Series L4 FLOTECT® Float Switch

Magnetically Operated Switch, Leak Proof Body, Explosion-Proof

Rugged and reliable the Series L4 Flotect® Float Switch operates automatically to indicate tank level. Perfect for starting or stopping pumps, opening or closing valves, or actuating level alarm signals. A unique magnetically actuated switching design gives superior performance. There are no bellows, springs, or seals to fail. Instead, the free-swinging float attracts a magnet within the solid metal switch body, actuating a snap switch by means of a simple lever arm. Float arm hinge design limits the arm angle to prevent vertical hang up.

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Product Applications

Direct pump control for maintaining level
Automatic tank dump operations
Control levels or provide alarms in sumps, scrubber systems, hydro-pneumatic tanks, low pressure boilers, and various water/wastewater treatment processes
Level control
Valve control

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Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

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Model	Description	Usually Ships*	Price	Order
L4 Ships: Next Day Price: $716.00	Float switch, brass body, 316SS float, side wall mounting.	Next Day*	$716.00	Order
L4-SS Ships: Next Day Price: $986.00	Float switch, 316SS body, 316SS float, side wall mounting.	Next Day*	$986.00	Order
L4SSTOP Ships: 1-2 Weeks Price: $1,001.50	Float switch, SS, SPDT, (V=4, H=3)	1-2 Weeks*	$1,001.50	Order
L4TOP Ships: 1-2 Weeks Price: $731.50	Float switch, brass, SPDT, (V=4, H=3)	1-2 Weeks*	$731.50	Order

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Specifications

Service:: Liquids compatible with wetted materials.
Wetted Materials:: Float and Rod: 316 SS; Body: Brass or 316 SS standard; Magnet Keeper: 430 SS standard, 316 SS or nickel optional.
Temperature Limits:: 4 to 275°F (-20 to 135°C) standard, MT high temperature option 400°F (205°C) [MT option not UL, CSA, ATEX or IECEx]. ATEX and IECEx options: Ambient temperature -4 to 163°F (-20 to 73°C); Process temperature -4 to 163°F (-20 to 73°C).
Pressure Limit:: Brass body 1000 psig (69 bar), 316 SS body 2000 psig (138 bar). Standard float rated 100 psig (6.9 bar). For other floats, see options.
Enclosure Rating:: Weatherproof and Explosion-proof. **Listed with UL and CSA for Class I, Groups C and D; Class II, Groups E, F, and G. ATEX CE 2813 II 2 G Ex db IIB T6 Gb -20°C≤Tamb≤73°C. -20°C≤Process Temp≤73°C. EU-Type Certificate No.: KEMA 03 ATEX 2383. ATEX Standards: EN 60079-0:2012+A11:2013. IECEx Certified: For Ex db IIB T6 Gb -20°C≤Tamb≤73°C. -20°C≤Process Temp≤73°C. IECEx Certificate of Conformity: IECEx DEK 11.0071. IECEx Standards: IEC 60079-0:2011; IEC 60079-1:2014.
Switch Type:: SPDT snap switch standard, DPDT snap switch optional.
Electrical Rating:: UL, FM, ATEX and IECEx models: 10 A @ 125/250 VAC (V~). CSA models: 5 A @ 125/250 VAC (V~); 5 A res., 3 A ind. @ 30 VDC. MV option: 1 A @ 125 VAC (V~); 1 A res., .5 A ind. @ 30 VDC. MT option: 5 A @ 125/250 VAC (V~). [MT and MV option not UL, CSA, FM, ATEX or IECEx]
Electrical Connection:: UL and CSA models: 16 AWG, 6" (152 mm) long. ATEX and IECEx units: terminal block.
Conduit Connection:: 3/4" (19.05 mm) female NPT standard or M25 with -BSPT option.
Process Connection:: 1-1/2" (38.10 mm) male NPT or 1-1/2" (38.10 mm) male BSPT standard, 2-1/2" (63.50 mm) male NPT or 2-1/2" (63.50 mm) male BSPT standard optional floats.
Mounting Orientation:: Horizontal installation standard, optional vertical top mount.
Deadband:: 3/4" (19 mm) for standard float.
Specific Gravity:: 0.7 minimum with standard float. For other floats see Options/Accessories page.
Weight:: 4 lb 9 oz (2.07 kg).
Agency Approvals:: ATEX, CE, CSA, FM, IECEx, UL**.
: **No Housing Option (-NH) has no approvals.

Features

Superior performance due to unique magnetically-actuated switching design
Long product life with no bellows, springs, or seals to fail
Avoids clogs using a free-swinging float that attracts a magnet within the solid metal switch body, actuating a snap switch by means of a simple lever arm
Prevents vertical hang up with float arm hinge design that limits the arm angle

Options

-D DPDT Contacts.
-MV Gold Plated Contact option for dry circuits.
-MT High Temperature option rated 400°F (204°C).
-TRI Time Delay Relay option for increasing flow with 2 SPDT contacts, adjustable from 0-1 to 0-31 minutes. (No listings or approvals.)
-TRD Time Delay Relay option for decreasing flow with 2 SPDT contacts, adjustable from 0-1 to 0-31 minutes. (No listings or approvals.)
-316 316SS Magnet Keeper option to replace standard 430SS.
-AT ATEX approved construction.
-SAA SAA approved construction.
-TOP Top Mounted option for vertical flange installation (distance from flange face to centerline of float to be specified, 20" [508 mm] maximum).
OPTIONAL FLOATS (all 2-1/2" spherical):
-50 304SS Float rated 50 psig (3.5 bar) and 0.5 min. s.g. (2-1/2" spherical).
-150 316SS Float rated 150 psig (10.3 bar) and 0.7 min. s.g. (2-1/2" spherical).
-300 304SS Float rated 300 psig (20.7 bar) and 0.7 min. s.g. (2-1/2" spherical).

Videos

No Contact! When to Use Gold Contact Switches

Liquid in your Housing? How to Prevent Conduit Condensation

Model Chart

EXAMPLE	L4	SS-D-TOP	50	B1HC	Series L4-SS-D-TOP-50-B1HC Flotect® Float Switch, 316 SS body, DPDT, top mounted housing, 50 psi - 2-1/2" spherical float, with 2" hex type carbon steel bushing.
SERIES	L4				Flotect® Float Switch
1ST SET OF OPTIONS (Select any or all)		SS D TOP			316SS Body (430 Magnet Keeper) DPDT Top Mounted Housing
2ND SET OF OPTIONS			50 150 300 316 AT BSPT CI EPOXY IEC MT MV NH NI ST TBC TRD TRI W		50 psi, 2-1/2" Spherical Float 150 psi, 2-1/2" Spherical Float 300 psi, 2-1/2" Spherical Float All 316SS Wetted Parts ATEX Approval BSPT Process Connection, M25 Conduit Cast Iron Housing Epoxy Coated Housing IECEX Approval High Temperature Gold Contacts No Housing Nickel 200 Vane/Vane Block Stainless Steel Tag Terminal Block Connection Time Delay Relay, Decreasing Flow Time Delay Relay, Increasing Flow Weld SST Threaded Flange or Bushing to SST Body
FLANGES/BUSHINGS				B1FC B1HB B1HC B1H4 B1HS B2FC B2F4 B2HC B2H4 B2HS B2HB B4HS F2C1 F2C3 F2C6 F2C9 F3C1 F3C3 F2S1 F2S3 F2S6 F3S1 F3S3 F4C1 F4C3 F4S1 F4S3	2" Flush Type Carbon Steel Bushing 2" Hex Type Brass Bushing 2" Hex Type Carbon Steel Bushing 2" Hex Type 304SS Bushing 2" Hex Type 316SS Bushing 2-1/2" Flush Type Carbon Steel Bushing 2-1/2" Flush Type 304SS Bushing 2-1/2" Hex Type Carbon Steel Bushing 2-1/2" Hex Type 304SS Bushing 2-1/2" Hex Type 316SS Bushing 2-1/2" Hex Type Brass Bushing 4" Hex Type 316SS Bushing 2" Carbon Steel 150# Flange 2" Carbon Steel 300# Flange 2" Carbon Steel 600# Flange 2" Carbon Steel 900# Flange 3" Carbon Steel 150# Flange 3" Carbon Steel 300# Flange 2" 316SS 150# Flange 2" 316SS 300# Flange 2" 316SS 600# Flange 3" 316SS 150# Flange 3" 316SS 300# Flange 4" Carbon Steel 150# Flange 4" Carbon Steel 300# Flange 4" 316SS 150# Flange 4" 316SS 300# Flange