What is NRF81?

• The NRF81 Tankside Monitor (sometimes called Tankside Monitor NRF81 or simply “NRF81”) is a field device / gateway used in tank gauging systems, especially for bulk storage tanks (e.g. in terminals, refineries, tank farms).
• Its role is to integrate, monitor, and relay data from various sensors on a tank (level, temperature, pressure, etc.) to higher-level inventory or control systems.
• It is commonly used in custody transfer or inventory control applications (i.e. measuring and accounting for the volume/mass of fluid in the tank).

Key Functions & Capabilities

Here are some of the main functions and features of NRF81:

Technical / Performance Highlights

• Supports SIL2 (and in some redundant/homogeneous setups, SIL3) safety levels.
• Up to 6 relay outputs for alarms and safety functions.
• Wide range of output options: analog, HART, digital (Modbus, V1).
• Operating / ambient temperature range: typically –40 °C to +60 °C
• Power supply: AC 85–264 V (often)
• Intrinsically safe (i.s.) power/communications to connected field sensors in hazardous zones.