Anemometer work mode has several: anemometer velocity signal into electrical signal a speed measuring instrument, also can measure fluid temperature or density. Its principle is that the thin wire of a electric heat ( Said) Put in air, heat dissipating capacity is related to flow velocity in the air, and temperature change caused by the resistance resulting from heat dissipating capacity of the velocity signal is transformed into electrical signals. There are two work modes: (1) the constant flow. Through current remain unchanged, the temperature changes, the resistance to change, and both ends of the voltage changes, the measured velocity; (2) the thermostat. Temperature remains the same, such as 150 ℃, applying current can be measured according to the required flow rate. Thermostat than constant flow application more widely. In addition to the ordinary single type, also can be a combination of double wire or 3 line, used to measure velocity component in all directions. From the output of the electrical signal, after amplification, compensation, and digital input computer, can improve the accuracy of measurement, automatic data processing process, expanding speed function, such as the completion of instantaneous value and at the same time average, speed and velocity, turbulence and other turbulence parameters measurement.