太阳能热水器用温度传感器

3、Electronic Parameter Specification

⑴．Resistance @25℃：

R₂₅＝10KΩ±1% (at 25℃)

⑵．Bconstance：

B（25/85）＝3977K±0.5%

Test relative resistance at 25±0.05℃, 85±0.05 in the high precision temperature oil-tank, the calculate B constance according to the following formula. 

B_t1/t2=ln(R_t1/R_t2)/(1/(t1 273.15)-1/(t2 273.15))

⑶．Dissipation Factor:

Min. dissipation factor in still air:3mw/℃，3mW/℃（min, in air）

⑷．Thermal time constant:

In still air：τ≤12s, 12sec(max, in still air)

⑸．Operating temp.:-40℃~125℃

4、Reliability Characteristics

⑴．Heat resistance test

Aging 1000±24 hours at 110±5℃ in baking box. Performance（R25, B_25/85）change rate less than ±1% after aging.

⑵．Cold resistance test

Aging 1000±24 hours at -30℃±5℃in oil tank. Performance（R25,B B_25/85）change rate less than ±1% after aging. 

⑶．Temperature Cycling

–30℃×5min in oil tank → 90℃×5min in oil tank.  Performance（R25,B B_25/85）change rate less than ±1% after 1000 times cycling.

⑷．High temperature aging test under 5V DC

Aging 1000±24 hours at 110±5℃ under 5V DC in still air, Performance（R25, B_25/85）change rate less than ±1% after aging.