3151/3051插入筒式液位变送器仪表维护易忽视哪六个因素压力仪表制造厂家
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3151/3051插入筒式液位变送器仪表维护易忽视哪六个因素
信息来源: 液位变送器设计 | 2020-09-30 点击量: 266

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1、选择恰当的位置:当的安装位置过于靠近生产线上游的时候,未熔融的物料就会磨损到传感器的顶部。一般来说,传感器可以位于滤网前面的机筒上、熔体泵的前后或者模具中,首先在管道中安装节流装置,流体通过时,在其前后造成差压,而差压与流量有一定关系,用差压变送器测量出差压,也就得到了流量的测量值。
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插入筒式液位变送器仪表维护易忽视哪六个因素
Which six factors are easy to ignore in the maintenance of 3151 / 3051 plug-in barrel level transmitter
2、检查安装孔尺寸的大小:安装孔的尺寸大小不合适,差压变送器在安装的过程中,只有合适的安装孔才能够避免螺纹的磨损,通常我们可以采用安装孔测量仪对安装孔进行精细的检测,以做出适当的调整。测量两点之间的压力差。如测量塔设备、管道中某两点之间的压力差或两点之间的阻力损失。
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、避免低温干扰:在挤出生产过程中,如果挤出机在开始进行生产前还没有达到操作温度,那么传感器和挤出机都会受到一定程度的损坏。在拆除之前,应确认机筒的温度足够高,机筒内部的物料处于软化状态下。经过适当的计算,差压变送器还可用来测量液体的分界面。
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:尽管的电路设计是能够经得起苛刻的挤出加工环境,但是多数传感器也不能防水,在潮湿的环境下也不利于正常运行。就要选择具有极强防水性的特殊传感器。测量液体的重度。当液面高度H恒定时,用差压变送器测出差压AP的大小,就可以求得液体的重度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、要保持安装孔的清洁:保持安装孔的清洁主要还是为了防止熔料堵塞,对于保证设备的正常运行是极为重要的。在挤出机被清洁之前,所有的压力传感器都应该从机筒上拆除以避免损坏。如果这种情况发生,就应当采取措施来升高传感器在安装孔中的位置。在没有专用的压力或真空仪表时,在一定条件下,可用差压变送器测量压力(负压测通大气)和测量真空度(正压测通大气)
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、认真全面清洁:在使用钢丝刷或特殊化合物对挤出机的机筒进行清洁之前,应该将所有的差压变送器都拆卸下来。当机筒被加热时,也应该将传感器拆卸下来并使用不会产生磨损的软布来擦拭其顶部,同时传感器的孔洞也需要用清洁的钻孔机和导套清理干净。
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插入筒式液位变送器仪表维护易忽视哪六个因素
Which six factors are easy to ignore in the maintenance of 3151 / 3051 plug-in barrel level transmitter
与节流装置配合使用测量流量。增加适当的辅助装置后,可以对设备或部件的上升高度进行测量,如测量气柜钟罩上升的高度,
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,
设计人员必须考虑众多不同设计要求,包括精度、零漂移、温度和静态压力补偿。
Designers must consider many different design requirements, including accuracy, zero drift, temperature and static pressure compensation.
l  除了差分压力信号,必须考虑通过温度和静态压力信号进行特性补偿。
In addition to differential pressure signals, characteristic compensation by temperature and static pressure signals must be considered.
l  预防性维修可检测传感器老化或任何异常。
L preventive maintenance can detect sensor aging or any abnormality.
l  压力变送器产品的最大量程比可达200:1,量程上限甚至可达15,000 psi。
The maximum range ratio of pressure transmitter can reach 200:1, and the upper range can even reach 15000 psi.
l  测量精度最高可以达到满量程范围的0.04%,通常需要16至24位的模数转换器。
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  与不同现场总线的连接,例如HART、PROFIBUS、Modbus、foundation、RS-485/RS-422/RS-232、无线HART等。
L connection with different fieldbus, such as Hart, PROFIBUS, MODBUS, foundation, RS-485 / RS-422 / RS-232, wireless Hart, etc.
l  传感器、调理电路、系统电源、通信和I/O之间可能需要隔离;隔离等级从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  采用电池和环路供电的差分压力变送器需要精心选择的超低功耗元件,例如调理芯片、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插入筒式液位变送器仪表维护易忽视哪六个因素
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