This is a piezoresistive force sensor from Tekscan. The harder you press, the lower the sensor’s resistance. The sensor itself is thin and flexible, but the resistance does not change while being flexed. Resistance changes only when pressure is applied to the round area at the end of the sensor.
The sensor has a force range of 0 – 25 lb. The force ranges stated are approximations. The dynamic range of this small, versatile force sensor can be modified by changing the drive voltage and adjusting the resistance of the feedback resistor.
FlexiForce sensors are compared to other force sensors more linear, have less drift, have better rehabilitation, have a wider range, and are less sensing area dependent.
Linearity (Error): < ±3% of Full Scale (Line drawn from 0 to 50% load)
Repeatability: < ±2.5% (Conditioned Sensor, 80% of Full Force Applied)
Hysteresis: < 4.5 % of Full Scale (Conditioned Sensor, 80% of Full Force Applied)
Drift: <5% / logarithmic time (Constant Load of 25 lb (111 N))
Response Time: < 5 µsec (Time required for the sensor to respond to an input force; Impact load – recorded on Oscilloscope)
Operating Temperature: -40°C – 60°C (-40°F – 140°F)
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