ZMOD4510 Datasheet

© 2020 Renesas Electronics Corporation

8

February 7, 2020

8. Gas Sensor Module Characteristics

Additional information about sensitivity and sensor influences are explained in detail in the following sections. All graphs and information show

the typical responses that are to be expected from the ZMOD4510 Gas Sensor Module upon exposure to a variety of test conditions. For

8.1 Typical Gas Stimulation

The algorithm provided by Renesas for the user’s microprocessor uses the output from the ZMOD4510 to determine the relative level of outdoor

gases present (see Renesas’ ZMOD4510 Programming Manual – Read Me; see section 12). The algorithm features an automated baseline

correction function, ensuring that the module can learn from its environment and distinguish elevated levels of outdoor gases under all

conditions. The proprietary metal oxide (MOx) used in the sensor ensures that the sensor module can respond effectively to changing Ozone

and Nitrogen Oxide levels during long-term operation.

There are many sources of poor outdoor air that can elevate the Air Quality Index (AQI). Renesas has adopted the definition of Outdoor Air

Quality and its impact on user health and comfort proposed by the US Environmental Protection Agency (EPA); see Table 6*. The ZMOD4510

concentration is considered from a 1-hour class; however, in case the 1-hour value is not available a linear approach was assumed to calculate

the AQI value. AQI values above 500 are considered beyond the AQI.

Additional information on this topic, chemical background information, and measurement technologies is available in Renesas’ ZMOD4510

White Paper – Overview Outdoor Air Quality.

Table 6.

Air Quality Index Levels Described by the EPA*

0 to 50

Good

0 to 53

0 to 62

Green

51 to 100

Moderate

54 to 100

63 to 124

Yellow

101 to 150

Unhealthy for Sensitive Groups

101 to 360

125 to 164

Orange

151 to 200

Unhealthy

361 to 649

165 to 204

Red

201 to 300

Very unhealthy

650 to 1249

205 to 404

Purple

301 to 500

Hazardous

1250 to 2050

405 to 604

Maroon

*

AirNow, United States Environmental Protection Agency, Office of Air Quality Planning and Standards (OAQPS), 2019