SPEC Sensors NO2 110-507 installation guideline

Hello everybody, I work on a project that requires monitoring NO2. Our team chose the NO2 SPEC Sensors 110-507, I would like having more information on how to mount/assemble NO2 Sensor inside a plastic case for indoor application (for example: if it’s preferred vertical or horizontal mounting; or use of force ventilation or in free-air or others mechanical guidelines)
Francesco Niccolini


I can submit an inquiry to see what the manufacturer would have for that. It can take some time depending on if they have that information on hand or not.

@Nathan_2268 Thanks, let me know as soon as you have any news.

Hello @francesco.niccolini

Our Product Specialist replied that he contacted the manufacturer and he received this reply: “An application note is being created and will be available soon.”

As soon as we have that information, we will post it for you.

Hello Francesco.niccolini,
We did receive the following from our Product Specialist:

Interlink Electronics has a detailed set of Application Notes on our electrochemical gas sensors available online at https://www.spec-sensors.com/resource-library/.

Each application has unique requirements, Interlink would love to learn more about a customer’s specific needs so that we can better assist the customer.

Interlink offers a ready to use, off-the-shelf, reference design module (digital or analog) that supports the SPEC™ gas sensors and allows you to evaluate our gas sensors in your application.

General considerations:

  1. An electrochemical gas sensor uses air diffusion (free air) method to detect gas. Most electrochemical gas sensors are designed to operate in ambient air.
    If the application is within an HVAC system or engine exhaust system, additional considerations may be necessary. Please contact us for more information.
    Air diffusion method: sensor element face is parallel to any ambient air flow (max 1 liter per minute).
    NO2 datasheet https://www.spec-sensors.com/wp-content/uploads/2024/02/Nitrogen-Dioxide-Sensor-110507_110508_110509_1.pdf
  2. NO2 is a reactive gas, which can be challenging to measure as reactive gases may react with common materials, which reduces the gas ppm concentration reaching the gas sensor.
    Where possible, use PTFE (Teflon), polypropylene, or stainless steel. Delrin and polycarbonate are also suitable. ABS is not recommended.
    Use 3D-printed materials with caution as they may outgas solvents that effect the sensor response. Viton and EPDM are suitable materials for gaskets used near the sensor.
  3. Each application has unique requirements, we would love to learn more about your specific needs so that we can better assist you.

Example of specifics to consider for the detection of NO2 indoors:

  1. Early detection may depend on the height of the gas source and where the device is measuring ambient air.
  2. In general, hot gas rises but cools and sinks. NO2 is denser than air.
  3. Where building occupants are adults, consider average height where people breathe.
  4. Where children are present, consider low heights where children breathe.
  5. Air flow indoors will impact the above considerations.
  6. Air filters are used to remove pollutants. Consider before and after air filter to measure filter efficiency, an indicator when to replace the filter.