Variable diameter thermistor

Industrial thermal resistors are divided into two categories: platinum thermal resistors and copper thermal resistors. Thermistor measures temperature by utilizing the characteristic that a substance's own resistance changes with temperature. The heated part (temperature sensing element) of a thermal resistor is uniformly wound around a skeleton made of insulating material with thin metal wires. When there is a temperature gradient in the measured medium, the measured temperature is the average temperature in the medium layer within the range of the temperature sensing element. Prefabricated thermal resistors are mainly composed of junction boxes, protective tubes, terminal blocks, insulation sleeves, and temperature sensing elements, and are equipped with various installation and fixing devices. The temperature sensing element of WZP platinum resistor is a platinum wire winding, and the dual platinum resistor is mainly used in situations where secondary display, recording or regulating instruments are required to simultaneously detect the temperature at the same location. The temperature sensing element of WZC type copper resistor is a copper wire winding.

Principle of Thermistor Temperature Measurement

The resistance of the heated metal wire changes with temperature, and the relationship between its thermal resistance value R (t) and the temperature t it is at can be expressed as: R (t)=Ro (1+At+Bt2+------). The measured temperature value t can be obtained by checking the corresponding scale according to the measured resistance value. Alternatively, it can be directly read out by a display instrument.

Industrial thermal resistance contains two categories, Pt thermal reistance and Copper thermal ressistance.

Thermal resistance is used to measure temperature on the basis of the property that substances’own resistance varies with the temperature. The part of the thermal resistance that is heated (temperataure-sensing element) is made by dual winding of fine wires around the frame made of insulation materials. When there is temperature gradient in the mediums to be measured, the measured temperature is the average temperature in the dielectric layer within the range where the temperature-sensing element is placed. Packaged thermal resistance consists of connection box, protectin tube, connection terminal, insulating sleeve and various fixed devices. WZP Pt resistance’s temperature-sensing element is a Pt wire winding. Double platinum resistance mainly is used fou such situation where it is required to use secondary display instrument, recorder and accommodometer to simultaneously detect the temperature of the same place. WZC copper resistance’s temperature-snesing element is a copper wire winding.

Temperature measurement principle of thermal resistance

The resistance of the metal wire that has been heated varies with the termperature, and the relation between the thermal resistance value and the temperature it is at can be expressed as R(t)=Ro((1+At+Bt2+------)According to the resistance value that is measured to refer to corresponding graduation mark, the temperature t that is measured can be come out, or read it directly from the indicating instrument.