C/U Channel&Ceiling Roll Forming Machine
Our light steel keel roll forming machine can be profile custom,and are lower cost,high efficiency,reliable working ,low energy consumption.we can do any type of equipment according to customer requirements.
Light steel keel is good in bending resistance, straightness, and it can cut, punch automatically, it is very easy and convenient to use. It can be used as bearing structure in big and medium sized building, such as factories, warehouses, garages, hangars, gyms, exhibitions, theater and so on.
C/U Channel&Ceiling Roll Forming Machine C Channel Ceiling Roll Forming Machine,U Channel Ceiling Roll Forming Machine,C/U Steel Ceiling Roll Forming Machine,C/U Galvanized Ceiling Roll Forming Machine Cangzhou Feiyang Machiney Manufacturing Co., Ltd. , http://www.coldformingmachines.com
However, it is difficult to maintain the stability of the wind direction sensor with the wind speed and direction recorder in actual work. The time of 2 and 4 minutes is very difficult. It may happen that the computer reading time is precisely the time when the calibration personnel manually or gusts affect the reading error. The reading error is quite large and the technical specifications require. The error of the wind direction sensor is 3 ", the actual field calibration needs to read a few flashes of data at each point to complete the task, through two years of on-site calibration and analysis of the principle of the automatic station wind direction sensor and the production of the existing four factories in our province For the anatomy of the wind direction sensor, we have made it easier and more accurate to calibrate the wind direction sensor with our own wind direction calibrator.
The automatic weather station wind direction sensor adopts 7-bit gray code encoding method to perform photoelectric conversion, converts the angular displacement of the shaft into a digital signal, and the CPU of the collector solves and calculates according to the corresponding formula to obtain the corresponding wind direction value. Gray code is a kind of cyclic code. There is only one bit change between two adjacent codes. The code plate rotates with the wind vane. The code of the position of the wind mark is determined by 7 pairs of photoelectric control tubes. In practical use, only 7 pairs of photoelectric control tubes are needed. It is not bad, the circuit in the wind direction sensor works normally, the wind direction sensor does not need to check, only need to zero, our own wind speed recorder is judged by the conduction of 7 LED diodes in the circuit. 7 The on-off of the optoelectronic tube, which determines the quality of the wind direction sensor, as long as the 7 pairs of photoelectric control tube work properly, when the wind direction sensor wind vane, the wind direction wind speed calibrator 7 LED Different lights.
Verification is very convenient, but also different machine connection, in this way to determine whether the wind direction sensor is working faster than the EB11 type wind direction verifier is faster and more accurate, we see the appendix in the gray number table, if we Only calibrated 00, 900, 1500, 2700. Then 7 pairs of low-level optoelectronics are difficult to detect even if they are bad. Our provincial calibration actually calibrates 00, 450, 900, 1350, 1800, 225, 270, and 315. Even such low 7 pairs The photocell still cannot be tested for every bit, for which we have added 239 "measurement, see from the appendix 239" is 7 pairs of photocell all 1 state, only in this way can we judge that the wind direction sensor is qualified.
The calibration of the wind speed and direction recorder with the wind direction calibrator can accurately determine the corresponding problems and save time and convenience. The wind direction calibrator is only designed for the convenience of work in our actual work. Whether this method can be used to replace the existing on-site calibration remains to be recognized by experts.
Wind speed and direction recorder on-site calibration method
One of the main elements of an automatic weather station is the wind direction wind speed. Calibration of the wind speed and direction recorder needs to be performed in accordance with the instructions. The wind checker is placed on a balanced countertop and requires adjustment of the level while also installing the wind direction sensor on the wind checker so that the zeros coincide. This requires that a full set of back-up automatic weather stations must be provided for on-site calibration or must be calibrated on the current instrument.