Hydrostatic Levelling System Going Mobile

The LHC Collimator Survey Train has alreadyshown that automated survey measurements in theLHC are technically feasible [1]. Nevertheless manyconstraints apply when making automated measure-ments in an accelerator environment. The researchof adapted measurements techniques and strategiesis an essential part in the development process ofa new generation survey train. From the automa-tion point of view, the measurements in the verticalplane are particularly challenging and one solutionwould be the use of a Hydrostatic Levelling System.They are frequently used in high precision monitoringapplications but with a few compromises a mobileand very flexible version can be build. This paperdescribes the approach, development and tests of amobile HLS which is able to cope with the constraintsand boundary conditions given by the LHC.