Key Differences Between CEMS and PEMS

The government requires industrial facilities that produce gas emissions to comply with regulations to ensure the safety of their workers. It’s also one way to keep environmental health hazards in check. Current technology has made this possible. It’s only up to business owners and managers to pick a system they prefer. Continue reading to learn about these options and their differences.

What Is a Continuous Emission Monitoring System?

CEMS is a tool that monitors oxygen, carbon monoxide, and carbon dioxide. It measures the physical and chemical attributes of gases directly. In an industrial setting, this device provides information that allows for efficient combustion control. This technology enables businesses to follow the standards set by the Environmental Protection Agency (EPA) by continuously collecting, recording, and reporting data for compliance.

What Is a Predictive Emission Monitoring System?

PEMS works similarly to Cesspit just collects information through different means. It uses virtual sensors and empirical mathematical models to predict the values of gases that are difficult to measure. It utilizes the sample data gathered by CEMS to forecast emission levels.

What Are the Key Differences Between the 2?

Both CEMS and PEMS are used to monitor gas emissions and predict any imbalances. This allows plant managers to modify operation protocols and make sure that their facility is EPA compliant at all times. Although they share the same goal, there are slight dissimilarities between them. These characteristics are discussed further below:

Capital Cost

Because PEMS only uses data already collected by CEMS, the initial cost of acquiring one is much lower. Sometimes, the price is half what you’d spend on a brand new COorNOx CEMS.

Installation Time

CEMS has electrical, mechanical, and electronic components that take a while to install. Completion is around 3-4 months. Meanwhile, PEMS just needs 1 computer with all the necessary software to function. This makes a single-day installation possible. Note, though, that a PEMS must have data from an operational CEMS to work.


PEMS only needs seasonal cleaning of the computer used to process data. CEMS has electrical and mechanical parts that require the service of a complete maintenance team.

Calibration Gases

PEMS works with data. It doesn’t need to calibrate the gas where the information is derived from. CEMS has cylinders filled with sample emissions that require careful storage and documentation.

Data Availability

When 1 component of CEMS fails, the system is considered down. With PEMS, a robust database should be more than enough for it to continue calculating and predicting any excess emissions.

Which Is Better?

These tools are crucial aspects of industrial plant monitoring. They have advantages and disadvantages over each other. Having both of them installed in your facility will allow you to reap the complete benefits. This way, you guarantee that you have all the data you need, and there’ll be no down times in your operations.

There are plenty of NOx and CO CEMS suppliers that could service your facility. Just make sure they provide EPA-compliant systems for your facility’s security. This will allow your business to conform to federal regulations and do its share in minimizing negative environmental impact.

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