The difference between thermocouples and thermoelectric resistances in an air electric heater

Air heater is a kind of electric energy conversion to heat energy, to heat the heating material. The air heater in the work of low temperature fluid through a pipe under pressure into the input port, along the electric heating container specific heat flow, fluid thermodynamic principle design path using electric air heater, high temperature heat energy heating element of electric air heater working away in the generated in the air, the electric heater is the heating medium temperature, high temperature medium electric heater export process requirements. The electric heater of the internal control system according to the automatic regulation of the heater power output temperature sensor signal output port, the output of medium temperature electric air heater in uniform; when the heating element of electric air heater temperature, independent heating element overheating protection device power off immediately, to avoid heating material in electric air heater the overheating caused by coking, metamorphism, carbonization, leading to severe burn out air electric heater in the heating element, prolong the service life of the electric heater.

The air electric heater is also an internationally popular high quality long life electric heating equipment. The air electric heater is used to heat, heat and heat the liquid and gaseous media of the flow. When the heating medium air electric heater through the electric heating chamber under pressure, the fluid thermodynamics principle even take huge heat generated by the heating elements electric air heater in the air, the electric heater heating medium temperature reaches the requirement of customers.

The thermocouple and thermal resistance in the electric heater belong to the contact temperature measurement in the temperature measurement. Although their functions are the same, they all measure the temperature of the object, but their principles and characteristics are different.

First of all, let's introduce a thermocouple. Thermocouple is the most widely used temperature device in temperature measurement. Its main characteristics are wide temperature range, stable performance, simple structure and good dynamic response. It can transmit 4-20mA signal far away, and facilitate automatic control and centralized control. The temperature measurement principle of a thermocouple is based on the thermoelectric effect. Two different conductors or semiconductors are connected into a closed loop, when the two junction temperature is not at the same time, the loop will produce thermal potential, this phenomenon is called the thermoelectric effect, also known as the Seebeck effect.

Secondly, we introduce the thermal resistance in the electric heater. Although thermal resistance is widely applied in industry, because of its limitation in temperature measurement, the principle of measuring thermal resistance is based on the change of resistance value of conductor or semiconductor along with the change of temperature. Its advantages are many, and it can also transmit electrical signals far away. It has high sensitivity, strong stability, good interchangeability and accuracy, but it needs power supply excitation, so it can't measure temperature change instantaneously. The industrial thermal resistors usually use Pt100, Pt10, Cu50 and Cu100. The range of temperature measurement of platinum thermal resistance is generally 200-800 degrees below zero, and the copper thermal resistance is 40 to 140 degrees below zero. Thermal resistance is the same type as a thermocouple, but he does not need to compensate for a wire, and is cheaper than a thermocouple.

Thermocouple and thermal resistance all belong to the contact temperature measurement in the temperature measurement. Although their functions are the same, they all measure the temperature of the object, but their principles and characteristics are different.