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:

Feature	Description
Sensor integration	Can connect to radar gauge, temperature probes, pressure transmitters, etc.
Tank calculations / corrections	Performs volume, density, or level corrections (e.g. to account for temperature or tank deformations)
Alarm outputs / relays	Has multiple SIL-rated relay outputs for alarms or safety functions
Communication interfaces	Supports several protocols: Modbus RS-485, V1, HART, analog 4–20 mA outputs, etc.
Safety & approvals	Designed for use in hazardous areas, with explosion protection and compliance with safety standards (e.g. SIL2 / SIL3)
Enclosure & robustness	Rugged enclosures (e.g. IP66 / IP68, NEMA 4X / 6P) to handle harsh conditions
User interface & display	Has local display (LCD) and touch control (in safe version) to show measured/calculated values on site.

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.

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