Measuring Method of Platinum Thermal Resistance Sensor
Although high precision platinum thermal resistance sensor is often used in industrial temperature measurement, it has not been widely used in the field of temperature measurement.For industrial production, platinum thermal resistance with high precision and high stability improves product quality, but increases the cost. Being squeezed by the price market of the same trade, the common thermal resistance sensor has become the first choice of buyers. From my point of view, only high quality products can win the market and be recognized by users.
From a business point of view, buyers only see the platinum thermal resistance sensor is expensive, but they have ignored its practical use. Generally speaking, platinum thermal resistance sensors are divided into two wire system, three wire system and four wire system. The two-wire system has a large error in measurement and is no longer used. Therefore, industrial temperature measurement is generally three-wire system, and the laboratory is generally four-wire system. However, three-wire platinum thermal resistance sensors are currently the most commonly used. Its measurement method is in a "a" side parallel resistance a "c" side, so as to realize the resistance leads to "a", "b", "c" three terminals, in this case, again by introduced by "b" wire measuring the resistance of the wire itself, can be compensated, by "c" wire make the wiring resistance do not vary with temperature and the introduction of the effect of lead resistance error decrease a lot. The three-wire platinum thermal resistance sensor is a bridge with variable resistance value. According to the different measuring range of the platinum thermal resistance, the platinum thermal resistance in the bridge of the secondary instrument can be fine-tuned so as to make more accurate measurement.
The particularity of platinum thermal resistance sensor is illustrated by practical analysis. Compared with the common material thermal resistance sensor, it can have higher precision and stability. It also means that it's value is much higher than the price.