未核实，仅供参考Pressure gauge refers to elastic element as the sensitive element, measure and instructions above environmental pressure meter, application is very common, it almost throughout all of the industrial process and research fields. In the heat pipe network, oil and gas transmission, water supply, gas supply system, vehicle maintenance shop, etc can be seen everywher. Especially in the process of industrial process control and technology measure, due to the flexibility of mechanical pressure gauge sensor has high mechanical strength and production is convenient wait for a characteristic, make the mechanical pressure gauge is widely used.
压力表的选用应根据使用工艺生产要求，针对具体情况做具体分析。在满足工艺要求的前提下，应本着节约的原则全面综合地考虑，一般应考虑以下几个方面的问题：
The selecion of pressure gauge should be used according to process requirements, do a concrete analysis on the specific circumstances. On the premise of meet the technological requirements, should be based on the principle of saving synthetically consider comprehensively, generally should consider the following issues:
1、类型的选用the selection of type
仪表类型的选用必须满足工艺生产的要求。例如是否需要远传、自动记录或报警；被侧介质的性质（如被测介质的温度高低、粘度大小、腐蚀性、脏污程度、是否易燃易爆等）是否对仪表提出特殊要求，现场环境条件（如湿度、温度、磁场强度、振动等）对仪表类型的要求等。因此根据工艺要求正确地选用仪表类型是保证仪表正常工作及安全生产的重要前提。
Instrument type selection must meet the requirements of the process. Whether you need such as remote transmission, automatic recording, or the police; The nature of the medium to be side (such as the temperature of the measured medium size, viscosity, corrosion, smudgy degree, whether the flammable and explosive, etc.) is put forward special requirements for instrument, on-site environmental conditions (such as humidity, temperature, magnetic field intensity, vibration, etc.) for instrument types of requirements, etc. Therefore correctly chosen instrument types according to the technical requirement is to guarantee the normal work of the instrument and the important premise of safety in production.
例如普通压力表的弹簧管多采用铜合金（高压的采用合金钢），而氨用压力表弹簧管的材料却都采用碳钢（或者不锈钢），不允许采用铜合金。因为氨与铜产生化学反应，会爆炸，所以普通压力表不能用于氨压力测量。
Such as normal pressure gauge of the spring tubes with copper alloy using alloy steel (high voltage), and ammonia pressure gauges spring tube materials are using carbon steel or stainless steel, are not allowed to use copper alloy. Because of ammonia and copper to produce chemical reaction, will explode, so general pressure gauges cannot be used for ammonia pressure measurement.
氧气压力表与普通压力表在结构和材质方面可以完全一样，只是氧用压力表必须禁油。因为油进人氧气系统易引起爆炸。所用氧气压力表在校验时，不能像普通压力表那样采用油作为工作介质，并且氧气压力表在存放中要严格避免接触油污。如果必须采用现有的带油污的压力表测量氧气压力时，使用前必须用四氯化碳反复清洗，认真检查直到无油污时为止。
Oxygen pressure gauge with normal pressure gauge in the aspect of structure and material can be exactly the same, just oxygen with oil pressure gauge must be forbidden. Because oil into oxygen system easy cause explosion. The oxygen pressure gauge used in calibration, not like ordinary pressure gauge using oil as working medium, and the oxygen pressure gauge to strictly avoid contact with oil in the store. If must use of existing oil pressure gauge to measure the oxygen pressure, must be cleaned with carbon tetrachloride repeatedly before use, carefully check until there is no oil.
2、测量范围的确定The determination of measuring range
为了保证弹性元件能在弹性变形的安全范围内可靠地工作，在选择压力表量程时，必须根据被测压力的大小和压力变化的快慢，留有足够的余地，因此，压力表的上限值应该高于工艺生产中可能的*大压力值。根据“化工自控设计技术规定”，在测量稳定压力时，*大工作压力不应超过测量上限值的2/3；测量脉动压力时，*大工作压力不应超过测量上限值的1/2；测量高压时，*大工作压力不应超过测量上限值的3/5。一般被测压力的*小值应不低于仪表测量上限值的1/3。从而保证仪表的输出量与输人量之间的线性关系
In order to keep the elastic component can work reliably within the scope of the safety of the elastic deformation, when selecting range, must according to the size of the measured pressure and the pressure change of speed, enough leeway, therefore, the upper limit of pressure gauge should be higher than the process in the production of possible maximum pressure value. According to the chemical control design technical regulation ", in the measurement stability, the maximum working pressure shall not exceed 2/3 of the upper limit value of the measurement. Measuring pulse pressure, the maximum working pressure shall not exceed the upper limit value of the measured 1/2; When measuring high pressure, the maximum working pressure shall not exceed 3/5 of the upper limit value of the measurement. General minimum values measured pressure shall be not less than 1/3 of the upper limit value of the instrument measurement. To ensure the instrument of a linear relationship between output and input quantity
根据被测参数的*大值和*小值计算出仪表的上、下限后、不能以此数值直接作为仪表的测量范围。我们在选用仪表的标尺上限值时，应在国家规定的标准系列中选取。中国的压力表测量范围标准系列有：-0.1-0.06,0.15;0-1,1.6,2.5,4,6,1010" MPa（其中n为自然整数.可为正、负值）。
According to the measured parameters of the maximum and the minimum calculated instrument on, after the floor, do not value directly as a instrument of measuring range. We when choosing instrument on the scale of limit, should be selected in the regulations of the state, the standard series. Pressure gauge measuring range of the standard series are: China - 0.1-0.1, 0.15; ,1.6 0-1, 2.5, 4,6,10 X10 "MPa (wher n is integer nature. Can be positive and negative).
3、精度等级的选取The selection of precision grade
根据工艺生产允许的*大绝对误差和选定的仪表*程、计算出仪表允许的*大引用误差，在国家规定的精度等级中确定仪表的精度。一般来说，所选用的仪表越精密，则测量结果越精确、可靠。但不能认为选用的仪表精度越高越好，因为越精密的仪表一般价格越贵，操作和维护越费事。
According to the process to allow maximum absolute error and the selected instrument most cheng, calculate the instrument allows the maximum error of the reference, in the regulations of the state, the accuracy grade of determine the accuracy of the instrument. In general, chooses the precision instrument, measurement results are more accurate and reliable. But cannot think of chosen instrument accuracy is higher, the better, because the precision of the instrument in general, the more expensive, operation and maintenance, the more trouble.
选用举例Choose, for example：
1、用于测量黏稠或酸碱等特殊介质时，应选用隔膜压力表、不锈钢弹簧管、不锈钢机 芯、不锈钢外壳或胶木外壳.按其所测介质不同，在压力表上应有规定的色标，并注明特殊介质的名称，氧气表必须标以红色“禁油”字样，氢气用深绿色下横线色标，氨用黄色下横线色标等等。
1, used for measuring the viscous or the special medium such as acid and alkali, should choose the diaphragm pressure gauge, stainless steel spring tube, stainless steel, stainless steel machine core shell or bakelite shell. According to the measured medium is different, on the pressure gauge shall be stipulated by the color scale, and indicate the name of the special medium, oxygen gauge must be marked in red word "oil" ban, hydrogen with a horizontal line under the dark green color, color scale ammonia under the yellow line, and so on.
2、靠墙安装时，应选用有边缘的压力表；直接安装于管道上时，应选用无边缘的压力表；用于直接测量气体时，应选用表壳后面有安全孔的压力表。出于测压位置和便于观察管理的考虑，应选择表壳直径的大小。
2, when installation, against the wall should be chosen on the edge of the pressure gauge; Directly installed on the pipeline, should choose without the edge of the pressure gauge; When used for direct measurement of gas, should choose watchcase behind a security hole pressure gauge. For reasons of pressure management position and convenient for observation, should choose the size of the casing diameter.
3使用注意Use attention
1、仪表必须垂直：安装时应使用17mm扳手旋紧，不应强扭表壳；运输时应避免碰撞；
1, the instrument must be installed vertically: 17 mm should be used when the wrench to tighten, should not be strong torsional case; Transportation should avoid collision;
2、仪表使用宜在周围环境温度为-25~55℃；
2, instrument using appropriate at ambient temperature is 25 ~ 55 ℃;
3、使用工作环境振动频率<25HZ，振幅不大于1mm；
3, the use of the work environment vibration frequency < 25 hz, the amplitude is not more than 1 mm;
4、使用中因环境温度过高，仪表指示值不回零位或出现示值超差，可将表壳上部密封橡胶塞剪开，使仪表内腔与大气相通即可；
4, used by environmental temperature, indicating value of the instrument is not back to zero or appear, indicating error can cut open upper case sealing rubber plug, make the instrument lumen and atmosphere are interlinked;
5、仪表使用范围，应在上限的1/3～2/3之间；
5, instrument using range, should be between 1/3 to 2/3 of the ceiling;
6、在测量腐蚀性介质、可能结晶的介质、粘度较大的介质应加隔离装置；
6, in the measurement of corrosive medium, may the crystallization medium, the viscosity larger medium should add isolation device;
7、仪表应经常进行检定（至少每三个月一次），如发现故障应及时修理；
7, instrument should be regular check (at least once every three months), if discover fault shall promptly repair;
8、仪表自出厂之日起，半年内若在正常保管使用条件下发现因制造质量不良失效或损坏时，由该公司负责修理或调换；
8, instrument from the date of delivery, if half a year under normal storage conditions of use found failure or damage due to poor quality, by the company responsible for repair or exchange;
9、需用测量腐蚀性介质的仪表，在订货时应注明要求条件。
9, need measuring instrument of corrosive medium, should indicate the requirement when ordering.
工作原理The working principle of
压力表通过表内的敏感元件（波登管、膜盒、波纹管）的弹性形变，再由表内机芯的转换机构将压力形变传导至指针，引起指针转动来显示压力。
Pressure gauge by sensitive element within the table (bourdon tubes, bellows, bellows) of elastic deformation, again by the transformation mechanism of movement in table will pressure deformation to a pointer, pointer rotation to display the pressure.
主要构造The main structure
溢流孔：若发生波登管爆裂的紧急情况的时候，内部压力将通过溢流孔向外界释放，防止玻璃面板的爆裂。注：为了保持溢流孔的正常性能，需在表后面留出至少10mm的空间，不能改造或塞住溢流孔。
The overflow hole: if produce bourdon tube burst of emergencies, internal pressure to release through the overflow hole to the outside world, to prevent the glass panel burst. Note: in order to maintain the normal performance of the overflow hole, need to be at the back of the table to set aside at least 10 mm space, they cannot transform or overflow weir.
指针：除标准指针外，其他指针也是可选的。
Pointer: in addition to the standard pointer, other pointer is optional.
玻璃面板：除标准玻璃外，其他特殊材质玻璃，如强化玻璃，无反射玻璃也是可选的。
Glass panel: in addition to the standard glass, other special glass, such as tempered glass, reflective glass is optional.
性能分类：普通型（标准）、蒸汽用普通型（M）、耐热型（H）、耐振型（V）、蒸汽用耐振型（MV）耐热耐振型（HV）。
Performance classification: regular (standard), steam with ordinary (M), heat resistant type (H), resistance to vibration mode (V), steam with vibration mode (MV) heat resistant to vibration mode (HV).
处理方式：禁油/禁水处理 在制造时除去残留在接液部的水或油。
Abstain handling: oil/water treatment When manufacturing to remove residues in the liquid of water or oil.
外装指定：壳体颜色除标准色以外，需特别注明。
A specified: outside shell color in addition to the standard color, must be specified.
节流阀（可选）：为了减小脉动压力，节流阀安装在压力入口处。
Throttle valve (optional) : in order to reduce the fluctuating pressure, throttle valve is installed in the entrance pressure.
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