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For models with humidity, a capacitive humidity sensing element changes capacitance as a function of the relative humidity. An electronic measuring circuit converts the humidity signal to a continuous 0 to 10 Vdc signal that corresponds to a relative humidity range of 0 to 100%. For models with temperature, the sensor acquires room temperature with a sensing element that changes electrical resistance as a function of the temperature. The resistance is converted to an active 0 to 10 Vdc output signal that corresponds to a temperature range of 32°F to 122°F (0°C to 50°C) or -31°F to 95°F (−35°C to 35°C).
Sensors with an LCD window display the following measured values:
• CO2 in ppm
• CO2 and VOC as a bar chart (4 bars ≈ 2V, 20 bars ≈ 10V)
• Temperature in °C or °F
• Relative humidity in %
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