压力变送器属于什么类仪器？ 压力变送器是强制检定计量器具吗
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表压型压力变送器是以当地大气压作为参考零点的压力变送器。
1.Surface pressure transmitter:
Surface pressure transmitter is a pressure transmitter with local atmospheric pressure as reference zero.
2．绝对压力变送器：
绝对压力变送器是以真空度为参考零点的一款压力变送器。在使用过程中，传感器的参考零点可以随地点地域的变换而自动调整无需校正。外形与表压型压力变送器无二致。
2.Absolute pressure transmitter:
Absolute pressure transmitter is a pressure transmitter with vacuum as reference zero.In the process of using,the reference zero of the sensor can be adjusted automatically with the change of location and region without correction.The shape of the pressure transmitter is identical to that of the surface pressure transmitter.
3．差压变送器：
差压变送器是测量两压腔之间所受压力差值的压力变送器，差压变送器分别有“+”和“-”两个压腔。分别承接两作为比较值的压力，通常把压力较大的一端作为“+”压腔。需要特别注意的是在订购差压传感器时，请注意差压变送器特有的一项参数----耐受静压。在应用过程中，高静压低差压的使用现场屡见不鲜。订购的差压变送器所受静压不宜超出该差压变送器的耐受静压值，否则，很容易损坏。
3.Differential pressure transmitter:
Differential pressure transmitter is a pressure transmitter which measures the pressure difference between two pressure chambers.Differential pressure transmitter has two pressure chambers'+'and'-',respectively.Take two pressure as the comparative value separately.Usually,one end of the larger pressure is used as a'+'pressure chamber.It should be noted that when ordering differential pressure transducers,please pay attention to a specific parameter of differential pressure transducers-static pressure tolerance.In the application process,high hydrostatic pressure and low differential pressure are common in the field.The static pressure of the ordered differential pressure transmitter should not exceed the tolerance static pressure value of the differential pressure transmitter,otherwise,it is easy to damage.
4．投入/插入式液位变送器：
液位变送器分为投入式和插入式两种，两种形式无二致，都是把所受压力转换为液深。当水深为1m时，变送器所受压力为10KPa,订购此类传感器时就注意：
（1）所测量液体密度应告知生产单位。
（2）当测量介质具有腐蚀性时应告知生产单位。
（3）当测量介质温度超出-10℃和60℃时就告知生产单位。
4.Input/insert level transmitter:
The level transmitter can be divided into two types:the input type and the insertion type.The two forms are identical.They all convert the pressure to the depth of the liquid.When the water depth is 1 m,the pressure on the transmitter is 10 KPa.When ordering such sensors,pay attention to:
(1)The liquid density measured shall be notified to the production unit.
(2)When the measuring medium is corrosive,the production unit shall be informed.
(3)When the temperature of the measured medium exceeds-10~C and 60~C,the manufacturer will be informed.
5.中高温压力变送器：
针对测量现场环境温度过高或者测量介质温度过高，必须使用中高温压力变送器，该变送器具有较好的零点温度系数和灵敏度温度系数，在温度较高的环境下能够保证测量精度。在订购该类型变送器时须告知测量介质温度和环境温度，以为方便制作方合理应对。
5.Medium and high temperature pressure transmitters:
In view of the high ambient temperature or the high medium temperature in the measurement field,the medium and high temperature pressure transmitter must be used.The transmitter has better zero temperature coefficient and sensitivity temperature coefficient,and can guarantee the measurement accuracy in the high temperature environment.When ordering this type of transmitter,the measurement medium temperature and ambient temperature should be notified so as to facilitate the manufacturer to respond reasonably.
压力变送器不属于电气仪表！——压力变送器一般是用在压力管道的测量，还有一些大型的厂矿需要提供不同压力时进行压力信号的传送！及时提供输入输出压力的具体数值
压力变送器可以说是变送器里的敏感元件（传感器）将压力（物理信号）转换为数字（如4-20mA），直接显示出来的一种高精度仪表。
压力变送器属于自动化仪表,是一次仪表.
主要由测压元件传感器、测量电路和过程连接件等组成。压力变送器能将接收的气体、液体等压力信号转变成标准的电流信号(4~20mADC)，以供给指示报警仪、记录仪、调节器等二次仪表进行测量、指示和过程调节。
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