Sitewalk & Evaluation
ESC Spectrum’s CEMS Sitewalk and Evaluation process helps operators in various industries assess the condition of CEMS-equipped plants and facilities. During this process, our expert technicians inspect the safety and condition of the facility’s CEMS equipment, including probes, sample lines, shelters, and more, to identify potential problems. Based on our findings, we will present our recommendations based on your specific needs and budget requirements.
Four-Step CEMS Sitewalk and
Evaluation Process
Our team of technicians has over five decades of experience in
CEMS and is well-known for high-quality work. ESC Spectrum’s four-step CEMS Sitewalk and Evaluation process helps you
identify problems before they become critical.
- Step 1: Sitewalk of your CEM systems to determine the health of the components
- Step 2: Assessment with a detailed description of our recommendations, including the replacement of components
- Step 3: Source CEMS components needed to perform repairs and upgrades
- Step 4: Professional installation by our seasoned technicians
From The Source Blog

Air Emissions Calibration Testing: Staying Compliant With Daily and Quarterly Requirements
Accurate air emissions calibration testing is essential for maintaining compliance and ensuring reliable CEMS performance. This blog breaks down daily and quarterly calibration test requirements, explains how offline calibrations are used, and clarifies what causes out-of-control data.

Alliance Technical Group Acquires ESC Spectrum, Cementing Global Leadership in Continuous Emissions Monitoring (CEMS) and Data Acquisition Systems (DAS)
ESC Spectrum is now part of Alliance Technical Group, combining forces to deliver the most comprehensive CEMS and DAS compliance platform in the industry. This strategic acquisition strengthens our ability to serve customers with expanded resources, nationwide support, and end-to-end environmental solutions.

CEMS Probe Maintenance: Extractive vs. Dilution Systems
CEMS probes are the first point of contact with the gas sample line in your emissions monitoring system. Discover why routine maintenance is critical—and how to do it right.