ZMOD4510AI4 datasheet(9/23 Pages) RENESAS

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ZMOD4510 Datasheet

June 30, 2021

5. Gas Sensor Module Characteristics

The ZMOD architecture leverages different “Methods of Operation” which use time, temperature, and signatures from gases that enable unique

signals from a highly trained machine learning system and makes use of embedded artificial intelligence (AI) technology. This section discusses

the different operation modes of the ZMOD4510. Currently, two operation modes are released using the same ZMOD4510 hardware:

Family of Outdoor Air Quality (OAQ) software releases:



Operation Mode 1 – OAQ 1st Generation: Measurement of Air Quality



Operation Mode 2 – OAQ 2nd Generation: Selective Ozone featuring Ultra-Low Power

In addition, details for sensitivity, reliability, sample rates, and sensor module influences are explained in detail in the following sections. All

graphs and information show the typical responses that are to be expected from the sensor module upon exposure to a variety of test conditions.

For more information, including application notes, white papers, blog, and manuals, visit the ZMOD4510 product page.

5.1 Air Quality Standard

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

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

operation mode, the ZMOD4510 Gas Sensor Module can detect the presence of elevated ozone (O3) and nitrogen dioxide (NO2) levels or

selectively ozone levels as described by the EPA. 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 EPAii

Air Quality Index (AQI)

Level of Concern and Air

Quality Condition

O3 Concentration

1h average [ppb][a]

O3 Concentration

8h average [ppb]

NO2 Concentration

1h average [ppb]

Color Code

0 to 50

Good

0 to 62

0 to 54

0 to 53

Green

51 to 100

Moderate

63 to 124

55 to 70

54 to 100

Yellow

101 to 150

Unhealthy for Sensitive Groups

125 to 164

71 to 85

101 to 360

Orange

151 to 200

Unhealthy

165 to 204

86 to 105

361 to 649

Red

201 to 300

Very unhealthy

205 to 404

106 to 200

650 to 1249

Purple

301 to 500

Hazardous

405 to 604

1250 to 2049

Maroon

[a] For OAQ 1st Gen ozone is always 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.

5.2 Operation Mode 1: OAQ 1st Generation

This mode of operation allows a general measurement of Air Quality, including non-selective measurement of nitrogen dioxide (NO2) and ozone

(O3). With a sample rate of 60 seconds each concentration is considered from a 1-hour class; however, in case the 1-hour value is not available

by the EPA (“Good” and “Moderate” levels) a linear approach was assumed to calculate the AQI value. AQI values above 500 are considered

beyond the AQI. The reported AQI from the ZMOD4510 sensor is derived from the calculated NO2 and O3 concentration present.

AirNow, US Environmental Protection Agency, Air Quality Index (AQI) Basics; available at: https://airnow.gov/index.cfm?action=aqibasics.aqi

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