In industrial weighing and material measurement scenarios, the load cell acts as the core component, and the selection of the model directly determines the accuracy of the weight data, the lifespan of the equipment, and even the stability of the entire production flow. Many newcomers often overlook key details during selection, leading to accuracy deviation, sensor damage, and other issues later on. Today, we will summarize 5 core selection points for load cells. New users are advised to save this for future reference when selecting models!
I. Rated Capacity: Choose "Enough," Not "Just Enough"—Safety Margin is Key
Rated capacity, simply put, is the maximum weight the sensor can bear. However, when selecting a model, you should never choose "just enough."
For example, if you need to weigh 2 tons of material, selecting a sensor with a 2t rated capacity might seem logical, but it ignores the "unexpected situations" that occur during actual use—the impact force of material being dispensed and the vibration during equipment operation can cause the actual load to far exceed 2t. In the long run, this will not only lead to accuracy decline but also shorten the sensor's lifespan.
The correct calculation method is: Weighed Material Weight $times$ 1.5-2 Times Safety Factor. The result is the appropriate rated capacity. Taking 2t of material as an example, $2t times 1.5 = 3t$. Choosing a 3t sensor at this point ensures weighing accuracy and effectively handles sudden loads, extending the lifespan.
If the equipment is supported by multiple points, such as a batching silo or reactor, an additional step is required: (Weighed Material Weight + Equipment Dead Weight) $times$ Safety Factor $div$ Number of Support Feet. The result is the rated capacity for a single sensor. For example, a 10t reactor supported by 4 feet. Calculating with a 1.5 times safety factor: $(10t times 1.5) div 4 = 3.75t$. Choosing a 4t sensor at this point provides greater stability.
II. Accuracy Class: Select as Needed, Don't Be Blind—"Sufficient is Best"
The accuracy class of a load cell directly affects data error. Common accuracy classes on the market are C1, C2, and C3, ranked in order of better accuracy: C3 > C2 > C1. Even higher accuracy classes are available, such as C4, C5, and C6 (suitable for laboratory and high-precision measurement scenarios).
Many people believe that "the higher the accuracy, the better," but in reality, higher accuracy means higher cost, and blindly pursuing high-end accuracy can lead to waste. Selection should be based only on actual needs:
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For ordinary piece counting or rough measurement (e.g., sand and gravel batching), C1 or C2 accuracy is sufficient.
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For scenarios with higher accuracy requirements, such as food ingredient batching or pharmaceutical weighing, C3 and higher accuracy should be considered.
The core principle is to choose the accuracy class that provides the highest cost-performance ratio while meeting usage requirements, without unnecessarily pursuing the "peak performance."
III. Rated Temperature: Do Not Ignore Environmental Temperature, Choose a "Temperature-Resistant Model" for Special Scenarios
The core components of a sensor are sensitive to temperature. Only when operating within the rated temperature range can the accuracy and lifespan be guaranteed.
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