Finetek FCX/FDX Magnetic FLoat Level Switch

FineTek FDX Series Magnetic Float Level Switch

Name: FineTek FDX Series Magnetic Float Level Switch
Brand: FineTek
SKU: FDX
Availability: InStock

SKU: FDX Categories: Float Level Switches, Level Switches

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Brand: FineTek

FineTek FDX Series Magnetic Float Level Switch

Need several level alarms but only one entry point into the vessel? The FineTek FDX Series top-mounted magnetic float level switch delivers exactly that, packing multiple switch points into a single mounting connection — a more cost-effective answer than installing separate sensors for each alarm level.

How It Works

The FDX runs on buoyancy and magnetism. Each float is sized by volume and weight to match a specific minimum fluid density and carries its own magnet. Reed switches built into the stationary stem correspond to each float’s position: as a float’s magnet reaches its reed switch, the contacts open or close, then reverse state again as the magnet moves away.

Key Features

Multiple switch points through a single mounting connection
Floats matched to fluid density from 0.45 S.G.
Sealed reed switch contacts — no external power needed
Stainless steel or engineering plastic construction
A cost-effective alternative to multi-sensor installations

Applications

High, low, and intermediate level switching in tanks and vessels
Wide range of liquids with minimum density of 0.45 S.G.
Multi-point level control from one entry point

Industries Served

Water and wastewater
Chemical
Marine use
General industry

Fine-Tek FDX Magnetic Float Level Switch

● GENERAL DESCRIPTION

Type

Magnetic float level switch (reed-switch actuated)

Working Principle

A permanent magnet is sealed inside a float ball that rides up/down a stem (tube). When the float’s internal magnet approaches the reed switch inside the stem, it actuates the reed switch contact, opening or closing a circuit (N.O. / N.C.) to indicate liquid level. No external power is required to actuate the switch.

Product Family Covered

FD-series magnetic float level switches, order-coded under the “FDX1-” numbering system: Standard flange/screw type (FD B), side/vertical-adjustment/top-mounting types (FD E, FD C, FD D), explosion-proof enclosure type (FD K, FD7 D/N), and marine-grade approved type (FH / FM). All variants share the same float/reed-switch working principle and differ by housing, mounting, connection, and certification options (see ORDERING INFORMATION).

Contact Life Expectancy

Up to 2,000,000 actuations per contact

Housing Protection Rating

IP65 minimum (standard); IP66 for explosion-proof enclosure variants

Multi-Point Measurement

Multiple float / multiple contact points available (custom-made); all output wiring terminates in a single junction box (housing) to simplify external wiring

Typical Applications

Shipbuilding, generator facilities, petrochemical, food/beverage, waste water / water purification, electronics, dyeing and finishing, chemical, rubber/plastic, hydraulic industries

● MATERIALS

Stem / Probe (Tube)

SUS (stainless steel), PVC, PVDF, or PP depending on probe diameter / order code (see ELECTRICAL/PERFORMANCE RATINGS table)

Probe Material Order Codes

MA: SUS304 | MB: SUS316 | MC: SUS316L (FCX order code table additionally lists PFA, PP, PVC, PVDF probe material options)

Float Ball Materials

SUS 316 / SUS 316L, SUS 304 (solid floats); PP (black/white), PVDF (hollow floats); NBR (black, foam floats) — see FLOAT SPECIFICATIONS table for material by model

Housing Materials

Aluminum, PP+Fiber, PC (polycarbonate), or SUS316 depending on housing type code (see DIMENSIONS / Housing Specification table)

Test Rod Accessory Materials

Rod connection: Bronze | Compressed spring: Stainless steel | Positioning clip: Stainless steel | Test rod stem: Stainless steel

Cable Conduit Accessory Materials

Washer: NBR | Body: Copper alloy (3/4″ NPT version) or Nickel-plated (1/2″ NPT version)

● ELECTRICAL / PERFORMANCE RATINGS

Standard Switch Specification (by tube/probe type)

Tube Type	Material	Switching Contact	Switching Capacity Max.	Switching Voltage Max.	Switching Current Max.	Carry Current Max.
OD8	SUS	SPST	50W	300Vac/350Vdc	0.5A	2.5A
OD8	PVC	SPDT	20W	150Vac/200Vdc	1A	2A
OD9.5	SUS	SPST	50W	300Vac/350Vdc	0.5A	2.5A
OD9.5	SUS	SPDT	20W	150Vac/200Vdc	1A	2A
OD12.7	SUS	SPST	50W	300Vac/350Vdc	0.5A	2.5A
OD12.7	SUS	SPDT	50W	400Vac/1000Vdc	1A	2A
OD16	PVDF	SPST	50W	300Vac/350Vdc	0.5A	2.5A
OD16	PVDF	SPDT	50W	400Vac/1000Vdc	1A	2A
OD17.2	PP	SPST	50W	300Vac/350Vdc	0.5A	2.5A
OD17.2	PP	SPDT	50W	400Vac/1000Vdc	1A	2A

Note: Reed switches with UL approval are rated 240Vac / 200Vdc, 50W, 0.5A.

Explosion-Proof Type Specification (by tube/probe type)

Tube Type	Material	Switching Contact	Switching Capacity Max.	Switching Voltage Max.	Switching Current Max.	Carry Current Max.
OD8	SUS	SPST	50W	250Vac	0.5A	1A
OD9.5	SUS	SPST	50W	250Vac	0.5A	1A
OD9.5	SUS	SPDT	10W	110Vac	0.5A	1A
OD12.7	SUS	SPST	50W	250Vac	0.5A	1A
OD12.7	SUS	SPDT	50W	250Vac	0.5A	1A
OD16	PVDF	SPST	50W	250Vac	0.5A	2.5A
OD16	PVDF	SPDT	50W	250Vac	0.5A	2.5A
OD17.2	PP	SPST	50W	250Vac	0.5A	2.5A
OD17.2	PP	SPDT	50W	250Vac	0.5A	2.5A

Application Fields of Float (Environmental Ratings)

Float Material	Working Temp.	Pressure Rating	Acid	Alkaline	Oil	Solvent
SUS304	-20°C ~ 120°C (200°C Max.)	10~35 kg/cm²	Not good	Acceptable	Excellent	Excellent
SUS316	-20°C ~ 120°C (200°C Max.)	10~35 kg/cm²	Acceptable	Good	Excellent	Excellent
Polypropylene (PP)	-20°C ~ 80°C	5 kg/cm²	Good	Good	Good	Not good
PVDF	-20°C ~ 120°C	5 kg/cm²	Excellent	Excellent	Good	Good

S10 float resistance: 50 kg. Detailed multi-chemical / multi-concentration resistance charts (PVC, PP, PVDF, PTFE, NBR, SUS304/316 vs. specific chemicals, concentrations and temperatures) are provided in the source datasheet as a graphical excellent/good/fair/corroded matrix; the symbol values were not reliably text-extractable and are omitted here — refer to the original PDF (pages 4–5) for chemical-specific compatibility.

Selection Guidance: PVDF max. 120°C; PP max. 80°C; SUS304/316 max. 200°C. Max. pressure of plastic floats is 5 kg/cm² (SUS floats 35 kg/cm²; S10 floats up to 50 kg/cm²). Use plastic float for acid/alkaline chemical corrosion; PVDF float is noted for high-temperature corrosive cases. Use stainless steel floats for gasoline, fuel oil, and petroleum applications. Float S.G. must be smaller than the liquid S.G., otherwise buoyancy cannot lift the float. For high-viscosity liquids, choose a smaller S.G. float with a greater diameter.

● DIMENSIONS

Housing Types

Housing Code	Material	Enclosure	Terminals	Max. Temp.	Overall Dim. (mm)	Notes
B	Aluminum	IP65	2~12	-20°C~200°C	128 dia. / φ118, H107, 1/2″PF	—
C	PP+Fiber	IP65	2~12	-20°C~80°C	128 dia. / φ118, H107, 1/2″PF	—
D	Aluminum	IP65	2~12	-20°C~200°C	φ113, H108, 1/2″NPT	Whole unit (with housing) carries NEPSI/ATEX approvals
E	Aluminum	IP65	2~6	-20°C~200°C	88 x 84, 1/2″PF	—
G	PC	IP65	2~6	-20°C~80°C	85×80, H55, PG16	—
H	Aluminum	IP65	2~12	-20°C~100°C	φ70, H70, 1/2″PF	—
K (Ex)	Aluminum	INERIS 09 ATEX 0049, II 2GD Ex d IIC T4~T6	2~6	-20°C~100°C	φ90, H100, 3/4″NPT	Explosion-proof enclosure
L (Ex)	Aluminum	INERIS 09 ATEX 0049, II 2GD Ex d IIC T4~T6	2~6	-20°C~90°C	Ring housing	Explosion-proof; for flow switch series
M	SUS316	IP65	2~6	-20°C~200°C	φ70, H80, 1/2″NPT	For side-mounting float series
N	SUS316	IP65	2~6	-20°C~200°C	φ70, H80, 1/2″NPT	Whole unit (with housing) carries NEPSI/ATEX approvals
X	Aluminum	IP65	2~6	-20°C~100°C	φ70, H70, 1/2″PF	—

Float Specifications

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Float Style	Type	Dim. ØA x B x ØC (mm)	S.G.	Max. Pressure (kg/cm²)	Weight (g)	Material/Color	Max. Temp. (°C)
Solid (rectangular)	S1	28x28x9.5	E>0.7	10	8	SUS316 / 316L	200
	S3	45x55x15	E>0.65	12	37.6	SUS316	200
	S6	75x108x20	E>0.5	10	165	SUS316	200
	R3	38x50x15	E>0.62	12	22.9	SUS316L	200
Solid (round)	S2	41x38x11	E>0.7	35	19.5	SUS316	200
	S4	52x52x15	E>0.55	30	33.4	SUS316	200
	S5	75x73x20	E>0.70 (E>0.61 for FG)	30	102.4	SUS316	200
	S7	30x28x9.5	E>0.75	25	8	SUS316 / 316L	200
	S8	100x100x20	E>0.5	15	249.7	SUS304	200
	S9	150x150x30

Download FineTek FDX Series Magnetic Float Level Switch information here

Datasheet:
Manual:

FineTek FDX Series Magnetic Float Level Switch

FineTek FDX Series Magnetic Float Level Switch

How It Works

Key Features

Applications

Industries Served

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