[en] Converlgx is a program specifically designed for the shakedown testing of pressure vessels using a Compulog II data logger. It not only records data from strain gauge channels but also controls the pressure cycling of the test. The pressure cycling is determined either on a time basis or on the stability of a few selected strain gauges. The latter ensures that cold creep is complete. This program is a modified and extended version of Converlog which is itself a program written by Intercole Systems for logging strain gauges. Full details of the program together with instructions for its operation are given. (author)