Datasheet

27
testo 635-1
The versatile instrument for
measuring air humidity, U-value,
material equilibrium moisture and
pressure dewpoint in
compressed air systems.
The humidity sensor, developed
by Testo, has proven itself
worldwide and has excellent
features in terms of precision,
long-term stability, temperature
resistance and robustness.
Up to 3 temperature or humidity
probes can be displayed
wirelessly in the testo 635
measuring instrument, i.e. data is
transmitted by radio. Selectable
user profiles, i.e. function buttons
allocated to a specified
application and menu guide
facilitate intuitive operation. Data
is transmitted via infrared to the
Testo printer.
Material moisture can be
displayed directly using special
probes. The heat transfer
coefficient (U-value) is measured
using the U-value temperature
probe and a radio probe. To
analyse humidity on ceilings and
walls, testo 635 shows the
dewpoint difference between
ambient air and wall surface.
Precision probes up to -60 °C
tpd are available for checking
pressure dewpoint in
compressed air systems.
Part no. 0560 6351
testo 635-1, humidity/temperature
measuring instrument, with battery and
calibration protocol
testo 635-1
Part no. 0563 6352
testo 635-2, humidity/temperature
measuring instrument with readings
memory, PC software and USB data
transmission cable, with battery and
calibration protocol
testo 635-2
Time for the essentials
“To be quite honest, the phones are
usually quiet between 6 and 7pm but the few
people who do call are delighted when somebody
answers the phone. That's why I'm happy to be
here. Testo at your service”
Wireless measurement of warehouse temperature and humidity, with radio handle
and attachable humidity probe head
Regina Walz
Sales
· Instrument store for 10,000
readings
· PC software for filing and
documenting measurement
data
· Direct display of material
moisture due to storable
characteristics curves (Basis:
material equilibrium moisture)
· U-value probe connection
possible
· Storage of single
measurements or
measurement series by
measurement site
· Quick access to the most
important functions via user
profiles
Cyclic printing of readings on testo printer, e.g. once per minute
testo 635-1 Advantages
testo 635-2 Advantages
· Connection of 3 radio probes
· Measurement of air humidity,
material equilibrium moisture
and pressure dewpoint in
compressed air systems
· Display of dewpoint difference,
min, max and mean values
· Print data on testo printer
(optional)
· Backlit display
· Protection type IP 54
testo 635 Common advantages
Technical data
Meas. range -200 to +1370 °C 0 to +100 %RH 0 to 2000 hPa
Resolution 0.1 °C 0.1 %RH 0.1 hPa
Accuracy
±1 digit
±0.3 °C (-60 to +60 °C)
±(0.2 °C + 0.3% of mv)
(remaining range)
Probe type Type K (NiCr-Ni) Testo humid. sensor,
cap.
-40 to +150 °C
±0.2 °C (-25 to +74.9 °C)
±0.4 °C (-40 to -25.1 °C)
±0.4 °C (+75 to +99.9 °C)
±0.5% of mv (remaining
range)
0.1 °C
NTC
(Humidity Probes)
Absolute pressure
probe
Oper. temp. -20 to +50 °C
Storage temp. -30 to +70 °C
Battery life 200 h
Battery type Alkali manganese, mignon, Type AA
Dimensions 220 x 74 x 46 mm
Weight 428 g