Compact Pro Series
testo 635
%RH
°F
“H
2
0
NEW!
The working standard for temperature and humidity measurements
°F td
Today’s professional humidity measurements
require a reliable and precise humidity probe.
The internationally patented Testo humidity
probe guarantees accurate and reliable
longterm measurement results everytime.
Its proven reliability has been demonstrated
during many endurance tests under extreme
conditions and in international inter-laboratory
testing. Trust Testo probes to deliver measuring
confidence in the most demanding applications.
Reliable long-term humidity measurement
The duct and indoor air temperature range of -4...+158 °F is
monitored with a compact humidity probe. In addition to
relative humidity, both air temperature and dew-point are also
displayed.
Moisture on ceilings and walls is often the result of building
damage or insufficient ventilation. With the help of testo 635,
the difference between the wall surface temperature and the
calculated dew-point temperature of the room can be
determinded with the cross-band probe. The actual
temperature of the wall surface is displayed in seconds.
The rugged humidity probe is available for measuring
equilibrium moisture at higher temperatures up to +280 °F.
Building moisture as well as material moisture can be
displayed by testo 635 on the basis of equilibrium moisture.
Ten material characteristics curves are programmed in the
testo 635 to help determine equilibrium moisture.
The pressure dew-point probe was developed especially for
monitoring humidity in compressed air lines down -76 °F tpd.
The pressure dew-point is displayed directly on the testo 635
with the pressure dew-point probe.
The right probe for every application
With the new testo 635 you can monitor and
analyze air humidity, material moisture (basis:
equilibrium moisture) and pressure dew-point.
Three precision probes were tested in an extensive interlaboratory test at the PTB in Berlin, the NIST in the USA, the
French National Institute CETIAT, the Italian National Institute
IMGC, the English National Institute NPL, the Spanish National
Institute INTA, JQA in Japan, KRISS in Korea, NRCCM in Peking
and Testo DKD calibrating laborarory. All test results confirmed
their accuracy statements and long-term stability.
Upper electrode allows moisture to penetrate through to the dielectrical layer and is both condensate and dirt-proof
Di-electrical layer polymer, alters
di-electricity constantly with the
relative humidity
Lower
electrode
Carrier
Ceramic substrate for
mechanical protection
Connections
Special anti-corrosive design
Wireless probes offer many advantages over
traditional cable or integrated probes.
Measurements up to 65 ft. are possible. There
is no risk of damaging or tangling wires or
cables. With the testo 635, up to three wireless
probes can be read and displayed at once for
temperature and humidity measurements. The
optional, easily installed wireless module can be
retrofitted at any time in either 635 model.
Wireless probes offer versatility
The remarkable testo 635 instruments offer easy
humidity, equilibrium moisture, and pressure
dewpoint measurements in seconds. Five
probe inputs ensure maximum flexibility: 2 via
cable connection and 3 via wireless connection.
All are displayed on the large, backlit display for
easy viewing including differential and mean
values. Three funciton buttons provide access
to advanced instrument features. The optional
Testo printer provides wireless infrared printing
of all channels for on-site documentation.
Timed interval printing (ie. 1x per minute) makes
longterm monitoring easy and repeatable. The
635-2 has the added value of large memory
to 10,000 values and includes software and
computer cable.
AAddddiittiioonnaall ffeeaattuurreess::
Record up to 10,000 values
Analyze data via Testo’s Comfort
software (included)
Selectable “User profiles” can be
stored by location etc.
User-defined timed-interval cycles
(between 1 sec and 24 hrs.).
Display the dewpoint difference
between ambient air and surfaces,
(t635-2)
Precision pressure probes down to -76°F
pressure dewpoint for checking
compressed air lines, dryers, etc.
Introducing the
testo 635 Series
The 635 is rugged by design and able to stand
up to daily measuring tasks. The rubberized
housing, offers protection against dirt and
impact and will help protect your instrument.
The large illuminated display is recessed for
better protection.
The 635 is also equipped with a convenient
carrying strap plus two powerful magnets in
back that allow secure hands free operation.
Rugged enough for
everyday use
The 635 offers several options for viewing,
managing, printing and analyzing data.
Simply print out data with date and time
for conveninet and fast documenation onsite with the optional testo infrared printer
Meausure and store from 1 to over 10,000
readings and analyze them via Testo’s
ComSoft3 Compact Software (included
with the 635-2) in graphics and tables, or
export the data to a spreadsheet for further
analyses at a later time.
In addition the testo 635 can perfrom timed
interval printing from 1 minute to 24 hours.
Using its user-specified “Cycle printing”
function for long-term monitoring or
applications that require repeatable
measurements documentation is fast and
easy.
Superior data
communcation and handling
· Instrument store for 10,000 readings
· PC software for archiving and documenting measurement data
· Direct display of material moisture due to storable characteristics curves (Basis: material equilibrium moisture)
· Storage of single measurements or measurement series by measurement location
· Quick access to the most important functions via user profiles
Cyclic printing of readings on testo report printer, e.g. once per minute
testo 635-1 Advantages
testo 635-2 Advantages
· Connection up to 3 wireless probes
· Measurement of air humidity, material equilibrium moisture and pressure dew-point in pressurized air systems
· Display of dew-point distance, min, max and mean values
· Printing of data on the testo report printer
· Backlit display
· Protection type IP 54
testo 635 Common advantages
Part no. 0560 6351testo 635-1
Part no. 0563 6352testo 635-2
4.5”
Ø0.2”
Ø0.5”
Meas. range AccuracyIllustrationAbsolute pressure probes
Part no.
Absolute pressure probe 800 “H20
0638 18350 to +800
“H20
±2 “H20
Fast-action surface probe with spring
thermocouple for uneven surfaces, short-term
range to +923°F, T/C Type K
0602 03933 s-76 to +572 °F Class 2
4.5 in.
Ø .16”
Meas. range Accuracy SecIllustrationAir probes
Part no.
Rugged air probe, T/C Type K
0602 179325 s-76 to +752 °F Class 2
Meas. range Accuracy SecIllustrationSurface probes
Part no.
Temperature probe to determine U-value,
triple sensor system for measuring wall
temperature
0614 1635-4 to +160 °F Class 1
Probes
Ø0.5”
12 in.
12 in.
Ø0.5”
Meas. range AccuracyIllustrationHumidity probes
Part no.
Humidity/temperature probe
0636 9735-4 to +160 °F
0 to +100
%RH
±0.5 °F
±2 %RH (+2 to +98 %RH)
Meas. range AccuracyIllustrationPressure dewpoint probes
Part no.
Pressure dewpoint probe for measurements
in compressed air systems
0636 9835300 s
-22 to +122 °F tpd
0 to +100 %RH
±1.6 °F tpd (+32 to +122 °F tpd)
±1.8 °F tpd (41 to 32 °F tpd)
±4 °F tpd (14 to 23 °F tpd)
±5 °F tpd (-4 to 14 °F tpd)
±7 °F tpd (-22 to -4°F tpd)
Rugged humidity probe for measurements up
to +284°F, Ø 0.5, for exhaust ducts and
measuring equilibrium moisture
0636 21610 to +100 %RH
-4 to +257 °F
±2 %RH (+2 to +98 %RH)
±0.4 °F (13 to +122 °F)
±0.9 °F (remaining range)
Ø .16”
Thin humidity probe with built-in electronics,
incl. 4 attachable Teflon protection caps for
material equilibrium humidity measurement
0636 21350 to +100
%RH
-4 to +160 °F
±2 %RH (+2 to +98 %RH)
±0.4 °F (13 to +122 °F)
±0.9 °F (remaining range)
Sec
12 in.
Precision pressure dewpoint probe for
measurements in compressed air systems,
including certificate with test point -40°F tpd
0636 9836300 s
-76 to +122 °F tpd
0 to +100 %RH
±1.4 °F tpd (-23 to +122 °F tpd)
±1.8 °F tpd (14 to 23 °F tpd)
±4 °F tpd (-4 to 14 °F tpd)
±5 °F tpd (-22 to -4 °F tpd)
±7.2 °F tpd (-40 to -22 °F tpd)
Technical data testo 635
Range -328 to +2498 °F 0 to +100 %RH
Resolution
±0.5 °F (-76 to +140 °F)
±0.9% of rdg (remaining
range)
0 to 800 “H20
Accuracy
±1 digit
0.1 °F 0.1 °F 0.1 %RH 0.04 “H20
Probe type Type K (NiCr-Ni) Testo humid. sensor,
cap.
Absolute pressure
probe
-40 to +302 °F
±0.4 °F (-13 to +167 °F)
±0.7 °F (-40 to -13 °F)
±0.7 °F (+167 to +212 °F)
±0.9% of rdg (remaining
range)
NTC (Humidity probe)
Dimensions 8.6 x 3 x 1.8 in.
Weight 15 oz.
Warranty 2 years
Material/Housing ABS/TPE/Metal
Oper. temp. -4 to +122 °F
Storage temp. -22 to +160 °F
Battery life 200 hr
Battery type Alkaline, Type AA
Meas. range AccuracyWireless handles with probe head for surface measurement Sec
Wireless handle for plug-in probe heads
with T/C probe head for surface
measurement
5 s-58 to +662 °F
Short-term to +932 °F
Wireless handle:
±(0.9 °F +0.3% of rdg) (-40 to +932 °F)
±(1.3 °F +0.5% of rdg) (remaining range)
T/C probe head: Class 2
Resolution
0.1 °F (-58 to
+392 °F)
1.0 °F (remaining
range)
Pre-assembled: Wireless handles with probe head
Wireless handle for plug-in probe heads, incl. T/C adapter, approved for USA and Canada 0554 0191
T/C probe head for surface measurement, attachable to wireless handle, T/C Type K 0602 0394
915.00 MHz FSK
Radio freq.
VVeerrssiioonn
Part no.
Meas. range Accuracy Resolution
0 to +100 %RH
-4 to 160 °F
±2 %RH (+2 to +98 %RH)
±0.9 °F
0.1 %RH
0.1 °F
Wireless probes incl. humidity probe head
Wireless handle for plug-in probe heads
with humidity probe
Wireless handle for plug-in probe heads, incl. T/C adapter, approved for USA and Canada 0554 0191
Humidity probe head, attachable to wireless handle 0636 9736
915.00 MHz FSK
Radio freq.
VVeerrssiioonn
Part no.
Wireless module for upgrading instrument to wireless option
Radio probes: General technical data
Wireless module for instrument, 915.00 MHz FSK, approved for USA and Canada 0554 0190915.00 MHz FSK
Radio freq.
VVeerrssiioonn
Part no.
Wireless handle for plug-in probe heads, incl. T/C adapter, approved for USA and Canada 0554 0191915.00 MHz FSK
Radio freq.
VVeerrssiioonn
Part no.
Wireless handles, separate
Meas. range AccuracyWireless handles for attachable T/C probes Resolution
Measuring rate
0.5 s or 10 s,
adjustable on handle
Battery type
Battery life
Wireless immersion/penetration probe, TC
2 x 3V button cell (CR 2032) 2 AAA batteries
150 h (meas. rate 0.5 s)
2 months (meas. rate 10 s)
215 h (meas. rate 0.5 s)
6 months (meas. rate 10 s)
Wireless handle
Radio
transmission
Radio coverage
Rf Direct
Oper. temp. -4 to +122 °F
Storage temp. -40 to +160 °F
Up to 65 ft. (without
obstructions)
Wireless handle for attachable probe
heads incl. adapter for attaching T/C
probes
(Type K)
-58 to +1832 °F ±(1.3 °F +0.3% of rdg) (-40 to +1652 °F)
±(1.6 °F +0.5% of rdg) (remaining range)
0.1 °F (-58 to +392 °F)
1.0 °F (remaining range)
1.5”
Ø0.5”
5 in.
Ø 0.20”
Option: Wireless
Ordering information
Subject to change without notice.0986 9524/msp/si/A/07.2005
testo 635-1, humidity/temperature instrument, with battery and
calibration document
0560 6351
testo 635-2, humidity/temperature instrument with memory, PC
software and USB cable, incl., battery and calibration
document
0563 6352
Instrument Part no.
Printer and Accessories
Testo printer with wireless IRDA and infrared interface, 1 roll
of thermal paper and 4 round cell batteries
0554 0547
Part no.
Extra thermal paper for printer (6 rolls)
...legible up to 10 years
0554 0568
Basic service case for instrument and probes,
(16” x 12” x 4”)
0516 0035
Part no.
Deluxe service case for instrument, probes and
accessories, (19” x 17” x 4”)
0516 0135
External recharger incl. 4 Ni-MH rechargeable batteries
with built-in, international power adapter - 100-240 V, 300
mA, 50/60 Hz, 12 VA/instrument
0554 0610
Plug-in power supply for testo 735, testo 635, testo 435, 5
VDC 500 mA with European adapter
0554 0447
Additional accessories
Control and humidity adjustment set 11.3%RH/75.3%RH
incl. adapter for humidity probes
0554 0660
Part no.
Teflon sintered filter, (Ø 0.5 in.), for corrosive substances
Longterm high humidity ranges and high velocities
0554 0756
Stainless steel sintered cap, (Ø 0.5 in.), screws onto humidity
probe; for high velocity speeds or in “dirty” air
0554 0647
Adapter for humidity probes for surface measurements, (Ø
0.5 in.), i.e. damp walls
0628 0012
Wireless handle for RH probe incl. probe wire, for
measurement / calibration
0430 9735
ISO calibration certificate/Temperature, instr. with surface
probe; calibration points +140°F; +250°F; +360°F
0520 0071
ISO calibration certificate/Humidity, Electronic hygrometers;
calibration points 11.3%RH and 75.3%RH at +77°F
0520 0006
ISO calibration certificate/Pressure dew point
Two adjustment points -14/-40 °F tpd
0520 0136
ISO calibration certificate/Pressure
Absolute pressure; accuracy 0.1 to 0.6; 3 measuring points
distributed over meas. range (0 to 102 psi)
0520 0185
Accessories Part no.
Calibration Certificates Part no.
Transport and protection
The wireless probe records critical measurements during the storage
of products requiring precise air humidity and temperature control.
Wireless measurement of warehouse conditions
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