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The Difference Between Weighing Sensors and Force Sensors

2025-10-10

1. Core measurement object

Weighing sensor: Mass

Force sensor: Force

2. Measurement Principle

Weight sensor: Measures the gravitational force acting on an object

Force sensor: Measures any type of force or torque

3. Units of Measurement

Weighing sensors: g, kg, t, etc.

Force sensors: N, kN, MN, etc.

4. Measurement Range

Weighing sensor: g ~ several hundred tons

Force sensor: Tens of mN to tens of MN

5. Operating Temperature

Weighing sensor: -10 ~ 40

Force sensor: High and low temperatures, -40°C to several hundred degrees Celsius

6. Loading Time

Weighing sensor: Typically features short single-measurement times.

Force sensor: Long loading time

7. Loading Direction

Weighing sensor: Typically unidirectional, with force directed toward the center of the Earth.

Force sensor: unidirectional, bi-directional (tension and compression), with free installation allowing forces in any direction.

8. Installation Frequency

Weighing sensor: Typically, a limit device is required to prevent lateral forces from causing interference.

Force sensor: Multiple designs, with installation structures tailored to the measurement direction.

9. Parasitic Load

Weighing sensor: The force-bearing condition is relatively ideal.

Force sensor: Consider the ability to withstand parasitic loads, and when necessary, opt for a multi-component sensor for accurate measurement.

10. Calibration Method

Weighing sensor: Usage Known mass standard weights Perform calibration

Force sensor: Usage Standard Power Source Perform calibration

11. Typical Applications

Weighing sensors: floor scales, platform scales, hopper scales, belt scales

Force sensor: Material testing machines, robotic joints, thrust testing, industrial process control

12. Design Focus

Weighing sensor: High precision, long-term stability, and resistance to off-center loading

Force sensor: Multi-directional force measurement, dynamic response, overload protection

Can they be used interchangeably?

In some cases, they can be used interchangeably, but they’re usually not the best choice.

Measure thrust using a load cell Theoretically, it’s possible, but the thrust must be applied smoothly and vertically downward, while avoiding any lateral forces. As for dynamic, non-vertical…

Direct thrust measurements result in poor performance from the load cell.

Use a force sensor to weigh. : Absolutely possible, and quite common. For example, many industrial platform scales use tension sensors. Or made with pressure-type force sensors. But

Please note that the reading unit is "newtons." If you want to obtain the value in "kilograms," you’ll need to perform a conversion within the instrument (mass = force / g). Due to gravity

The acceleration due to gravity, \( g \), varies slightly depending on the location, and for ultra-high-precision weighing, this conversion can introduce minor errors.

Summary

Concept scope: Force Sensor > Weighing Sensor

The fundamental difference: A weighing sensor measures mass (via gravity), while a force sensor measures force.

Selection criteria: If your ultimate goal is to know the mass of an object, prioritize choosing a weighing sensor.

If you need to measure process force, mechanical force, thrust, tension, or torque, choose a force sensor.