曲線能精確表明熱動(dòng)元件在溫度范圍內(nèi)工作時(shí)推桿的升程變化。曲線分兩部分：升溫曲線-溫度上升時(shí)感溫蠟膨脹；降溫曲線-溫度降感溫蠟體積縮小。這兩個(gè)曲線同升程時(shí)的溫度差值為滯后性。這是內(nèi)部零件壓縮和摩擦以及熱慣性引起的。曲線的形狀和斜率取決于感溫蠟的膨脹率。
The curve below demonstrates what you would see if you graphed the performance of one of our thermal actuators. Our expansion curves graphically display an actuator’s performance as it heats up and cools down. Hysteresis is defined as the differential between the graphed upstroke and down stroke, this differential is caused by the thermal inertia within the actuator.