Bimetallic Coil: Temperature Range -40°C to +120°C

Component Specifications

Definition

A bimetallic coil is a precision mechanical component consisting of two dissimilar metal strips bonded together, which coil or uncoil predictably with temperature changes due to differential thermal expansion coefficients. In gauge movements, it provides thermal compensation to maintain measurement accuracy across varying environmental temperatures.

Working Principle

Operates on the principle of differential thermal expansion: when temperature changes, the two bonded metals expand or contract at different rates, causing the coil to wind or unwind. This mechanical movement is precisely calibrated to compensate for temperature-induced errors in gauge mechanisms.

Materials

Typically composed of Invar (low expansion alloy) bonded with brass or nickel-iron alloys; alternative combinations include steel/copper or specialized alloys for specific temperature ranges.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Accuracy	±0.5% FS over compensated range
Sensitivity	0.5-5° angular deflection per °C
Coil Diameter	5-50 mm
Strip Thickness	0.1-0.5 mm
Temperature Range	-40°C to +120°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 376, DIN 16086

Parent Products

This component is used in the following industrial products

Gauge Movement

The internal mechanism of a temperature gauge that converts thermal expansion into pointer movement.

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Engineering Analysis

Risks & Mitigation

Material fatigue from cyclic temperature changes
Corrosion at metal interface
Calibration drift over time

FMEA Triads

Trigger: Repeated thermal cycling
Failure: Fatigue cracking at coil ends
Mitigation: Use fatigue-resistant alloys and stress-relief annealing during manufacturing

Trigger: Moisture ingress
Failure: Galvanic corrosion at bimetal interface
Mitigation: Apply protective coatings and ensure proper sealing in gauge assembly

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.25% of full scale over compensated temperature range

Test Method

ISO 376 thermal cycling test with reference standards

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 Bimetallic Coil

Manufacturer profiles associated with Bimetallic Coil.

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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

What is the primary function of a bimetallic coil in gauge movements?

To provide automatic temperature compensation, ensuring measurement accuracy remains stable despite environmental temperature fluctuations.

How does material selection affect bimetallic coil performance?

Material pairs with higher differential expansion coefficients increase sensitivity, while specialized alloys can extend operational temperature ranges and improve corrosion resistance.

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.

Bimetallic Coil