Anemometer with those functions
the velocity signal into electrical signal a speed measuring instrument, also can measure fluid temperature or density. Its principle is that the thin wire of a electric heat ( Call hotline) Put in air, hot line heat dissipating capacity is related to flow velocity in the air, and hotline temperature change caused by the resistance resulting from heat dissipating capacity of the velocity signal is transformed into electrical signals.
anemometer is mainly with the wind tunnel laboratory experiments. Under the guidance of the teacher, the students understand the principle, instrument performance and operation method, the wind tunnel experiment period of actual measurement; The test for the part of the research projects.
the velocity signal into electrical signal a speed measuring instrument, also can measure fluid temperature or density. The function of the anemometer its principle is that will be a fine wire of electric heat ( Call hotline) Put in air, hot line heat dissipating capacity is related to flow velocity in the air, and hotline temperature change caused by the resistance resulting from heat dissipating capacity of the velocity signal is transformed into electrical signals. It has two working modes:
1) constant flow. Through hotline current remain unchanged, the temperature change, the hotline resistance to change, and both ends of the voltage changes, the measured velocity; (2) the thermostat. Hotline temperature remains constant, such as 150 ℃, applying current can be measured according to the required flow rate. Thermostat than constant flow application more widely. Line length is in commonly 0. 5 ~ 2 mm range, range from 1 to 10 microns in diameter, material for platinum, tungsten and platinum rhodium. If a piece of very thin ( The thickness is less than 0. 1 micron) Metal film instead of metal wire, is the hot film anemometer, function and hot wire are similar, but more for measuring the liquid flow rate. Hotline in addition to the ordinary single type, also can be a combination of double wire or 3 line, used to measure velocity component in all directions. From the hotline output electric signal, after amplification, compensation, and digital input computer, can improve the accuracy of measurement, automatic data post-processing process, expanding speed function, such as the completion of instantaneous value and at the same time points and the mean and speed, turbulence and other turbulence parameters measurement. Hot wire anemometer, compared with pitot probe small volume, little interference flow field; Fast response, to measure the unsteady flow speed; To measure very low speed ( Such as low as zero. 3 m/s) Wait for an advantage.
1, flow: when measuring the wind flow, the indicator
2, AVG: when measuring the average ( A method of measuring wind flow) This indicator
3, minimum: according to the minimum
4, two-thirds V biggest: two-thirds of the maximum measurement ( A method of measuring wind flow)
5, read: when reads the stored data, the indicator light show
6, records: records are using the digital signal and
7, speed: when measuring wind speed, the lights
8, USB: when the computer with USB connection, this
9, maintain: data maintain
10 m/s: wind speed unit ( Meters per second)
11, Km/h: wind speed unit ( Km/hour)
12, Ft/min: wind speed unit ( Feet per minute)
13, Knot: wind speed unit ( Nautical miles per hour)
14, Mph: wind speed unit ( In an hour)
15, CFM: wind flow unit ( Cubic feet per minute)
16, CMM: wind flow unit ( Cubic meters per minute)
17, CM2: m2 in the flow function is used to display area of the square pipe, ℃ under metric unit is used to display the blast temperature.
18, FT2: FT2 is under the function of the wind flow display area of pipeline feet square, under the metric unit, used to indicate air volume F.
19, pipeline area display area
20, low battery power display, if this in the show, please replace the battery.
21, if the measured results of more than 9999, showed x100 or x100
22, wind speed and flow display area
23, when backlit opens, the signal display
24, blast temperature signal
25, small fan signal: according to air temperature data
26, big fan: according to wind speed/flow state, according to the wind speed and rotation adjustment
27, infrared measurement signal
28, laser open signal