Carbon Monoxide (CO) Testing for CARB Compliance

At REM, our source testing protocols for CARB compliance include precise measurement and analysis of carbon monoxide (CO), a key indicator of combustion efficiency and air quality impact. CO is a colorless, odorless gas produced by incomplete combustion, and its accurate quantification is critical for both regulatory compliance and operational diagnostics.

How REM Tests for CO

REM follows U.S. EPA Reference Method 10 (RM 10), the industry-standard procedure for measuring carbon monoxide emissions from stationary sources. This method utilizes non-dispersive infrared (NDIR) gas analyzers, which are specifically designed to detect CO concentrations with high sensitivity and stability.

Sampling Process
We extract a representative gas sample directly from the exhaust stack or duct using a heated probe and sample line. Maintaining temperature control is essential to prevent condensation or loss of sample integrity. The sample is then transported to the analyzer in real time.

Measurement Technology
The NDIR analyzer works by passing infrared light through the gas sample. CO molecules absorb infrared energy at a specific wavelength, and the analyzer quantifies this absorption to determine concentration levels. This method provides continuous, real-time readings, allowing us to capture fluctuations in emissions during the test period.

Calibration and Quality Control
Accuracy is maintained through a rigorous calibration protocol:

• Zero and span calibrations are performed before and after each test run using certified calibration gases.

• Calibration drift checks ensure that analyzer performance remains within EPA-defined tolerances.

• All equipment is routinely maintained and verified to meet CARB and EPA standards.

Data Collection and Reporting
CO concentrations are recorded continuously throughout the test run. We correlate these readings with stack flow rates, temperature, moisture content, and oxygen levels (when required) to calculate emissions in standard units such as:

• Parts per million (ppm)

• Pounds per hour (lb/hr)

• Pounds per million BTU (lb/MMBtu), depending on regulatory requirements

Why CO Testing Matters

Beyond compliance, CO measurement provides insight into combustion performance. Elevated CO levels often indicate incomplete combustion, which can signal inefficiencies, fuel-air imbalance, or equipment issues. By identifying these conditions, REM helps clients not only meet CARB standards but also optimize system performance and reduce operational risk.

What Clients Can Expect

• Certified, EPA-compliant testing procedures

• Real-time, high-accuracy CO measurement

• Transparent data validation and reporting

• Actionable insights tied to system performance