What are the working modes of the anemometer
An anemometer is a speed measuring instrument that converts a flow velocity signal into an electrical signal, and can also measure fluid temperature or density. The principle is that a thin metal wire heated by electricity (called dedicated line) is placed in the airflow, the heat dissipation of the dedicated line in the airflow is related to the flow velocity, and the heat dissipation causes the temperature change of the dedicated line to cause a change in resistance, and the flow velocity signal is transformed into electric signal.
It has two working modes:
①Constant flow type. The current through the special line remains constant. When the temperature changes, the resistance of the special line changes, so the voltage at both ends changes, and the flow rate is measured;
②Constant temperature type. The temperature of the dedicated line remains constant, such as 150°C, and the flow rate can be measured according to the required applied current.
The constant temperature type is more widely used than the constant flow type.
In addition to the ordinary single-line type, the special line can also be a combined two-line or three-line type to measure the velocity components in each direction. The electrical signal output from the special line is amplified, compensated and digitized and then 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 time-average value, total speed and partial speed, and turbulence. and other measurements of turbulence parameters.
What is the operation of an anemometer?
Anemometer is an instrument for measuring air velocity, and its products are widely used in environmental testing, security, atmospheric monitoring and other fields.
The following is a detailed introduction to the specific operation steps of the anemometer:
1. Before use, observe whether the pointer of the meter points to the zero point. If there is any deviation, you can gently adjust the mechanical adjustment screw of the meter to make the pointer return to the zero point;
2. Put the correction switch in the off position
3. Insert the plug of the measuring rod into the socket, place the measuring rod vertically upward, press the screw plug tightly to seal the probe, put the "calibration switch" at the full position, and slowly adjust the "full scale adjustment" knob to make the meter pointer point to in the full position;
4. Put the "calibration switch" at the "zero position", and slowly adjust the two knobs of "coarse adjustment" and "fine adjustment" so that the pointer of the ammeter points to the zero position
5. After the above steps, gently pull the screw plug to expose the probe of the measuring rod (the length can be selected according to the needs);
And make the red point on the probe face the wind direction, and check the calibration curve according to the meter reading to find out the measured wind speed;
6. After measuring for several minutes (about 10 minutes), the above steps 3 and 4 must be repeated once to standardize the current in the meter
7. After the measurement, the "calibration switch" should be placed in the off position.
An anemometer is a speed measuring instrument that converts a flow velocity signal into an electrical signal, and can also measure fluid temperature or density.
The principle is that a thin metal wire heated by electricity (called a hot wire) is placed in the airflow, the heat dissipation of the hot wire in the airflow is related to the flow velocity, and the heat dissipation causes the temperature change of the hot wire to cause a change in resistance, and the flow velocity signal is transformed into electric signal.
