SENSORS & SENSING SYSTEMS u ANALOG DEVICES
Figure 3: Performance of the ethanol sensor
Figure 4: Current consumption at various power supply voltages and over the operating temperature range
in Figure 5. As expected, the amplitude of the vapour concentration blue curve was reduced accordingly. Unlike ethanol, CO is a potentially poisonous
gas resulting from the incomplete combustion processes from gasoline or even a harmless candle. So, it’s important that proper ventilation be implemented to ensure health and safety when conducting this CO gas experiment. In this evaluation, a candle was used to produce the CO gas in a concealed jar, and the same sensor SPEC 3SP_ Ethanol_1000 Package 110-202 was used to capture the CO gas concentration. Figure 6 portrays the capture of the CO gas
as shown in the blue curve. The green curve is the current consumption of the entire system including the microcontroller, which is typical 90mA.
As in the ethanol evaluation, when in idle
mode, the microcontroller wakes up every 10 seconds to monitor the CO gas. When the gas is detected, the microcontroller starts measuring its concentration as shown in the blue curve. The red line shows the AA battery voltage of approximately 1.5V, and the yellow line is the CE voltage.
CONCLUSION The MAX40108 device is specifically designed to capture and measure the commonly encountered gases such as ethanol and CO effectively as it possesses not only a low current consumption of 25.5µA but also a tiny dimension of 1.22mm × 0.92mm in the 8-ball WLP package. The amplifier features a shutdown mode for
saving power further, which is imperative for wearable devices, portable medical systems, and industrial internet of things (IIoT) such as pressure, flow, level, temperature, and proximity measurements.
18 February 2024 Irish Manufacturing Figure 5: Performance of the ethanol sensor as vapour was moved far away from the SPEC sensor
Figure 6: Performance of the MAX40108 CO sensor
www.irish-manufacturing.com
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