How much error is induced if a FlexiForce sensor is not conditioned?

Question: How much error is induced if a FlexiForce™ sensor is not conditioned?

Answer: The error could be greater than the standard ±5% error if not conditioned prior to testing. You should always condition the sensor prior to use.

Link to this FAQ

Why do you need to condition a FlexiForce sensor?

Question: Why do you need to condition a FlexiForce™ sensor?

Answer: You should always condition the sensor prior to testing because the sensor's output changes the first few times it is loaded. By loading the sensor before your calibration, you will ensure that the sensor is producing repeatable results for your calibration and testing. It will also produce a repeatable drift curve. You can condition the sensor by loading it at 110% of your maximum load for a few cycles.

Refer to our Quick-Start Calibration Guide for more details.

Link to this FAQ

How do I connect a FlexiForce sensor after it has been trimmed?

Question: How do I connect a FlexiForce™ sensor after it has been trimmed?

Answer: If Tekscan trims the A201 sensors to two inches, four inches, or six inches, the sensor will come with three (3) male square pin connectors spaced at 0.1" (2.54mm). If you trim the sensor yourself, you will need to re-connect the sensor using one of two methods. You can purchase staked pin connectors and a crimping tool, or you can use a conductive epoxy to adhere small wires to each conductor.

Link to this FAQ

What is the resistance range of a FlexiForce sensor?

Question: What is the resistance range of a FlexiForce™ sensor?

Answer: The resistance range of the sensor is typically from  > 5MΩ at no load to approximately 5kΩ at full load. This can vary depending on the electronics being used to drive and read the sensor.

Link to this FAQ

What is the maximum recommended current for a FlexiForce sensor?

Question: What is the maximum recommended current for a FlexiForce™ sensor?

Answer: The maximum recommended current for the FlexiForce sensor is 2.5 mA.

Link to this FAQ

What drive voltages can I apply to a FlexiForce sensor?

Question: What drive voltages can I apply to a FlexiForce™ sensor?

Answer: 0.2V (as long as signal-to-noise (S/N) ratio remains acceptable) to 5V is the typical range.  The sensors output is also a function of the drive voltage/current therefore a constant voltage is recommended.

Link to this FAQ

How can I measure forces greater than 100 lbs?

Question: How can I measure forces greater than 100 lbs?

Answer: In order to measure forces above 100 lbs. (up to 1,000 lbs.), apply a lower drive voltage and reduce the resistance of the feedback resistor (1kΩ min.) The force ranges of the sensors are based on our electronics. Please refer to FlexiForce™ Specifications Table. If Using our ELF™ electronics, there is a feature in the software which allows you to decrease or increase the sensitivity of the sensor. Refer to your ELF manual for details.

Currently, the A201 and A301 model sensors are able to measure up to 1,000 lbs, whereas the A401 model sensors are able to measure up to 7,000 lbs. Keep in mind, that the A301 and A401 model sensors are currently not compatible with the ELF system.

Link to this FAQ

Can I adhere a FlexiForce sensor to a surface?

Question: Can I adhere a FlexiForce™ sensor to a surface?

Answer: If you need to adhere the sensor to a surface, a thin, double-sided tape is recommended. It is best to apply tape to the shaft of the sensor rather than underneath the sensing area. An adhesive (glue) can be used if it will dry evenly.

Link to this FAQ

Can I fold a FlexiForce sensor?

Question: Can I fold a FlexiForce™ sensor?

Answer: The sensor is designed to be flexible, however the sensing area should not be folded as this causes shearing. The traces should not be bent more than 90° as the silver conductive leads could break.

Link to this FAQ

What materials/conditions could damage a FlexiForce sensor?

Question: What materials/conditions could damage a FlexiForce™ sensor?

Answer: Temperatures >155°F (420°F if you are using High-Temp model HT201), water-submersion (as the adhesive holding the top & bottom layers together would likely separate), sharp objects, shear forces, creasing the sensor, and loads that are around or above 10,000 psi can damage the sensor. Refer to the FlexiForce Specifications table for sensor performance details.

Link to this FAQ