Linear PT100 temperature thermocouple sensors using method

What is a linear NTC temperature thermocouple sensors?

linear temperature thermocouple sensor is linear output negative temperature coefficient ( The NTC) Thermal element, it is actually a kind of linear temperature - Voltage conversion element, that is, in general working current, 100uA） Conditions, the voltage is linear change with the temperature of components so as to realize the linear transformation of non-electricity to electricity. What is the main characteristic of linear NTC temperature thermocouple sensors?

the thermocouple temperature sensor is its main feature is the temperature - working temperature scope Voltage relations as a straight line, for the secondary development of temperature measurement, temperature control circuit design, will be without linearization, can complete the design of the temperature or temperature control circuit, thus simplify the design and debugging of instrument. Linear NTC temperature thermocouple sensors measuring temperature range is how to provide?

in terms of the total, temperature range, can be in Between 200 ℃ ~ + 200 ℃, but considering the actual needs, generally do not need to such a wide temperature range, and three different sections, to adapt to the different packaging design, at the same time in the selection of extension is also different. Linear temperature sensor for temperature compensation is special, set the working temperature range for - only 40℃～+80℃。 Can completely satisfy the general circuit of temperature compensation. Selection of extension shall comply with the principles of what?

in - general 200～+20℃、- 50 ~ + 100 ℃ advisable choose ordinary double glue line; In the range of 100 ~ 200 ℃ should choose high temperature line. What is the meaning of the reference voltage?

reference voltage is refers to the thermocouple sensor under 0 ℃ temperature field ( Ice water) In general, taking the working current ( 100μA） Conditions, a thermocouple sensor voltage value. In fact is the point of zero voltage. The symbol for V ( 0) The factory calibration, the value, because the temperature of the thermocouple sensor coefficient S is the same, as long as know the benchmark voltage V ( 0) , can any knowledge point of thermocouple temperature sensor voltage value, rather than for dividing thermocouple sensor.

the calculation formula is:

V ( T） =V（ 0) + S (T

example: such as reference voltage V ( 0) = 700 mv; S = - temperature coefficient 2 ℃ mv, then at 50 ℃, thermocouple sensor output voltage V ( 50) = 700 - 2×50=600（ mV） 。 This linear temperature thermocouple sensors is superior to other beauty of thermocouple temperature sensor. The temperature coefficient S mean?

temperature coefficient S refers to the regulation of working conditions, the thermocouple sensor output voltage value of the ratio of change and temperature change, namely every 1 ℃ temperature change of thermocouple sensor output voltage value of change: S = delta V delta T ( mV℃） 。

temperature coefficient is the linear temperature thermocouple sensor as the physical basis of temperature measuring element, its role is similar to B value of the thermistor, the parameters in the whole operating temperature range is the same value, namely - 2 ℃ mv, and various types of thermocouple sensor is the same value, this traditional thermistor temperature thermocouple sensor is incomparable. Swap the parameter precision of what's the point?

swap accuracy refers to work in the same conditions, The same working current, the same temperature field) For the determination of the same ideal fitting line, each a thermocouple sensor voltage V ( T） — T temperature curve and the maximum deviation of straight line, this deviation is often according to the temperature of thermocouple sensor, Voltage conversion coefficient S converted into temperature. As a result of the thermocouple sensor output linearization and temperature - Voltage conversion coefficient is the same, that is, within the scope of temperature to the swap, so the exchange said the reference voltage value of the discrete degree of accuracy, temperature converted into discrete values of reference voltage values are used to describe the size of the degree of interchange between the whole batch of thermocouple sensor. Generally divided into three: class I swap deviation is not greater than zero. 3℃; J is not greater than zero. 5℃; K is not greater than 1. 0℃。

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