Anemometers belong to safety protection and environmental monitoring measuring instruments, and are mandatory verification measuring instruments stipulated by my country's Metrology Law. In addition to the corresponding calibration report required for factory sales, it is also required to go to the National Air-Conditioning Equipment Quality Supervision and Inspection Center or China Academy of Building Research Building Energy and Energy and Energy and Environmental Engineering every year in accordance with the requirements of JJG (Construction) 0001-1992 "Thermal Ball Anemometer Verification Regulations". The environmental testing center performs regular calibration and adjusts all aspects of the instrument to obtain the best working condition according to the legal calibration certificate issued by it.
In addition to maintaining the accuracy of daily data, the following points should be paid attention to in daily maintenance and use:
1. It is forbidden to use the anemometer in a flammable gas environment.
2. It is forbidden to put the anemometer probe in flammable gas. Otherwise, fire or explosion may result.
3. Please use the anemometer correctly according to the requirements of the instruction manual. Improper use may result in electric shock, fire and sensor damage.
4. During use, if the anemometer emits abnormal smell, sound or smoke, or liquid flows into the anemometer, please turn off the device immediately and remove the battery. Otherwise, there is a risk of electric shock, fire, and damage to the anemometer.
5. Do not expose the probe and the anemometer body to rain. Otherwise, there may be a risk of electric shock, fire, and personal injury.
6. Do not touch the sensor part inside the probe.
7. When the anemometer is not used for a long time, please remove the internal battery. Otherwise, the battery may leak, resulting in damage to the anemometer.
8. Do not place the anemometer in a place with high temperature, high humidity, dust and direct sunlight. Otherwise, damage to the internal components or deterioration of the anemometer performance will result.
9. Do not wipe the anemometer with volatile liquids. Otherwise, the anemometer housing may be deformed and discolored. When there are stains on the surface of the anemometer, it can be wiped with a soft fabric and neutral detergent.
10. Do not drop or stress the anemometer. Otherwise, malfunction or damage of the anemometer will result.
11. Do not touch the sensor part of the probe when the anemometer is charged. Otherwise, the measurement result will be affected or the internal circuit of the anemometer will be damaged.
Probe selection
Thermal probe of anemometer
The working principle of the thermal probe of the anemometer anemometer is based on the cold impact airflow to take away the heat on the thermal element, and with the help of an adjustment switch to keep the temperature constant, the adjustment current is proportional to the flow rate. When using thermal probes in turbulent flow, airflow from all directions hits the thermal element simultaneously, affecting the accuracy of the measurement results. When measuring in turbulent flow, thermal anemometer flow sensors tend to have higher indications than rotor probes. The above phenomena can be observed during pipeline measurement. Depending on the design that manages the turbulence in the pipe, it can occur even at low speeds. Therefore, the anemometer measurement process should be carried out on the straight section of the pipeline. The starting point of the straight line should be at least 10×D before the measurement point (D=pipe diameter, in CM); the end point should be at least 4×D behind the measurement point. The fluid cross section must not be obstructed in any way. (angular, resuspension, object, etc.)
Rotary probe of anemometer
The working principle of the rotating wheel probe of the anemometer is based on converting the rotation into an electrical signal. First, through a proximity induction head, the rotation of the rotating wheel is "counted" and a pulse series is generated, and then converted by the detector. Get the speed value. The large-diameter probe (60mm, 100mm) of the anemometer is suitable for measuring turbulent flow with medium and small flow velocity (such as at the pipe outlet). The small-diameter probe of the anemometer is more suitable for measuring the airflow with the cross-section of the pipeline more than 100 times larger than the cross-section of the expedition head.
