ISA TR84.00.08

Abstract

This technical report (TR) addresses wireless technology-based sensors that are used in Independent Protection Layers (IPLs) providing a risk reduction factor of less than or equal to 10 (non-SIS IPL) by the authority having jurisdiction (typically the owner/operator or local regulatory authority), and establishes guidance and considerations for their util ization in the process sector. The use of wireless technology for higher risk reduction factors such as a Safety Instrumented Function has been specifically excluded from consideration in the scope of this technical report. This TR does not address codes, regulations, and other requirements that apply only to the nuclear power industry. This TR provides guidance in design and maintenance of wireless sensors used in a non- SIS IPL. Recognizing that wireless sensor networks will have mixed data, not only risk reduction data but other process monitoring data as well, this TR applies to the wireless functions related only to risk reduction. This TR provides guidance for fixed wireless sensor networks and portable and traveling wireless sensors that may periodically move from one part of a facility to another. The guidance provided is applicable for the periods of time when the sensors are connected to the network. An example of a sensor that periodically moves is a temperature monitoring point on a rail car. Typical architectures for wireless sensor networks are shown in this TR; the guidance and considerations provided apply to both the sensor network as well as the associated wireless backhaul. This TR does not cover notification classification (for example, alarms and alerts) or personnel actions associated with alarms. Refer to ANSI/ISA-18.2-2016 (see References immediately following) for alarm requirements.