One is the wireless alarm host, the advantage is easy installation, eliminating the need for wiring, saving installation costs, especially when monitoring the site from the alarm host a few hundred meters or even a few kilometers, the use of wireless host is currently the most feasible and most economical program. However, the following disadvantages are commonly found in wireless transmission methods:
First, the reliability is poor, and the wireless host is vulnerable to interference from other radio waves. Particularly, the frequency close to or the same as the receiving frequency will directly cause the communication distance of the entire wireless alarm system to drop or become unusable.
Second, the wireless channel is blocked. At the same time, the wireless host can only receive wireless signals in one position. If two positions start transmitting at the same time and end transmission at the same time, the host is likely to receive only a strong azimuth signal of the wireless signal or Both directions are unacceptable.
The other type is a wired alarm host: a wired connection (non-bus) between the site monitoring detector and the host. Its reliability is greatly enhanced compared with wireless, but there are still shortcomings, such as more wire consumption, installation and cabling cumbersome, and the monitoring site is far away from the host, the use of wired (non-bus), and sometimes the wire costs even far exceeds the alarm The system price is very uneconomical from the perspective of the user.
During the production of highway painting, put glass bead into paint based on the ratio of 18-25% (weight percentage), so that the highway paint can still keep reflectivity during wear and friction. The ratio is refer to the specification of Communication Industry Standard of the People`s Republic of China No. JT/T280-2004, the standards which is different in different countries and areas.
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The appearance of glass bead should be colorless, loosen and spherical particle, should be clean without impurity, and without agglomeration |
According to the specification of Communication Industry Standard of the People`s Republic of China No.GB/T24722-2009, the granulometry is shown in the table below:
The glass bead can be produced based on the standard of countries or areas, such as EN1423/1424, AASHTO M247, BS6088, JIS R3301 and KS L2521 etc.
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