For the thermocouple or heat resistance temperature sensor transmitter is using, that is the question

Temperature transmitter in the world of process manufacturing and research and development/test, temperature measurement and monitoring is one of the most widely used more common and application. Three cheong as temperature transmitter manufacturers, covering a wide range of sensor input transducer and alarm, and provides the best sensor questions about the assignments.

preliminary deceptively simple direct proposition, temperature range, the unit ( Usually a C or F) , limit set point, the temperature sensor types, the output signal, such as may be encountered unexpected problems in installation and start-up, upward.

temperature sensor selection criteria - in three chang prospectus The comparision of thermocouple and thermal resistance temperature sensor, thermocouple on the third page ( TC） Many measurement and RTD sensor between feature comparison table. Accuracy, stability/drift, sensitivity and the measuring range is some of the more obvious factors to consider, and did not consider the EMI signal strength, the reference junction, anti vibration/shock even character such as response time may be a conditional if excluded may influence the choice of measurement.

when the configuration of temperature sensor transmitter to customers advice, often appear a problem is & other; I need the thermocouple CJC or cold start compensation on or off? ” Use CJC TC transmitters On configuration seems to be a good rule of thumb, in order to obtain better accuracy of measurement. But, in fact, it may cause the measurement problem, such as the above described in part 3: the paper & other; Cold junction compensation of thermal hysteresis may make thermocouple bad choice, because it has a matching amplifier or cold end will be affected by rapid or rapidly changing environmental temperature. In addition, the cold junction compensation usually exist in the matching amplifier to its measurement circuit itself since the heating or the warm-up, so as to drive a long warm up time measurement system to achieve thermal equilibrium. “

part 1 white paper & other; The basic principle of temperature measurement & throughout; Other thermocouple sensor is introduced in consideration, after all, thermocouple is produced from the joint of two different metals by mV signal to operate, right? Me too, but not so fast, as mentioned in this white paper: & other; You may have been told is similar to the 'thermocouple produced by a combination of two different metals produces a small voltage'. Thermocouple this simplification is only half as a matter of fact, most of the conductor at one end and the other end of the small electromotive force ( emf) Or change the temperature difference between the imbalance will lead to a conductor on both ends of the temperature difference. ”

when applying the appropriate transducer to RTD sensor, its complexity increases beyond the RTD type ( Pt, Cu, Ni, platinum 100 ohms) is the most common , 2, 3 or 4 wire RTD and temperature range by linearization, Alpha value and other factors in the second part, the white paper & other; The basic knowledge of using RTD temperature measurement & throughout; In the discussed. Besides some convenient wiring diagram, this white paper also covers the choosing RTD potential errors that you might encounter. “ RTD prone to error of three groups of main: due to the components within tolerance, due to the components and be formed between the sensor material error caused by the thermal gradient, and the electricity in the connection between error sensor components and measuring instrument. Despite the fact that many of these error electrical fault, but the results of other mechanical failure is simply the RTD structure. “ RTD material, ohm and Alpha data and its main advantages include reference table. Thermistor is

our friends? So, this is indeed a rare bird measurement. However, I see more thermistor applications appear, and will launch another consider white paper USES thermistor and application. We can call it - Oh, I don't know - Perhaps & other; The basic knowledge of thermistor is used to measure the temperature & throughout; 。

ok, so you have a temperature sensor, both in the process of application, manufacture factory or test and measurement system, seems to be a bother, although there are some things to say after verification and real, also can't make an old dog new tricks old proverb. Each application has its own unique location, environment, material, sensor distance and the I/O variables, these are the current signal quality challenges, these challenges could never experienced before. As the sensor signal input/output transmitter manufacturers, three chang instrument not only here to help you choose is suitable for the transmitter, sensors can also help you choose the best sensor as auxiliary material, so you won't because overheating under a temperature measurement applications.