Platinum resistance applications and signal connections

Platinum thermal resistance principle is to use of platinum wire resistance value as the temperature changes in the design and production. SQH magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

the application of platinum thermal resistance, heat element skeleton material also is the main factor of decided to use the platinic resistance temperature area, common thermal element are ceramic element, glass components, mica elements, they are made of platinum wire around the ceramic skeleton respectively, glass frame, again on mica skeleton through a complicated process. Due to the performance of the different skeleton material itself, ceramic element is suitable for the temperature range of 850 ℃ below, glass components is suitable for the temperature range of 550 ℃ below. Appeared on the market a lot of thick film and thin film platinum thermal resistance temperature sensing element, thick film platinum thermal resistance element is to use platinum paste printing on the glass or ceramic plate, thin film platinum thermal resistance element is used platinum paste splash in glass or ceramic floor, then through photolithography, the temperature sensing element applies only to - Temperature range of 70 ~ 500 ℃, but the temperature sensing element material, can be mass production mechanization, high efficiency, cheap price. SQH magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

platinum thermal resistance can also be divided into industrial platinum thermal resistance and armoured platinum thermal resistance. Industrial platinum resistance is also called assembly platinum thermal resistance, that is, platinum thermal resistance sensor components will be welded on the wire assembly in metal or ceramic tube closed at one end, and then install on the junction box; Armoured platinum thermal resistance is the platinum thermal resistance element, transition, lead insulation powder in stainless steel tube to mold assembly pull firm as a whole, has a solid, anti-seismic, can be round, wire diameter is small, the advantages of easy installation. SQH magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

the platinum thermal resistance is the resistance changes of temperature change is converted to electrical component at a time, usually need to get the resistance signal through wire transfer to the computer control device or other instrument on at a time. What is platinum thermal resistance signal connection way? The following is to introduce specific. SQH magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

thermal resistance fuses there are three main ways: SQH magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

1, two wire: in the thermal resistance of a wire at each end connection to elicit resistance signal way call two wire: this kind of wire method is very simple, but because the wires are inevitably exist lead resistance r, r size and material of the wire and the length of the factors, so this method is only applicable to lead at a lower measuring accuracy SQH magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

2, three-wire system: the heat resistance of roots on one end of a wire, the other end connected to the two lead way called three wire system, the way which is equipped with a bridge, can be better to eliminate the influence of the lead resistance, is the most commonly used in industrial process control. SQH magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

3, four wire: in the root systems of thermal resistance on both ends of the two wire connection way called four wire, two of the root lead to provide constant current (I) for thermal resistance, the voltage signal into R U, again through the other two root lead to guide U to secondary instrument. Is this way of lead can completely eliminate the resistance of the lead, it is mainly used for high precision temperature detection. SQH magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

thermal resistance using three wire connection. Using three wire system is to eliminate the measuring error caused by the connection wire resistance. This is because the measuring thermal resistance of circuit is usually unbalanced bridge. Thermal resistance as a bridge bridge arm resistance, its connection wire ( From the thermal resistance is controlled by the) This part also become a part of the bridge arm resistance, resistance is unknown and change with environment temperature, cause measurement error. Using three wire system, will lead a received the power supply end of the bridge, the rest of the two respectively from thermal resistance of bridge arm and adjacent bridge arm, this eliminates the wire line resistance measurement error. SQH magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer