Float Assembly for Level Gauging | Component Directory

Product Specifications

Technical details and manufacturing context for Float Assembly

Definition

The Float Assembly is a component used in level gauging systems within the machinery and equipment manufacturing industry. It consists of a buoyant float, typically hollow and sealed, connected to a mechanical linkage or transmitter. The assembly detects liquid level changes by floating on the surface of the measured liquid, converting vertical displacement into a mechanical or electrical signal for level indication, control, or monitoring. The float is made from materials such as stainless steel, polypropylene, PTFE (Teflon), or Hastelloy, selected based on the chemical compatibility and temperature requirements of the application. Key parameters include nominal diameter (15–100 mm per ISO 6708), float diameter (50–200 mm), float material (304/316L per ASTM A240), operating temperature (-40–150°C), operating pressure (1.0–1.6 MPa), sealing class (A–C), stroke length (10–300 mm), repeatability (±0.5 mm), ingress protection (IP54–IP65 per IEC 60529), and weight (0.5–5 kg). These values are reference ranges and must be verified for the specific model and application. The assembly is designed for use in tanks or vessels where liquid level monitoring is required, and it interfaces with indicators, switches, or electronic transmitters. When selecting a float assembly, consider the process media, temperature, pressure, and required accuracy. Verify that the materials are compatible with the media and that the operating limits match the process conditions. Regular maintenance includes checking for fouling, corrosion, or damage to the float and linkage. Failure modes include loss of buoyancy due to leakage, mechanical wear, or signal drift. Always consult the manufacturer's documentation for installation, calibration, and maintenance procedures.

Working Principle

The float, being buoyant, rests on the liquid surface. As the liquid level rises or falls, the float moves vertically. This movement is transferred through a stem, arm, or magnetic coupling to a mechanical indicator, switch, or electronic transmitter. The transmitter converts the float's position into a readable level measurement, which can be used for indication, control, or monitoring.

Common Materials

Stainless Steel, Polypropylene, PTFE (Teflon), Hastelloy

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	15–100 mm	Common pipe sizes for tank connectionsISO 6708
Float Diameter	50–200 mm	Determines buoyancy and response to level changes
Float Material	304/316L	316L for corrosive mediaASTM A240
Operating Temperature	-40–150 °C	Above 150°C use high-temp alloys
Sealing Class	A–C	Class A for zero leakage
Stroke Length	10–300 mm	Travel distance of float for full valve actuation
Repeatability	±0.5 mm	Consistency of level detection
Ingress Protection	IP54–IP65	IP65 for outdoor or washdownIEC 60529
Weight	0.5–5 kg	Affects installation and buoyancy

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Float Body Part
Provides buoyancy to follow liquid level changes; typically hollow and sealed

Material: Stainless steel, plastic, or specialty alloy
Stem/Rod Part
Connects float to mechanical linkage or transmitter; transfers vertical movement

Material: Stainless steel, brass, or rigid polymer
Magnet Assembly
In magnetic level gauges: contains magnets that couple float movement to external indicator

Material: Rare earth magnets with protective casing
Guide/Stabilizer Part
Keeps float aligned vertically and prevents rotation or sticking in the chamber

Material: Stainless steel, PTFE
Seals/Gaskets Part
Prevents leakage in pressurized applications; seals between moving parts

Material: Viton, EPDM, PTFE

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Level Gauge

View system integration details

Manufacturers of Float Assembly

Manufacturer profiles associated with Float Assembly.

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Frequently Asked Questions

What materials are available for the float?

The float can be made from stainless steel, polypropylene, PTFE (Teflon), or Hastelloy, depending on the application's chemical compatibility and temperature requirements.

What is the typical operating temperature range?

The reference operating temperature range is -40°C to 150°C. For temperatures above 150°C, high-temperature alloys may be required. Always verify with the manufacturer for your specific process.

How does the float assembly transmit level information?

The float's vertical movement is transferred via a stem, arm, or magnetic coupling to a mechanical indicator, switch, or electronic transmitter, which converts the position into a level measurement signal.

What standards apply to the float assembly?

Relevant standards include ISO 6708 for nominal diameter, ASTM A240 for float material, and sealing class, and IEC 60529 for ingress protection. These are reference standards; verify compliance with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	0 to 10 bar (gauge)
flow rate:	Not applicable (static level measurement)
temperature:	-40°C to 150°C
slurry concentration:	Up to 30% solids by weight (dependent on particle size)

Float Assembly

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