Category:Instrument

Question:
thermometer, pressure gauge and pressure What is the difference ah?

Answer:
thermometer, pressure gauge and pressure is the difference: the former is used to pressure measuring instrument, which is the use of pressure and temperature using the correlation between changes in pressure-sensitive element, said high and low temperature. First deal with pressure gauge, here first to introduce a few definitions:
1, pressure:
we usually refer to the pressure, the pressure is actually physics, namely, pressure on the unit area size.
2, absolute pressure: an absolute pressure of zero as a benchmark to measure the pressure way.
3, pressure: The atmospheric pressure as the benchmark, indicating the pressure above atmospheric pressure.
4, negative pressure (vacuum): The atmospheric pressure as the benchmark, indicating the pressure below the atmospheric pressure.
5, pressure: the pressure difference between the two.
6, gauge pressure: The atmospheric pressure as the benchmark, showing greater than or less than atmospheric pressure pressure.
7, Pressure Gauge: The atmospheric pressure as the benchmark instrument for measuring atmospheric pressure.
in actual use, due to the flexibility of mechanical pressure gauge sensing element with high mechanical strength and the production of convenient features, and thus widely used.
mechanical pressure gauge in the elastic sensing element with the pressure changes resulting from elastic deformation. Elastic sensing element with spring-tube (Bourdon tube), diaphragm, membrane form of boxes and corrugated pipe. The measured pressure relative pressure. Based on atmospheric pressure as the base of the relative pressure. Elastic components in the medium produce elastic deformation under pressure, through the pressure gauge gear transmission amplification pass pointer, gauge will show the relative value relative to atmospheric pressure.
Each has its own pressure gauge measuring range, measuring the pressure within the value from the pointer shows the direction dial the scope of the general作成convenient 270-degree observation.
gauge Classification:
1, pressure gauge according to their measurement accuracy categories: precision pressure gauge can be divided into the general pressure gauge. Precision pressure gauge measurement accuracy, respectively 0.1,0.16,0.25,0.4 grade level; general pressure gauge measurement accuracy were 1.0,1.6,2.5,4.0 grade level.
2, the pressure gauge at the direction of the base in different categories: classified into general pressure gauge, absolute pressure gauges, differential pressure tables. General pressure gauge to atmospheric pressure as the benchmark; absolute pressure form an absolute zero of pressure as the benchmark; differential pressure measurement in Table 2 the measured pressure difference.
3, pressure gauge measuring range according to their categories: divided into vacuum gauge, pressure vacuum gauge, micro-pressure tables, low tables, tables and high pressure in the table. Vacuum gauge used to measure the atmospheric pressure is less than the pressure value; pressure vacuum gauge used to measure the atmospheric pressure is less than and greater than the pressure value; micro-pressure form is used to measure the pressure value of less than 60000 Pa; low-pressure form is used to measure 0 ~ 6MPa pressure value; medium-pressure form is used to measure 10 ~ 60MPa pressure value; high pressures above the table used to measure the value of 100MPa.
4, there are some additional special features of the pressure gauge.
such as:
1) Seismic pressure gauge shell made of full-sealed structure, and the damping oil in the filling inside the shell, because of its damping effect can be used in the work environment, vibration or medium pressure (load) pulse measurement sites.
2) with an electrical contact manometer control switch allows the sender of the alarm or control functions.
3) organization with Remote pressure gauge shows the required signals (such as resistance of the signal or a standard DC current signal).
4) divide the table used by the Isolator (chemical seal) through the separation membrane, the measured isolation medium and instrument to measure the strong corrosion, high temperature, easy to crystallize media pressure.
The following cases discuss briefly the flexibility of mechanical pressure gauge sensitive components:
mechanical pressure gauge in the elastic sensing element with the pressure changes resulting from elastic deformation. Sensing element is generally made of copper alloy, stainless steel or made of special materials.    
sensitive components in a spring elastic tube (Bourdon tube) and the diaphragm and other forms: spring tube (Bourdon tube) were divided into C-type tube, coil spring tube, coil and other types. Spring tube, including cavity pressure, the use of their properties with the flexibility, the pressure can be easily transformed into the free end of the flexible spring tube displacement. Spring tube measurement range is generally 0.1MPa ~ 250MPa. 
diaphragm sensing element is a circular diaphragm with a wave, diaphragm itself is located between two flanges, or welded flange or the edge sandwiched between the two flange. Diaphragm side of the medium by measuring the pressure. This membrane, yielding a tiny bending deformation can be used to indirectly measure the pressure medium. The size of the pressure shown by the pointer. Diaphragm and Bourdon tube greater than its ability to pass. As the diaphragm itself is fixed around the edges, so its vibration is better. Diaphragm pressure gauge can reach very high over-voltage protection (eg, membrane attached to the flange plate above). Diaphragm could be added to improve corrosion protection of coatings. The use of open flange, washing, open diaphragm pressure gauges and other measures can be a great measuring viscosity, unclean and crystalline media. Diaphragm pressure gauge pressure measurement range 1600Pa ~ 2.5 MPa. Diaphragm sensor buckle together by two pairs of oval cross-section of the membrane composed of waves. Medium pressure measured in the membrane inside the box cavity, thus generated can be used to indirectly measure the deformation of media pressure. The size of the pressure value is shown by the pointer. Diaphragm pressure gauge usually used to measure the micro-gas pressure, and has a certain degree of over-voltage protection capability. Box-sensitive membrane component of several stacked together, will have a greater post-transfer ability to measure very small pressure. Diaphragm pressure gauge measuring the pressure range of 250Pa ~ 60000Pa.
pressure thermometer is the use of pressure and temperature within a certain range the relationship between changes in the use of pressure-sensitive element to represent a kind of high and low temperature instrumentation, with many non-power electrical measurement method is the same reason. The pressure of liquid pressure type thermometer, electric contact pressure type and other forms. I wish good!

Chinese:压力表和压力温度计有什么区别啊 ?

类别: 仪器仪表

问题:
压力表和压力温度计有什么区别啊 ?

回答:
压力表和压力温度计的区别是：前者是用来测量压强的仪表，而后者是利用压力和温度的相关关系用压力敏感元件的变化来表示温度的高低。先谈谈压力表，这里先要引入几个定义：
1、压力：
我们通常所说的压力，实际上是物理学上的压强，即单位面积上所承受压力的大小。
2、{jd1}压力：以{jd1}压力零位为基准，来计量压力的方式。
3、正压：以大气压力为基准，显示高于大气压力的压力。
4、负压（真空）：以大气压力为基准，显示低于大气压力的压力。
5、压差：两个压力之间的差值。
6、表压：以大气压力为基准，显示大于或小于大气压力的压力。
7、压力表：以大气压力为基准，用于测量大气压力的仪表。
在实际使用中，由于机械式压力表的弹性敏感元件具高机械强度以及生产方便等特点，因而得到广泛应用。
机械式压力表中的弹性敏感元件随着压力的变化而产生弹性变形。弹性敏感元件有弹簧管（波登管），膜片，膜盒及波纹管等形式。所测得的压力为相对压力。是以大气压力为基准的相对压力。弹性元件在介质的压力作用下产生弹性变形，通过压力表的齿轮传动机构放大后传给指针，压力表就会显示出相对于大气压的相对值。
每个压力表都有自己的测量范围，在测量范围内的压力值由指针显示，刻度盘的指示范围一般作成便于观察的270度。
压力表的分类：
1、压力表按其测量xx度分类：可分为精密压力表、一般压力表。精密压力表的测量xx度等级分别为0.1、0.16、0.25、0.4级；一般压力表的测量xx度等级分别为1.0、1.6、2.5、4.0级。
2、压力表按其指示压力的基准不同分类：分为一般压力表、{jd1}压力表、差压表。一般压力表以大气压力为基准；{jd1}压表以压力{jd1}零位为基准；差压表测量两个被测压力的差值。
3、压力表按其测量范围分类：分为真空表、压力真空表、微压表、低压表、中压表及高压表。真空表用于测量小于大气压力的压力值；压力真空表用于测量小于和大于大气压力的压力值；微压表用于测量小于60000 Pa的压力值；低压表用于测量0~6MPa压力值；中压表用于测量10~60MPa压力值；高压表用于测量100MPa以上压力值。
4、还有一些附加特殊功能的压力表。
如：
1）耐震压力表的壳体制成全密封结构，且在壳体内填充阻尼油，由于其阻尼作用可以使用在工作环境振动或介质压力（载荷）脉动的测量场所。
2）带有电接点控制开关的压力表可以实现发讯报警或控制功能。
3）带有远传机构的压力表可显示所需要的信号（比如电阻信号或标准直流电流信号）。
4）隔膜表所使用的隔离器（化学密封）能通过隔离膜片，将被测介质与仪表隔离，以便测量强腐蚀、高温、易结晶介质的压力。
下面例略谈一下机械压力表的弹性敏感元件：
机械压力表中的弹性敏感元件随着压力的变化而产生弹性变形。敏感元件一般是由铜合金、不锈钢或由特殊材料制成。  
弹性敏感元件有弹簧管（波登管）和膜片等几种形式 ：弹簧管（波登管）分为C型管、盘簧管、螺旋管等型式。弹簧管在内腔压力作用下，利用其所具有的弹性特性，可以方便地将压力转变为弹簧管自由端的弹性位移。弹簧管的测量范围一般在0.1MPa ~ 250MPa。 
膜片敏感元件是带有波浪的圆形膜片，膜片本身位于两个法兰之间，或焊接在法兰盘上或其边缘夹在两个法兰盘之间。膜片一侧受到测量介质的压力。这样膜片所产生的微小弯曲变形可用来间接测量介质的压力。压力的大小由指针显示。膜片与波登管相比其传递力较大。由于膜片本身周围边缘固定，所以其防振性较好。膜片压力表可达到很高的过压保护（比如膜片贴附在上法兰盘上）。膜片还可以加上保护镀层以提高防腐性。利用开口法兰、冲洗、开口等措施可用膜片压力表测量粘度很大、不清洁的及结晶的介质。膜片压力表的压力测量范围在1600Pa ~ 2.5 MPa。膜盒敏感元件由两块对扣在一起的呈圆形波浪截面的膜片组成。测量介质的压力作用在膜盒腔内侧，由此所产生的变形可用来间接测量介质的压力。压力值的大小由指针显示。膜盒压力表一般用来测量气体的微压，并具有一定程度的过压保护能力。几个膜盒敏感元件叠在一起后会产生较大的传递力来测量极微小的压力。膜盒压力表的压力测量范围在250Pa ~ 60000Pa。
压力温度计是利用压力和温度在一定范围内相互关系利用压力敏感元件的变化来表示温度高低的一种仪表，与许多非电量的电测法的道理是一样的。压力温度计有液体压力式、电接点压力式等多种形式。祝好！