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Environmental Detection Sensor Working Principle

- Jul 21, 2017 -



Environmental Detection Sensor working principle

The Environmental Detection Sensor consists of two parts: the thermal sphere Environmental Detection Sensor and the measuring instrument. The sensor has a tiny glass ball in its head and a nickel wire coil with heated glass inside it and two tandem thermocouples. Connection of the cold junction of the thermocouple in phosphor bronze pillars, directly exposed to the airstream, when a certain size of electric current through the heating coil, raise the temperature of glass ball, the extent of the rise and airflow velocity, velocity of hours higher degree is big, whereas higher degree. The magnitude of the increase is indicated on the meter by the electric potential of the thermocouple. Therefore, after calibrating the calibration, the meter reading can be used to indicate the velocity of air flow.

Environmental Detection Sensor is a kind of portable, intelligent low wind speed measuring instrument, measuring pipeline environment, heating, air conditioning and refrigeration and environmental protection, energy conservation monitoring, meteorology, agriculture, refrigerating, drying, labor health survey, clean workshop, chemical fiber textile, all kinds of wind velocity experiment, etc, with extensive USES.

Wind speed testing has the test of average wind speed and turbulence composition (wind turbulence 1 ~ 150KHz, and variation). The method of average wind speed is tested with thermal, ultrasonic, impeller type and leather tubule.

The velocity measurement range of 0 to 100m/s can be divided into three sections: low speed: 0 to 5m/s; Medium speed: 5 to 40m/s; High speed: 40 to 100 meters per second. The heat sensitive probe of anemometer is used for accurate measurement of 0 to 5m/s; It is ideal to measure the flow rate of 5 to 40m/s by the rotating probe of anemometer. And the use of pitot tube can get the best results in a high speed range. Correct selection of the flow rate of the anemometer temperature probe is an additional standard, generally the use of thermal Environmental Detection Sensor anemometer temperature estimated + 7 ˚ C. Special anemometer wheel probe can reach 35 ˚ C. Pitot tube used to + 35 ˚ C above.

The Environmental Detection Sensor is a kind of instrument which can measure the low wind speed. The range of measurement is 0.05 ~ 10m/s. The Environmental Detection Sensor is composed of two parts: probe and measuring instrument. The probe has a glass ball with a diameter of 0.6mm, with a nickel-chrome-coil and two tandem thermocouples in the ball. The cold end of the thermocouple is attached to the pole of the phosphorus copper and is directly exposed to the air flow. When the current of a certain size passes through the heating coil, the temperature of the glass bulb rises. The extent of the increase is related to wind speed, and the speed of the wind is increasing. Conversely, the degree of elevation is small. The magnitude of the increase is indicated by the thermocouple on the meter. According to the meter reading, check the calibration curve to find out the wind speed (m/s).

Environmental Detection Sensor is an Environmental Detection Sensor which USES pressure change to measure height. The high value of the processor is calculated at the height of the measurement, so the output digital signal is used in the selection of air pressure Environmental Detection Sensor.

Environmental Detection Sensor is by air pressure change detection sensor to measure the height of the environment, so in the process of measurement is not affected by obstacles, measure the height range, convenient to move, absolute altitude and relative height measurement can be performed. Through pressure and temperature to calculate the height of the error is relatively large, especially in the surface measurement, influenced by wind, humidity and dust particles, measure the height of the precision affected by a lot, in the high altitude measurement precision is improved.

The formula for calculating height through air pressure and temperature is as follows:

Close to the ground, and every day the pressure change and temperature change is bigger, so the air pressure and temperature to calculate the altitude there is biggish error, even if the Environmental Detection Sensor on the same level without moving, at different times in the morning and evening to measure out the absolute altitude also may appear larger error.

The principle is to measure the Angle of the Angle between the slider and the base line to convert the corresponding iron plate height. This method is for contact measurement. Measure the angular displacement sensors have a variety of environmental detection, namely the potentiometer type Angle detection sensor, the grating type Environmental Detection Sensor, the magnetic grid type Angle detection sensors, code disc Environmental Detection Sensor, etc. This kind of Environmental Detection Sensor can be accurately measured paver in paving operations of Environmental Detection Sensor installed on the traction arm corresponding Angle, thus can figure out the height of the screed to accordingly. A common feature of Environmental Detection Sensor is linearity, wide temperature range and long working life. But due to in the construction of Environmental Detection Sensor for non-contact measurement of height, Environmental Detection Sensor on the baseline sliding when easy to cause the vibration on the line, so, this kind of Environmental Detection Sensor slider often equipped with a vertical symmetry end balance weight.

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