AIR HUMIDITY SENSOR Russian patent published in 2023 - IPC G01N27/02 

FIELD: measurement instrumentation.

SUBSTANCE: devices for monitoring humidity in domestic and industrial premises. The humidity sensor contains a moisture-absorbing layer in the form of a block of citrogypsum composite (CaSO₄⋅2H₂O)0.975-(CuSO₄⋅5H₂O)0.025, conductive plates with a thickness of no more than 0.5 mm, connected in a series electrical circuit with a current source and a measuring device, as well as a dielectric layer placed on the lower and upper conductive plates, two thermocouples connected to the measuring device, placed on the top and lower dielectric layers, respectively, a Peltier element placed under the lower dielectric layer. In this case, the measuring device and the current source are located in an electronic control unit, which also contains a communication unit with an external device and/or a display, a Peltier element control unit in the form of a programmable chip equipped with RAM, which includes a memory module for storing the calibration temperature and the impedance value at calibration temperature, as well as a module for comparing the measured impedance with the sensor impedance for the corresponding humidity and calibration temperature.

EFFECT: improved reliability of the sensor and reliability of the measurement results by providing automatic calibration of the sensor simultaneously with the measurements; in addition, it provides the ability to carry out measurements in both continuous and discrete modes.

1 cl, 2 dwg, 2 ex