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2. Thermopile - Wikipedia

   en.wikipedia.org/wiki/Thermopile

   The output of a thermopile is usually in the range of tens or hundreds of millivolts. [7] As well as increasing the signal level, the device may be used to provide spatial temperature averaging. [8] Thermopile, composed of multiple thermocouples in series. If both the right and left junctions are the same temperature, voltages cancel out to zero.

3. Air purifier - Wikipedia

   en.wikipedia.org/wiki/Air_purifier

   An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics , and at reducing or eliminating second-hand tobacco smoke .

4. Do Air Purifiers Actually Work? Here's What Experts Say - AOL

   www.aol.com/air-purifiers-actually-heres-experts...

   Air purifiers usually consist of a filter, or multiple filters, and a fan that sucks in and circulates air. As air moves through the filter, pollutants and particles are captured, and the clean ...

5. Air purge system - Wikipedia

   en.wikipedia.org/wiki/Air_purge_system

   An air purge heating unit is used to ensure that the purge air remains at a temperature above the acid dew-point. This temperature is typically around 20 °C/68 °F. [2] If temperatures are below this point, the controls will be corroded by condensation of compounds in the flue gas. Heated air ensures that controls are dry during startup. [3]

6. Are air purifiers really worth it? We asked the experts - AOL

   www.aol.com/lifestyle/are-air-purifiers-worth-it...

   Air quality has hit dangerous levels, and many experts recommend using air purifiers in our homes. Like many of you, we are curious about whether an at-home purifier is worth it and how it works ...

7. Thermopile laser sensor - Wikipedia

   en.wikipedia.org/wiki/Thermopile_laser_sensor

   Figure 2: [8] Working principle of a thermal laser sensor (Adapted from figure 3 with permission) As shown in Fig 2, a thermopile laser sensor consists of several thermocouples connected in series with one junction type (hot junction at temperature T 1) being exposed to an absorption area and the other junction type (cold junction at temperature T 2) being exposed to a heat sink.

8. The best air purifiers of 2025 - AOL

   www.aol.com/lifestyle/best-air-purifiers...

   One of tallest (nearly 24 inches) and heaviest (17.5 pounds) air purifiers tested, the Winix 5500-2 Air Purifier is ideal for small-to-medium rooms (up to 360 square feet), with a True HEPA filter ...

9. Thermostat - Wikipedia

   en.wikipedia.org/wiki/Thermostat

   As illustrated in the use of the thermostat above, all of the power for the control system is provided by a thermopile which is a combination of many stacked thermocouples, heated by the pilot light. The thermopile produces sufficient electrical power to drive a low-power gas valve, which under control of one or more thermostat switches, in ...