Delta Controls is pleased to announce that the CS range of Weatherproof, ATEX / IECEx Ex ia and Ex d Pressure, Switches have been assessed by Sira Certification Service and found to meet the requirements of IEC 61508-2:2010 as an element/subsystem suitable for use in safety related systems performing safety functions up to and including SIL 3 (1oo2) or SIL 2 (1oo1).