Lansmont verifies the performance of every Compression Test System we build.
We also verify the performance when the system is installed at the customer facility, and we recommend it be repeated at least once a year thereafter. We follow ASTM E4 as our reference standard, and use extremely accurate calibrated Gold Standard Precision load cells and digital force indicators manufactured by Interface.
This process generates documented evidence that our Compression Test Systems deliver accurate force data, traceable to NIST. We're in the process of improving our force verification procedures to extend the verified range for our test systems. Instead of the traditional five point force verification, we'll now verify compressive force with nine points.
These include the minimum and maximum values of the machine's verified force range as well as seven additional force settings in between. During a force verification, we ask the machine to apply predefined loads. We then verify the accuracy of the machine's reading by comparing it to the Gold Standard load cell's indicated force. The difference between the two load cells’ force readings must be less than +/- 1% for the readings to be “verified”.
If the difference is greater than +/- 1% then we adjust calibration values in the Lansmont controller to bring the system into calibration.
In addition to the annual ASTM E4 performance verification, we also recommend annual system maintenance to keep everything operating smoothly. Any time you need to relocate or reposition your lab equipment, the Compression System should also be re-verified. Please contact me - Casey Barnes - if you would like more information about our E4 force verification procedure or to schedule a service visit.
