Rethinking Temperature Measurement in Liquid-Cooled Data Centers

Why Non-Invasive Sensors Like the iTHERM SurfaceLine TM611 Are Built for the Future of Hyperscale Cooling

As computing demands skyrocket due to AI and high-performance computing (HPC), hyperscale data centers are facing a thermal reality check: air cooling can’t keep up.

To handle the heat generated by modern GPUs and dense CPUs, data centers are shifting toward liquid cooling systems—which offer superior thermal efficiency and energy performance. But while these advanced systems promise powerful benefits, they also require equally advanced monitoring tools. And that’s where traditional temperature measurement methods fall short.

The Problem: Invasive Sensors Aren’t Built for Modern Cooling

In liquid cooling loops, temperature control is everything. Yet the industry has long relied on invasive thermowell-based sensors like RTDs and thermocouples. These sensors, which physically penetrate the process pipe, come with a host of challenges:

• Risk of leakage and contamination
• Flow disruption that strains pumps and increases energy use
• Complex installation requiring wake frequency calculations
• Maintenance downtime and sensor fouling

In a mission-critical environment where uptime, cleanliness, and efficiency are non-negotiable, these trade-offs are becoming unacceptable.

The Solution: iTHERM SurfaceLine TM611

The iTHERM SurfaceLine TM611 from Endress+Hauser offers a game-changing alternative: a non-invasive, clamp-on temperature sensor designed for data centers that demand precision without compromise.

What makes it different?

• Clamp-On Design: Attaches externally with zero process penetration
• Faster Response: Matches the performance of insertion-style sensors
• Clean Operation: No contact with fluid = no fouling, no contamination
• Reliable Readings: Superior thermal conductivity via mechanical interface
• Low Maintenance: No thermowells to replace, no pressure drops to manage

As shown in testing (see Figure B from the white paper), the TM611 delivers accurate, responsive thermal measurements—on par with traditional sensors—without the risks.

 

Learn More

Endress+Hauser’s white paper, Reducing Complexity in Data Center Cooling Temperature Measurements, explores the engineering and performance of the TM611 in greater depth. It’s a must-read for anyone serious about data center cooling.