24 Apr 2024


Load cells are a crucial component in many industries, providing accurate measurements of weight and force. However, understanding their output can sometimes be confusing, especially when it comes to converting the millivolt (mV) signal they produce to kilograms. In this article, we will delve into the intricacies of load cell output and provide guidance on converting mV to kg.

Load cells work by converting force or weight into an electrical signal, typically in the form of millivolts. This signal is then amplified and processed by instrumentation to produce a readable value in kilograms or pounds. The key to understanding load cell output lies in knowing the relationship between the mV output and the weight applied to the load cell.

Each load cell has a sensitivity rating, which indicates how many mV of output the load cell generates for every unit of weight applied. This rating is typically expressed as mV/V, where V represents the excitation voltage supplied to the load cell. For example, a load cell with a sensitivity of 2 mV/V will output 2 millivolts for every volt of excitation voltage applied.

To convert the mV output of a load cell to kilograms, you will first need to determine the sensitivity rating of the load cell. This information can usually be found on the load cell datasheet or on the load cell itself. Once you have the sensitivity rating, you can use the following formula to convert the mV signal to kilograms:

Weight (kg) = (mV output ÷ (excitation voltage x sensitivity)) x maximum capacity of the load cell

For example, let’s say you have a load cell with a sensitivity rating of 2 mV/V, an excitation voltage of 5V, and a maximum capacity of 100 kg. If the load cell outputs 10mV, the weight applied to the load cell would be calculated as follows:

Weight (kg) = (10mV ÷ (5V x 2mV/V)) x 100 kg
Weight (kg) = (10mV ÷ 10mV) x 100 kg
Weight (kg) = 1 x 100 kg
Weight (kg) = 100 kg

By understanding the relationship between load cell output in mV and weight, you can accurately convert the electrical signal to a readable value in kilograms. This knowledge is essential in ensuring the reliability and accuracy of your measurement systems, ultimately leading to better decision-making and improved process control.

In conclusion, load cell output can be converted from millivolts to kilograms by using the sensitivity rating, excitation voltage, and maximum capacity of the load cell. By following the formula provided in this article, you can easily determine the weight applied to a load cell based on its electrical signal output. This understanding is invaluable in various industries where precise weight measurements are required, such as manufacturing, logistics, and research.

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