FlexiForce A401 Sensor

FlexiForce A401 Sensor

Standard sensor with a large sensing area.

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FlexiForce™ A401 Sensor

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The A401 has a 2-pin connector. This is our standard sensor with the largest sensing area: 25.4 mm (1 in.). A401 sensors are available in one force range: 111 N (0 - 25 lb).* The force ranges stated are approximations. The dynamic range of this large force sensor can be modified by changing the drive voltage and adjusting the resistance of the feedback resistor.

How to Adjust the Force Range:

* Measurement ranges of 0-1 lb and 0-7,000 lb are achievable with the A401 sensor by utilizing the recommended circuitry. The force range can be extended by reducing the drive voltage, VT, or the resistance value of the feedback resistor, RF. Conversely, the sensitivity can be increased for measurement of lower forces by increasing VT or RF. For an alternative to the recommended circuit, see the Related Electronics tab.

A401 circuit diagram

Typical Performance

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)††

Acceptance Criteria: ±40% sensor-to-sensor variation

All data above was collected utilizing an Op Amp Circuit. If your application cannot allow an Op Amp Circuit, consult the FlexiForce Integration Guide, or contact a FlexiForce Applications Engineer

†† Force reading change per degree of temperature change =  0.36%/ºC (±0.2%/ºF)


Force Sensor Length: 
2.24 in
Sensing Size (Diameter/Width): 
1.000 in
Standard Force: 
25 lbs
7,000 lbs
Temperature Range (Low): 
-40 F
Temperature Range (High): 
140 F

Large sensing area

Sensor Output

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).

A401 chart