What are the industrial thermal instruments?

Thermal instruments include: thermocouple, thermal resistance, bimetal thermometer, temperature transmitter, temperature and humidity instrument (dew rapid thermometer, temperature remote transmitter, field thermometer, temperature and humidity controller, non-contact thermometer, etc. Electrical instruments include: panel digital instruments, portable digital instruments, electric energy meters, phase meters, voltage ammeters, frequency meters, q meters, ohm meters, millivolt meters, multimeters and other thermal instruments, which means "heat engine engineering control instruments", that is to say, water level and pressure started from boiler instruments at the earliest. Later, it was extended to the category of thermal control instruments. Later, people became accustomed to it, and everything related to industrial automation control was called thermal engineering. Thermal instruments can be said to be instruments for measuring, displaying and controlling liquid level, temperature, pressure, flow rate, density, chemical characteristics, vibration characteristics and rotation speed. The process flow in the process of industrial automation control, and the type of work that serves this object.