CEMS Services
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ESC Spectrum has performed a variety of CEMS maintenance, repair, and testing services since its founding in 1981 by a field technician. We were the first company to certify a CEMS in accordance with Part 75 regulations and began stack testing and building shelters in 1991.
After decades of experience, we’ve seen it all: our team of experts is well-versed in solving unique challenges. We understand EPA test methodologies, repair analyzers, umbilical systems, and other CEMS equipment and have a deep knowledge of CEMS operations.

Michael is always very professional and knowledgeable.
I am always confident things will be resolved quickly with him.
Dave Patterson
Consulting Engineer (Air Quality Group), Ameren
ESC Spectrum has provided excellent engineering and procurement support.
Juan Cantu
Analyzer Specialist, ENglobal
Alex was very helpful in resolving the issues that I brought to him.
Kevin Bugay
Process Engineer, Cardinal Corporation
Even though we are only data logger users, the support staff has always been extremely nice,
very timely and completely knowledgeable on the topic at hand.
John Markely
Sr. Environmental Engineer, Kyger Creek
Very helpful, understood my issue and found the fix I needed.
Dane Ruberg
Instrument Technician, Xcel Energy
Scott is fantastic, very knowledgeable and very helpful!
Always know I am going to get the help I need when he answers the phone.
Celena Arreola
Environmental Engineer, El Paso Electric
Outstanding customer service!!!
Rick Gregory
IT Specialist/Network Admin, Calumet Specialty Partners
The customer service provided was quick and the agent sent additional information.
Ann Woods
Environmental Scientist, Agua Fria Generating Station
Excellent work!
Daniel Fefer
Contractor, Exelon
From The Source Blog

ESC Spectrum Launches Interim Reporting Services to Support Facilities with Temporary Reporting & Regulatory Help
ESC Spectrum is excited to introduce Interim Reporting Services, designed to help facilities maintain compliance during short-term staffing challenges. Our expert team provides support with data review, permit compliance, QA/QC management, and more—ensuring critical reporting obligations are met accurately and on time.

Minimizing CEMS Downtime: Maintenance & Upgrade Strategies
CEMS downtime can lead to compliance risks and operational inefficiencies. This guide covers essential strategies for maintaining hardware, upgrading systems, and managing spare parts to minimize disruptions. Field Service Technician V and SME John Cutaia shares how to keep your Continuous Emissions Monitoring System (CEMS) operating efficiently with proactive maintenance and timely upgrades.

Maximizing ROI: Upgrading Your Data Acquisition System
Upgrading your Data Acquisition System (DAS) isn’t just about staying current—it’s about improving efficiency, ensuring compliance, and reducing costs. Whether you’re facing outdated technology, new regulations, or inefficiencies, the right DAS can streamline operations and enhance data visibility. Learn the key signs that it’s time for an upgrade and how a modern system can maximize your ROI.