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About the temperature of the temperature sensor selection problem

temperature temperature sensor selection is mainly based on the measurement range. When the measuring range is expected within the total range, can choose platinum resistance temperature sensor. Narrower range usually require basic resistance temperature sensor must have a fairly high, in order to get enough resistance change. Thermistor provided enough resistance change makes these sensitive element is very suitable for narrow measuring range. If the measuring range is quite large, thermocouple more applicable. Will also include freezing in this range, because of the thermocouple indexing table is based on temperature. Known within the scope of linear temperature sensor also can be used as a selection of the temperature sensor of strings attached.

response time is usually expressed in time constant, it is to choose another fundamental basis temperature sensor. When you want to monitor temperature storage tank, the time constant is not so important. However, when in use process must measure the temperature in the tube, vibration time constant becomes decision factor to choose temperature sensor. Bead type thermistor and armoured outcrop type thermocouple time constant is fairly small, and immersion probe, especially the thermocouple with protective casing, time constant is larger.

the dynamic temperature measurement is more complex, it is only through repeated tests, as far as possible close to simulate the temperature sensor used in the condition of frequent, to achieve reasonable approximate temperature sensor dynamic performance.

temperature sensor temperature

temperature temperature sensor is a very important part of the process control instrument, not only directly used for temperature measurement and control, and in some related parameters measurement and control system, often as a correction parameter, to realize precise measurement and control.

generally referred to the temperature of the temperature sensor (does not contain the temperature A meter) , its function is only tiny electrical signals from the temperature sensor to temperature, Voltage, current, resistance) Amplifier, translates into a standard electrical signals ( 0 ~ 10 ma, 4 ~ 20 ma, or 0 ~ 10 v, 1 ~ 5 v, etc. ) The output. After amplification and standardize the signal for long distance transmission and subsequent instrument for data processing. The current domestic popular called an integrated temperature sensor temperature ( Also known as integral temperature sensor temperature) , this kind of temperature sensor contains a meter ( Such as industrial thermocouple, industrial platinum resistance) , on the structure, electronic circuit and an instrument close together, for on-site installation, use provides a more convenient conditions. The output signal are two wire system commonly 4 ~ 20 ma current signal. Temperature of the temperature sensor input signal in essence, is a weak the change of the voltage, current, resistance, therefore, it is actually can with the output voltage, current, or resistance changes with temperature sensors, composed of the temperature sensor can measure all kinds of electricity parameters, such as pressure, differential pressure, displacement, Angle, etc. Owing to the temperature sensor is power input temperature, and the input signal is small, Voltage is generally for millivolt level, current signals to microampere resistance is the ohm) , high conversion accuracy, input and output signal transmission distance is likely to be far, input, output, general requirements for nonlinear correction signal, thus, compared with other temperature sensors which have more strict requirements.

how to select the correct of the thermistor temperature sensor for temperature

from the heat and temperature sensor drift

thermistor emits energy in the form of heat, it will affect the accuracy of measurement. Send out heat depends on the number of parameters, including material composition and current flows through the device.

is a thermistor temperature sensor drift to drift over time, usually by resistance percentage change of accelerated life test in the data table is given. If your application requires a longer service life, and the sensitivity and accuracy is consistent, please choose to have low self heating thermistor and temperature sensor drift small.