Visibility Monitoring System - A visibility sensor #2022 for positive detection has been updated

Visibility Monitoring System - A Visibility Sensor #2022 for Active Detection has been updated [Brand Model: TRW Environment TH-N50] رؤيةالاستشعارIn the Arctic or mountainous areas with particularly clean air, visibility can reach 70~100km, but visibility is usually reduced
due to air pollution and moisture.
Haze (dry) or fog (wet)
is reported at weather stations everywhere.
Smoke reduces visibility to zero, which is dangerous for driving a boat, as is driving in desert areas where sandstorms occur and where there are forest fires
.
[Equipment Name]: Atmospheric Visibility Meter [Visibility Definition]: Atmospheric visibility is defined as the maximum ground horizontal distance
that a person with normal vision can see clearly in the contours of the target under the weather conditions at that time.
【Function introduction】: The emission end of the atmospheric visibility measuring instrument emits infrared light through the infrared LED light source, the infrared light source transmits a certain volume of air, and the infrared light source is scattered by the gas molecules, aerosol particles, fog droplets, etc.
in the air, and the receiving end of the visibility measuring instrument determines the visibility distance by receiving the intensity of the scattered light of the infrared light source, and the instrument can continuously measure the visibility output
.
[Detection principle]: 35° forward scattering principle, more accurate
measurement.
【Overall appearance】: The overall wrap-around integrated design makes the layout of the internal cable more reasonable
.
[Measuring element]: optical component lens, infrared LED light source
.
【Hardware protection design】:(1), the optical components lens face down and with a protective cover to effectively prevent precipitation, droplets or dust from entering the lens, reduce the contamination of the probe surface, this design provides accurate measurement results and reduces the need for
maintenance.
(2) The protective cover of the probe is aluminum alloy material, and the surface is coated with anti-corrosion glass fiber coating
.
(3) The overvoltage and electromagnetic protection devices of the visibility meter can ensure the long-term safe operation
of the sensor.
(4) Infrared LED light source, increase filter design, anti-light source interference
.
(5) Low power consumption, internal circuit anti-interference design
.
(6) The DC power supply circuit of the instrument has the dual design
of anti-reverse connection and self-recovery insurance.
【Equipment list】: 1 atmospheric visibility measuring instrument + 2 hoops
.
【Installation precautions】:(1) Install the visibility sensor about 2 meters from the ground
.
(2) Ensure that there are no other objects below the visibility to interfere with the test
.
(3) The ideal installation site should be at least 100 meters away from large buildings or other facilities that generate heat and hinder rainfall, and also avoid the influence
of tree shade.
(4) The site should be free of obstacles, reflective surfaces and obvious pollution sources
that interfere with optical measurement.
(5) Select a suitable place to install the equipment, the equipment provides installation hoops, use the hoops to install the equipment on the 75mm pole, in order to avoid light source interference, the transmitting end must be on the south side
.
[Power supply mode]: 10-30VDC wide voltage power supply
.
【Measuring range】: default 0-500000m
.
[Measurement error]: ≤1KM±2%; ±10%> 1KM
。 [Resolution]:1M【Update interval】:20s【Average none.
Failure time] :(MTBF) greater than 18000 hours [working environment temperature]: -40~60 °C [working relative humidity]: not more than 95% (30 °C) [weight]: less than 10kg [power consumption]: 0.
5w [infrared wavelength]: 870nm [signal output mode]: RS485, standard modbus-rtu protocol [measurable visibility data type] :(1), real-time visibility value (2), visibility 10min average (3), visibility 1min average [ Optical lens cleanliness level]: can read the cleanliness of the infrared light transmitting end and the receiving end in real time, the cleanliness level is 1-5, 5 represents the highest cleanliness, when the cleanliness is less than 3, the optical lens
needs to be cleaned on site 。 【Common sense of visibility】 :1.
Visibility 20-30 km Extremely good vision 2.
Visibility 15-25 km Visibility Good vision is clearer 3.
Visibility 10-20 km Visibility is average 4.
Visibility 5-15 km Poor visibility Poor vision is not clear 5.
Visibility 1-10 km Light fog visibility is poor 6.
Visibility 0.
3-1 km fog visibility is very poor 7.
Visibility is less than 0.
3 km Heavy fog visibility is extremely poor 8.
Visibility is less than 0.
1 km Dense fog visibility is extremely poor