WZP-620/630系列固定螺紋錐度熱電阻,采用整體鉆孔可用于壓力較大的場所,工業(yè)用熱電阻作為溫度測量傳感器,通常與溫度變送器,調節(jié)器以及顯示儀表等配套使用,組成過程控制系統(tǒng),用以直接測量或控制各種生產過程中-200℃-500℃范圍內的液體,蒸汽和氣體介質以及固體表面的溫度。
固定螺紋錐度熱電阻，工業(yè)用熱電阻分鉑熱電阻和銅熱電阻兩大類。熱電阻是利用物質在溫度變化時自身電阻也隨著發(fā)生變化的特性來測量溫度的。熱電阻的受熱部分（感溫元件）是用細金屬絲均勻地雙繞在絕緣材料制成的骨架上。當被測介質中有溫度梯度存在時，所測得的溫度是感溫元件所在范圍內介質層中的平均溫度。裝配式熱電阻主要由接線盒、保護管、接線端子、絕緣套管和感溫元件組成，并配以各種安裝固定裝置。
WZP型鉑電阻的感溫元件是一個鉑絲繞組，雙支鉑電阻主要用于需要用二次顯示、記錄或調節(jié)儀同時檢測同一地點溫度的場合。WZC型銅電阻的感溫元件是一個銅絲繞組。 熱電阻測溫原理
受熱后的金屬絲電阻隨著溫度的變化而變化，其熱電阻值R(t)與其所處溫度t的關系可表示為： R(t)=Ro(1+At+Bt2+------)按測得的電阻值查相應分度號表即可得出被測溫度值t。或由顯示儀表直接讀出。
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
