Anemometer Operating Modes
An anemometer is a speed measuring instrument that converts flow velocity signals into electrical signals and can also measure fluid temperature or density. The principle is to place a thin metal wire (called a dedicated wire) that is electrically heated in the airflow. The heat dissipation of the dedicated wire in the airflow is related to the flow rate, and the heat dissipation causes a change in the temperature of the dedicated wire, which in turn causes a change in resistance. The flow rate signal is then converted into an electrical signal.
It has two working modes:
① Constant current type. When the current through the dedicated line remains constant and the temperature changes, the resistance of the dedicated line changes, resulting in a change in the voltage at both ends, and thus measuring the flow rate;
② Constant temperature type. The temperature of the dedicated line remains constant, such as 150 ℃, and the flow rate can be measured based on the required applied current.
Constant temperature type is more widely used than constant current type.
In addition to the ordinary single line type, the dedicated line can also be a combined double line or triple line type, used to measure the velocity components in various directions. The electrical signal output from the dedicated line, after amplification, compensation, and digitization, can be input into the computer to improve measurement accuracy, automatically complete the data post-processing process, expand the speed measurement function, and simultaneously measure instantaneous and mean values, combined and partial velocities, turbulence intensity, and other turbulence parameters.
What is the operation of an anemometer?
Anemometer is an instrument for measuring air flow velocity, which is widely used in fields such as environmental monitoring, security, and atmospheric monitoring.
Below is a detailed introduction to the specific operation steps of an anemometer:
1. Before use, observe whether the pointer of the electric meter points to zero. If there is any deviation, gently adjust the mechanical adjustment screw of the electric meter to make the pointer return to zero;
2. Place the calibration switch in the off position
3. Insert the measuring rod plug into the socket, place the measuring rod vertically upwards, tighten the screw plug to seal the probe, place the "calibration switch" in the full position, slowly adjust the "full adjustment" knob to make the meter pointer point to the full position;
4. Place the "calibration switch" in the "zero position" and slowly adjust the "coarse adjustment" and "fine adjustment" knobs to make the meter pointer point to the zero position
5. After the above steps, gently pull the screw plug to expose the measuring rod probe (length can be selected according to needs);
And make the red dot on the probe face the wind direction. Based on the reading of the electricity meter, check the calibration curve to find out the measured wind speed;
After measuring for several minutes (about 10 minutes), steps 3 and 4 above must be repeated once to standardize the current inside the instrument
After the test is completed, the "calibration switch" should be placed in the off position.
