Wheatstone Bridge Circuit for Force Sensors

Product Specifications

Technical details and manufacturing context for Wheatstone Bridge Circuit

Definition

The Wheatstone Bridge Circuit is a fundamental electronic component used in force sensors to convert mechanical strain into measurable electrical signals. It consists of four resistors arranged in a diamond configuration, with one or more resistors being strain gauges that change resistance when force is applied. This circuit provides high sensitivity and accuracy for detecting minute resistance changes, making it essential for precise force measurement applications. The bridge operates on the principle of null detection: when a voltage is applied across the bridge, the circuit is balanced (zero voltage difference between the midpoints) when the ratio of resistances in the two legs is equal. In force sensors, applied force causes strain gauges to change resistance, unbalancing the bridge and producing a measurable output voltage proportional to the force. Typical parameters include an excitation voltage of 5–15 V DC, bridge resistance of 120–1000 Ω, measurement accuracy of ±0.1%, resistance tolerance of ±0.01–±0.1%, temperature coefficient of ±5–±25 ppm/°C, operating temperature of -40–85 °C, storage temperature of -55–125 °C, humidity range of 5–95% RH, ingress protection of IP54–IP65 (per IEC 60529), insulation resistance of ≥100 MΩ at 500 V DC, dielectric strength of 500–1000 V AC for 1 minute, and weight of 0.5–2.0 kg. Materials typically include copper traces, silicon substrate, strain gauge elements, and protective coating. These values are reference ranges; verify model-specific specifications with the manufacturer.

Working Principle

The Wheatstone Bridge operates on the principle of null detection. When a voltage is applied across the bridge, the circuit is balanced (zero voltage difference between the midpoints) when the ratio of resistances in the two legs is equal. In force sensors, applied force causes strain gauges to change resistance, unbalancing the bridge and producing a measurable output voltage proportional to the force.

Common Materials

Copper traces, Silicon substrate, Strain gauge elements, Protective coating

Technical Parameters

Parameter	Typical range	Notes & selection driver
Excitation Voltage	5–15 V DC	Higher voltage increases sensitivity but may cause self-heating.
Bridge Resistance	120–1000 Ω	Common values: 120, 350, 1000 Ω.
Measurement Accuracy	±0.1 %	Depends on resistor tolerance and ADC resolution.
Resistance Tolerance	±0.01–±0.1 %	Precision resistors required for accurate balance.
Temperature Coefficient	±5–±25 ppm/°C	Low TCR minimizes drift with temperature.
Operating Temperature	-40–85 °C	Extended range available for industrial applications.
Storage Temperature	-55–125 °C	Non-operating storage limits.
Humidity Range	5–95 % RH	Non-condensing; condensation may cause leakage.
Ingress Protection	IP54–IP65	Higher IP for dusty or wet environments.IEC 60529
Insulation Resistance	≥100 MΩ	At 500 V DC between bridge and case.
Dielectric Strength	500–1000 V AC	Withstands voltage between bridge and case for 1 min.
Weight	0.5–2.0 kg	Depends on enclosure and mounting.

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

Strain Gauge Part
Converts mechanical strain into electrical resistance change

Material: Constantan or Nichrome foil
Bridge Resistors Part
Provide reference resistance values for bridge balancing

Material: Precision metal film or wire-wound resistors
Termination Pads Part
Electrical connection points for external wiring

Material: Gold-plated copper

Applied To / Applications

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

Force Sensor

View system integration details

Manufacturers of Wheatstone Bridge Circuit

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Frequently Asked Questions

What is the typical excitation voltage range?

The typical excitation voltage range is 5–15 V DC. Higher voltage increases sensitivity but may cause self-heating, so the actual value should be confirmed for the specific application.

What bridge resistance values are common?

Common bridge resistance values are 120, 350, and 1000 Ω, with a typical range of 120–1000 Ω. The choice depends on the strain gauge and measurement system.

What is the operating temperature range?

The operating temperature range is -40 to 85 °C, with a storage range of -55 to 125 °C. Ensure the environment does not exceed these limits to avoid damage.

What ingress protection ratings are available?

The ingress protection rating is IP54 to IP65 per IEC 60529. Higher IP ratings are suitable for dusty or wet environments; verify the specific rating for your model.

Data Basis

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

Preliminary Technical Classification

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pressure:	Atmospheric pressure only (not designed for pressurized environments)
other spec:	Maximum excitation voltage: 10V DC, Measurement accuracy: ±0.1% of full scale
temperature:	-40°C to +85°C (operational range for precision components)

Wheatstone Bridge Circuit

Product Specifications

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