With this control system, the oilsupply to the cylinder is controlled. The servovalve is always under pressure. The higher losses of power for some applications requires an oil cooling. Each load frame connected to a common Powerbox needs its own servo valve adapted to the corresponding power requirementand directly located at the cylinder. The advantages of this type of control are, for example, minimum reaction times and high control accuracies, which are particularly needed for research and develop- ment tasks. All the corresponding units are integrated in one working table. This table is at the same time used for some models as a support table for the measurement and control system

Configurations of thetesting machines

Afflux control Job-specific testing machines andsystems are created with the above mentioned modules, thus offering many different solutions: from the pragmatic single-purpose testing machine for the standard quality control via testing machine combinations for the simple and quick change between compression and bending tests up to the demanding testing system for research jobs. ToniTROL and for the testing framecombination ToniPRAX for example.The load application speed can becontrolled alternatively in 2 ways: With the bypass control, the pistonmovement is controlled via the backflow of the pressure oil to the tank. This means that only the actually required amount of pressure is built up in the cylinder. Due to the minimum power loss the oil does not need to be cooled. With a servo valve integrated in the Powerbox, all the connected load frames can be operated. For this reason this type of control is particularly economic and has a long life.

Displacement anddeformation transducer

Bypass control The following transducer systems forthe determination of the specimen deformation with corresponding measurement electronics and soft- ware can be connected to ToniPRAX ToniTROL :•piston displacement transducer •transducer for the measurementof the separation between the compression platens•transducer for the measurementof the specimen deflection•transducer for the time-synchronous measurement of the longitudinal and transverse strain for the determination of the Young’s modulus of elasticity.With these transducers, the testspeed can also be regulated in dependence on the displacement or the deformation resp. So even after the reduction in force after the incipient crack, the test may be continued at a constant speed in order to measure the adhesive strength of steel fibres in the concrete. is a compact testing machine combination for standard tests in the laboratory for binders. TONICOMP V is the optimised cement testing machine with an integrated pneumatic unit for sample centering and safety cage movement. ToniNORM is a modular system which can be freely combined and which is suitable for the efficient and economic testing of the strength of building materials of any type. Load frames for the compressive and bending strength with a test load capacity
Deformation transducer for the determinationof the Young´s modulusDeformation transducer for the PCI-cube testTransducer for measuring the bendingdeformation 19