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

Models & Ordering

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Model Description Usually Ships Price Order
L4
Ships: Same Day
Price: $375.00
Float switch, brass body, 316SS float, side wall mounting. Same Day $375.00 Order
L4-SS
Ships: Same Day
Price: $522.00
Float switch, 316SS body, 316SS float, side wall mounting. Same Day $522.00 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 0344 EX II 2 G Ex d IIB T6 Gb -20°C≤Tamb󖽙°C. -20°C≤Process Temp󖽙°C. EC-Type Certificate No.: KEMA 03 ATEX 2383. ATEX Standards: EN60079-0: 2009; EN60079-1: 2007. IECEx Certified: For Ex d IIB T6 Gb -20°C≤Tamb󖽙°C. -20°C≤Process Temp󖽙°C. IECEx Certificate of Conformity: IECEx DEK 11.0071. IECEx Standards: IEC 60079-0: 2007; IEC 60079-1: 2007.
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

  • Leak proof body machined from bar stock
  • Choice of floats dependant on maximum pressure and specific gravity
  • Weatherproof, designed to meet NEMA 4
  • Explosion-proof
  • Installs directly and easily into tank with a threaded branch connection or flange
  • Electrical assembly can be easily replaced without removing the unit from the installation so that the process does not have to be shut down
  • Horizontal installation or optional top mount vertical installation
  • Unique magnetically actuated switching design gives superior performance
  • No bellows, springs, or seals to fail
  • 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

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

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

Product Literature

Manuals

Catalog Pages

Product Data Sheet

Approvals

Drawings

Questions

Question
What else needs to be specified when ordering an L4-TOP?
Answer
The vertical and horizontal lengths of the float arm.
Question
Why is the minimum specific gravity important on the float level switches?
Answer
If a medium has a lower s.g. than the rated minimum for a float, the float will sink through the media and the switch will not operate.

Photo Downloads

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