The structure of platinum-rhodium thermocouple and the cold end temperature compensation

In order to make the platinum rhodium thermocouple to be reliable, steady state to complete the task, we is have certain requirements for its structure. So what are the requirements? First of all, the composition of platinum-rhodium thermocouple two hot electrode welding must be to ensure that the firm; Second, it shall do a good insulation between the two hot electrode processing, otherwise, will short circuit may occur.

in addition to the above two requirements, we also need to ensure that compensation conductor to platinum rhodium thermocouple free end connection can satisfy the agile and convenient, and reliable. In addition, the use of protective casing need to ensure that sufficient heat between the electrodes and harmful medium isolation. Then, the cold end temperature compensation is what? The following to analyze this problem.

everybody should know, when we in the production of platinum rhodium thermocouple, the materials used are usually more expensive, but the distance between the temperature measuring point and the instrument is very far. So, in order to save the cost of materials, we usually is to use its cold junction compensation conductor should be extended to relatively stable control indoor temperature, and then connected to the meter terminals. It is important to note, however, compensation conductor only works as an extension of hot electrode.

this is to say, its itself will not bring any influence to platinum rhodium thermocouple temperature change, can't afford to compensate. So, we also need to use other correction method to compensate the influence of the cold end temperature on the temperature measurement. When using compensation conductor, be sure to pay attention to choose the corresponding model, cannot be wrong polarity, and the compensating conductor and connect the temperature should be controlled within 100 ℃.

the content of the above described is the structure of platinum rhodium thermocouple, and the cold end temperature compensation, hope after learning the content, you have a better understanding of how to platinum rhodium thermocouple, also hope that we can gain the knowledge of the need.