Rosemount TankRadar Rex has recently been assessed by a third party (Exida) and is considered suitable for use in SIL 2 safety functions in accordance with IEC 61508/61511. The safety function is based on the relay (switch) outputs. One relay, or a combination of two, can be used for overfill or dry run protection.

Although the decision to incorporate proven-in-use devices is always with the end user, the assessment by Exida provides a good basis for the implementation of a plant safety strategy in accordance with section 11.5.3 of IEC 61511.