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Process Control & Measurement > Level Sensors & Controllers > Float Level Switches

Float Level Switches

Float level switches provide a low-cost solution for single-point monitoring of liquid level in industrial applications. Designed for shock and vibration resistance, powerful magnets in the float actuate a reed switch as the liquid level varies. A variety of constructions offer compatibility with many liquids, temperature ranges and system pressures.

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Float Level Switches

Vertical Top-Mount
Vertical Suspendible / Submersible
Horizontal Side-Mount
Float Level Switch Kits
Float Level Tilt Switches

ProSense float level switches provide a low-cost general purpose solution for single point monitoring of liquid level in a variety of applications. Designed for shock and vibration resistance, ProSense float level switches ensure long and trouble-free service.

Powerful permanent magnets within the float actuate a highly reliable and repeatable hermetically sealed reed switch as the float rises and lowers with liquid level.
These switches are available in several different material constructions for compatibility with many types of liquids, a wide temperature range, and various system pressure requirements.
Vertical and horizontal mounting styles with several mounting thread variations are available for ease of installation.
Reed switches carry electrical ratings for both AC and DC voltage for adaptability to many control interface applications.
ProSense float level switches are shipped configured for normally closed switch operation. Except where noted, most models can be easily converted to normally open operation in the field.

Float level switches start at
$12.00
(FLS-VM-100)

Float Level Switches Overview

Float Level Switches,
Vertical Top-Mount

For Vertical Mount switches, normally closed is defined as the switch mounted in a vertical position with the mounting threads above the float (top mount) and the float in the "dry" position at the bottom of the stem. When the liquid raises the float, the switch will open. Can be converted in the field to function as normally open.

Float materials: Polypropylene (PP), Buna-N, 316SS, Kynar (PVDF), PTFE "Teflon"
Stem materials: Polypropylene (PP), Polybutylene Terephthalate (PBT), Brass, 316SS, Kynar (PVDF), PTFE "Teflon"
Mounting: 3/8-16 UNC, 1/8" MNPT, 1/4" MNPT (install +/- 30� from vertical)
- can also be mounted with the mounting threads below the float (bottom mount) as in the bottom of a tank
Temperature range: -40�F up to 392�F (depending on model)
Max pressure ratings: up to 500 psig (FLS-VL-600)
Made in the USA

Vertical top mount float level switches start at
$12.00
(FLS-VM-100)

Top Mount Float Level Switches Overview

Float Level Switches, Vertical Suspendible / Submersible

Normally closed switch; can be converted in the field to function as normally open.

Float material: Buna-N
Stem material: Brass
Slosh shield: Polybutylene Terephthalate (PBT)
Mounting: Suspendible cable
Temperature range: -40�F to 221�F
Max pressure: 50 psig
Made in the USA

The FLS-VL-900 suspendible / submersible float level switch is
$112.00
(FLS-VL-900)

Suspendible / Submersible Float Level Switch Overview

Float Level Switches,
Horizontal Side-Mount

For Horizontal Mount switches installed in the side of a tank (side-mounted), normally closed is defined as when the float arm is below and parallel with the stem in the "dry" position. When the liquid raises the float, the switch will open. Switch operation is changed by rotating the switch position so that the float arm is above the stem. The switch is then normally open in the "dry" position and will close when the liquid raises the float.

Float materials: Polypropylene (PP), Polybutylene Terephthalate (PBT), 316SS, Kynar (PVDF), Buna-N
Stem materials: Polypropylene (PP), Polybutylene Terephthalate (PBT), 316SS, Kynar (PVDF), Brass
Mounting: 3/8-24 UNC, 5/8-11 UNC, 1/2-13 UNC, 1/2" MNPT, dual 1/2" MNPT, 1" MNPT x 1/2" MNPT
Temperature ranges: -40�F up to 392�F (depending on model)
Max pressures: up to 300 psig
Made in the USA

Side mount, horizontal float level switches start at
$14.00
(FLS-HS-100)

Horizontal Float Level Switches Overview

Float Level Switch Kits

ProSense float level switch kits provide the opportunity to fabricate in the field a customized two-float level switch with a maximum stem length of 36 inches (914.4 mm) using the supplied kit components. Level switch kits are available in three different material constructions (polypropylene, brass, stainless steel) for compatibility with different liquids. Each kit contains:

2-inch NPT male threaded pipe plug with attached cuttable mounting tube
Two additional cuttable connecting tubes
Two floats
Two SPST switch capsules that can function as either normally closed or normally open depending on float orientation
Four compression unions
One compression end cap
Made in the USA

Float level switch kits start at
$201.00
(FLS-VK-200)

Float Level Switch Kits Overview

Float Level Tilt Switches

Float level tilt switches provide inexpensive, efficient and highly reliable level detection in open vessels, sumps and ponds.

The molded rubber float has an integral three-conductor cable and operates on a mercury-free micro-switch device that is located inside the float on an anti-vibration mount.
The rubber float is constructed of ethylene propylene diene (EPDM), a synthetic rubber with rigid and durable characteristics for long service life and resistance to heat, oxidation, ozone and aging due to weather. EPDM has good electrical resistivity, as well as resistance to solvents such as water, acids, alkalis, phosphate esters and many ketones and alcohols.

Float level tilt switches are
$36.50
(FLS-HT-100)

Float Level Tilt Switches Overview

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