Thermocouple sensor _ instrument

Thermocouple temperature measuring instrument is commonly used in temperature measuring element, is made up of two different components of the conductor when two ends synthesis loop, when the two junction thermocouple temperature is not at the same time, will produce thermal current in the circuit. If the work end of the thermocouple with the reference entity temperature difference, display instrument will indicate the thermocouple thermoelectric potential of the corresponding temperature value. Electric hot thermocouple will grows with the temperature measuring end, it is only with the size of the thermocouple temperature at the ends of the materials and relevant, has nothing to do with the hot electrode length and diameter. The appearance of all kinds of thermocouple is often due to the need to vary, but their basic structure is roughly same, usually by the hot electrode, insulation sleeve to protect the main parts such as pipe and connection box, through compensation conductor and digital display table, recording instrument and electronic regulator. Thermocouple measuring temperature to the cold end ( Measure the end for the hot end, by the end of the lead connected to the measurement circuit is called cold junction) Temperature remains constant, the size of thermoelectric potential and measured temperature in certain proportion relationship. When measuring, the cold end ( Environment) Temperature changes, will seriously affect the accuracy of measurement. Take action at the cold end compensation due to the impact of the cold end temperature change is called the thermocouple cold junction compensation is normal. Attachment: thermocouple cold junction compensation calculation method: from millivolt to temperature: measure the cold end temperature and conversion for the corresponding millivolt values, millivolt values with thermocouple, the temperature conversion. From the temperature to the millivolt: measure the actual temperature and the cold end temperature and conversion for millivolt values, respectively, after subtracting the millivolt values, quick temperature. Thermocouple principle of two kinds of different ingredients of conductor ( Called the thermocouple wire or hot electrode) Two ends synthesis loop, when two junction temperature is not at the same time, in the circuit will generate electromotive force, this kind of phenomenon called the thermoelectric effect, and the electromotive force called thermoelectric potential. Thermocouple is to use the principle of temperature measurement, which directly used for measuring the medium temperature is called at the end of the working side ( Also known as the measuring end) , on the other side called cold end ( Also known as compensation) ； The cold end connected to the display instrument or meter, digital display table will point out the thermocouple thermoelectric potential. Thermocouple is actually a kind of energy converter, it converts heat into electricity, using thermoelectric potential generated by the measuring temperature, the thermocouple thermoelectric potential, we should pay attention to the following questions: 1: thermocouple thermoelectric potential is thermocouple temperature on both ends of the work on the function of the poor, rather than the thermocouple cold end with the job, temperature difference on both ends of the function; 2: the size of the thermocouple thermoelectric potential produced by, when material is uniform thermocouple, has nothing to do with the length and diameter of thermocouple, and only at the ends of the thermocouple material composition and temperature difference; 3: when the two thermocouple wire thermocouple material component is determined, the size of the thermocouple thermoelectric potential, only related with the thermocouple temperature difference; If the thermocouple cold end temperature keeping, this into the thermocouple thermoelectric potential is only the end of the single value function of temperature. Two different welding material A conductor or semi-conductor A and B, form A closed loop, as shown. When the conductor A and B two persistent point temperature difference between 1 and 2, occurs between the electromotive force, thus forming the size of A current in the circuit, this kind of phenomenon called the thermoelectric effect. Thermocouple is in using this effect to work. Furnace tube furnace tube blade blade thermocouple parameters thermocouple type and specification what is 1, the application of furnace tube furnace tube thermocouple blade blade thermocouple used blade type joint welded directly on the surface of furnace tube, applicable to the oil industry furnace tube, the tower wall surface temperature measurement. Is necessary refinery fractionating tower temperature measuring device. 2, as the main technical parameters of the furnace tube blade thermocouple electrical exports: m20x1. 5, npt1/2 level of accuracy: I, ii protection grade: ip65 nominal pressure: 10 mpa3, furnace tube, thermocouple type blade and specifications dividing ℃ temperature range protection tube material specifications DLWRNK - thermal response time 231 dk0 - 1000年gh3030446ss≤10 sΦ8Φ12。 710001500200030000 - 8001 cr18ni9ti note: thermocouple grade I order by the agreement; Protecting tube order the rest of the material according to the agreement.