，是一类比较常见的仪器 。 Pressure instruments are measuring instruments and are widely used in various fields . They are a relatively common type of instrument . 观 察产品或 者 介质流程中的条件形成，监视生产运行过程中的安全动向，并通过自动连锁或 者 传感装置，构 成 了一道迅速可靠的安全保障，为防范事故、保障人身和财产安全发挥了重要作用，被称作安全的“ 眼睛 ” 。 It can intuitively show the pressure change in each process link, observe the formation of conditions in the product or medium process, monitor the safety trend in the production and operation process, and form a fast and reliable through automatic interlocking or sensor devices. The safety guarantee has played an important role in preventing accidents and ensuring the safety of people and property. It is called the " eye " of safety .
压力表 的 表盘上刻度极限值应 该 与设备的工作压力相适应。 1. The pressure gauge with the range installed on the boiler and pressure vessel, and the scale limit value on the dial of the pressure gauge should be compatible with the working pressure of the equipment. 为 工作压力的1 ． The range of the pressure gauge is generally 1% of the working pressure . 5 to 3 times, preferably 2 times. 1 ） 如果 选用的压力表量程过大，由于同样精度的压力表，量程越大，允许误差的绝对值和肉眼观察的偏差就越大，则会影响压力读数的准确性； （ 2 ） 反之， 如果 选用的压力表量程过小，设备的工作压力等于或 者 接近压力表的刻度极限，则会使压力表中的弹性元件长期处于最大的变形状态， 容 易产生永久变形，引起压力表的误差增大和使用寿命降低。 ( 1 ) If the range of the selected pressure gauge is too large, the larger the range of the pressure gauge with the same accuracy, the greater the deviation between the absolute value of the allowable error and the naked eye will affect the accuracy of the pressure reading; ( 2 ) otherwise If the range of the selected pressure gauge is too small, and the working pressure of the device is equal to or close to the scale limit of the pressure gauge, the elastic elements in the pressure gauge will be in the maximum deformation state for a long time, which is prone to permanent deformation and cause Increased error and reduced life. 3 ） 除此之外 ，压力表的量程过小，万一超压运行，指针越过最大量程接近零位， 从 而使操作人员产生错觉，造成更大的事故。 ( 3 ) In addition , the range of the pressure gauge is too small. In case of overpressure operation, the pointer will approach the zero position beyond the maximum range, which will cause the operator to have an illusion and cause a greater accident. ； Therefore, the operating pressure range of the pressure gauge should not exceed 60 to 70 % of the scale limit ;
2. The accuracy of the working pressure gauge is expressed as the percentage of the allowable error in the dial scale limit. ； The accuracy level is generally marked on the dial. When selecting a pressure gauge, the accuracy should be determined according to the pressure level of the equipment and the actual work needs ;
、压力表用于测量的介质如果有腐蚀性，那么一定要根据腐蚀性介质的具体温度、浓度等参数来选用不同的弹性元件材料，否则达不到预期的目的 ； 3. If the medium used by the pressure gauge for measurement is corrosive, then different elastic element materials must be selected according to the specific temperature, concentration and other parameters of the corrosive medium, otherwise the intended purpose cannot be achieved ;
、表盘直径为了使操作人员能准确地看清压力值， 压力表的表盘直径不应 该 过小，如果压力表装得较高或 者 离岗位较远，表盘直径应 该 增大 ； 4. Dial diameter In order for the operator to see the pressure value accurately, the dial diameter of the pressure gauge should not be too small. If the pressure gauge is installed higher or farther from the post, the diameter of the dial should be increased ;
应 重视使用维护，定期进行检查、清洗并做好使用情况记录 ； 5. Everyday should pay attention to the use and maintenance, regularly check, clean and keep a record of usage ;
每 半年检定 一次 。 6 , the pressure gauge is generally verified every six months . Mandatory verification is a legal measure to ensure the reliable technical performance of pressure gauges, accurate transmission of values, and effective guarantee of safe production.