Série P25Chave de fluxo em linha resistente à corrosão (1")
Chave de fluxo robusta para qualquer posição, para líquidos em tubulações de 15 mm a 25 mm (1/2" a 1") de diâmetro — até 100 L/min. Detecta fluxos contínuos ou pulsados; sem peças metálicas em contato com o líquido. O modelo P25-S inclui uma chave mecânica para serviço pesado + override manual para controle direto de motores de bomba (carga de motor 8,3 A a 250 V CA, UL 2 HP).
Recursos
- Controla diretamente motores de bomba (modelo P25-S): carga de motor 8,3 A a 250 V CA, UL 2 HP
- Ideal para CLP e lógica de relés
- Override manual disponível (modelo P25-S)
- Adequado para tubulações de 15 mm a 25 mm (1/2" a 1") de diâmetro
- Sem peças metálicas em contato com líquidos
- Vazão máxima de 100 L/min
- Montagem versátil em qualquer posição
- Pressão nominal 18 bar (260 psi)
- Carcaça à prova de intempéries IP67
- Detecta vazões muito baixas
O P25 é fornecido com uniões e bolsas padrão de tubo de PVC para colagem direta com solvente em tubulação de PVC. Sem peças metálicas em contato com o fluido, é adequado para meios agressivos, incluindo água subterrânea, água do mar, ácidos e álcalis. É fabricado em polipropileno reforçado com fibra de vidro, com O-rings de nitrila, e é adequado para todas as aplicações expostas ao ar livre. Três configurações elétricas: P25-B (reed switch, uso com CLP), P25-C (reed S.P.D.T. com abertura antes do fechamento, mais sensível) e P25-S (S.P.D.T. mecânico para serviço pesado com override manual, controle direto de motor).
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Warning: Electrical Safety
The P25 Series flow switch is a mains voltage device. Death or serious injury may result if this switch is not correctly installed and operated. All electrical work on this switch must be performed by a fully qualified and licensed electrician.
Manual Override (P25-S only)
The P25-S has a manual override located on the side of the switch body under a locking cap (remove the cap by placing a small screwdriver in the notch on its underside; it pops off when lifted gently). The override dial turns through 90 degrees between ‘Auto’ and ‘ON’. Normally left in the ‘Auto’ position; in the ‘ON’ position the state of flow is ignored and the switch is on — useful for priming pumps in spite of an initial lack of flow, or for testing control wiring and simulating switch operation during installation and commissioning. The P25-B and P25-C models do not have manual override.
Direct Motor Control (P25-S only)
The P25-S’s heavy-duty mechanical switch is designed for the direct control of single-phase pump motors (motor load 8.3 A at 250 V AC, UL 2 HP) and suits general control circuits up to 500 V AC (20 A at 250 V AC). For larger motors or 3-phase, drive an interposing contactor and verify cable / voltage drop with the Pump Controller Power Calculator.
Pipe Connection
Inlet and outlet unions are available in various sizes and with PVC sockets to suit 15, 20 or 25 mm PVC pressure pipe (model suffix 15, 20 or 25 = 15NB, 20NB, 25NB). The outlet union can also be unscrewed and the 25 mm (1") B.S.P. thread in the switch body used directly as the pipe termination.
Mounting & Installation
The P25 can be mounted in any orientation, including upside down. There is a direction of flow arrow on the switch body; the switch will not operate against a reverse flow. Pipework can be used to support the switch, or the switch can be connected directly to valve manifolds or pump ports. Do not use this flow switch as a non-return valve. Protect the switch from freezing and from exposure to hot liquids > 60 °C, do not use it where the static or dynamic pressure exceeds 18 bar, and take care that it is not exposed to water hammer.
Clean Fluid & Line Strainer
The P25 contains a close fitting piston and should only be used where the process fluid is clean and free from entrained or suspended materials. Solutions that contain large particulates, ferrous materials or fibrous matter should not be used in this switch. If the degree of contamination of the process liquid can’t be guaranteed, install a suitable line strainer before the flow switch.
Hazardous Areas
The P25-B and P25-C are 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. They are not Ex certified in their own right. The full conditions of use are given in the installation sheet. The P25-S 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).
Reed Switch Protection (P25-B and P25-C)
The P25-B and P25-C use a dry contact reed switch as the primary switching element. Reed switches offer an operating life in excess of 100 million cycles; however, care needs to be taken to ensure they are not electrically overloaded. If applied in questionable applications, suitable protection should be added to the control circuit. Details of reed switch protection circuits are on our Reed Switch Information page.
Electrical Installation
The P25-S contains a magnetically coupled, high current, high voltage single pole double throw microswitch suited to most general-purpose control circuit applications at any voltage up to 500 VAC; its terminals are Common (1), Normally closed (2) and Normally open (3). The P25-B and P25-C contain a gas-filled reed switch giving an S.P.S.T. or S.P.D.T. break before make action for low power applications. The model number is on a label inside the switch lid. The cable gland is threaded M20 and accepts standard M20 conduit bushes as well as flexible cable. Ensure the lid and cable gland are securely tightened, and in fully exposed locations use secondary precautions such as cable drip loops so that no water can enter the switch housing.
Typical Applications
Safety shower alarms, loss of prime protection for pumps, flow monitor for large dosing systems, constant pressure pump control, control of tank filling systems and low yield bore pump protection.
Manutenção
Totalmente sujeito a manutenção em campo. As uniões de entrada e saída são intercambiáveis e disponíveis em vários diâmetros de tubulação. Vedações e módulos de chave de reposição disponíveis na Kelco Engineering ou no seu distribuidor.
