Installing CO2 monitors correctly is vital for both DOSH 2026 compliance and the accuracy of your EECA 2024 energy strategy. If a sensor is placed incorrectly, it may provide "false spikes" that waste energy by over-ramping your fans, or "dead readings" that leave occupants in stagnant air.
At EKG M&E, we follow 34 years of mechanical expertise to ensure your monitoring network provides a true representation of your facility’s air health.
The most common mistake is installing sensors too high or too low. To meet DOSH 2026 and ASHRAE 62.1-2025 standards, sensors must be placed in the Breathing Zone:
Vertical Height: Between 0.9 meters and 1.8 meters (3 to 6 feet) from the floor. This captures the air actually inhaled by seated or standing occupants.
Horizontal Clearance: Maintain at least 1 meter of distance from occupants. Placing a monitor directly on a desk can cause "Exhale Spikes," where a single person’s breath triggers the ventilation system unnecessarily.
Before permanent installation, we recommend Ambient Air CO2 Mapping to find areas with the poorest circulation:
Stagnant Pockets: Install monitors in corners, behind partitions, or in deep meeting rooms where air movement is naturally lower.
Avoid Supply Vents: Never install a monitor directly under a fresh air supply vent. The sensor will read the "clean" incoming air rather than the "spent" air in the room, leading to under-ventilation.
Avoid Windows/Doors: Drafts from open doors or poorly sealed windows will dilute the $CO_2$ near the sensor, giving a false sense of security.
For your installation to contribute to your Building Energy Index (BEI), the monitors must communicate with your HVAC hardware:
Wall-Mounted Controllers: These should be hardwired to the Variable Frequency Drive (VFD) or the BMS (Building Management System) using protocols like BACnet or Modbus.
Duct-Mounted Sensors: These are installed in the Return Air Duct. While they provide a good "average" for a large zone, they should always be supplemented by wall sensors in high-density areas (like conference rooms).
The Cube Law in Action: Once installed, we tune the controller so that as levels drop, the VFD slows the fan. Reducing fan speed by 20% via this automated link can cut your ventilation power draw by nearly 50%.
Even the best sensor cannot fix a mechanical failure. During installation, we perform a system-wide check:
Vibration Isolation: We use Fast Fourier Transform (FFT) analysis to ensure the mounting surface is stable. High-frequency vibration from nearby machinery can interfere with the internal optics of CO2 sensors, leading to "Signal Jitter."
Air Velocity Check: We verify that air movement stays between 0.15 and 0.50 m/s at the sensor location. If the air is too fast or too slow, the sensor may not reflect the actual CO2 concentration of the room.
34 Years of Engineering Depth: We don't just "hang a box"; we integrate a complete air management strategy.
Audit-Ready Validation: We provide the Placement Maps and Calibration Certificates required for your 2026 DOSH IAQ File.
Energy ROI: We ensure your CO2 monitors are correctly "talking" to your VFDs to maximize your EECA energy credits.
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