DEVICE FOR MEASURING AIR HUMIDITY Russian patent published in 2002 - IPC

FIELD: measurement instruments. SUBSTANCE: device has humidity sensor of capacity type, unit for measuring output voltage level, functional unit for adjusting unit readings with air temperature taken into account. Coordinating voltage transformer unit is additionally used. Its primary winding is connected in series with the sensor of capacity type. Signal line of required length having wave resistance equal to ρ, is attached to the secondary winding which outlet clamps are connected to variable voltage amplifier. Complex resistance of the primary transformer winding is not to exceed 0.5-1.0% of complex resistance of sensor of capacity type. EFFECT: enhanced accuracy of measurements with sensors being 100-200 m far from each other. 2 cl, 1 dwg