Separable extensometers are designed to offer strain measurement through non-violent specimen failure. They are engineered to conform to ASTM E83, and they utilize a linear variable displacement transformer (LVDT) to measure strain.
The high mechanical magnification of the PSM series’ design offers highly accurate readings and allows precise modulus measurements. The PSM series extensometers are also separable, allowing them to withstand attachment through non-violent specimen fractures.
Principle of Operation
The PSM series separable extensometer consists of two halves, each having two thumbscrews to hold the specimen in place. One half of the PSM series separable extensometer includes the measuring device and LVDT. The remaining half contains a hardened anvil. As the specimen elongates and the extensometer separates, the anvil moves through a path parallel to the axis of the specimen. The mechanical movement of the anvil is converted by the LVDT into a proportional electrical signal. This signal is then sent to the controller via the connector.
Separable extensometers are equipped with connectors that interface with current Instron controllers. All connectors are equipped with auto-calibration, and most have an auto-identification feature that allows the controller to recognize the extensometer that is being used. Instruments not equipped with the auto-identification feature can be set up with user codes for convenient use of the instrument. Extensometers can also be equipped with connectors to interface with Satec legacy controllers, such as MATS II, Apex, Vertex, Mark III, and Mark IV.