Pitot anemometer is one of the velocity signal into electrical signal speed measuring instrument

by:HoldPeak     2020-06-09
Pitot anemometer using method: 1, observe whether electric meter pointer refers to zero before use, if any deviation, mechanical adjustment screws can be gently adjusted the meters, return pointer to zero; 2, put calibration switch at the location of the broken; 3, the rod plug in the socket, rod vertical placed, plug pressure probe seal, calibration switch in full position, slowly adjust the full adjustment knobs, make the electric meter pointer refers to the full; 4, put calibration switch at zero, slowly adjust the coarse and fine tuning two knobs, make the electric meter pointer refers to the zero position; 5, after the above steps, gently pull the plug, the rod probe show ( The length can be according to the need to choose) And the probe on the red dot face toward the direction of the wind, according to the degree of meter reading, consult the calibration curve, can be found to be measured wind speed; 6, after the determination of a number of points ( About 10 min) , must repeat the above steps 3 and 4, make the current inside the instrument is standardized; 7, measurement, correction should be switch in the off position. Pitot anemometer is one of the velocity signal into electrical signal 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. Length is in commonly 0. 5 ~ 2 mm range, range from 1 to 10 microns in diameter, material for platinum, tungsten and platinum rhodium. If a piece of very thin ( The thickness is less than 0. 1 micron) Metal film instead of metal wire, is the hot film pitot anemometer, function similar to hot wire, but more for measuring the liquid flow rate. 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. Pitot anemometer, compared with pitot probe is small in size, little interference flow field; Fast response, to measure the unsteady flow speed; To measure very low speed ( Such as low as zero. 3 m/s) Wait for an advantage.
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