Commonly used instruments for measuring wind speed include a cup anemometer, a wing anemometer, a catastat thermometer and a hot ball anemometer. The wing and cup anemometers are easy to use, but have a high inertia and mechanical friction resistance and are only suitable for measuring large wind speeds.
1. The construction principle is an instrument capable of measuring low wind speed, and its measurement range is 0.05-10 m/s. It consists of two parts: a hot ball type probe and a measuring instrument. The probe has a glass ball of 0.6 mm in diameter surrounded by a nickel-chromium wire loop for heating the glass ball and two thermocouples connected in series. The cold end of the thermocouple is attached to the phosphor bronze pillar and is directly exposed to the gas stream. When a certain amount of current passes through the heating coil, the temperature of the glass sphere rises. The degree of elevation is related to the wind speed, and the degree of increase in wind speed is large; on the contrary, the degree of increase is small. The degree of elevation is indicated on the meter by a thermocouple. According to the reading of the meter, check the calibration curve to find out the wind speed (m/s).
2. Usage 1 Before use, observe whether the pointer of the meter refers to zero point. If there is offset, you can gently adjust the mechanical adjustment screw of the meter to return the pointer to zero point; 2 put the calibration switch in the off position; 3 will measure The rod plug is inserted into the socket, the measuring rod is placed vertically upward, the screw plug is pressed to seal the probe, the “correction switch†is placed at the full position, and the “full-scale adjustment†knob is slowly adjusted, so that the meter pointer is at the full position. 4 Set the “correction switch†to “zero positionâ€, and slowly adjust the “coarse adjustment†and “fine adjustment†two knobs to make the meter pointer point at the zero point; 5 after the above steps, gently pull the screw Plug, expose the probe (length can be selected according to needs), and make the red point on the probe face the wind direction, according to the meter reading, check the calibration curve, you can find the measured wind speed; 6 in the determination of several points After (about 10min), the above steps 3 and 4 must be repeated to standardize the current in the meter. 7 After the measurement, the “correction switch†should be placed in the off position.
3. Precautions 1 This instrument is a relatively precise instrument, which is strictly resistant to collision and vibration. It should not be used in places with excessive dust or corrosiveness. 2 The instrument is equipped with 4 batteries, which are divided into two groups and are connected in three sections, one set is single section. When adjusting the “Full Degree Adjustment†knob, if the meter cannot reach full scale, it means that the single battery has been exhausted; when adjusting the “coarse adjustment†and “fine adjustment†knob, if the meter pointer cannot return to zero, the explanation The three batteries have been exhausted; when replacing the battery, open the small door at the bottom of the instrument and connect it in the correct direction. 3 After the instrument is repaired, it must be recalibrated.
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