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| Selection of level instruments |
| 2011-11-11 14:51:13 |
物位包括液位、界位和料位.物位检侧仪表种类繁多、性能各异， 各不相同 。 In general , the level includes the liquid level, the boundary level and the material level. There are many types of level-checking instruments with different performances . Therefore, it is necessary to comprehensively synthesize the characteristics of the subject, process measurement requirements, and cost-effective selection. 物位仪表 的选用： The following describes the selection of level instruments from three aspects :
I. Selection of instrument model
The type of meter determines the nature of the meter. 被侧对象的特点， 可能是 检侧液位、 可能是 检测料位或界位；检测密闭容器中的物位还是敞口容器中的物位;是否需要克服液体的泡沫所造成的假液位的影响;以及接触介质的压力、温度、粘度、腐蚀性、稳定性如何。 Due to the characteristics of the object being tested , it may be the liquid level of the side, the level of the material or the boundary; the level of the sealed container or the level of the open container; whether the false liquid caused by the foam of the liquid needs to be overcome The influence of the position; and the pressure, temperature, viscosity, corrosiveness and stability of the contact medium. 仪表的安装高度及仪表使用环境的防爆等级、干扰程度等。 Also pay attention to the installation height of the instrument and the explosion-proof level and interference level of the environment in which the instrument is used.
2. Selection of measurement range
根据工艺测量要求选用仪表测量范围。 The measurement range is very important. Be sure to select the instrument measurement range according to the process measurement requirements.
等 级的选用 3. Selection of accuracy level
Determine the accuracy level of the instrument according to the maximum absolute error allowed by the process production.
For the level and interface measurement of most process objects, a differential pressure level gauge, a sink level gauge or a float level gauge can be used to meet the requirements. If it is not satisfied, you can choose radar level gauge , capacitance type, resistance type , nuclear radiation type and other level detection instruments.