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The ESS301 sensor is made from Tekscan's Enhanced Stability Series (ESS) pressure sensitive ink. This allows for better performance in a wider range of operating and storage conditions. ESS301 was developed with OEM customers in mind and designed to reached the majority of our OEM customer's test expectations.
ESS301 is available in one force range: 4.4 N (0 - 1 lb). 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 (see "How to Adjust the Force Range" within the Electronics tab on the left).
Sensor output is a function of many variables, including interface materials. Therefore, Tekscan recommends the user calibrate each sensor for the application. The graph below is an illustration of how a sensor can be used to measure varying force ranges by changing the feedback resistor (the graph below should not be used as a calibration chart).
Test Conditions: Input Voltage= 0.45V; Load Applied= 1lb; Measured Current= 79uA
Ideal for applications where high temperature and humidity are present
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: <3.8% / logarithmic time (Constant Load)
Response Time: < 5 µsec (Time required for the sensor to respond to an input force; Impact load - recorded on Oscilloscope)
Operating Temperature: -40°C - 85°C (-40°F - 185°F)
Acceptance Criteria: ±40% sensor-to-sensor variation
If your application cannot allow an Op Amp Circuit, consult the FlexiForce Integration Guide, or contact a FlexiForce Applications Engineer. If you prefer to build your own electronics, we recommend using a circuit similar to the diagram below. This will provide linear data, making it easier to calibrate the sensor.
*In order to measure higher forces, apply a lower drive voltage (-0.5 V, -0.25 V, etc.) and reduce the resistance of the feedback resistor (1kΩ min.) To measure lower forces, apply a higher drive voltage and increase the resistance of the feedback resistor.
The FlexiForce OEM Development Kit allows design engineers to economically obtain proof-of-concept data while determining how FlexiForce force sensors will behave within their product or application environment.
The FlexiForce Quickstart Board is a finished single voltage source circuit which can be quickly dropped into a prototype or easily designed into a product to obtain force measurements.
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