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PTL-200-08 流速仪

産品概述

PTL-200-08 流速仪，它应用声学多普勒效应原理制成的测流仪，采用超声换能器，用超声波探测流速。

産品特點

結構精巧、具有測量精度高，量程寬；可測弱流也可測強流；分辨率高，響應速度快；可測瞬時流速也可測平均流速；測量線性，流速檢定曲線不易變化；無機械轉動部件，不存在泥沙堵塞和水草纏繞問題；探頭堅固耐用，不易損壞，操作簡便等優點。

應用範圍

廣泛應用于洪澇災害監測、汙水排放、天然的河溪、市政給排水、水量流失/滲入監測、灌溉流程監測、河口和潮汐的研究、漁業/水利、海岸侵蝕研究、暗渠流程監測、道路排水監測、運河流程研究、江河流程監測。

技術參數

測量種類	流速、水深（溫度）?
用途	在線式測量
流速測量範圍（傳感器以上水深：20cm）	正流速是+0.03m/s~ +5.00m/s 负流速是-1.00m/s~? -0.03m/s（可定制其他流速范围）
流速測量分辨率	1mm/s??
流速測量精確度	測量流速的±2~3%
測量精度	水深測量範圍：0.02~3.00m，0.02~10.00m（訂貨前要確定最大水深）
水深測量分辨率	1mm? ? ? ? ?
水深測量精度	0.5%
溫度范围	0~60°C? ? ? ? ? ??
分辨率	0.1°C?
流量範圍	無流量測量功能
工作電壓	常规12~13VDC，最低工作電壓10.3VDC，最高是14VDC
輸出信號	RS485 MODBUS协议??
無線傳輸(選配件）	GPRS型RTU無線傳輸器
傳感器配套電纜長度	10米? ? ?
被測水道類型	管道、渠道、天然溪流、河流
液體酸堿度要求	PH值在6-8之間
液体溫度要求	0~60°C，非凝固
液体壓力要求	自然環境下，1個標准大氣壓

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"'TOP-SIDE GALAH! I gave a sort of assent--attended with nausea--and turned to my saddle, but he clung. "Why, how can he hang around that way, Smith, and he a suitor who's just killed her husband? Of course, now, he'd ought to know he can't ever be one henceforth. I'm sorry for him, but--" It occurred to the Doctor that here was an opportunity to investigate certain matters. Of course, there was always the chance of coming on the track obliquely. None knew better than Prout how frequently one crime interlocked with another, and how often in looking for one particular criminal another had been arrested. "That I leave you to guess," Bruce replied. "It is beyond me." "It--it proves nothing," she said with an effort, presently. "A pleasant face. Don't you think that she is a little like me?" And there was no avenue of escape whatever. She was alone with this man in a dark, deserted house. She had come there for a few needed trifles that she had left behind. Nobody had seen either of them enter. Why, it was a very premium upon murder and the lust for revenge! "4. Armand Fléchet, senator. As might be expected, the Parmenidean paradoxes provoked a considerable amount of contradiction and ridicule. The Reids and Beatties of that time drew sundry absurd consequences from the new doctrine, and offered them as a sufficient refutation of its truth. Zeno, a young friend and20 favourite of Parmenides, took up arms in his master’s defence, and sought to prove with brilliant dialectical ability that consequences still more absurd might be deduced from the opposite belief. He originated a series of famous puzzles respecting the infinite divisibility of matter and the possibility of motion, subsequently employed as a disproof of all certainty by the Sophists and Sceptics, and occasionally made to serve as arguments on behalf of agnosticism by writers of our own time. Stated generally, they may be reduced to two. A whole composed of parts and divisible ad infinitum must be either infinitely great or infinitely little; infinitely great if its parts have magnitude, infinitely little if they have not. A moving body can never come to the end of a given line, for it must first traverse half the line, then half the remainder, and so on for ever. Aristotle thought that the difficulty about motion could be solved by taking the infinite divisibility of time into account; and Coleridge, according to his custom, repeated the explanation without acknowledgment. But Zeno would have refused to admit that any infinite series could come to an end, whether it was composed of successive or of co-existent parts. So long as the abstractions of our understanding are treated as separate entities, these and similar puzzles will continue to exercise the ingenuity of metaphysicians. Our present business, however, is not to solve Zeno’s difficulties, but to show how they illustrate a leading characteristic of Greek thought, its tendency to perpetual analysis, a tendency not limited to the philosophy of the Greeks, but pervading the whole of their literature and even of their art. Homer carefully distinguishes the successive steps of every action, and leads up to every catastrophe by a series of finely graduated transitions. Like Zeno, again, he pursues a system of dichotomy, passing rapidly over the first half of his subject, and relaxes the speed of his narrative by going into ever-closer detail until the consummation is reached. Such a poem as the ‘Achilleis’ of modern critics21 would have been perfectly intolerable to a Greek, from the too rapid and uniform march of its action. Herodotus proceeds after a precisely similar fashion, advancing from a broad and free treatment of history to elaborate minuteness of detail. So, too, a Greek temple divides itself into parts so distinct, yet so closely connected, that the eye, after separating, as easily recombines them into a whole. The evolution of Greek music tells the same tale of progressive subdivision, which is also illustrated by the passage from long speeches to single lines, and from these again to half lines in the dialogue of a Greek drama. No other people could have created mathematical demonstration, for no other would have had skill and patience enough to discover the successive identities interposed between and connecting the sides of an equation. The dialectic of Socrates and Plato, the somewhat wearisome distinctions of Aristotle, and, last of all, the fine-spun series of triads inserted by Proclus between the superessential One and the fleeting world of sense,—were all products of the same fundamental tendency, alternately most fruitful and most barren in its results. It may be objected that Zeno, so far from obeying this tendency, followed a diametrically opposite principle, that of absolutely unbroken continuity. True; but the ‘Eleatic Palamedes’ fought his adversaries with a weapon wrested out of their own hands; rejecting analysis as a law of real existence, he continued to employ it as a logical artifice with greater subtlety than had ever yet been displayed in pure speculation.18 VI. VII. “Where’s the sack of sand?” "Si Klegg, go off and mind your own business, and let me attend to mine," yelled Shorty, struggling to free himself from his partner's iron grasp. "Am I goin' to be run over by every pin-feather snipe from West Point? I'll break him in two." Norma shook her head at the reflection. "I'm sorry." "Burn him down!—Burn him down!—the hemmed murderer!" He was just going to turn back into the room, his limbs aching pleasantly for the sheets, when he noticed a faint glow in the sky to southward. At first he thought it was a shred of sunset still burning, then realised it was too far south for June—also it seemed to flicker in the wind. Then suddenly it spread itself into a fan, and cast up a shower of sparks. There was a wicket in the northern gate, the common outlet for the domestics, which, as Holgrave had anticipated, the servitor had not closed after him. He entered, and stood within the court-yard; he heard the sound of voices, and the tread of feet, but no human being was near: he paused an instant to consider, and then, with the swiftness of a deer, he sprung towards the stables, and entered the one appropriated to the select stud of the baron. A lamp was burning, but the men who attended on the horses were now away, quaffing ale to the long life of the heir. The baroness's favourite palfrey was lying in a stall; he stept across the animal, and, after pressing his hands on various parts of the wall, a concealed door flew open, and a dark aperture was before him. He stooped and passed through, and ascended a long, winding flight of steps, till a door impeded his progress; he opened it, and stood in a closet hung round with dresses and mantles, and displaying all the graceful trifles of a lady's wardrobe. There was a door opposite the one at which he had entered, which led into the baroness's chamber, where there were lighted candles, and a blazing fire on the hearth. The floor was thickly strewn with rushes, and he could just perceive the high back of a chair, with the arms of the family wrought in the centre; he paused and listened; he heard the faint cry of a babe, and discovered, by the language of the nurse, that she was feeding it; then there was the hush-a-by, and the rocking motion of the attendant. In a few minutes, the sound of a foot on the rushes, and "the lovely babe would sleep," now announced to Holgrave that the child was deposited with its mother: then he heard the curtains of the bed drawn, and the nurse whisper some one to retire, as her ladyship was inclined to sleep; there was another step across the rushes, and a door was softly closed, and then for a few minutes an unbroken silence, which the nurse at length interrupted by muttering something about "whether the good father had come yet." Again there was a tread across the rushes, and the door again was gently closed; and Holgrave, after a moment of intense listening, stepped from the closet, and entered the chamber. In an elevated alcove stood the bed of the baroness; the rich crimson hangings festooned with gold cord, the drapery tastefully fringed with gold, even to the summit, which was surmounted by a splendid coronet. Holgrave, unaccustomed to magnificence, was for a moment awed by the splendid furniture of the apartment—but it was only for a moment—and then the native strength of his soul spurned the gaudy trappings; he stepped lightly across the spacious chamber; he unloosed the rich curtains—the heir of De Boteler was reposing in a deep slumber on a downy pillow; beyond him lay the exhausted mother, her eyes closed, and the noble contour of her face presenting the repose of death. For an instant, Holgrave paused: remorse for the deed that he was about to do sent a sudden glow across his care-worn face—but had not the baron destroyed his offspring? whispered the tempting spirit. He raised the babe from the pillows without disturbing its slumber—he drew the curtains, and—he reached the stable in safety, closed the secret door, and arrived at the postern, which was still unfastened, passed through, and gained his own door without impediment. HoME 激情大香蕉久久一本道尹人网 ENTER NUMBET 0015www.zmlaw.com.cn
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