As of January 2021, the Flow-X/M, X/S and X/K are certified for C1D2 and ATEX/IECEx Zone 2, with a wide operating temperature range of -40°C to 75°C (-40°F to 167°F) at 5% to 95% humidity. This makes Flow-X the only certified, high-accuracy flow computer that can be used both in the control room and the field, providing a single, cost-effective solution for all custody transfer applications. Custody transfer is also known as fiscal metering or royalty metering.

Flow-X/M module is the building block for all Spirit^IT flow computer products and enclosures. Each module provides IO and communication ports to accommodate any gas or liquid flow metering system, including high-accuracy 4-20 mA inputs, dual pulse inputs and double chronometry proving. The device is configurable and operable from a touch screen or a web browser over a secure HTTPS link.

The standard application software, available in both metric and US customary units, provides comprehensive and configurable measurement and control functionality, eliminating the need for programming for most installation. Virtually unlimited customization is possible with the complimentary Flow-Xpress software.

Flow-X is able to control the flow rate, block valves, sampling systems, proving systems, multi-product pipelines (batching) LACT racks and liquid loading and unloading systems, which eliminates the need for an additional PLC or a sampler controller.

Flow-X seamlessly integrates with the ABB Spirit^IT metering supervisory and measurement data management software.