Single & Multi Float Level Switches


From simple, high-volume reed switches to specialist technologies designed for more challenging environments, Gems Sensors & Controls offer an extensive choice of float-type level switches.

The company has a strong reputation for collaborating with in-house engineering teams, bringing a detailed understanding of the design and operational factors involved with each application.

Often, the choice of sensor is dictated by the media to be measured, such as its specific gravity, viscosity or corrosiveness. Sometimes, design constraints relate to the best way to integrate the sensor, including its position, mounting and size within a restricted space.

Gems offer hundreds of single- and multi-point models, including specialist options for food use, ultra-pure liquids or hazardous chemicals. Components can also be custom designed or modified using 3-D modelling or integrated into subassemblies.

To discuss a project requiring liquid level measurement, or to request a test sample of a float switch for your product design, call +44 (0) 1483 869 700 or email sales@hawco.co.uk.

Single Point: Side Mounted (Horizontal) Float Switches

Side-mounted reed-style float switches which rise or lower with liquid level for either normally open or normally closed operation. ‘Drop down’ design for calcifying hot water applications (NSF approval)

Part Material Mounting Compatible Media
LS7-165570 Nylon Internal (Type 3) Oil, Fuel, Hydrocarbons Datasheet
LS7-164520 Polypropylene Internal (Type 3) Chemicals, Water Datasheet
LS7-131100 Polypropylene External (Type 5) Chemicals, Water Datasheet
LS7-140620 Nylon External (Type5) Oil, Fuel, Hydrocarbons Datasheet
LS7-177100 Versaplast External (Type 5) Oil, Antifreeze, High Temp Corrosive Fluids, Chemicals Datasheet
LS7-160450 Polypropylene External (Type 7) Chemicals, Water Datasheet
LS7-160460 Nylon External (Type 7) Oil, Fuel, Hydrocarbons Datasheet
LS7-165800 Polypropylene External (Type 10) Chemicals, Water Datasheet
LS7-191080 Noryl Internal (Type 10) Portable Water, Limited Chemicals Datasheet
'Drop Down' Type 12
LS7-191080 Noryl Internal (Type 12) Portable Water, Limited Chemicals Datasheet

For oils and fuels, select Nylon.
For potable water and broad chemicals, select NSF Standard 169 polypropylene.
For corrosive fluids, hot water, antifreeze, chemicals and oils, select Versaplast™.
Also available for rugged environments with stainless steel or zinc bodies

Single Point: Top or Bottom Mounted (Vertical) Float Switches

Top or bottom mounted reed-style float switches which rise or lower with liquid level for either normally open or normally closed operation. ‘Drop down’ design for calcifying hot water applications (NSF approval)

Part Material Mounting Type Compatible Media
LS3-42295 Polysulfone 1/8" NPT Water Based Datasheet
LS3-142505 Polypropylene (Hollow) 1/8" NPT Chemicals Datasheet
LS3-171517 Polypropylene (Hollow) 3/8"-16 Chemicals Datasheet
LS3-116826 Polypropylene (Solid) 1/8" NPT Chemicals Datasheet
LS3-171514 Polypropylene (Solid) 3/8"-16 Chemicals Datasheet
LS3-162745 Nylon/Buna 1/8" NPT Oils, Fuels Datasheet
LS3-173250 PVDF 1/8" NPT Ultra-Pure Datasheet

Also available for NSF approved water use using Polypropylene NSF Std. 169 material
Large and alloy versions also available plus miniature and micro floats

Single Point: Electro-Optic Solid State Fluid Sensors

Electro-optic sensors are designed to detect rising liquid by using light from an infrared LED and a light receiver. When the LED is covered, light no longer reaches the receiver. These sensors are used in a wide variety of applications including medical laboratory equipment, food and beverage systems, hydraulic reservoirs, petrochemicals and pharmaceutical production. Low-cost, compact and easy to install, optical level sensors have no moving parts making them highly reliable.

Part Input Power Probe Condition
at Current Sink
Mounting Type
ELS-1100-142700 10-28 VDC Wet 1/4" NPT Datasheet
ELS-1100-143585 10-28 VDC Wet 1/4" NPT & 3/8" Conduit Datasheet
ELS-1100-169555 10-28 VDC Wet M12X1-8G Datasheet
ELS-1100-143570 10-28 VDC Dry 1/4" NPT Datasheet
ELS-1100-143590 10-28 VDC Dry 1/4" NPT & 3/8" Conduit Datasheet
ELS-1100-148973 10-28 VDC Dry 'Fish' Pull Ring Datasheet

Electro-optic sensors are not recommended for use in any liquid that crystallizes or leaves a solid residue. Available in engineered plastic, stainless steel, alloy or Opto-Pak materials.