primary instrument
Automatic detection device parts (components) is one. With feelings of components, to feel the change in medium parameters measured. Or a ruler, reading instruction; or no ruler, itself does not indicate readings.
In the production process, measuring instruments are often used by qualitative change to the number to call, said energy conversion once a meter, the conversion of said two secondary instrument. Thermocouple temperature measurement, for example, thermocouple itself will heat into electricity, it is called a meter, if more electricity to power meter (or mV meter) into mechanical energy when the pointer moves, the second energy conversion is called the secondary instrument. More than twice the number of transducers are often called by two, such as orifice flow measurement, orifice itself is a meter, differential pressure transmitter does not address, while the indicating instrument is called a secondary instrument. |