| 3151/3051插入筒式液位變送器儀表維護(hù)易忽視哪六個因素 |
| 信息來源： 液位變送器設(shè)計 | 2020-09-30 點擊量： 4915 |
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1、選擇恰當(dāng)?shù)奈恢茫寒?dāng)?shù)陌惭b位置過于靠近生產(chǎn)線上游的時候，未熔融的物料就會磨損到傳感器的頂部。一般來說，傳感器可以位于濾網(wǎng)前面的機筒上、熔體泵的前后或者模具中，首先在管道中安裝節(jié)流裝置，流體通過時，在其前后造成差壓，而差壓與流量有一定關(guān)系，用差壓變送器測量出差壓，也就得到了流量的測量值。
1. Choose the right location: when the installation position is too close to the upstream of the production line, the unmelted material will wear to the top of the sensor. Generally speaking, the sensor can be located on the barrel in front of the filter screen, in the front and rear of the melt pump or in the mold. First of all, a throttling device is installed in the pipeline. When the fluid passes through, the differential pressure will cause a differential pressure between the front and the rear. The differential pressure has a certain relationship with the flow rate. If the differential pressure is measured by the differential pressure transmitter, the flow measurement value can be obtained.
3151/3051插入筒式液位變送器儀表維護(hù)易忽視哪六個因素
Which six factors are easy to ignore in the maintenance of 3151 / 3051 plug-in barrel level transmitter
2、檢查安裝孔尺寸的大?。喊惭b孔的尺寸大小不合適，差壓變送器在安裝的過程中，只有合適的安裝孔才能夠避免螺紋的磨損，通常我們可以采用安裝孔測量儀對安裝孔進(jìn)行精細(xì)的檢測，以做出適當(dāng)?shù)恼{(diào)整。測量兩點之間的壓力差。如測量塔設(shè)備、管道中某兩點之間的壓力差或兩點之間的阻力損失。
2. Check the size of the mounting hole: the size of the mounting hole is not appropriate. During the installation of the differential pressure transmitter, only the appropriate mounting hole can avoid the wear of the thread. Generally, we can use the installation hole measuring instrument to carry out fine detection of the installation hole, so as to make appropriate adjustment. Measure the pressure difference between two points. Such as measuring tower equipment, the pressure difference between two points in the pipeline or resistance loss between two points.
3、避免低溫干擾：在擠出生產(chǎn)過程中，如果擠出機在開始進(jìn)行生產(chǎn)前還沒有達(dá)到操作溫度，那么傳感器和擠出機都會受到一定程度的損壞。在拆除之前，應(yīng)確認(rèn)機筒的溫度足夠高，機筒內(nèi)部的物料處于軟化狀態(tài)下。經(jīng)過適當(dāng)?shù)挠嬎?，差壓變送器還可用來測量液體的分界面。
3. Avoid low temperature interference: in the process of extrusion production, if the extruder has not reached the operating temperature before the start of production, the sensor and extruder will be damaged to a certain extent. Before removal, it should be confirmed that the temperature of the barrel is high enough and the material inside the barrel is in a softening state. After proper calculation, the differential pressure transmitter can also be used to measure the liquid interface.
4、保持干燥：盡管的電路設(shè)計是能夠經(jīng)得起苛刻的擠出加工環(huán)境，但是多數(shù)傳感器也不能防水，在潮濕的環(huán)境下也不利于正常運行。就要選擇具有極強防水性的特殊傳感器。測量液體的重度。當(dāng)液面高度H恒定時，用差壓變送器測出差壓AP的大小，就可以求得液體的重度T。
4. Keep dry: Although the circuit design is able to withstand harsh extrusion processing environment, but most sensors are not waterproof, in wet environment is not conducive to normal operation. It is necessary to select a special sensor with strong water resistance. Measure the gravity of the liquid. When the liquid level height h is constant, the differential pressure transmitter is used to measure the differential pressure AP, and then the liquid gravity t can be obtained.
5、要保持安裝孔的清潔：保持安裝孔的清潔主要還是為了防止熔料堵塞，對于保證設(shè)備的正常運行是極為重要的。在擠出機被清潔之前，所有的壓力傳感器都應(yīng)該從機筒上拆除以避免損壞。如果這種情況發(fā)生，就應(yīng)當(dāng)采取措施來升高傳感器在安裝孔中的位置。在沒有專用的壓力或真空儀表時，在一定條件下，可用差壓變送器測量壓力(負(fù)壓測通大氣)和測量真空度(正壓測通大氣)
5. To keep the installation hole clean: to keep the installation hole clean is mainly to prevent the melting material from blocking, which is very important to ensure the normal operation of the equipment. Before the extruder is cleaned, all pressure sensors should be removed from the barrel to avoid damage. If this happens, measures should be taken to raise the position of the sensor in the mounting hole. When there is no special pressure or vacuum instrument, under certain conditions, differential pressure transmitter can be used to measure pressure (negative pressure to measure atmosphere) and vacuum degree (positive pressure to measure atmosphere)
6、認(rèn)真全面清潔：在使用鋼絲刷或特殊化合物對擠出機的機筒進(jìn)行清潔之前，應(yīng)該將所有的差壓變送器都拆卸下來。當(dāng)機筒被加熱時，也應(yīng)該將傳感器拆卸下來并使用不會產(chǎn)生磨損的軟布來擦拭其頂部，同時傳感器的孔洞也需要用清潔的鉆孔機和導(dǎo)套清理干凈。
6. Careful and comprehensive cleaning: before cleaning the barrel of extruder with wire brush or special compound, all differential pressure transmitters should be removed. When the barrel is heated, the sensor should also be removed and the top of the sensor should be wiped with a soft cloth that will not cause wear. At the same time, the hole of the sensor needs to be cleaned with a clean drill and guide sleeve.
3151/3051插入筒式液位變送器儀表維護(hù)易忽視哪六個因素
Which six factors are easy to ignore in the maintenance of 3151 / 3051 plug-in barrel level transmitter
與節(jié)流裝置配合使用測量流量。增加適當(dāng)?shù)妮o助裝置后，可以對設(shè)備或部件的上升高度進(jìn)行測量，如測量氣柜鐘罩上升的高度，
Use with throttling device to measure flow. After adding appropriate auxiliary devices, the rising height of equipment or components can be measured, such as measuring the rising height of gas holder bell cover,
設(shè)計人員必須考慮眾多不同設(shè)計要求，包括精度、零漂移、溫度和靜態(tài)壓力補償。
Designers must consider many different design requirements, including accuracy, zero drift, temperature and static pressure compensation.
l 除了差分壓力信號，必須考慮通過溫度和靜態(tài)壓力信號進(jìn)行特性補償。
In addition to differential pressure signals, characteristic compensation by temperature and static pressure signals must be considered.
l 預(yù)防性維修可檢測傳感器老化或任何異常。
L preventive maintenance can detect sensor aging or any abnormality.
l 壓力變送器產(chǎn)品的最大量程比可達(dá)200:1，量程上限甚至可達(dá)15,000 psi。
The maximum range ratio of pressure transmitter can reach 200:1, and the upper range can even reach 15000 psi.
l 測量精度最高可以達(dá)到滿量程范圍的0.04%，通常需要16至24位的模數(shù)轉(zhuǎn)換器。
The measurement accuracy can reach up to 0.04% of the full scale range, and usually requires a 16 to 24 bit analog-to-digital converter.
l 與不同現(xiàn)場總線的連接，例如HART、PROFIBUS、Modbus、foundation、RS-485/RS-422/RS-232、無線HART等。
L connection with different fieldbus, such as Hart, PROFIBUS, MODBUS, foundation, RS-485 / RS-422 / RS-232, wireless Hart, etc.
l 傳感器、調(diào)理電路、系統(tǒng)電源、通信和I/O之間可能需要隔離；隔離等級從1kV到2.5kV不等。
L isolation may be required between sensors, conditioning circuits, system power, communications and I / O; isolation levels range from 1kV to 2.5KV.
l 采用電池和環(huán)路供電的差分壓力變送器需要精心選擇的超低功耗元件，例如調(diào)理芯片、MCU等。
The differential pressure transmitter with battery and loop power supply needs carefully selected ultra-low power consumption components, such as conditioning chip, MCU, etc.
3151/3051插入筒式液位變送器儀表維護(hù)易忽視哪六個因素
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