库号：M1731399 品牌/制造商： 德国Testo德图 型号：
The U-value (formerly k-value) is the most important value used to rate the energy efficiency of building components. With the new testo 635 measuring this value has never been easier.
Three temperature values are needed to determine the U-value: outer temperature, surface temperature of inner wall as well as indoor air temperature.
Using the new wireless probes, the outer temperature can be quickly and easily measured with the window closed. The probe is simply positioned outside and transmits readings by radio to the measuring instrument in the room.
With the new patented U-value probe the two other temperatures required are measured using one probe. To measure surface temperature, three wires from the U-value probe are attached to the inner wall using modelling clay. The air temperature is measured by a sensor on the probe plug.
The three temperatures needed are determined by the connected temperature probes and transferred to the testo 435. The instrument calculates the U-value from them and shows it directly in the display.
Type K (NiCr-Ni)
测量范围：-20 ~ +70 °C
测量精度：1级精度 1?
U-value: ±(0.1 °C + 0.2 %测量值)*
*when used with an NTC or wireless humidity probe for measuring outside temperature and 20 K difference between the air inside and outside
1符合EN60584-2, 在 -40 ~ +1200 °C 内满足2级精度
