CO2 sensors must be tested and calibrated at least once every five years, or per the manufacturer’s recommendation, whichever timeframe is shorter. The sensors must have an accuracy of no less than 75 parts per million (ppm) or 5% of the reading, whicheve

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CO2 sensors must be tested and calibrated at least once every five years, or per the manufacturer’s recommendation, whichever timeframe is shorter. The sensors must have an accuracy of no less than 75 parts per million (ppm) or 5% of the reading, whichever is greater.

Having CO2 monitoring implemented at a systems level is not uncommon; however, this does not meet the requirements to specifically have CO2-monitoring devices in each densely occupied space. Also note that CO2 sensors within ducts don’t contribute to meet

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Having CO2 monitoring implemented at a systems level is not uncommon; however, this does not meet the requirements to specifically have CO2-monitoring devices in each densely occupied space. Also note that CO2 sensors within ducts don’t contribute to meeting this requirement.

Install at least one CO2 sensor within each densely occupied space. CO2 sensors must be located within the breathing zone, which is 3–6 feet above the floor.

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Install at least one CO2 sensor within each densely occupied space. CO2 sensors must be located within the breathing zone, which is 3–6 feet above the floor.

Determine whether you need to follow Case 2 in addition to Case 1. Case 2 applies to buildings with densely occupied spaces—defined as spaces designed for 25 or more people per 1,000 ft2 (40 ft2 or less per person). However, if these spaces add up to less

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Determine whether you need to follow Case 2 in addition to Case 1. Case 2 applies to buildings with densely occupied spaces—defined as spaces designed for 25 or more people per 1,000 ft2 (40 ft2 or less per person). However, if these spaces add up to less than 5% of your total occupied square footage, you’re exempt from the Case 2 requirements. Rooms smaller than 150 ft2 are also exempt and should not be included in your calculations.

Costs will vary depending on the level of existing monitoring in your building and the number of measurement devices that need to be installed. If you’re already using a BAS, costs will be limited to the parts and labor associated with installing the sens

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Costs will vary depending on the level of existing monitoring in your building and the number of measurement devices that need to be installed. If you’re already using a BAS, costs will be limited to the parts and labor associated with installing the sensors. If not, costs may be more significant.

In practice, it is generally not appropriate to use CO2 sensors to monitor indoor air quality in buildings without densely occupied spaces, since the sensors are designed for optimal use in those types of spaces.  CO2 sensors are not substitutes for

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In practice, it is generally not appropriate to use CO2 sensors to monitor indoor air quality in buildings without densely occupied spaces, since the sensors are designed for optimal use in those types of spaces.  CO2 sensors are not substitutes for required equipment used to continuously monitor outdoor airflow rates, but rather are supplementary monitors that can be useful in buildings containing densely occupied spaces (see Case 2 below).

Measurement devices must be monitored by a control system, such as a BAS, that will record the outdoor airflow data at intervals of 15 minutes or less and generate trending graphs or tables so that building managers can analyze airflow levels over time.

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Measurement devices must be monitored by a control system, such as a BAS, that will record the outdoor airflow data at intervals of 15 minutes or less and generate trending graphs or tables so that building managers can analyze airflow levels over time.

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