INDUSTRY COMPONENT

Potentiometer/Variable Resistor

Variable resistor component for fuel level sensing in automotive applications

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Component Specifications

Definition
A potentiometer or variable resistor is an electromechanical component used in fuel level sensors to convert the mechanical position of a float arm into a variable electrical resistance, providing continuous analog measurement of fuel volume in automotive fuel tanks.
Working Principle
Operates on the principle of variable resistance through a sliding contact (wiper) moving along a resistive track. As the float arm moves with fuel level changes, the wiper position changes, altering the resistance between terminals proportionally to fuel volume.
Materials
Resistive element: Carbon film, cermet, or conductive plastic; Wiper: Phosphor bronze or beryllium copper; Housing: Thermoplastic (PBT, PPS) or metal; Terminals: Brass or copper alloy with tin plating
Technical Parameters
  • IP Rating IP67 for fuel immersion applications
  • Linearity ±3% to ±10%
  • Tolerance ±10% to ±20%
  • Power Rating 0.25W to 0.5W
  • Mechanical Life 50,000 to 100,000 cycles
  • Resistance Range 100Ω to 10kΩ
  • Operating Temperature -40°C to +125°C
Standards
ISO 16380, DIN 43760, SAE J1930

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Potentiometer/Variable Resistor.

potentiometer variable resistor fuel level sensor automotive sensor resistive component fuel gauge analog sensor float-type sensor Potentiometer/Variable Resistor Potentiometer/Variable Resistor in Motor Vehicle Manufacturing

Parent Products

This component is used in the following industrial products

Fuel Level Sensor

A sensor that measures and monitors the amount of fuel remaining in a fuel tank.

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Engineering Analysis

Risks & Mitigation
  • Resistive track wear over time
  • Fuel contamination affecting electrical contact
  • Mechanical binding of float mechanism
  • Temperature-induced resistance drift
FMEA Triads
Trigger: Abrasive wear of resistive track
Failure: Increased resistance variation, nonlinear output
Mitigation: Use conductive plastic tracks with lubricants, implement protective coatings, regular calibration
Trigger: Fuel additive contamination
Failure: Corrosion of wiper contact, increased contact resistance
Mitigation: Select corrosion-resistant materials (beryllium copper), implement sealed housing design
Trigger: Mechanical binding of float arm
Failure: Stuck sensor reading, inaccurate fuel level indication
Mitigation: Precision bearing design, regular maintenance, debris protection

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Resistance tolerance ±10%, linearity tolerance ±5% for automotive applications
Test Method
ISO 16380 for automotive fuel level sensors, including immersion testing, temperature cycling, and vibration resistance testing

Buyer Feedback

★★★★☆ 4.5 / 5.0 (9 reviews)

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"Great transparency on the Potentiometer/Variable Resistor components. Essential for our Motor Vehicle Manufacturing supply chain."

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Frequently Asked Questions

How does a potentiometer work in a fuel level sensor?

The potentiometer converts mechanical float arm movement into variable electrical resistance. As fuel level changes, the float moves, changing the wiper position on the resistive track, which alters the output resistance proportionally to fuel volume.

What are common failure modes of fuel level potentiometers?

Common failures include resistive track wear, wiper contact degradation, mechanical binding of float arm, and contamination from fuel additives causing increased resistance or open circuits.

Can potentiometer-based fuel sensors be used with ethanol-blended fuels?

Yes, but materials must be compatible. Special resistive tracks and wiper materials resistant to ethanol corrosion are required, along with sealed housings to prevent fuel ingress affecting electrical performance.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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