Each time we initiate a new EM monitoring project, we face a familiar challenge: How do we optimize the layout of temperature and humidity sensors?

Installing too many sensors increases costs and generates unnecessary data, while too few sensors undermine the core purpose of EM monitoring—mitigating equipment disruptions, ensuring compliance with Service Level Agreements (SLAs), and conserving energy.

So, where is the sweet spot between too many and too few sensors? Over the years, we’ve developed a three-step process to optimize sensor layout for our clients:

Step 1: Start With Client Needs and Constraints

We begin by studying the client’s requirements, SLAs, and rack layout. We also consider physical obstructions like walls, cabinets and pillars, and RF interference—all of which can degrade the signals. Additionally, we pay attention to metal structures—poles, fences, and cages—that can interfere with signal transmission.

Step 2: Consider ASHRAE Guidelines

Next, we reference the latest ASHRAE guidelines for sensor placement, which include:

• Measuring cold aisles with sensors centered between the racks.
• Placing one temperature sensor for every 10-30 feet of aisle or every fourth rack position.
• Positioning sensors at three levels along the rack height: Bottom, middle, and top.

Step 3: Develop and Review the Proposed Layout

We integrate the client’s requirements, constraints, and ASHRAE guidelines to develop the most optimized layout tailored to the client’s needs.

Finally, we review the proposed layout with the client, explaining our rationale and inviting their input. Once the client approves the layout, we proceed with deployment.

Though our process may seem elaborate, it ensures something valuable—peace of mind that comes when you commit to following the best practices.

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