⎝⎛星力捕鱼⎞⎠

⎝⎛星力捕鱼⎞⎠ page Company Profile ⎝⎛星力捕鱼⎞⎠ Product center Quality system marketing network After sales service Recruitment contact us
Flow meter series
Temperature instrument series
Pressure instrument series
Calibration instrument series
Level instrument series
Digital display instrument series
Transmitter instrument series
Wire and cable series
Bridge instrument cabinet series
Pipe fitting valve series

Address: Xiongyi, Jinhe Road, Jinhu County, Jiangsu Province
Lunan
Phone: 0517-86900901
0517-86900921
0517-86900920
Fax: 0517-86900902
Postcode: 211600
http://zzyfwh.com
Email: chinadongxiang@163.com
Industry Information
Knowledge about the accuracy of pointer pressure gauges
2011-9-13 9:18:50

 
First, the effect of temperature
测压是 指在 压力的作用 使得弹簧弯管变形。 The pressure measurement of the pointer pressure gauge refers to the deformation of the spring elbow under the effect of pressure . 高, 那么 温度的作用 容易 使得弯管变形。 If the temperature of the medium entering the spring elbow is too high , the temperature will easily deform the elbow. 如果 高温介质长期作用于弹簧弯管 这样 会使弯管产生永久变形。 And if the high-temperature medium acts on the spring elbow for a long time , it will cause permanent deformation of the elbow. 对测量产生不 好的 影响。 Therefore, it has a bad influence on the measurement .
   的办法 :在 压力表与锅筒之间, 装不同形式的存水弯管,用以积存凝结水, 阻止蒸汽直接进入弹簧弯管内。 Solution : Install a different type of water storage elbow between the pressure gauge and the pot to store the condensate and prevent steam from directly entering the spring elbow.
The effect of freezing and vibration
受外界条件影响 较大。 The pointer pressure gauge is installed outside the boiler and is greatly affected by external conditions . 过低 冰冻或 来自锅炉 自身 及压力表内部的各种振动,都会对压力表指针的灵敏度 及准确度产生影响。 If the external temperature is too low , freezing or various vibrations from the boiler itself and the pressure gauge will affect the sensitivity and accuracy of the pressure gauge pointer .
   的办法:1.进行加装保温 装置;2.安装缓冲 装置, 如三通旋塞就是一种防震装置。 Solution : 1. Install thermal insulation device; 2. Install buffer device, such as three-way cock is a kind of shockproof device.
Third, the impact of overload
游丝等弹性部件,如 经常处于极限或 接近于极限 状态. The elastic parts such as spring bends and hairsprings in the pointer pressure gauge are often in the limit state or near the limit state. 长时 工作会导致弹性的减弱或 丧失,甚至 发生 永久变形。 After a long period of work, the elasticity will be weakened or lost, and even permanent deformation will occur . 大于表盘满刻度的2 3 的位置,对压力表的长期工作 是不利的。 If the pressure gauge pointer is often near or larger than 2/3 of the full scale of the dial , the long-term operation of the pressure gauge is also unfavorable.
   的办法 首先 选用压力表 ,量程要选得合理,以工作压力处于量程的1 2 为最佳 其次要严格防止锅炉超压运行。 The solution : First, when selecting the pressure gauge , the range should be selected reasonably, and the working pressure is 1/2 of the range is the best ; second, the boiler should be strictly prevented from overpressure operation.