Provib Tech India Pvt. Offers Case Expansion Transducer for Steam Turbines. Provib Tech India Pvt. Is an ISO 9001 quality certified company. The Case Expansion Transducer for Steam Turbines features relative case expansion [due to thermo effect]. LVDTs can be used to measure the case expansion. The Case Expansion Transducer for Steam Turbines is available in three configurations. The range is from 25mm [1.0 inch] to 100mm [4.0 inches].