Emerson Rosemount 8795: data centre flow sensor

Contents

0.5% accuracy at 0D in short, tight runs
Optimised for chilled water and water-glycol loops
Standardising on one solution across the facility

Emerson has introduced the Rosemount 8795 magnetic flow sensor, designed specifically for hydronic cooling applications in data centres. The industrial-grade sensor can measure with 0.5% accuracy even in tight installations where the straight pipe run is reduced to zero diameters (0D).

According to Emerson’s announcement from Shakopee, Minnesota on 13 October 2026, the Rosemount 8795 was developed to provide accurate and repeatable flow measurement in mission-critical data centre cooling loops. Because the sensor is designed to meet common technical requirements in data centre environments, it also simplifies product selection, installation and commissioning.

0.5% accuracy at 0D in short, tight runs

The sensor is supported by Emerson’s proprietary Short Run Installation software, developed for short and tight pipe installations. This maintains measurement accuracy in data centre installations where space is limited and straight pipe requirements cannot be met. Depending on the upstream disturbance and its distance to the electrodes, 0.5% accuracy can be achieved even with 0D of straight pipe.

Emerson describes this capability as an industry first, noting that other magnetic flowmeters need a specially designed multi-electrode sensor or a reduced bore to reach this result.

In applications with 5D/2D or more of straight pipe upstream and downstream, the sensor can measure with 0.2% ± 2 mm/s accuracy when paired with any compatible Rosemount transmitter. Diagnostic and verification functions in all compatible Rosemount transmitters reduce the risk of errors during commissioning and also allow subsequent system performance to be monitored.

Optimised for chilled water and water-glycol loops

The Rosemount 8795 is optimised for chilled water and water-glycol cooling loops and delivers consistent performance across the 2 to 18 inch line sizes commonly used in data centres. With 0.1% repeatability, the sensor feeds data to building management systems (BMS) and data centre infrastructure management (DCIM) systems for water usage effectiveness (WUE), cooling usage effectiveness (CUE) and power usage effectiveness (PUE) calculations.

The sensor uses a polytetrafluoroethylene (PTFE) liner and stainless steel electrodes. Emerson says these materials were chosen for thermal management applications in primary cooling loops and for closed-loop cooling systems.

Standardising on one solution across the facility

Designed to meet common BMS cooling specifications, the sensor’s main features include:

Design with no moving parts
Minimum conductivity of 5 µS/cm for precise measurement
Dual 4-20 mA and Modbus output
Universal power supply for AC or DC
Integral or remote-mount transmitter options
Short Run Installation software

According to Emerson, these features allow all hydronic requirements in a data centre to be standardised around a single solution. The company also says its global supply chain helps shorten lead times at the scale data centres require.

Bob Halgren, vice president responsible for magnetic and vortex flow products in Emerson’s Measurement Instrumentation business, said that as data centres expand to meet growing demand for digital infrastructure, the Rosemount 8795 draws on Emerson’s decades of flow measurement expertise to help operators improve reliability, simplify installation and maximise cooling system performance in mission-critical applications.

With advanced software capabilities and a simplified ordering process, the Rosemount 8795 joins Emerson’s existing magnetic flowmeter portfolio.

Sources

Emerson press release on its new flow measurement solution for data centre reliability, efficiency and uptime, Shakopee, Minnesota, 13 October 2026 (via HHC Lewis; Ref: 504754).

Image: Emerson – Rosemount 8795 magnetic flow sensor and Rosemount 9732 magnetic flow transmitter