ANTIFREEZING AGENT CONCENTRATION DETECTOR

PROBLEM TO BE SOLVED: To spray a proper quantity of an antifreezing agent by directly burying and installing concentration detecting electrodes on a road or a parking lot, sticking the thinned antifreezing agent between the electrodes, and detecting concentration on a real-time basis. SOLUTION: When an antifreezing agent is sprayed on a road surface, the antifreezing agent is stuck to an antifreezing agent concentration detector buried on the road surface. The antifreezing agent is thinned in concentration by the moisture existing on the road surface in advance or the snow ice by fallen snow, and the solution with thin concentration is stuck to the antifreezing agent concentration detector. A resin material or a concrete material 1 protects the periphery of the detector. Electrodes 2 detect concentration, a circuit 3 converts the concentration into an electric signal, and the electric conductivity between the electrodes 2 is detected. The relation ship between the antifreezing agent and the electric conductivity varies according to the kind of the antifreezing agent, and the constant of an amplifier in the circuit 3 can be changed. A heater 4 keeps the detector at a constant temperature. The concentration of the antifreezing agent sprayed on the road surface can be invariably detected, and a proper quantity of the antifreezing agent can be sprayed.