Potentiometer/Variable Resistor: Resistance Range 100Ω to 10kΩ

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

Parameter	Typical range	Notes & selection driver
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

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

Standards

ISO 16380, DIN 43760, SAE J1930

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

Typical Suppliers & Equivalents

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

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Potentiometer/Variable Resistor

Manufacturer profiles associated with Potentiometer/Variable Resistor.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Potentiometer/Variable Resistor