IEC 61518 pdf download.Mating dimensions between differential pressure (type) measuring instruments and flanged-on shut-off devices up to 41 3 bar (41 ,3 MPa) 1 Scope This International Standard is applicable to differential pressure (type) measuring instruments (instrument) with a shut-off device (manifold) directly bolted on to them. This standard specifies mating dimensions and tolerances, threads, bolts, and gaskets for a...