Calibration and recalibration checking device - for test probes of any kind in a pipe for flowing substances includes two valve elements

摘要

Two shut-off valve devices (6, 8) are provided in the pipe (4), one before and the other behind the test probe (2); their closing elements (3, 5) have at least one inlet (9) and one outlet (7) connected through an inlet (17) and/or outlet (18) channel with the external source or drain for the calibration medium; when the closing elements are in the closed position, which is the recalibration and/or calibration testing position, the inlet and outlet are in the pipe and point towards the test probe; when the closing elements are withdrawn, which is the measurement position, they are tightly closed by the guiding element for the corresponding closing element.