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Oilfield weight indicator The main function of the weighing sensor
is to convert gravity into a measurable electrical signal, thereby
achieving accurate measurement of weight. Weighing sensor is a
device that converts mass signals into measurable electrical signal
outputs. Its core working principle is based on the measurable
changes of certain physical properties caused by changes in
external forces.
Working principle Weighing sensors usually use the strain effect.
When external force acts on the elastic element of the sensor, the
elastic element will deform, and the strain gauge attached to it
will also deform, causing the resistance value of the strain gauge
to change. By measuring the change in resistance value, and after
specific circuit conversion and signal amplification processing, an
electrical signal proportional to the applied external force can be
obtained, and then the weight of the object can be determined.
Types and characteristics Resistive strain type weighing sensor:
The most widely used, with the advantages of simple structure, high
precision, strong reliability, etc., suitable for a variety of
harsh industrial environments. However, its disadvantage is that it
is sensitive to temperature changes and requires effective
temperature compensation measures.
Capacitive weighing sensor: It measures weight based on changes
in capacitance, has high precision and good dynamic response
characteristics, and is less affected by environmental factors such
as temperature and humidity. However, its cost is high, and the
circuit design and debugging are complicated.
Piezoelectric weighing sensor: It uses the charge change
generated by piezoelectric materials when they are subjected to
force to measure weight. It has the advantages of fast response
speed and good high-frequency characteristics, and is suitable for
dynamic weighing and impact force measurement. However, its
low-frequency performance is poor and it is not suitable for static
or slowly changing load measurement.