Based on its decades of expertise, Emerson is introducing its purpose-built Rosemount 8795 magnetic flow sensor for hydronic cooling of data center applications. This sensor provides accurate, repeatable flow measurements for high reliability and uptime in mission-critical data centers, while improving power usage effectiveness (PUE). It’s designed for building management system (BMS) settings, and fulfills common specifications to simplify selection, installation and commissioning.

Optimized for chilled-water and water-glycol cooling loops, Rosemount 8795 provides consistent performance across the 2-inch to 16-inch line sizes typically used in data center cooling loops. Its polytetrafluoroethylene (PTFE) liner and stainless-steel electrodes are specifically intended to serve in thermal management applications, and ensure dependable operations in closed-loop cooling systems. The sensor also has 5 µS/cm minimum conductivity, and optional universal power compatibility for AC or DC sources.

“We’re taking our reputation for quality, efficiency, reliability and 24/7 availability, and applying it to data centers that are increasingly liquid-cooled,” says Laura Chemler, product manager for magnetic and vortex flow meters at Emerson. “In the same way, we’ve used industrial problem-solving to create a robust, high-availability sensor like Rosemount 8795 to better meet data center specifications and building management system (BMS) requirements.

“The capabilities of this sensor and its magnetic flow transmitters make it easier for data center personnel to move cooling liquids with confidence. Users benefit from Emerson’s longtime reliability and installed base. Rosemount magmeters have been installed for decades, and they require virtually no maintenance because they have no moving parts like turbine meters. They also experience no pressure losses like insertion magmeters or DP flowmeters.”

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Data center designs are highly modular and scalable, and extensive straight runs in piping can sometimes be limited. Chemler adds that Rosemount 8795 can be invaluable here, too, because it supports Emerson’s new Short Run Install software. By using Emerson’s propriety algorithm, Short Run Install can provide 0.5% accuracy at zero diameters of pipe run without pressure loss or additional leak points. It helps users maintain accurate measurements despite short pipe runs, which are common in the often tight spaces in data centers, just as they are in many process facilities.

“This capability reduces design and installation risks because users know their system accuracy in a short-run design, and won’t need a specialty sensor for flexible installation and commissioning,” adds Chemler.

Rosemount 8795 can be paired with three types of compatible Rosemount magnetic flow transmitters, providing a base accuracy of 0.2% at ±2 mm/sec for hydronic applications over 5µS/cm conductivity. This magmeter trio includes 8732 that can be integrally mounted or remotely mounted, 8712 that’s wall-mounted with a 12-button interface, and 9732 that’s more advanced with multiple outputs and data logging capabilities. All transmitters have built-in diagnostics and verification capabilities that help users reduce commissioning risk and stay confident in their system performance.