retired) typical applications	PLC input, telemetry signaling, low-voltage relay logic
F-L switch type	Gold contact microswitch, S.P.D.T., gold alloy contacts, so it switches reliably at the low wetting currents of PLC inputs, telemetry and relay logic. Not suitable for inductive or capacitive loads such as contactors and relays. Loads above the rating will damage the switch.
F-L rated current (resistive)	0.1 A at 125 VAC; 0.1 A at 8, 14 and 30 VDC
F-L inrush current	0.1 A maximum (NC and NO)
F-L minimum applicable load	1 mA at 5 VDC
F-L operating range (micro load)	5 to 30 V, 5 to 800 mW (26 mA maximum at 30 V)
F-L contact resistance	50 mΩ maximum (initial)
F-L typical applications	PLC, telemetry and low voltage control

Dimensões

Manual Override (F-H and F-L models)

All F-H and F-L models include a red manual override button on the side of the housing, under the cable gland. Pressing the button switches the flow switch on regardless of flow — useful for manually starting pumps in spite of an initial lack of flow, and for testing/commissioning of control circuits. After wiring, press it to test: the switch changes state as if liquid were pushing the paddle.

Flow Sensitivity & Paddle Trimming

The flow rate needed to actuate the F Series depends on many variables — turbulence, liquid viscosity and the exact area of the paddle face exposed to flow. Trim the paddle with a hacksaw or tin snips so it clears the pipe wall by at least 4 mm all round. As a guide: low flow — paddle just clears the bottom of the pipe; unknown flow — 3/4 of the way across the pipe; high flow — 1/4 to 1/2 of the way across the pipe. Spare paddles are available if too much is cut off. For an accurate estimate of switch performance and to determine the effect of paddle trimming, use the online Paddle Calculator — enter your pipe inside diameter, flow rate and liquid.

Open the Paddle Calculator →

Sensitivity Adjustment

F-H and F-L switches are supplied at maximum sensitivity (adjuster wound fully in). To decrease sensitivity, remove the red dust cap and wind the adjusting screw out (anticlockwise) with a wide flat screwdriver. The further out the screw, the more flow is needed to operate the switch. Refit the dust cap.

Mounting

The switch can go in suction or delivery pipework, horizontal or vertical. In vertical pipe the flow must be upward. Do not mount on the underside of horizontal pipe. Where possible, mount the switch away from pumps, valves and bends — a fitting directly upstream makes the flow uneven and turbulent at the paddle, which can shift the switching point slightly or make the paddle flutter near the switching point; downstream fittings have little effect. Mount in a pipe tee, tapping saddle or weld-on socket, square to the flow so liquid hits the flat face of the paddle, with the arrow on the switch pointing in the direction of flow. Seal the thread with PTFE tape or thread sealant, leaving at least 4 mm of thread above the socket, and tighten with a spanner on the spanner flats only — never twist the switch body.

Electrical Installation

The F Series is a mains voltage device — all electrical work must be carried out by a licensed electrician. Terminals are marked C (common), NO (normally open) and NC (normally closed); for a two-wire connection use C plus either NO or NC to suit the application. After wiring, 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.

Hazardous Areas

The F-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 F-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.

F-L — Inductive and Capacitive Loads NOT Suitable

The F-L is not suitable for inductive or capacitive loads such as contactors and relays. Loads above the rating will damage the switch.

Reed Switch — Inductive Loads NOT Suitable

The F-RL reed switch must NOT be used with inductive loads such as contactors or high-wattage relays. Use the F-H model or interpose a relay/contactor for such applications.

Materials & Chemical Compatibility

All-polypropylene models (no suffix) have polypropylene wetted parts. The -SS models have a high-pressure 316 stainless steel process connection and a polypropylene paddle. The paddle on every F Series model is glass-fibre-reinforced polypropylene. Check that the switch materials suit the liquid being monitored.

20 mm models stainless only

20 mm (3/4") fittings are only available with the 316 stainless steel process connection — not available in all-polypropylene.

Approved Standards

The 'H' and 'L' microswitches used in the F Series are approved to UL1054 (File E41515), CSA C22.2 No.55 (File LR21642) and EN61058-1, and are CE marked.

Manutenção

Totalmente sujeito a manutenção em campo. Um único parafuso acessível externamente libera a carcaça elétrica da parte úmida — remova-a para manutenção, ou desparafuse a chave da tubulação, sem mexer na fiação. Palhetas, vedações e chaves de reposição disponíveis na Kelco Engineering ou no seu distribuidor.

Mais opções em Chaves de fluxo de palheta

Série FM

Chave de fluxo de palheta para serviço pesado