Views: 0 Author: Site Editor Publish Time: 2026-09-09 Origin: Site
A cantilever beam load cell measures force by sensing the slight bend of a beam held at one end. Think of a diving board attached to a pool deck. When you press down on the free end, the board bends. That bend shows the force applied.
This bending stretches strain gauges glued to the beam surface. The stretch changes electrical resistance, which turns into a readable weight number. This idea allows exact force measurement in many factory uses. For force checking, accuracy classes range from C3 to C6, as shown below.
Accuracy Class | Max Verification Intervals | Typical Application |
|---|---|---|
C3 | 3,000 | General industrial weighing |
C4 | 4,000 | Higher-resolution legal-for-trade |
C5 | 5,000 | Reference-grade applications |
C6 | 6,000 | Highest-resolution calibration |
This beam load cell design gives steady load measurement with few moving parts.
Cantilever beam load cells measure force by detecting how much the beam bends. Strain gauges change their resistance when the beam bends.
A Wheatstone bridge circuit turns resistance changes into voltage. That gives exact weight measurement.
Single-ended beams are good for lighter loads and tight spaces. Double-ended beams can handle heavy loads and off-center forces.
Use stainless steel load cells with IP68/IP69K in wet environments. They resist corrosion and withstand washdowns.
A cantilever beam load cell has a simple design. Picture a rectangular beam held at one end. That fixed end connects to your equipment. The other end, called the free end, takes the force you want to measure. This setup gives the load cell another name: a single-ended beam load cell. When you put weight on the free end, the beam bends down. That bending creates a measurable strain on the beam's surface. The design turns force into a readable signal.
The main part of this load cell is the metal beam, known as the elastomer. Makers often use stainless steel for this beam. For example, the WEBOWT WB702 uses 17-4PH stainless steel. This material resists corrosion well and lasts a long time. You can trust it in tough places like chemical plants or food processing lines.
The strain gauges are the heart of the measurement system. These tiny resistive parts attach directly to the beam surface. The metal foil inside these gauges is very thin. Haibo Sensor says the usual thickness is 0.003 to 0.01 mm. Hamilton Precision Metals makes precision foil as thin as 0.0001 inches (0.0025 mm). This thinness lets the gauge notice even tiny bends in the beam. When the beam bends, the foil stretches or squeezes, changing its electrical resistance. That change matches the amount of force applied.
A protective housing covers the whole assembly. The WB702 uses laser-welded sealing with IP68/IP69K protection. This blocks dust and water, so it works reliably. You can use it in washdown areas without concern. The housing also guards the strain gauges from physical harm.
This design works on a bending principle. That makes it different from other types. A shear beam load cell, for example, measures shear stress instead of bending. In a shear beam load cell, you place the load between two supports. The beam feels shear forces rather than a bending moment. The strain gauge placement also differs. The gauges sit at 45-degree angles to catch shear strain. In a beam load cell, gauges line up along the beam length to sense bending strain.
Compression load cells measure force by pressing down on a column or disc. You put the load on top of the cell. This design works for high-capacity jobs but lacks the low profile of a cantilever beam.
The bending principle gives unique benefits. You get a low profile that fits easily into platform scales and packaging machines. The focused strain at the fixed end provides high sensitivity. This allows accurate force measurement even with small forces. The design also makes calibration easier. You can adjust the output by changing the beam size or the strain gauge placement.
The single-ended design works well where space is tight. You see it in counting scales, belt scales, and hopper scales. Its ability to handle both static and dynamic loads makes it flexible. The 17-4PH stainless steel build ensures long life in tough conditions. With proper calibration, you can reach accuracy classes up to C6. The design allows precise load measurement in many industrial settings. The strain gauge technology ensures high accuracy in weight measurement.
When you apply a force to the free end of the beam, the beam bends downward. This bending creates strain, or deformation, on the beam surface. The strain concentrates at the fixed end, where the strain gauges attach. The amount of strain directly matches the force you apply. This relationship allows the beam load cell to turn force into a measurable electrical signal. The whole process starts with a simple mechanical action and ends with a precise weight reading.
Strain gauges are the sensing elements that detect this deformation. Each gauge contains a very thin metal foil, typically made of constantan. The foil's electrical resistance changes when it stretches or compresses. This change is proportional to the applied force. A small force creates a small resistance change. A large force creates a larger change.
The gauge factor (GF) quantifies this sensitivity. For a constantan metal foil strain gauge, the gauge factor is 2. This means the relative change in resistance equals twice the strain applied. The table below shows the gauge factor for common materials.
Material | Gauge Factor |
|---|---|
Metal foil strain gauge (constantan) | 2 |
Thin-film metal | 2 |
The gauge factor comes from this relationship: GF = (ΔR/R) / ε, where ΔR is the change in resistance, R is the unstrained resistance, and ε is the strain. This formula helps engineers design load cells with the right sensitivity for each application.
Temperature fluctuations directly affect strain gauge resistance. Without compensation, a 10°C rise in ambient temperature can cause output drift up to ±0.05% of full scale. This is unacceptable for high-accuracy tasks. The drift appears in two ways. Zero drift shifts the output when no load is present. Sensitivity drift changes how the gauge responds to the same load. The underlying mechanism is that temperature changes cause expansion or contraction of the elastic element, altering internal stress distribution.
To counter these effects, manufacturers use self-temperature-compensation (STC). They engineer strain gauges with low-temperature-coefficient materials. They also add thermistors to the Wheatstone bridge circuit. These thermistors automatically adjust the excitation voltage to stabilize the output. This keeps the force measurement accurate across different temperatures.
The tiny resistance changes from strain gauges require precise measurement. A Wheatstone bridge circuit provides this accuracy. The circuit connects four resistors in a diamond shape. In a load cell, you use four strain gauges, one on each side of the bridge. This configuration cancels out unwanted effects and amplifies the signal you want.
The bridge converts resistance changes into a measurable voltage output. For analog load cells, this output appears in millivolts per volt (mV/V) of excitation. Most standard load cells have a full-scale output of 1 to 4 mV/V. A value of 2 mV/V is very common for industrial weighing. The input impedance of the bridge circuit is typically one of these values:
350 Ω
700 Ω
Digital load cells, like the WEBOWT WB702, take this further. They include built-in analog-to-digital (AD) converters. These converters change the analog signal directly into a digital output. This approach offers higher precision and better noise immunity. You get a cleaner signal without interference from external electrical noise.
The combination of strain gauges and the Wheatstone bridge gives you reliable load measurement. You can measure weight accurately even in challenging environments. The design supports calibration for different accuracy classes, from C3 to C6. This makes the beam load cell suitable for a wide range of applications, from simple platform scales to complex industrial weighing systems. Understanding this process helps you appreciate the precision behind every weight reading.
The cantilever beam load cell you have learned about uses a single-ended design. You secure one end and put force on the free end. This setup works best for lighter loads. Single-ended beam load cells usually handle weights from 0.5 to 10 tons. They fit nicely in platform scales and packaging machines where space is tight.
Double-ended beam load cells, also called shear beam load cells, mount differently. You support both ends and place the load in the center. This design manages much heavier loads, from 1,000 lbs up to 100 tons. The double-ended shear beam load cell also handles off-center loads better than the single-ended type. When you put weight off-center on a single-ended beam, accuracy drops. The double-ended design spreads the force evenly across both supports.
Your pick between these two designs depends on your capacity needs and mounting limits. For lighter jobs with little space, go with the single-ended cantilever design. For heavy industrial loads where side forces may happen, choose the double-ended shear beam load cell. The table below shows the main differences.
Design | Capacity Range | Off-Center Load Resistance |
|---|---|---|
Single-ended beam | 0.5 to 10 tons | Requires centralized loading |
Double-ended beam | 1,000 lbs to 100 tons | More resistant to side loads |
You will find cantilever beam load cells in many factory settings. Low-profile platform scales use them for everyday weight checks. Packaging scales rely on their small size for exact filling. Belt scales need load cells with OIML Class C3 accuracy, which the cantilever design easily provides. Hopper scales also gain from this beam load cell's steady force reading.
Food processing and drug industries demand clean, rust-proof equipment. The WEBOWT WB702 Cantilever Beam Digital Load Cell meets these needs. Its 17-4PH stainless steel build resists rust from washdown chemicals. The IP68/IP69K protection rating handles high-pressure steam cleaning. You can trust this load cell in places where water and dust would ruin weaker equipment.
The WB702 offers capacities from 0.22t to 4.4t with accuracy classes C3, C6, and C10. Its CAN interface allows fast data transfer for real-time force tracking. The built-in fault self-check warns you about sensor issues before they disrupt your process.
When picking a load cell, think about four key points. First, figure out your needed capacity. Second, find the accuracy class required for legal-for-trade uses. Third, check your environment to select the right IP rating. Fourth, choose between analog and digital output. WEBOWT provides both choices, so you can match the load cell to your current control system. Proper calibration ensures your chosen load cell gives reliable weight readings for many years.
You now understand how a cantilever beam load cell works. This device measures force by detecting the bend in a beam fixed at one end. Strain gauges convert that bend into electrical signals through a Wheatstone bridge circuit. The design offers a low profile, high accuracy, and cost-effectiveness for many weighing tasks.
You can apply this knowledge across platform scales, packaging lines, and hopper systems. For demanding environments, choose a durable option like the WEBOWT WB702. Its stainless steel construction and IP68/IP69K protection withstand harsh conditions. International certifications, including OIML and CE, guarantee reliable measurement and calibration. Understanding this technology helps you appreciate the precision behind modern industrial weighing systems.
Attach the fixed end firmly to a solid base. The free end takes the load. Keep the force straight up and down and centered. If the load is off-center, accuracy drops. Also, make sure the mounting surface is flat and level so you get reliable readings.
The WEBOWT WB702 comes in accuracy classes C3, C6, and C10. C3 works well for general industrial weighing. C6 gives better resolution for legal-for-trade tasks. C10 offers the highest precision. Pick the class that matches what your force measurement job needs.
Yes. The WB702 has laser-welded sealing with IP68/IP69K protection. This rating keeps out dust and handles high-pressure steam cleaning. The 17-4PH stainless steel build resists rust from washdown chemicals. You can rely on this beam in food processing or pharmaceutical plants where water exposure happens every day.
Analog load cells send a millivolt signal that needs an external amplifier. Digital load cells, like the WB702, have a built-in AD converter. They send a clean digital signal through a CAN interface. Digital versions resist noise better and support self-diagnosis, which makes troubleshooting easier.
A shear beam load cell mounts with supports at both ends and measures shear stress. A cantilever beam load cell fixes at one end and measures bending. Choose the cantilever design for lighter loads and tight spaces. Pick a shear beam load cell for heavier capacities and better off-center load resistance.
