詳細(xì)信息
NTC熱敏電阻器系列
NTC熱敏電阻的基本電氣特性是它們隨溫度變化而改變電阻。即在一定的測量功率下，電阻值與環(huán)境溫度或自身溫度具有相對應(yīng)的關(guān)系，利用這一特性，將NTC熱敏電阻器用在電子線路上通過其電阻值的變化來確定相應(yīng)溫度的變化，以達(dá)到測溫和控溫的目的。我公司生產(chǎn)的熱敏電阻因其靈敏度高、性能穩(wěn)定、價格低廉，能滿足任何高精度的電子測溫控溫要求及電子線路的溫度補(bǔ)償需要。
應(yīng)用范圍
- 工業(yè)、醫(yī)療、環(huán)保、氣象、食品加工設(shè)備的溫度控制與檢測。
- 家用電器（如空調(diào)機(jī)、微波爐、電風(fēng)煽、電取暖爐等）的溫度控制與檢測
- 充電電池組及充電器的溫度保護(hù)
- 辦公自動化設(shè)備（如復(fù)印機(jī)、打印機(jī)等）的溫度檢測及溫度補(bǔ)償
Application
- Temperature measurement and inspection of industry,medical,environment protection,weather forecast,food processing equipment,etc
- Temperature control and detection of home appliance(forexampie air conditioning,microwave oven,electrlcfan,electric waming stove,etc)
- Temperature protection of battery pack and battery charger
參數(shù)定義：
- 零功率電阻（Rt）
在特定溫度（T）下，熱敏電阻所消耗之功率極低時所量到的直流電阻值。該電功率消耗低到如果電功率的再次下降，電阻值變化率仍小于0.1%
- 材料常數(shù)（B）
材料常數(shù)又稱貝他常數(shù)，即NTC熱敏電阻在某一溫度之電阻與另一溫度之電阻的比較值，可由下面的公式計(jì)算得到，并以卡氏溫度表示。
B=ln(R1/ R2)/(1/T1-1/T2)
- 熱時間常數(shù)
在零功率條件下，熱敏電阻之溫度依照步級函數(shù)下降到其最初溫度與最終溫度差之63.2%時所需的時間，通常以秒數(shù)表示。
- 耗散系數(shù)
在一特定的環(huán)境溫度下，熱敏電阻電功率消耗對本體溫度變化量的比值，通常以mW/℃表示。
- 最大穩(wěn)定電流（Imax）
NTC熱敏電阻能允許長時間通過的最大電流值，通常以安培（A）表示
Parameters definiton
- Zero-power resistance(Rt)
The zero-power resistance is the direct current resistance value of a thermistor measured at a specified temperature(t)with a power dissipation by the thermistor low enough that any further decrease in power will result in less than0.1 percent change in resistance
- Material constant(B)
The thermal constant of a NTC thermistor is a measure of its resisrance at one temperature compared to its resistance at a different temperature It value may be calculated by the formula shown blow and is expressed in degrees Kelvin the reference temperature used in this formula for determining material
B=ln(R1/ R2)/(1/T1-1/T2)
- Thermal time constant
The thermal time constant is the time required for a thermistor to change63.2 percent of total diference between its initial and final body temperature when subjected to a step function change in ambient temperature under zero-power condition and is normally expressed in second.
- Thermal dissipation coefficient
The thermal dissipation coefficient is the ratio ,normally expressed in milliwatts per degree C(mW/℃),
at a specified ambient temperature, of a change in power dissipation in a thermistor to the resultant body temperature change
- Maximum steady-state current(Imax)
The maximum steady-state current is the rating of the maximum current ,normally expressed in amperes(A), allowable to be conducted by an inrush limiting NTCthermistor for an extended period of time.