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| How to understand the primary and secondary instruments |
| 2011-6-1 15:38:37 |
How to understand the primary and secondary instruments
仪表 与二次 仪表 是仪表安装工程的习惯用语。 Primary and secondary meters are the idioms for meter installation engineering. 显示仪表 。 The exact names should be measuring instruments and display instruments . The measuring instrument is in direct contact with the medium and is installed outdoors in the field. Most of the display instruments are installed on the control room panel. In order to distinguish the instruments in a system, the instruments installed on-site are referred to as primary instruments, and the panel-mounted display instruments are referred to as secondary instruments.
The primary instrument is one of the components (elements) of the automatic detection device. With a sensing element for sensing changes in the parameters of the measured medium. Or with a ruler to indicate the reading; or without a ruler, it does not indicate the reading itself.
In the production process, measuring instruments are often referred to qualitatively according to the number of times of energy conversion, energy conversion is called once, and conversion twice is called secondary. 热电偶 本身将热能转换成电能，故称一次仪表，若再将电能用电位计 ( 或毫伏计 ) 转换成指针移动的机械能时，进行第二次能量转换就称为二次仪表。 Taking the temperature measurement of a thermocouple as an example, the thermocouple itself converts thermal energy into electrical energy, so it is called a meter. If the electrical energy is converted into mechanical energy with a potentiometer ( or millivolt meter ) , the second energy conversion is performed. It is called a secondary meter. 孔板测量流量 ，孔板本身为一次仪表， 差压变送器 没有称呼，而指示仪表则叫做二次仪表，用以指示、记录或积算来自一次仪表的测量结果。 The number of times of energy conversion more than two is often called twice. For example , the orifice plate is used to measure the flow rate . The orifice plate itself is a primary instrument, the differential pressure transmitter is not called, and the indicator instrument is called a secondary instrument to indicate and record. Or accumulate the measurement results from a meter.