Instructions 1. Before using, observe whether the pointer of the meter points to zero. If there is any offset, gently adjust the mechanical adjustment screw of the meter to return the pointer to zero point. 2. Place the calibration switch in the off position. 3. Insert the measuring rod plug into the socket, the measuring rod is placed vertically upwards, the screw plug is pressed tight to seal the probe, the "correction switch" is placed at the full position, and the "full adjustment" knob is slowly adjusted to make the meter pointer In fullness position; 4. Set the "correction switch" to "zero position", and slowly adjust the "coarse adjustment" and "fine adjustment" two knobs so that the meter pointer points to the zero position. 5. After the above steps, gently pull the screw plug to expose the probe (the length can be selected as needed), and make the red dot on the probe face the wind direction. According to the meter reading, check the calibration curve. Detecting the measured wind speed; 6. After measuring a few points (about 10min), the above steps 3 and 4 must be repeated to standardize the current in the meter. 7. After the test, the "correction switch" should be placed in the off position. An anemometer that converts a flow rate signal into an electrical signal that also measures fluid temperature or density. The principle is that a thin wire (heating wire) that is heated by electricity is placed in the airflow, and the heat dissipation amount of the hot wire in the airflow is related to the flow velocity, and the heat dissipation causes the temperature of the hot wire to change, causing the resistance change, and the flow rate signal is converted into electric signal. It has two working modes: 1 constant current. The current through the hot wire remains unchanged. When the temperature changes, the heat line resistance changes, so the voltage at both ends changes, thereby measuring the flow rate; 2 thermostatic type. The temperature of the hot wire remains the same, such as maintaining 150 ° C, the flow rate can be measured according to the current applied. The thermostatic type is more widely used than the constant current type. The length of the hot wire is generally in the range of 0.5 to 2 mm, and the diameter is in the range of 1 to 10 μm. The material is platinum, tungsten or platinum-iridium alloy. If a thin metal film (thickness less than 0.1 micron) is used instead of the metal wire, it is a hot film anemometer, which functions similarly to the hot wire, but is mostly used to measure the liquid flow rate. In addition to the ordinary single line type, the hot line can also be a combined two-wire or three-wire type to measure the velocity component in all directions. The electric signal output from the hot line is amplified, compensated and digitized and input into the computer, which can improve the measurement accuracy, automatically complete the data post-processing process, and expand the speed measurement function, such as simultaneously completing the instantaneous value and the time average value, the combined speed and the sub-speed, and the turbulence. And measurements of other turbulence parameters. Compared with pitot tube, hot wire anemometer has small probe volume and small interference to flow field; fast response, can measure unsteady flow rate; can measure very low speed (such as as low as 0.3 m / s). maintain The wind speed meter belongs to the meter for safety protection and environmental monitoring, and is a mandatory verification measuring instrument prescribed by China's measurement law. In addition to the factory sales need to have the corresponding calibration report, it is also required to go to the National Air Conditioning Equipment Quality Supervision and Inspection Center or the China Academy of Building Research to build energy and energy every year according to the requirements of JJG (Construction) 0001-1992 "Hot Ball Anemometer Calibration Regulations". The environmental testing center performs regular calibration and adjusts all aspects of the instrument according to its legal calibration certificate to obtain the best working condition. In addition to maintaining the accuracy of daily data, the following points should be noted in routine maintenance: 1. It is forbidden to use an anemometer in a flammable gas environment. 2. It is forbidden to place the anemometer probe in a flammable gas. Failure to do so may result in fire or even explosion. 3. Please use the anemometer correctly according to the requirements of the instruction manual. Improper use can result in electric shock, fire, and damage to the sensor. 4. In use, if the anemometer emits an unusual smell, sound or smoke, or if liquid flows into the anemometer, shut down the battery immediately. Otherwise, there is a danger of electric shock, fire and damage to the anemometer. 5. Do not expose the probe and anemometer body to rain. Otherwise, there may be electric shock, fire and personal injury. 6. Do not touch the internal sensor part of the probe. 7. When the anemometer is not used for a long time, remove the internal battery. Otherwise, the battery may leak and the anemometer may be damaged. 8. Do not place the anemometer in a place subject to high temperatures, high humidity, excessive dust and direct sunlight. Failure to do so may result in damage to internal components or deterioration of anemometer performance. 9. Do not wipe the anemometer with volatile liquids. Otherwise, it may cause deformation and discoloration of the anemometer housing. When there is stain on the surface of the anemometer, use a soft fabric and a neutral detergent to wipe. 10. Do not drop or press the anemometer. Failure to do so will result in malfunction or damage to the anemometer. 11. Do not touch the sensor's sensor area while the anemometer is energized. Otherwise, it will affect the measurement results or cause damage to the internal circuit of the anemometer.
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May 20, 2023