Série FMDétecteur de débit à palette usage intensif

Conçu pour les applications industrielles et minières les plus exigeantes. Détecteur à palette robuste mais très sensible, avec boîtier en aluminium massif et raccord process monobloc en acier inoxydable 316. Pression nominale 400 bar, dérogation manuelle intégrée sur tous les modèles.

Caractéristiques

Interrupteur S.P.D.T. 5–500 V CA, 15 A (modèle H)
Modèle « L » basse tension à contacts or disponible (FM-L)
Raccord process monobloc en acier inoxydable 316
Boîtier en aluminium massif ultra-robuste
Dérogation manuelle intégrée
Modèles 3/4" et 1" disponibles avec filetage BSP ou NPT
Pression nominale 400 bar (5800 psi)
Entraînement magnétique sans joint
Versions diesel et haute température disponibles
Boîtier IP67 étanche aux intempéries
Facile à entretenir

La série FM utilise le même entraînement à couplage magnétique que la série F — le mouvement de la palette est couplé à l’interrupteur très souple à travers une paroi pleine en acier inoxydable et aluminium, ce qui donne un détecteur haute pression sans joints, membranes, soufflets ni autres points de défaillance potentiels. Fourni en standard avec un raccord process monobloc en acier inoxydable 316 et un boîtier entièrement usiné en aluminium massif. Disponible avec une palette en polypropylène renforcé de fibre de verre, ou une palette en alliage cuivre-nickel pour les applications diesel et haute température. La palette peut être coupée et mise en forme pour les tuyauteries de 25 mm (1") ou plus, et la dérogation manuelle intégrée enclenche le détecteur de débit d’une simple pression sur un bouton, quel que soit le débit. Convient à l’eau de forage, à l’eau de mer et à de nombreuses solutions chimiques.

Plus d’informations

Commande — Modèles disponibles

Référence	Description
FM-H-25B	Standard heavy-duty switch (H) — 1" BSP thread, polypropylene paddle for water use
FM-H-25B-D	Standard heavy-duty switch (H) — 1" BSP thread, nickel copper alloy paddle for Dieseline and high-temperature applications
FM-H-25N	Standard heavy-duty switch (H) — 1" NPT thread, polypropylene paddle for water use
FM-H-25N-D	Standard heavy-duty switch (H) — 1" NPT thread, nickel copper alloy paddle for Dieseline and high-temperature applications
FM-H-20B	Standard heavy-duty switch (H) — 3/4" BSP thread, polypropylene paddle for water use
FM-H-20B-D	Standard heavy-duty switch (H) — 3/4" BSP thread, nickel copper alloy paddle for Dieseline and high-temperature applications
FM-H-20N	Standard heavy-duty switch (H) — 3/4" NPT thread, polypropylene paddle for water use
FM-H-20N-D	Standard heavy-duty switch (H) — 3/4" NPT thread, nickel copper alloy paddle for Dieseline and high-temperature applications
FM-L-25B	Low-voltage gold-contact model (L) — 1" BSP thread, polypropylene paddle for water use
FM-L-25B-D	Low-voltage gold-contact model (L) — 1" BSP thread, nickel copper alloy paddle for Dieseline and high-temperature applications
FM-L-25N	Low-voltage gold-contact model (L) — 1" NPT thread, polypropylene paddle for water use
FM-L-25N-D	Low-voltage gold-contact model (L) — 1" NPT thread, nickel copper alloy paddle for Dieseline and high-temperature applications
FM-L-20B	Low-voltage gold-contact model (L) — 3/4" BSP thread, polypropylene paddle for water use
FM-L-20B-D	Low-voltage gold-contact model (L) — 3/4" BSP thread, nickel copper alloy paddle for Dieseline and high-temperature applications
FM-L-20N	Low-voltage gold-contact model (L) — 3/4" NPT thread, polypropylene paddle for water use
FM-L-20N-D	Low-voltage gold-contact model (L) — 3/4" NPT thread, nickel copper alloy paddle for Dieseline and high-temperature applications

Limites de fonctionnement

Maximum operating pressure (FM with polypropylene paddle, ambient)	400 bar / 5800 psi
Maximum operating pressure (FM-D with metal paddle, ambient)	400 bar / 5800 psi
Minimum burst pressure (both models)	800 bar / 11 600 psi
Maximum operating temperature (polypropylene paddle)	80 °C / 176 °F
Maximum operating temperature (metal paddle, FM-D)	100 °C / 212 °F
Minimum operating temperature (both models)	-60 °C / -76 °F
Ingress protection rating	IP67

Données électriques

Switch type	S.P.D.T. (single pole, double throw) standard heavy-duty microswitch for general control circuits up to 500 V AC — ideal for pump starters, relay logic, contactors and timers
Voltage range	5 to 500 V AC (minimum load 160 mA at 5 V DC)
Maximum switched current	15 A (10 A at 500 V AC). Maximum voltage and maximum current cannot be applied together.
Resistive or inductive load (125 V AC or 250 V AC)	15 A
Resistive / inductive load at other voltages	500 V AC: 10 A / 6 A; 8 V DC: 15 A / 15 A; 14 V DC: 15 A / 10 A; 30 V DC: 6 A / 5 A; 125 V DC: 0.5 A / 0.05 A; 250 V DC: 0.25 A / 0.03 A
Lamp load (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
Motor load (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
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.
FM-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.
FM-L rated current (resistive)	0.1 A at 125 VAC; 0.1 A at 8, 14 and 30 VDC
FM-L inrush current	0.1 A maximum (NC and NO)
FM-L minimum applicable load	1 mA at 5 VDC
FM-L operating range (micro load)	5 to 30 V, 5 to 800 mW (26 mA maximum at 30 V)
FM-L contact resistance	50 mΩ maximum (initial)
FM-L typical applications	PLC, telemetry and low voltage control

Dimensions

Manual Override

All FM models include a red manual override button on the side of the housing, under the cable gland. Pressing it 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

Cut the paddle to suit the application — it must clear the pipe wall by at least 4 mm all round. Use a hacksaw or tin snips (heavy-duty tin snips for the FM-D metal paddle). 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. The flow rates required to actuate depend on turbulence, viscosity, and the exposed paddle area. Use the online Paddle Calculator to estimate activation flow and determine the right cut.

Open the Paddle Calculator →

Sensitivity Adjustment

FM 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.

Dieseline / High-Temperature Variant

Order the -D suffix (e.g. FM-H-25B-D) for dieseline service or operation up to 100 °C. The polypropylene paddle is replaced with a Nickel Copper alloy paddle. Kelco products are not intended for use in hydrocarbons other than dieseline.

Mounting

The switch can go in suction or delivery pipework, horizontal or vertical. In vertical pipework the flow must be upward, not downward. Never install the switch on the underside of horizontal pipework. 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 FM 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. Connect the earth terminal inside the housing: the FM must be earthed when operated at mains voltage. 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 FM-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 FM-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.

FM-L — Inductive and Capacitive Loads NOT Suitable

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

Replacing the Paddle

The paddle and its associated pivot bearings are replaceable items. Spare paddles can be obtained from your supplier — please quote the part number of the flow switch when ordering. Replacement paddles are supplied with new bearing shells and a large retaining O-ring. On FM-D models the nickel copper alloy paddle, main arm and bronze pivot bearing are also replaceable; never undo or remove the sealed hexagonal cap at the top of the main arm, which houses the magnet.

Materials & Chemical Compatibility

All FM models have a one-piece 316 stainless steel process connection and a billet aluminium housing. The standard FM has a glass-fibre-reinforced polypropylene paddle for water use; the FM-D has a nickel copper alloy paddle. Suitable for use in bore water, sea water and many chemical solutions. Check that the switch materials suit the liquid being monitored.

Approved Standards

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

Maintenance

Entièrement entretenable sur site. La palette et ses paliers de pivot sont des pièces remplaçables (sur le FM-D : la palette en alliage cuivre-nickel, le bras principal et le palier de pivot en bronze). Le boîtier électrique est un ensemble distinct verrouillé sur la partie humide par une seule vis accessible de l’extérieur — remplacement des modules sans démontage de la tuyauterie. Palettes, joints et interrupteurs de rechange disponibles auprès de Kelco Engineering ou de votre distributeur.

Autres modèles dans Détecteurs de débit à palette

Série F

Détecteur de débit à palette résistant à la corrosion