1. Thermocouple
Thermocouples are the most commonly used temperature sensors for temperature measurement. Its main benefits are a wide temperature scale and adaptability to a wide range of atmospheric environments, and it is robust, inexpensive, does not require electricity, and is also the cheapest. A thermocouple consists of two different metal wires (metal A and metal B) connected at one end, and when one end of the thermocouple is heated, there is a potential difference in the thermocouple circuit. The measured potential difference can be used to calculate the temperature.
However, the right-and-wrong linear relationship between voltage and temperature, because of the linear relationship between voltage and temperature, it is necessary to make a second measurement for the reference temperature (Tref), and use the test equipment software or hardware to process the voltage-temperature change inside the instrument to finally obtain the thermocouple temperature (Tx). Both the Agilent 34970A and 34980A data collectors have built-in measurement capabilities.
In short, thermocouples are the simplest and most versatile temperature sensors, but thermocouples are not suitable for high-precision measurement and application.
2. Thermistor
Thermistors are semiconductor materials, and most of them have a negative temperature coefficient, that is, the resistance decreases with the addition of temperature. Temperature changes result in large resistance changes, making it the most active temperature sensor. However, the linearity of thermistors is extremely poor and has a lot to do with the production process. Manufacturers can't give a standardized thermistor curve.
Thermistors are very small and respond quickly to temperature changes. However, thermistors require a current source, and their small size makes them extremely sensitive to self-heating errors.
The thermistor measures the absolute temperature on both lines, which has better accuracy, but it is more expensive than the thermocouple, and the measurable temperature scale is also smaller than the thermocouple. A commonly used thermistor has a resistance of 5 kΩ at 25°C, and a 200 Ω resistance change is formed for every 1°C temperature change. Note that a 10Ω lead resistor only creates an overnegligent 0.05°C error. It is ideal for current manipulation applications that require fast and active temperature measurements. The small size is advantageous for use with space requirements, but care must be taken to prevent self-heating errors.
Thermistors also have their own measurement techniques. The small size of the thermistor is an advantage, as it stabilizes quickly and does not form a thermal load. However, it is also very unrobust, and high currents will form self-heating. Because a thermistor is a resistive device, any current source will generate heat on it due to power. The power is equal to the product of the square of the current and the resistance. Therefore, a small current source should be used. If the thermistor is exposed to high heat, it will cause permanent damage.
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Are AC and DC contactors interchangeable?
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Installation and selection of high-frequency pressure sensors – Turck
1. Estrangement
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2. Accessories and hardware
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The difference between a transmitter and a sensor – Turck
A sensor is a general term for a device or device that can be measured by rules and converted into a usable output signal according to certain rules, which is generally composed of a sensitive element and a conversion element. When the output of a sensor is a regular gauge signal, it is called a transmitter.
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Differential pressure sensor applications – Turck
A differential pressure sensor is a sensor used to measure the difference between two pressures, and is generally used to measure the pressure difference between the front and rear ends of a certain equipment or component.
Typical Applications:
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Introduction to displacement sensors and their characteristics – Turck
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Turck has received two more awards at CAIMRS 2021
On March 19, 2021, the 2021 CAIMRS and Annual Selection and Awards Ceremony of China's Production Digital Service Summit hosted by Industrial Control Network was held in the form of real-time live broadcast in the cloud, and the results of the 19th Automation and Digitalization Annual Selection were released. Turck has once again been named one of the "Top 10 Companies of the Year".
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Characteristics and Measurement Mechanism of Torque Transducers - Turck
1. Determination mechanism
The commonly used torsional strain gauge is attached to the ductile shaft to be measured with strain adhesive and forms a strain bridge, which supplies power to the strain bridge. The electrical signal of torsion on the elastic shaft is immediately determined. After the strain signal is enlarged, it is changed to the positive and negative parts of the torsional strain after the voltage/frequency change.
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The internal composition of the tension force sensor
1. Sensor body: including the sensor's shell, mechanical structure, circuit board, etc.
2. Deformation element: It is the most important part of the tension sensor, which converts the force into signal output. Commonly used deformation elements are strain gauges, piezoresistive sensors, piezoelectric crystals, and compact gases.
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Turck sensor classification and its characteristics
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Introduction to TURCK's various sensors
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Sensor technology contributes to the rapid development of the robotics industry – Turck
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The pressure sensor is selected with an internal factor in mind – Turck
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Turck Error Factors for Pressure Sensors
When accounting for the total error of the pressure sensor, the error defined below should be applied. In order to determine the degree of error you have selected for a particular error in the pressure sensor, see the standard statement for that sensor in this catalog.
Note: In the use of specific users, some nominal indicators can be reduced or eliminated.
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The main role of torque sensors is Turck
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