High Capacity Automotive Micro Load Cells CZL913E For Baby Body Scales
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High Capacity Automotive Micro Load Cells CZL913E For Baby Body Scales
Quick details
Introduction
A load cell is a force sensing module - a carefully designed metal
structure, with small elements called strain gauges mounted in
precise locations on the structure. Load cells are designed to
measure a specific force, and ignore other forces being applied.
The electrical signal output by the load cell is very small and
requires specialized amplification. Fortunately, the 1046
PhidgetBridge will perform all the amplification and measurement of
the electrical output.
Product specifications
NumberType="1" TCSC="0" w:st="on">5mm 4-wire shielding cable)
How they work
Strain-gauge load cells convert the load acting on them into electrical signals. The measuring is done with very small resistor patterns called strain gauges - effectively small, flexible circuit boards. The gauges are bonded onto a beam or structural member that deforms when weight is applied, in turn deforming the strain-gauge. As the strain gauge is deformed, it’s electrical resistance changes in proportion to the load. The changes to the circuit caused by force is much smaller than the changes caused by variation in temperature. Higher quality load cells cancel out the effects of temperature using two techniques. By matching the expansion rate of the strain gauge to the expansion rate of the metal it’s mounted on, undue strain on the gauges can be avoided as the load cell warms up and cools down. The most important method of temperature compensation involves using multiple strain gauges, which all respond to the change in temperature with the same change in resistance. Some load cell designs use gauges which are never subjected to any force, but only serve to counterbalance the temperature effects on the gauges that measuring force. Most designs use 4 strain gauges, some in compression, some under tension, which maximizes the sensitivity of the load cell, and automatically cancels the effect of temperature. Other types of load cell exist which have half bridges (2 strain gauges) or quarter bridges but they require additional hardware to operate since you must complete the bridge to get the most accurate readings.
What is a Wheatstone bridge?
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