Table 1 Sensor specifications and experimental parameters used in the study.

From: Enhanced Selectivity Electronic Nose Systems for Agricultural Ammonia Gas Detection via a co-designed WO3-ZnO Sensor Array and Convolutional Neural Networks

Sensor type

Model/configuration

Target gases

Operating temperature range tested (°C)

Manufacturer/configuration

Metal oxide

Grove Multi-Gas V2 (GM-102B)

CO, CO2, NH3, CH4

150–350

Seeed Studio

Metal oxide

Grove Multi-Gas V2 (GM-302B)

CO, Alcohols, NH3

150–350

Seeed Studio

Metal oxide

Grove Multi-Gas V2 (GM-502B)

H2, CH4, CO

150–350

Seeed Studio

Metal oxide

Grove Multi-Gas V2 (GM-702B)

H2S, NH3, CO

150–350

Seeed Studio

Metal oxide

MQ135

NH3, NOₓ, CO2

150–300

Hanwei Electronics

Metal oxide

MQ137

NH3

150–300

Hanwei Electronics

Metal oxide

TGS2602

NH3, H2S

150–300

Figaro Engineering

Environmental

BME688

Temperature, Humidity

− 40 to + 85

Bosch Sensortec

  1. Note: All metal oxide sensors were operated within their manufacturer-specified temperature ranges, with specific operating temperatures optimized for NH3 detection.
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