Sick Sensors – The lead method for RTD sensors

Create Date: 2024-8-30 12:03:23|Source: SICK/Sick

1. Two-wire system: the way to connect a wire at both ends of the thermal resistance to draw out the resistance signal is called the two-wire system: this lead method is very simple, but because there must be a lead resistance r in the connecting wire, the size of R is related to the material and length of the wire, so this lead method is only suitable for occasions with low measurement accuracy

2. Three-wire system: the way of connecting one lead wire at one end of the root of the thermal resistance and connecting two leads at the other end is called the three-wire system, which is usually used with the bridge, which can better eliminate the influence of the lead resistance and is the most commonly used in industrial process control.

3. Four-wire system: the way of connecting two wires at both ends of the root of the RTD is called the four-wire system, in which two leads provide constant current I for the RTD, convert R into voltage signal U, and then lead U to the secondary instrument through the other two leads. It can be seen that this lead method can completely eliminate the influence of the resistance of the lead, and is mainly used for high-precision temperature detection.

The RTD adopts the three-wire connection method. The three-wire system is used to eliminate measurement errors caused by the resistance of the connected wires. This is because the circuit used to measure RTD is generally an unbalanced bridge. As a bridge arm resistance of the bridge, the connecting wire (from the RTD to the center control room) also becomes a part of the bridge arm resistance, which is unknown and changes with the ambient temperature, causing measurement errors. The three-wire system is adopted, one wire is connected to the power supply end of the bridge, and the remaining two are connected to the bridge arm where the thermal resistance is located and the bridge arm adjacent to it, so that the measurement error caused by the resistance of the wire line is eliminated.

Sick Sensors – The lead method for RTD sensors

More on that

	Sick Sensors – Common classifications and connections for RTD sensors 1. Platinum thermal resistance The platinum metal is used as the temperature sensing element, and then together with the inner lead and the protective tube, the platinum thermal resistance temperature sensor is formed. It is also often connected to external measurement circuits, controls, and mechanisms to form a temperature sensor. This sensor has two main ...
	Sick Deep Learning SensorApp Intelligent Inspection Plus released Based on the InspectorP series of Sick 2D smart cameras, the deep learning SensorApp Intelligent Inspection Plus was officially launched, adding "Anomaly detection" and "Classification ...
	Applications of Sick photoelectric sensors Photoelectric sensors that use optoelectronic components as sensitive components have a wide variety of types and applications. According to the nature of the output of photoelectric sensors, they can be divided into two categories: (1) The photoelectric measuring instrument made by converting the measured into a continuously changing photocurrent, can be used to measure the intensity of light and the object ...
	Introduction to the characteristics of the Sick sensor - infrared distance sensor 1) Long-distance measurement, in the case of no reflector and low reflectivity, it can measure a long distance; 2) There is a synchronous input terminal, which can be measured synchronously by multiple sensors; 3) Wide measurement range and short response time; 4) Compact design, easy to install, easy to operate ...
	Sick Sensors – How RTD sensors work Thermal resistance is used to measure the temperature of a substance when its temperature changes, and its resistance also changes with the characteristics of the change. When the resistance value changes, the working instrument will display the temperature value corresponding to the resistance value. RTD sensors use the resistivity of conductors or semiconductors to change with temperature.
	Sick Sensors – the working principle and application of color sensors What are the applications of color sensors? 1. Discrete photodiode with color filter The traditional color sensing method uses a structure in which three to four photodiodes are combined on a single chip, and red, green, and blue filters are placed on the surface of the photodiodes. An independent ...
	Introduction to the product functions of Sick 1. Measurement Sensors and sensor systems from SICK measure dimensions, profiles, volumes, distances, speeds, and filling levels to ensure smooth processes. 2. Detection SICK sensors can detect the presence and quality of various objects as well as the quality of consumer products to meet the needs of ...
	Common faults of SICK sensors 1. The pressure receiver transmitter cannot return to the zero position The output of the SICK sensor does not change, and the output of the repressurized transmitter changes suddenly. Once the sensor is tightened, the sealing ring is compressed to the sensor pressure port to block the sensor. When pressure is applied, the pressure medium cannot ...
	How to maintain the Sick sensor 1. It is necessary to prevent the sensor from contacting corrosive gases, so as not to cause corrosion and affect the measurement results. 2. If the measurement is a high-temperature medium, the SICK sensor should see whether the temperature is within the suitable temperature range of the sensor.
	Sick Sensors – Common classifications and connections for RTD sensors 1. Platinum thermal resistance The platinum metal is used as the temperature sensing element, and then together with the inner lead and the protective tube, the platinum thermal resistance temperature sensor is formed. It is also often connected to external measurement circuits, controls, and mechanisms to form a temperature sensor. This sensor has two main ...
	Full-process baggage tracking solution for Sick Airport The important indicator of airport baggage tracking is: accurate and timely delivery of baggage, and SICK has a rich and complete solution in the field of air baggage reading. 　　This article will take you to take a detailed look at SICK's solutions for the whole process of baggage tracking and traceability. The core of the system 　　Model...
	Sick Sensors – A detailed introduction to the principles of the five common pressure sensors 1. Piezoelectric pressure sensor Based on the piezoelectric effect, electrical components and other machinery are used to convert the pressure to be measured into electricity, and then perform related measurement work. Piezoelectric sensors can only be used for dynamic measurements. Host...
	Sick intelligent sensors help the intelligent transformation of the pharmaceutical industry With the obvious trend of population aging and the innovation and development of the medical and pharmaceutical industry, it can be expected that the demand for pharmaceutical products in China will continue to grow rapidly, and it is estimated that the industry scale will reach 2.15 trillion yuan by 2024. The huge market size also means more fierce market competition, plus ...
	Sick has joined forces with SATO, a world-renowned manufacturer of printing and recognition solutions As an expert in smart sensors, Sick has teamed up with SATO, a world-renowned manufacturer of printing and recognition solutions. Through the on-site practical application cases, not only the technical characteristics of SICK & SATO were demonstrated, but also the possibility of integrating barcode and RFID technology in the automated production line at the same time.
	The GLS621, a new member of the Sick AGV/AGC navigation sensor family As a special sensor for the two-dimensional code positioning and navigation market, GLS621 is mainly used in warehousing AGVs or warehouse handling robots based on the principle of inertial two-dimensional code navigation.
	What are the main uses of Sick sensors – laser distance sensors? 1. Laser length measurement Precision length measurement is one of the key technologies in the precision machinery manufacturing industry and the optical processing industry. Modern length measurement is mostly carried out by using the interference phenomenon of light waves, and its accuracy mainly depends on the monochromacy of light. Laser is the most ideal light source, it is more ...
	New Arrivals \| Sick safety locking device FLEXLOCK SICK's new generation of RFID monitoring security locking device FLEXLOCK is officially launched. The FLEXLOCK safety locking device for RFID monitoring has an operating radius of 180° for greater flexibility and is also suitable for protective doors with smaller radii. LED lights can be selected from ...
	Sick Sensors – Applications for thermistor sensors 1. Thermistor sensor temperature measurement Thermistor sensors used to measure temperature are generally simple in structure and inexpensive. Thermistors without an outer protective layer can only be used in dry places; Hermetically sealed thermistors are not afraid of moisture erosion and can be used in harsh rings.
	Classification and introduction of SICK sensors - pressure sensors Pressure Sensor Classification: There are great differences in the skills, design, function and adaptability of pressure sensors, as well as the conditions and price of pressure sensors. According to preliminary estimates, there are more than 60 types of pressure sensors in the world and at least 300 companies produce pressure sensors. Pressure...
	Sick Sensors - Classification of RTD Sensors and Their Characteristics and Uses 1. NTC RTD Sensor: Features: This kind of sensor is a negative temperature coefficient sensor, that is, the sensor resistance decreases with the increase of temperature; Application: NTC thermistors are commonly used as temperature measurement tools on the air side and medium side in automotive thermal management systems, such as evaporation.