Bartec Benke designs and manufactures analytical instruments for gases and liquids in the petrochemical industry. In order to track product quality during the manufacturing process and also to conform to product specifications, for products such as diesel, paraffin, kerosene, benzene, heating oil, Naphtha and hydrocarbons, measuring solutions are utilized to ascertain the boiling point, flash point, cloud point, vapour pressure and solidification.
测量要求
In order to ensure precise analysis, there must be continuous flow of samples into the analysers. Standard flow volumes for these types of applications are in the range of 2 to 40l/h. The products may have high viscosity rates of up to 40 cSt (centistokes) and have little or no electric conductivity. Bartec Benke often employs可变区域流量计for sample processing systems, process analysers and turnkey analszer cabinets.
克罗恩Solution
Krohne的DK 32可变区域流量计were used to determine the continuous flow of sample. These systems do not require any power supply. By means of the local display and the built-in needle valve, the preferred flow rate can be directly set through the DK 32 measuring instruments. To detect blockages and leaks in the sample line, reduced flow monitoring using limit switches is carried out for continuous process analysers. Figure 1 shows the cloud point analyser.
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Figure 1.云点分析仪
The variable area flow measuring principle is applied for the actual sample flows of 2…40l/h, and as well as for instrument air (800…1400 Nl/h), inert gas (0.5…5 Nl/h), and cooling water (20…60l/h).
工作原理
Theflowmeterfunctions on the float measuring principle. The measuring segment includes a metal cone, wherein a float can easily move up and down. The medium flows via theflowmeter从底部到顶部。浮子能够修改自身，以使形式阻力W，其重量G和浮力A作用在其上以完美的平衡：G = A +W。
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Figure 2.Operating principle
In case of theDK32, DK34 and DK37/M8M devices(Figure 2, left image), the flow-dependent height of the float in the measuring segment is relayed through a magnetic coupling and shown on a scale. For theDK37/M8E（图2，右图像），通过传感器S1和S2上的磁耦合将测量段中浮子的流量依赖性高度继电器。
Low-Cost Alternative
克罗恩’s DK 32low-flow measuring instruments provide a low-cost alternative and are capable of measuring with adequate precision at a maximum permissible error of 4% of the calculated value. However, more than the precision, the consistency and repeatability of the flow are important.
The built-inneedle valvesaves time on planning and deploying extra valves. Given that the measuring principle can be employed for both gases and liquids, the same kind of device is utilized for both the auxiliary fluids and the sample flows. This not only improves familiarity with the measuring instruments, but also streamlines operation. Also, electric power supply and inlet and outlet runs are not required, making it easy to install and integrate the systems.
TheDK 32 measuring deviceis approved for use in adverse environments according to IECEx, ATEX, NEPSI and FM standards. This means, the devices can be utilized in analyser equipment.
DK的好处32可变面积流量计
Krohne的DK 32可变面积流量计（图3）提供以下好处：
- Measurement of viscous products sans electric conductivity
- 气态和液体产物的低流量的一致测量和给药
- Local measured value display sans power supply
- 没有进口和出口的空间安装
- Optional limit switches for monitoring
- Certification for hazardous areas in accordance with IECEx, ATEX, NEPSI and FM standards
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Figure 3.DK 32 variable area flowmeter
结论
克罗恩offers a wide range of variable area流量计这可以有效地用于检测石油化学行业过程分析仪的泄漏和阻塞。这些设备带有内置的针阀，可以准确地给出样品流量并简化整个安装和集成过程
About KROHNE Messtechnik GmbH
克罗恩是世界领先的制造商和工业过程仪器解决方案的供应商。
克罗恩为一站式购物和工业提供支持的产品和服务，例如石油和天然气，水和废水，化学和石化，食品和饮料，动力，矿物质和矿物质和海洋。
This information has been sourced, reviewed and adapted from materials provided by KROHNE Messtechnik GmbH.
有关此消息来源的更多信息，请访问Krohne Messtechnik GmbH。