Linear displacement sensor is designed to control movement of various objects, goods elevator cabs, hydraulic lifts in the loading system, etc., that is, in systems that require accurate information on the status of the object during its motion. By way of removing the information of linear displacement sensors are divided into contact and contactless. In turn, divided into proximity sensors with mobile mechanical parts and do not have. Optical and infrared sensors of linear displacements are non-contact and have no mechanical moving parts. Inductive and magnetic sensors of linear displacements are non-contact, but with mechanical moving parts. By contact is resistive sensor. The main characteristic of all types of sensors is to determine the absolute position, movement and speed. To obtain Information from sensors is used RS-485 interface.
Maximum cable length by which one can transmit a signal up to 500 meters Operating temperature -40 C to +60 C. Measured path length from 1 mm to 5000 mm (or 10 000 mm). Individual attention deserves a special series of non-contact electronic sensors Start Electron.com (SE Series) designed for hydraulic mechanisms, where the sensor is operating in harsh conditions with environmental stresses. K advantages of these sensors are: high accuracy of measurement of the distance measured by the protection system from external influences, including vibration; ease of use, a high degree of dust and moisture protection the point when power is off, long service life – due to non-contact measurement method, a high linearity, repeatability and resolution;
Here are the results of tests of some manufacturers radios for maximum power transfer: Colibry FR-7 – 10 dB; Vector VT-46 Privat – 13 dB; Vector VT-43 – 13.5 dB; u6 owl – 13.5 dB; Midland G- 225 – 15 dB u5 owl – 16 dB; Optim WT-415 – 17.5 dB; Vector VT-43H – 21 dB; Kirisun RT 3200 – 24 dB; Vector VT-44 Mil – 26 dB; Midland GXT-400 – 27 dB. To reduce the impact of foreign objects the subjects were assigned to the radio distance of 7 km. All radios were tested in the 20-th channel at maximum capacity. Radiated power at the receiver was measured with a voltmeter. There are many manufacturers of radios. However, Russia is not always possible to buy the radio of suitable quality.
When buying a radio should pay attention to its technical characteristics: the range (up to 3km – 18km more) By power (0.5 W – 5 W) for the battery (NI-MH, Li-on, AAA); terms of functionality (voice activation, the function of PTT (press-to-Talk), channel scan, battery power, the tone of the call, volume control, LCD-display lighting). Radio on the scope to do: wear; Avtomobilnye.Nosimye radio. The fame of mark the radio does not guarantee against forgery. A competent shop provides a guarantee from the manufacturer radio, a quality certificate. When buying a radio always be careful, pay attention to the integrity of the radio, its completeness: Standard Li-Ion battery; Desktop Charger, Multi-channel is also a factor for the purchase of radio; strap for wearing around the neck; clip, with the help of which radio is attached to your belt, pocket, battery cover, is it difficult to open it, is important in the radio and the interface displays and buttons.
Typically, these models allow you to connect the individual and also for takeout device, one or two additional video cameras, some have built-in video memory. At this point interface card with access outside panel designed primarily for black and white video monitors, but soon to appear relevant to the design and color models. A few words about the additional opportunities. A number of models allows you to connect an additional block of graphics memory (and some Videophones have already built the video memory). In this case, the video phone is transformed into a kind of 'videoavtootvetchik' or mini DVR – video visits can be recorded using the button, and in the absence of the owner – automatically. Later, these images can be viewed, deleted or retained.
If access to the functions of the video door must have a few rooms, you can choose models allowing parallel work of several video monitors (up to 4) additional connection audiotrubki, which operates in parallel with the monitor and performs all its functions, except for watching video. Often before they let the visitor, it is necessary not only to see it, but view the situation in other places around the corner, near the front door, in the elevator lobby, etc. You must use videomonitry, allowing you to connect additional cameras (street, hidden, body, etc.), in turn allowing you to display video from all connected cameras in the simplest described above Video door configuration is missing one very important and useful feature – opening the door to let the visitor when necessary.
Now the Internet has many opportunities to build your website. If you need a personal page, then make it not so difficult … Just a few steps. 1) Planning. The first and very important stage of development of the site – a detailed planning.
All errors and flaws of a lot easier to fix when the creation of a site still in its infancy, that is – on paper. Agree, much easier to wipe the whole thing using an eraser, then half a day than mess around with already the current page. The overwhelming number of people believe that on paper should apply only the basic elements of site structure. I assure you that the clearer and more detailed you describe your site, the easier you will be in next! The second phase – development of a clear hierarchy of the site. Somewhere in my address book mark – where and what files are placed to be.
For example, images in the folder img, a third-party page – another, and so on … And actually, before You is a clear site structure, branching system directory showing the hierarchy of files on your site … 2) The program's interface and basic attributes. Well, when this whole thing is ready, it's time to begin creating your first page. Editor, which will vargan page, we call – Macromedia Dreamweaver. You can get it anywhere, and simple – go to the store and buy a CD with the program since the program weighs a bit much 50 mb. Immediately on the note to you: recommend eighth version, because it is based on Macromedia Dreamweaver 8.0. Start the editor, there is an inscription on Slap Create New => HTML. Well, before you is the same program in which we will create your first page. Occupies most of the Working Area (visually, it will prepare your masterpiece), is located above the dashboard, and bottom – the properties panel.