| 3151/3051投入式液位變送器給水工控使用原理 |
| 信息來(lái)源： 液位變送器生產(chǎn) | 2020-09-29 點(diǎn)擊量： 6335 |
3151/3051投入式液位變送器的傳感器局部可直接投入到液體中，變送器局部可用法蘭或支架固定，裝置運(yùn)用極為便當(dāng)，應(yīng)用靜壓式采用洛斯蒙壓力傳感器原裝組件消費(fèi)，主要用于城市給排水，水處置廠、水庫(kù)、河流、海洋、儲(chǔ)油罐、及石油、化工、電力等部門(mén)的液位丈量。
The sensor part of 3151 / 3051 input type liquid level transmitter can be directly put into the liquid. The transmitter can be fixed by flange or bracket, so the device is very convenient to use. The static pressure type adopts the original components of losmond pressure sensor. It is mainly used for the liquid level of urban water supply and drainage, water treatment plant, reservoir, river, ocean, oil tank, petroleum, chemical and electric power departments Measurement.
被測(cè)介質(zhì)能夠是水、油、酸性、堿性及稀薄性液體。儀表輸出二線制4~20mADC規(guī)范電流信號(hào)，具有技術(shù)先進(jìn)、精度高、質(zhì)量穩(wěn)定牢靠，裝置運(yùn)用便當(dāng)?shù)葍?yōu)點(diǎn)，是一種過(guò)程檢測(cè)控制系統(tǒng)中理想的液位儀表。
The measured medium can be water, oil, acid, alkaline and thin liquid. The instrument outputs 4 ~ 20mADC standard current signal with advanced technology, high precision, stable and reliable quality, and easy to use. It is an ideal liquid level instrument in process detection and control system.
3151/3051投入式液位變送器采用靜液壓測(cè)量原理，當(dāng)測(cè)量探頭放入液體中時(shí)，設(shè)大氣壓力為Po，液面到測(cè)量元件高為h，液體密度為r，當(dāng)?shù)刂亓铀俣葹間，則變送器探頭上所受壓力為：Pl＝Po+r×g×h，敏感元件的負(fù)側(cè)通過(guò)導(dǎo)氣電纜與大氣相通所受壓力為：P2=Po于是測(cè)量元件所測(cè)到的壓力差值為：P= Pl-P2=r×g×h，對(duì)于特定的液體介質(zhì)和確定的地區(qū)，r和g均為常數(shù)，于是P口h，即可由儀表輸出電流大小得到液位高度，即水深。
The 3151 / 3051 input type liquid level transmitter adopts the principle of hydrostatic pressure measurement. When the measuring probe is put into the liquid, the atmospheric pressure is Po, the height from the liquid level to the measuring element is h, the liquid density is r, and the local gravity acceleration is g, then the pressure on the probe of the transmitter is: PL = Po + R × g × h, and the negative side of the sensitive element is connected with the atmosphere through the gas conducting cable, and the pressure is P2 = Po The measured pressure difference is: P = pl-p2 = R × g × h. for a specific liquid medium and a certain area, R and G are constants, so the liquid level height, i.e. water depth, can be obtained from the output current of the instrument at port P H.
3151/3051投入式液位變送器給水工控使用原理
Application principle of 3151 / 3051 input type liquid level transmitter for water supply industrial control
因?yàn)閿?shù)據(jù)不準(zhǔn)確的原因來(lái)自水流的沖擊，那么我們安裝投入式液位變送器時(shí)只要避免液體下流時(shí)壓力直接沖擊探頭，或者用其他的物體擋住液體下流時(shí)候那瞬間直接沖擊的壓力就可以了。
Because the data is not accurate because of the impact of water flow, so when we install the input type liquid level transmitter, we only need to avoid the direct impact of the pressure on the probe when the liquid flows down, or use other objects to block the pressure of the instant direct impact when the liquid flows down.
方法一、把進(jìn)水口裝成淋浴式的，把一股大水流切斷成小水流噴灑下來(lái)，效果還不錯(cuò)；
Method 1. Install the water inlet into a shower type, cut off a large stream of water and spray it down into a small one, and the effect is good;
方法二、把進(jìn)水管口彎一下，使進(jìn)水口略微往上翹一點(diǎn)，水在出來(lái)時(shí)會(huì)*先往空中拋然后再落下，減少了直接沖擊(將動(dòng)能轉(zhuǎn)換成勢(shì)能)。
Method 2: bend the inlet pipe to make the water inlet slightly upward. When the water comes out, the water will be thrown into the air first and then fall down, thus reducing the direct impact (converting kinetic energy into potential energy).
方法三、在水中安裝內(nèi)徑45mm左右鋼管，水流入口反方向位置打若干小孔，液位計(jì)探頭安裝在鋼管內(nèi)可以減少?zèng)_擊，提高穩(wěn)定性。
The third method is to install a steel pipe with an inner diameter of about 45mm in the water. A number of small holes are drilled in the opposite direction of the water inlet. The probe of the liquid level meter is installed in the steel pipe, which can reduce the impact and improve the stability.
3151/3051投入式液位變送器給水工控使用原理
Application principle of 3151 / 3051 input type liquid level transmitter for water supply industrial control
·注明測(cè)量范圍（液位高度），對(duì)于一些特殊介質(zhì)，注明介質(zhì)的密度。
·Indicate the measurement range (liquid level height), and for some special media, indicate the density of the medium.
·選型時(shí)，應(yīng)注意被測(cè)介質(zhì)與產(chǎn)品接觸的材料相兼容，對(duì)于特殊介質(zhì)，可訂制。
·When selecting the type, it should be noted that the tested medium is compatible with the material contacted with the product. For special media, it can be customized.
·將投入式液位變送器安裝于多雷雨地區(qū)時(shí)，訂貨時(shí)應(yīng)注明“防雷”，建議用戶在現(xiàn)場(chǎng)安裝防雷擊保護(hù)裝置，并確保產(chǎn)品及電源接地。
·When the input type liquid level transmitter is installed in Thunderstorm area, the "lightning protection" shall be indicated when ordering. It is suggested that the user should install lightning protection device on site and ensure that the product and power supply are grounded.
·關(guān)于導(dǎo)氣電纜長(zhǎng)度的選?。阂话惚葘?shí)際液位高度長(zhǎng)10cm，不宜太長(zhǎng)，如果現(xiàn)場(chǎng)到控制柜距離很遠(yuǎn)，請(qǐng)選用優(yōu)質(zhì)導(dǎo)線電纜代替，不需要導(dǎo)氣電纜，導(dǎo)氣電纜做引線，使用中會(huì)出現(xiàn)問(wèn)題，由于環(huán)境因素、工人因素如亂踩會(huì)使投入式液位變送器的導(dǎo)氣性能變差，亂壓造成氣不通，亂折容易把出氣口睹起來(lái)。建議用優(yōu)質(zhì)電纜代替，就不會(huì)出現(xiàn)以上故障了！
·The selection of gas conducting cable length: generally, it is 10cm longer than the actual liquid level height, and should not be too long. If the distance from the site to the control cabinet is far away, please use high-quality conductor cable instead. There is no need for gas conducting cable. As the lead wire, there will be problems in the use. Due to environmental factors and workers' factors, such as trampling, the air conduction performance of the input type liquid level transmitter will be deteriorated and the pressure will be disorderly It is easy to see the air outlet if the air is blocked. It is recommended to use high-quality cable instead of the above fault!
3151/3051投入式液位變送器給水工控使用原理
Application principle of 3151 / 3051 input type liquid level transmitter for water supply industrial control
二次儀表的硬件設(shè)計(jì)主要包括電源設(shè)計(jì)，A/D轉(zhuǎn)換設(shè)計(jì)，單片機(jī)外圍電路設(shè)計(jì)，顯示、報(bào)警、繼電控制設(shè)計(jì)，遠(yuǎn)端通訊設(shè)計(jì)等。電源設(shè)計(jì)主要考慮變壓器應(yīng)有足夠的耐壓和功率的降額設(shè)計(jì)，變壓器屏蔽層應(yīng)接地。二次儀表中的模擬部分和數(shù)字部分及控制繼電器應(yīng)由不同的變壓器副邊線圈供電，以防止大脈沖電流和電源波動(dòng)的影響。整個(gè)電源在線路板的布局應(yīng)遠(yuǎn)離信號(hào)線路部分。
The hardware design of secondary instrument mainly includes power supply design, a / D conversion design, MCU peripheral circuit design, display, alarm, relay control design, remote communication design, etc. The power supply design mainly considers that the transformer should have enough withstand voltage and power derating design, and the shielding layer of the transformer should be grounded. The analog part and digital part of the secondary instrument and the control relay should be powered by different transformer secondary coils to prevent the influence of large pulse current and power supply fluctuation. The layout of the whole power supply in the circuit board should be far away from the signal circuit part.
A/D轉(zhuǎn)換芯片的選取應(yīng)注重于產(chǎn)品的穩(wěn)定性和可靠性，產(chǎn)品在出廠前應(yīng)經(jīng)過(guò)嚴(yán)格的老化和篩選。A/D的外圍電路的設(shè)計(jì)應(yīng)特別注意參考電壓的穩(wěn)定性。單片機(jī)外圍電路設(shè)計(jì)以基本程式化，但其通訊端口的軟硬件設(shè)計(jì)與A/D轉(zhuǎn)換芯片的數(shù)據(jù)交換方式有關(guān)，液位測(cè)量對(duì)測(cè)量頻率要求不高，單片機(jī)與A/D轉(zhuǎn)換芯片之間的數(shù)據(jù)交換可采用串口查詢方式，這樣程序結(jié)構(gòu)清晰，便于編寫(xiě)和調(diào)試。
The selection of a / D conversion chip should pay attention to the stability and reliability of the product, and the product should go through strict aging and screening before leaving the factory. Special attention should be paid to the stability of reference voltage in the design of peripheral circuit of a / d. The peripheral circuit design of single chip microcomputer is basically programmed, but the software and hardware design of its communication port is related to the data exchange mode of a / D conversion chip. The requirement of measurement frequency for liquid level measurement is not high. The data exchange between single chip microcomputer and a / D conversion chip can adopt serial port query mode. This program structure is clear and easy to write and debug.
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