Datasheet

30
U-value measurement made easy with testo 635-2
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.
Temperature probe to determine U-
value, triple sensor system for
measuring wall temperature, modelling
clay included
Part no. 0614 1635
Measures the U-value in a wall in need of renovation using U-value and wireless
temperature/humidity probe (alternatively conventional temperature probe also possible)
Measures wall surface temperature using three fast-action thermocouple sensors
U-value measurement made easy with testo 635-2
testo 635-2, humidity/temperature measuring instrument with readings memory,
PC software and USB data transmission cable, with battery and calibration
protocol
0563 6352
Radio immersion/penetration probe, NTC, approval for the countries: DE, FR, UK,
BE, NL, ES, IT, SE, AT, DK, FI, HU, CZ, PL, GR, CH, PT, SI, MT, CY, SK, LU, EE,
LT, IE, LV, NO
0613 1001
Radio handle for plug-in probe heads, incl. T/C adapter, approval for the
countries: DE, FR, UK, BE, NL, ES, IT, SE, AT, DK, FI, HU, CZ, PL, GR, CH, PT,
SI, MT, CY, SK, LU, EE, LT, IE, LV, NO
0554 0189
Humidity probe head, attachable to radio handle 0636 9736
Radio module for measuring instrument, 869.85 MHz, approval for the countries:
DE, FR, UK, BE, NL, ES, IT, SE, AT, DK, FI, HU, CZ, PL, GR, CH, PT, SI, MT, CY,
SK, LU, EE, LT, IE, LV, NO
0554 0188
Temperature probe to determine U-value, triple sensor system for measuring wall
temperature, modelling clay included
Accuracy: U-value: ±0.1 ±2% of fsv (when used with an NTC or wireless humidity
probe for measuring outside temperature and 20 K difference between the air
inside and outside)
0614 1635
Service case for basic equipment of measuring instrument and
probes, dimensions: 400 x 310 x 96 mm
0516 0035
ISO calibration certificate/U-value probe 0520 0481
DAkkS calibration certificate/U-value probe 0520 0981
Or alternatively
(Successor organization of the DKD)