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The following information is designed to assist in obtaining or providing the necessary information required to select a suitable standard load cell or provide the details required to offer a custom design load cell solution.
There are many factors that determine the suitability of a load cell for a given application or installation:
Maximum operating load, force or weight – determine the maximum operating load, force or weight that the load cell will physically see in the application. This will ultimately determine the rated load of the load cell.
Maximum measurement load, force or weight – determine what the maximum measurement load force or weight that the load cell needs to measure whilst in the application. This may not necessarily be the maximum that it will see during use, and may have an effect on accuracy requirements (discussed later).
How is the load cell loaded? – determine the way that the load cell is to be loaded i.e. in tension, compression or tension and compression.
Measurement units – confirm the engineering units that the measurement will be defined in. This may help with instrumentation selection. Some popular options are tonnes (te), kilonewtons (kN), meganewtons (MN), grams (g), kilograms (kg) and pounds (lb), but other specific units can also be considered.
Accuracy – determine the loading accuracy required for non-linearity and repeatability. This is normally expressed as ±% of full scale output (±%FSO), where full scale output is essentially the rated load of the load cell.
Thermal errors – for high accuracy applications in wide temperature ranges it may be necessary to temperature compensate a load cell. Determine the thermal errors required. This is normally expressed as ±% full scale output per ˚C or ˚F (±%FSO/˚C or ±%FSO/˚F). The standard non-compensated thermal shift on most of LCM System load cells is <±۰٫۰۱%FSO/˚C.
Adverse Loading Conditions
Overloading conditions – will the applied load ever exceed the maximum load? If so, by how much? This will determine the overload capacity required and to what level we will need to proof load the load cell to.
Overloading capacity – are there any additional safety factors that need to be considered for the application? This will determine the overload capacity required and to what level we will need to proof load the load cell to.
Attachment options – there are various ways that a load cell could be installed/attached in an application and which may influence the load cell choice. In addition to any customer specific requirements, these may include:threaded joints
sources – with special thanks, hats off to you all
جولای 23, 2019