NNF-212型核辐射密度计,测量范围:12～65 g/cm~2(密度P×直径d);测量误差:±0.015 g/cm~3(管径>φ150 mm);±0.03 g/cm~3(管径φ70～150 mm)。由测量范围和测量误差可以看出,选择合适的被测管径,关系着仪表是否能够使用。假定被测物的密度为1～2g/cm~3,则符合测量范围的臂径为φ12～32.5cm。由于密度计可以连续测量液态、固体及液固混合物的密度,并且测量时不与被测对象接触,因此在化工系统、石油系统、冶金系统获得广泛的应用。各种不同的使用场合,被测管径亦不相同,这样就存在一个如何安装的问题。 1.若被测管径比密度计测量范围所要求的管径小,可以采用以下几种方法:(1)斜线安装法;(2)局部扩大 Measurement range: 12 ~ 65 g / cm ~ 2 (density P × diameter d); Measurement error: ± 0.015 g / cm ~ 3; Diameter: φ150 mm; ± 0.03 g / cm ~ 3 (diameter φ70 ~ 150 mm). From the measurement range and measurement error can be seen, select the appropriate diameter measured, the instrument is able to use. Assuming that the density of the measured object is 1 ~ 2g / cm ~ 3, the arm diameter that meets the measurement range is φ12 ~ 32.5cm. As the density meter can continuously measure the liquid, solid and liquid-solid mixture density, and the measurement does not come into contact with the measured object, it has been widely used in chemical systems, petroleum systems and metallurgical systems. A variety of different occasions, the measured diameter is not the same, so there is a problem how to install. 1. If the measured diameter than the densitometer diameter range required by the small diameter, you can use the following methods: (1) oblique installation; (2) local expansion