Testo 435 Operating Manual

Multifunction measuring instrument

testo 435

Bedienungsanleitung de

Instruction manual en

Contents

General notes ....................................................34

1. Safety instructions..............................................36

2. Intended purpose ..............................................37

3. Product description............................................38

3.1 Display and control elements ........................................38

3.2 Interfaces ......................................................................40

3.3 Voltage supply ..............................................................40

4. Commissioning ..................................................41

5. Operation ..........................................................42

5.1 Connecting a probe ......................................................42

5.2 Switching on/off ............................................................42

5.3 Display light ..................................................................43

6. Setting the instrument ........................................44

6.1 Configuration menu ......................................................44

6.1.1 Profile..............................................................................44

6.1.2 Units ..............................................................................45

6.1.3 Device ............................................................................45

6.1.4 Probe..............................................................................47

6.1.5 Language........................................................................50

6.2 Main menu....................................................................50

6.2.1 Memory (435-2 / -4 only) ................................................52

6.2.2 Measuring program (435-2 / -4 only) ..............................53

6.2.3 Mean ............................................................................54

6.2.4 P = 0 (435-3 / -4 only) ....................................................54

6.2.5 Calculation ......................................................................55

Parameter / Area ............................................................56

6.2.6

6.2.7 Cyclical Print (435-1/-3 only) ..........................................57

7. Measuring ..........................................................58

8. Care and maintenance ......................................61

9. Questions and answers......................................62

10. Technical data ....................................................63

11. Accessories / spare parts ..................................65

General notes34

General notes

This chapter provides important advice on using this documentation.

The documentation contains information that must be applied if the product is
to be used safely and efficiently.

Please read this documentation through carefully and familiarise yourself with
the operation of the product before putting it to use. Keep this document to
hand so that you can refer to it when necessary.

Identification

Representation Meaning Comments

Warning advice: Warning! Read warning advice carefully and take the precautionary measures

indicated! Serious physical injury could occur if you do not take the
precautionary measures indicated.

Warning advice: Caution! Read warning advice carefully and take the precautionary measures

Note Offers helpful tips and information.

±, 1, 2 Objective Denotes the objective that is to be achieved via the steps described.

 Condition A condition that must be met if an action is to be carried out as

i, 1, 2, ... Step Carry out steps. Where steps are numbered, you must always follow

Text Display text Text appears on the instrument display.

Button

- Result Denotes the result of a previous step.

º Cross-reference Refers to more extensive or detailed information.

Control button Press the button.
Function button Press the button.

indicated! Slight physical injury or damage to equipment could occur
if you do not take the precautionary measures indicated.

Where steps are numbered, you must always follow the order given!

described.

the order given!

General notes 35

Short form

This document uses a short form for describing operating steps (e.g. calling up
a function).

Example: Calling up the “Instrument data” function
Short form: Device ¬¬Inst.data ¬ .

1) (2) (3) (4)

(

OKOK

Steps required:

1 Press / to select the Device function.
2 Confirm selection with .
3 Press / to select the Inst.data function.
4 Confirm selection with .

OK

OK

de

enfresitptsvnl????

1. Safety instructions36

1. Safety instructions

This chapter gives general rules which must be followed and observed if the
product is to be handled safely.

Avoid personal injury/damage to equipment

i Do not use the measuring instrument and probes to measure on or near live

parts.

i Never store the measuring instrument/measuring cells together with solvents

and do not use any desiccants.

Product safety/preserving warranty claims

i Operate the measuring instrument only within the parameters specified in the

Technical data.

i Always use the measuring instrument properly and for its intended purpose.

Do not use force.

i Do not expose handles and feed lines to temperatures in excess of 70 °C

unless they are expressly permitted for higher temperatures. Temperatures
given on probes relate only to the measuring range of the sensors.

i Open the instrument only when this is expressly described in the

documentation for maintenance or repair purposes.
Carry out only the maintenance and repair work that is described in the
documentation. Follow the prescribed steps when doing so. For safety
reasons, use only original spare parts from Testo.

Ensure correct disposal

i Take faulty rechargeable batteries/spent batteries to the collection points

provided for them.

i Send the product back to Testo at the end of its useful life. We will ensure

that it is disposed of in an environmentally friendly manner.

1. Safety instructions 37

Instruments with radio module 915.00MHz FSK

Warning: Changes or modifications not expressly approved by the party responsible for compliance could void
the user's authority to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part
15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following measures:

· Reorient or relocate the receiving antenna.

· Increase the separation between the equipment and receiver.

· Connect the equipment into an outlet on a circuit different from that to which the receiver is needed.

· Consult the dealer or an experienced radio/TV technician for help.
Operation is subject to the following two conditions:

· this device may not cause harmful interference, and

· this device must accept any interference received, including interference that may cause undesired operation.

2. Intended purpose

This chapter gives the areas of application for which the product is intended.

Use the product only for those applications for which it was designed. Ask
Testo if you are in any doubt.

testo 435 is a compact, multifunction measuring instrument for measuring
temperature, humidity and flow rate.

The product was designed for the following tasks/applications:

· Measuring room climate

· Regulating and inspecting ventilation and air-conditioning installations

· Measuring the pressure dew point in compressed air systems

· Assessing the quality of room air with the help of the IAQ probe

The product should

· Areas at risk of explosion.

· Diagnostic measurements for medical purposes.

not

be used in the following areas:

de

enfresitptsvnl????

3. Product description38

3. Product description

This chapter provides an overview of the components of the product and their
functions.

3.1 Display and control elements

Overview

 Infrared, USB interface
 Display (light can be activated)
 Control buttons
 Rear: Battery and radio module compartment, holding

magnets

Strong magnets
Damage tto oother iinstruments!

i

Keep a safe distance from products which
could be damaged by magnetism (e.g.
monitors, computers, pacemakers, credit
cards).

 Probe socket(s)

Button functions

Button Functions

Function button (3x): The function depends on the button assignment
at the time

Change display of the 1
In configuration mode: Increase value, select option

Change display of the 2
In configuration mode: Decrease value, select option

Print data
435-1/-3 only: If the Cyclical Printing function is activated, the
programmed measuring program is started.

Switch instrument on, switch display light on/off;
switch instrument off (press and hold)

st

reading line

nd

reading line

3. Product description 39

Function buttons (Function dependant on profile and setting)

Button Functions

Open (main) menu

OK

ESC

ACTHold

/ Hold value/display current measurement value

Reset

Mean

Measp

Start

End

Save

Turb

Area

P=0

Enter confirmation
Cancel

Reset max./min. values to current measurement value
Open menu item “Multi-point mean calculation“
Open menu item “Measuring program“ (435-2/-4 only)

435>

Start test series (435-2/-4 only)
End test series (435-2/-4 only), End Cyclical Print (435-1/ -3 only)
Save values (435-2/-4 only)
Activate “Turb“ test series (435-2/-4 only with attached turbulence probe)
Open menu item “Area”
Zero internal pressure sensor (435-3/-4 only)

Important displays

Display Meaning

Battery capacity (only for operation by battery/rechargeable battery):

· 4 segments in the battery symbol are lit: Instrument battery is fully charged

· No segments in the battery symbol are lit: Instrument battery is almost spent

(flashing) Print function: Data are sent to the printer

435-3/-4 only: Measurement channel differential pressure (internal sensor)

, Measurement channel no.: Channel 1, channel 2.

If a measurement channel is a radio channel, the radio symbol lights up as well as the
measurement channel no.

de

enfresitptsvnl????

3. Product description40

3.2 Interfaces

Infrared interface

Measurement data can be sent to a Testo printer via the infrared interface on
the head of the instrument.

USB interface

The mains unit (accessory part) can be connected to the head of the
instrument via the USB interface to power the instrument.

Instruments with a memory: Measurement/instrument data can be exchanged
with a PC via the USB interface.

Probe socket(s)

Plug-in measuring probes can be connected via the probe socket(s) on the
base of the instrument. The instrument is a HighPower device, possibly an
additional USB-Hub is required!

Radio module (accessory part)

Radio probes may only be used in countries in which they have been Type
Approved (see application information of the radio probe).

Up to three radio probes can be connected via the radio module.

3.3 Voltage supply

Voltage is supplied via three mignon batteries (included in delivery) or
rechargeable batteries or through a mains unit (accessory part). It is not
possible to charge rechargeable batteries in the instrument.

When operating the instrument with the mains unit, insert batteries in order
to avoid switching off the instrument in case of a power interruption.

4. Commissioning 41

4. Commissioning

This chapter describes the steps required to commission the product.

Inserting bbatteries/rechargeable bbatteries aand aa rradio mmodule ((accessory

²

part):

1 Undo the two screws on the rear of the instrument and lift off the battery

compartment cover.

2 Insert batteries/rechargeable batteries (3x mignon) into the battery

compartment. Observe the polarity!

3 Push the radio module (accessory part) into the radio module

compartment until it engages in place. Note the guide groove.

4 Replace the battery compartment cover, press down and secure by

tightening the two screws.

de

enfresitptsvnl????

5. Operation42

5. Operation

This chapter describes the steps that are executed frequently when using the
product.

5.1 Connecting a probe

Plug-in probes

Plug-in probes must be connected before the measuring instrument is
switched on so that they are recognised by the instrument.

i Insert the connector of the probe into the probe socket of the measuring

instrument.

Radio probes

Radio probes may only be used in countries in which they have been Type
Approved (see application information of the radio probe).

A radio module (accessory part) is required for the use of radio probes. The
radio module must be connected before the measuring instrument is switched
on so that it is recognised by the measuring instrument.

Each radio probe has a probe ID (identification number) which must be set in
configuration mode.

º See chapter PROBE, p. 47.

5.2 Switching on/off

Switching tthe iinstrument oon:

²

i Press .

- Measurement view is opened: The current reading is displayed, or

---- lights up if no reading is available.
Instruments with a memory: The activated location is displayed
(topmost line).

-oor-
The instrument is switched on for the first time, a reset was carried out or

the power supply was interrupted for a lengthy period of time:

- The Language function is opened.

º See the chapter

LANGUAGE, p. 50.

Switching tthe iinstrument ooff:

²

i Press and hold (for approx. 2s) until the display goes out.

5.3 Display light

Switching tthe ddisplay llight oon/off:

²

 The instrument is switched on.
i Press .

5. Operation 43

de

enfresitptsvnl????

6. Setting the instrument44

6. Setting the instrument

This chapter describes the steps that are required in order to adapt the
measuring instrument for specific measuring tasks.

6.1 Configuration menu

The basic settings for the measuring instrument are performed in the
configuration menu.

Opening tthe cconfiguration mmenu:

²

 The instrument is in measurement view.
i Press and hold (approx. 2s) until config. is displayed.

Press to go one menu level back. To leave the configuration menu,

press several times until the instrument changes to measurement view.

6.1.1 Profile

ESC

ESC

The instrument has predefined measurement profiles that are tailored to
specific areas of application.

The profile setting influences the following points in measurement mode:

· Assignment of the function buttons

· Number of predefined functions

· Structure of the main menu

All functions are available in the standard profile. In the application-specific
measurement profiles, the available functions are reduced to only those that are
needed to ensure speedier access.

Setting aa pprofile:

²

 The configuration menu is open, config. is displayed.

1 Profile ¬ .
2 Select the desired profile with / and confirm with .

OK

OK

6. Setting the instrument 45

6.1.2 Units

Predefined systems and individual setting options:

Parameter ISO system US system Individual setting options

Temperature °C °F °C, °F
Pressure hPa inchH2O mbar, Pa, hPa, kPa, inchH2O
Velocity m/s fpm m/s, fpm
Volumetric flow rate m³/h ft³/min m³/h, l/s, ft³/min
Length mm inch mm, inch
Power kW BTU/h kW, BTU/h, TONS

Setting uunits:

²

 The configuration menu is open, config. is displayed.

1 Units ¬ .
2 Press / ISO/US (to set the system) or a parameter (to set

individually) and confirm with .

3 Set the system of units or the desired unit with / and confirm

with .

OK

OK

OK

6.1.3 Device

Instrument data

Displaying iinstrument ddata:

²

 The configuration menu is open, config. is displayed.

1 Device ¬¬Inst.data ¬ .

- The firmware version and the serial number of the instrument are
displayed.

OKOK

de

enfresitptsvnl????

Date/Time

Setting tthe ddate/time:

²

 The configuration menu is open, config. is displayed.

1 Device ¬¬date/time ¬ .
2 Use / to set the value for year and confirm with .
3 Set the other values as described in step 2.

OKOK

OK

6. Setting the instrument46

Battery type

To ensure that the battery capacity is displayed correctly, the battery type used
must be set.

Setting tthe bbattery ttype:

²

 The configuration menu is open, config. is displayed.

1 Device ¬¬Bat-type ¬ .
2 Press / Battery or ReBa and confirm with .

OKOK

OK

Auto OFF

If Auto OFF is switched on, the instrument switches itself off automatically after
10min if no button is pressed. Exception: Cyclical printing (instruments without
a memory) or a measuring program (instruments with a memory) is active.

Switching AAuto OOFF oon/off:

²

 The configuration menu is open, config. is displayed.

1 Device ¬¬Auto OFF ¬ .
2 Press / to select On or Off and confirm with .

OKOK

OK

Reset

When a reset is carried out, the instrument is reset to the default settings, all
settings/data are deleted. Exception: Language, Date/Time.

Resetting:

²

 The configuration menu is open, config. is displayed.

1 Device ¬¬reset ¬ .
2 Reset with or cancel the reset with .

OKOK

ESCOK

Setting min. / max. printing function

If pr MinMaxAuto is activated, minimum and maximum values are also printed
with the measurement readings.

Switching ooff ppr MinMax:

²

 The configuration menu is open, Config. is displayed.

1 Device ¬¬pr MinMax ¬ .
2 Choose On or Off with / and confirm with .

OKOK

OK

6. Setting the instrument 47

K-factor

The querying of the K-factor (correction factor for areas) when entering the
parameter „Area“.can be switched on/off.

º See chapter PARAMETER/AREA, p. 56.

Switching KK-ffactor oon/off:

²

 The configuration menu is open, config. is displayed.

1 Device ¬¬K-factor ¬ .
2 With / , select On or Off and confirm with .

OKOK

OK

Num holes

The querying of the number of holes (number of measurement points) in the
calculation of a multi-point mean value can be switched on/off. The number of
holes is required to allocate the readings to the number of measurement points
for later evaluation via the PC software.

º See Chapter M

Switching nnumber oof hholes oon/off:

²

 The configuration menu is open, config. is displayed.

1 Device ¬¬Num holes ¬ .
2 With / , select On or Off and confirm with .

EAN, p. 54 and

MEASURING, p. 58.

OKOK

OK

de

enfresitptsvnl????

6.1.4 Probe

RadioC

Radio probes may only be used in countries in which they have been Type
Approved (see application information of the radio probe).

A radio module (accessory part) is required for the use of radio probes. The
instrument can establish a connection with a maximum of three radio probes.

Each radio probe has a probe ID (RF ID). This consists of the last 3 digits of the
serial no. and the position of the slide switch (H or L) in the radio probe.

Setting uup aa rradio pprobe:

²

 A radio module (accessory part) is inserted in the instrument.

º See chapter COMMISSIONING, p. 41.
 The configuration menu is open, config. is displayed.
 The radio probe is switched on and the transfer rate is set to 2 readings

per second (see the advice on using the radio probe).

6. Setting the instrument48

1 Probe ¬¬RadioC ¬ .
2 Press / to select the desired channel no. for the radio probe (P. 1 ,

P. 2 or P. 3 ) and confirm with .

OKOK

OK

- The instrument searches for switched-on radio probes in the receiving
range.

- The probe IDs of the radio probes found are displayed.

If no radio probes were found, this may be because of the following:

· The radio probe is not switched on or the battery of the radio probe is
spent.

· The radio probe is outside the range of the measuring instrument.

· Sources of interference are influencing the radio transmission (e.g.
reinforced concrete, metal objects, walls or other barriers between
transmitter and receiver, other transmitters of the same frequency,
strong electromagnetic fields).

i If necessary, rectify the possible causes of the fault in radio

transmission.

Alternatively, the probe ID can also be entered manually.

MAN

i ¬ Press / to enter the probe ID.

3 Press / to select the probe that is to be assigned to the chosen

channel no.

4 Assign the radio probe to the chosen channel no. with or exit the

function with , without changing the probe configuration.

ESC

OK

Humidity probe calibration (435-2/-4 only)

This function is only available if a humidity probe is plugged in.
The calibration values can be reset to the default settings (Reset). A 2-point

calibration can be performed.

Resetting tthe ccalibration vvalues:

²

 The configuration menu is open, config. is displayed.

1 Probe ¬¬Calibr. ¬ .
2 Press / to select Reset and confirm by pressing twice.

OKOK

OK

- The calibration values are reset to the default settings.

6. Setting the instrument 49

Calibrating:

²

 The configuration menu is open, config. is displayed.

1 Probe ¬¬Calibr. ¬ .

OKOK

2 Press / to select calibration point P1 or P2 and confirm by

pressing twice.

OK

3 Put the humidity probe into the reference medium and wait for the

equalisation period to elapse.

- The current humidity reading and the calibration point (nominal value) are
displayed.

4 Start the calibration menu with .
5 Save calibration with or cancel calibration with .

OK

ESCOK

P internal (435-3/-4 only)

The internal pressure sensor can be switched on/off.

Switching tthe iinternal ppressure ssensor oon/off:

²

 The configuration menu is open, config. is displayed.

1 Probe ¬¬P intern ¬ .
2 Press / On or Off and confirm with .

OKOK

OK

de

enfresitptsvnl????

Te-Type

The probe characteristic curves stored in the instrument can be set for the
probe type used.

Setting pprobe ttype:

²

 The configuration menu is open, Config. is displayed.

1 Probe ¬¬Te-Type ¬ .
2 Select the desired probe type with / and confirm with .

OKOK

OK

Adjustment

The function is only available when an absolute pressure probe is attached.
The display value for the measurement of abolute pressure.

Carrying oout aadjustment:

²

 The configuration menu is open, config. is displayed.

1 Probe ¬¬Adjustm. ¬ .
2 With / , set the adjusted value and confirm with .

OKOK

OK

6. Setting the instrument50

Pressure

The function is only available when an absolute pressure probe is attached.
You can set whether the absolute air pressure (measured with an absolute

pressure probe) or the barometric air pressure (calculated from the measured
absolute pressure and the input of the altitude above sea level).

º For the input of abs alt. for the calculation of the barometric air pressure, see

chapter PARAMETER/AREA, p. 56.

Setting mmeasurement pparameter:

²

 The configuration menu is open, config. is displayed.

1 Probe ¬¬Pres. ¬ .
2 With / , select the desired measurement parameter and confirm

OK

with .

OKOK

6.1.5 Language

Setting tthe llanguage:

²

 The configuration menu is open, config. is displayed.

1 Language ¬ .
2 Select the desired language with / and confirm with .

OK

OK

6.2 Main menu

Settings by which the measuring instrument can be adapted to the particular
measuring task are performed in the main menu.

The instrument has predefined measurement profiles that are tailored to
specific areas of application.

º See the chapter PROFILE, p. 44.

The profile setting influences the number of available functions and the
structure of the main menu.

The method described in this chapter for calling up the functions in the main
menu relates to the Standard profile setting. If a different profile is set, the
method for calling up individual functions may change or the function may
not be available in that particular profile. Some functions are only available
when a probe is connected or a wireless probe is switched on and
registered.

6. Setting the instrument 51

Menu overview testo 435-1/-3

Profile menu items Function

Standard P = 0 (nur 435-3) Zero internal pressure sensor

Area Set form, cross-section area, K-factor
Calc. De/activate volume flow, differential temperature, dewpoint

temperature, psychrometric temperature calculation;
435-3 additionally; De/activate flow calculation

Parameter Set reference pressure, abs. altitude;

435-3 additionally; Set reference temperature/humidity.

cyc. Print De/activate cycle printing

Ductm. P = 0 (nur 435-3) Zero internal pressure sensor

Velocity (nur 435-3) De/activate flow calculation
Vol. De/activate volume flow calculation
Parameter (nur 435-3) Set reference pressure, abs. altitude, P-factor, Set reference

temperature/humidity.
Pres. (nur 435-1) Set reference pressure
cyc. Print De/activate cycle printing

Menu overview testo 435-2/-4

Profile menu items Function

Standard Memory Info, Activate/set measurement locality, print report, delete store

Meas. Prog Set/ de/activate measurement program
Mean Time/point mean calculation
Calc. De/activate volume flow, differential temperature, dewpoint tempera-

ture, psychrometric temperature, Enthalpy calculation; Set heat

transfer coefficient alpha

435-3 additionally; De/activate flow calculation
P = 0 (nur 435-4) Zero internal pressure sensor
Parameter Set reference pressure, abs. altitude, Set area form/cross-section;

435-4 additionally: Set reference temperature/humidity.

Ductm. P = 0 (nur 435-4) Zero internal pressure sensor

Memory Info, Activate/set measurement locality, print report, delete store
Velocity (nur 435-4) De/activate flow calculation
Vol. De/activate volume flow calculation
Parameter Set reference pressure, abs. altitude

435-4 additionally: Set reference temperature/humidity.

IAQ Mean Time mean calculation

Pres. Set reference pressure
Memory Info, Activate/set measurement locality, print report, delete store
abs alt. Set abs. altitude
P = 0 (nur 435-4) Zero internal pressure sensor

de

enfresitptsvnl????

6. Setting the instrument52

Opening tthe mmain mmenu:

²

 The instrument is in measurement view.
i Press .

- Menu is displayed.
Press to go one menu level back. To leave the main menu, press

ESC

ESC

several times until the instrument changes to measurement view.

6.2.1 Memory (435-2/-4 only)

Info

The free memory space is displayed

Location

The active location can be changed. Up to 99 locations can be created. The
numerical location designations (01-99) can be changed into any text (max.
10 characters) using the PC software.

Changing aan aactive llocation:

²

 The main menu is open, Menu is displayed.

1 Memory ¬¬Location ¬ .
2 Press / to select the location to be activated and confirm with

OK

.

OKOK

Protocol

Saved measurement protocols can be printed out on a Testo printer (accessory
part) via the infrared interface.

Printing aa mmeasurement pprotocol:

²

 The main menu is open, Menu is displayed.

1 Memory ¬¬Protocol ¬ .
2 Press / to select the measurement protocol that is to be printed.
3 Press to start printing out the measurement protocol.

OKOK

Delete

The entire memory with all measurement protocols can be cleared.

6. Setting the instrument 53

Clearing tthe mmemory:

²

 The main menu is open, Menu is displayed.

1 Memory ¬¬Delete ¬ .
2 Press to clear the entire memory.

OK

OKOK

6.2.2 Measuring program (435-2/-4 only)

A measuring program can be programmed and activated/deactivated:

Designation Description

Off Measuring program switched off: Readings can be stored manually
AUTO Automatic measuring program: The measuring cycle (min. 1s) and the number of

Turb Automatic measuring program for measuring turbulence (only if a turbulence probe

Deactivating aa mmeasuring pprogram:

²

 The main menu is open, Menu is displayed.

1 Meas.Prog ¬ .
2 Press / to select Off and confirm with .

- The instrument returns to measurement view.

readings can be set freely.

is available and plugged in): The measuring cycle (1/5s) and duration (180s) are
preset.

OK

OK

de

enfresitptsvnl????

Programming aand aactivating tthe AAUTO mmeasuring pprogram:

²

 The main menu is open, Menu is displayed.

1 Meas.Prog ¬ .
2 Press / to select AUTO and confirm with .

OK

OK

The measuring cycle is set in the order: hours /minutes/seconds.

3 Press / to set the measuring cycle in hours and confirm with

OK

.

4 Perform the setting for minutes and seconds as described in step 3.
5 Press / to set the number of readings and confirm with .

- The instrument returns to measurement view.

OK

6. Setting the instrument54

Activating tthe TTURB mmeasuring pprogram:

²

The measuring program for measuring turbulence is only available if a
turbulence probe is plugged in.

 The main menu is open, Menu is displayed.

1 Meas-Prog ¬ .
2 Press / to select Turb and confirm with .

OK

OK

- The instrument returns to measurement view.

6.2.3 Mean

The menu item Mean value calculation is only available in the instrument
testo 435-2/-4. In the instrument testo 435-1/-3, the function Mean value
calculation is called up with the function button .

Mean

For carring out Mean value calculation see chapter Measuring, p. 58.

6.2.4 P = 0 (435-3/-4 only)

The internal pressure sensor can be zeroed.

The measurement values can be falsified by a change in the position of the
measuring instrument. After zeroing, the position of the measuring instru­ment must not be changed. Carry out zeroing before every measurement in
order to compensate faulty positioning or long-term zero-point drift. Zeroing
is only possible in a range of 0...25% of the measuring range.

Zeroing tthe iinternal ppressure ssensor:

²

 The main menu is open, Menu is displayed.
i P=0¬ .

OK

6. Setting the instrument 55

6.2.5 Calculation

If calculation is switched on, additional parameters with calculated values can
be displayed from the readings of
additional measurement channels in measurement view.

Particular measurement channels must be available in order to perform the
calculation.
Additional calculation parameters need to be set for some calculated variables.

º See the chapter PARAMETER, p. 56.

The following variables can be calculated:

· Flow velocity (435-3/-4 only)

· Volumetric flow rate

· Dew point (below 0°Ctd/32°Ftd frost point temperatures are displayed)

· Psychrometric temperature

· Enthalpy (Heating/cooling performance of assemblies)

The heat transfer coeffiient (alpha) required for the calculation of the U-value can
be set.

It is also possible to calculate the difference between two measurement
channels (Delta). This is only possible if the selected measurement channels
have the same unit.

Activating/deactivating rreading ccalculation:

²

 The main menu is open, Menu is displayed.

1 Calc. ¬ .
2 Press / to select the variable that is to be activated/deactivated

and confirm with .

3 Press / to select On (= activated) or Off (= deactivated) and

confirm with .

OK

OK

OK

one

probe. These are then displayed as

de

enfresitptsvnl????

Activating ddifferential ccalculation ((delta):

²

 The instrument is in measurement view.

Differential calculation is performed with the parameters that are shown on
the display.

1 Press and to select the measurement channels from which the

difference is to be calculated.

2 Press to open the main menu.
3 calc. ¬ .

OK

6. Setting the instrument56

4 Press / to select Delta and confirm with .

OK

6.2.6 Parameter/Area

Some calculated variables relate to particular reference values (ambient
conditions or factors for certain probes). These can be entered by means of
calculation parameters.

Parameters used for calculating variables:

Parameters Calculated measuring variables

Temp. (reference temperature) Flow velocity, volumetric flow rate (for measurement with a

(435-3/-4 only) pitot tube)

Humid. (reference humidity) Flow velocity, volumetric flow rate (for measurement with a

(435-3/-4 only) pitot tube)

Pres. (reference pressure) Flow velocity, volumetric flow rate (for measurement with a

Area (cross-section area) Volumetric flow rate
P-factor (pitot tube factor) Flow velocity and volumetric flow rate (for measurement with a

(435-3/-4 only) pitot tube)
abs alt. Barometric air pressure

Setting pparameters ((not tthe ““Area” pparameter):

²

 The main menu is open, Menu is displayed.

1 Parameter ¬ .

OK

2 Press / to select the parameter that is to be set and confirm with

OK

.

3 Press / to set the value and confirm with .

pitot tube or hot wire probe), heating/cooling performance (enthalpy)

OK

6. Setting the instrument 57

Setting tthe ““Area” pparameter / Activating sshape:

²

Five areas can be stored for the “Area” parameter. Three shapes are defined
in the default setting (one rectangles: edge length a and b, one circle:
diameter d, any shaped area: cross-section area A). The dimensions of the
areas can be adapted in the instrument. It is possible to reassign the shapes
using the PC software (435-2/-4 only).
When K-factor activated (see chapter

DEVICE, p. 45): An offset factor is stored

for each area. If parts of an area are covered (e.g. grilles on ventilation
openings), this can be calculated out using the offset factor. What must be
indicated is the free part of the area (20% covered --> 80% free area -->
offset factor 0.8).
For measurements made at outlets and volume flow regulators with defined
differential pressure measurement points, a component-specific correction
factor (k-Vol) prescribed by the manufacturer can be entered instead of the
area input.
For measurements at ventilation outlets with a funnel the parameter Funnel
must be activated. The funnel set (order no. 0563 4170) consists of a funnel
for measurements at plate outlets (200 x 200mm) and a funnel for
measurements at ventilation outlets (330 x 330mm) in combination with the
testo 435 and with the 100mm vane probe 0635 9435.

de

enfresitptsvnl????

 The main menu is open, Menu is displayed.

1 testo 435-2/-4 only: Parameter ¬ .
2 Press / to select Area and confirm with .
3 Press / to select the shape by which the area is to be described

and confirm the input with .

4 Press / to set the parameter(s) and confirm each one with .

OK

OK

OK

OK

- The settings are applied and the last shape to be set is activated.

6.2.7 Cyclical Print (435-1/-3 only)

The Cyclical Print function can be activated/deactivated. A measuring program
for cyclical printing can be programmed. This enables readings (up to 999) to
be printed in a defined measuring cycle (min. 1min). The readings are sent to a
Testo printer.

6. Setting the instrument58

Activating ccyclical pprinting/programming aa mmeasuring pprogram:

²

 The main menu is open, Menu is displayed.

1 cyc.Print ¬ .
2 Press / to select Off (deactivated) or On (activated) and confirm

with . The measuring cycle is set in the order: minutes/hours.

3 Press / to set the measuring cycle in minutes and confirm with

OK

.

4 Perform the setting for hours as described in step 3.
5 Press / to set the number of readings and confirm with .

OK

OK

OK

- The instrument returns to measurement view.

- The measurement series is programmed and cyclical print can be
started with .

7. Measuring

This chapter describes the steps that are required to perform measurements
with the product.

Particular probes must be plugged in or switched on and registered (radio
probes) according to the variable that is to be measured.

Some probes require a warming-up phase until they are ready to measure.
For some variables additional calculation parameters have to be set if correct

measurements are to be obtained.

º See PARAMETER, p. 56.

For the calculation of the U-value, please refer to the documentation included
with the U-value temperature probe (0614 1635).

Required for the calculation of the heating/cooling performance of assemblies:

· A vane probe (for determining the volume flow) must be connected.

· 2 wireless humidity probes (for determining enthalpy at the input and output
of the assembly and for calculating tightness).

· The parameter pressure (for the calculation of tightness) must be entered.

· The calculation factor enthalpy must be activated. The enthalpy is integrated
in the calculation of performance, an enthalpy value cannot be displayed..

· The wireless humidity probe allocated to radio channel 1 must be positioned
next to the vane probe, as its readings are automatically used to calculate
the mass flow.

7. Measuring 59

When measuring ambient CO, observe:

· The ambient CO probe must be situated in fresh air (CO-free) during the
zeroing phase.

· Cigarette smoke influences the measurement by more than 50ppm. The
breathed air of a smoker influences the reading by approx. 5ppm.

· The flow impact of the gas influences the measurement accuracy. Frontal
impact on the sensor leads to higher measurement values. The best
measurement results are acheived with a slight movement of the probe back
and forth.

Taking aa mmeasurement:

²

 The instrument is in measurement view.
 The measuring program AUTO or TURB is not activated (435-2/-4 only).

i Put the probe in position and take the readings.

Changing tthe uupper mmeasurement cchannel lline ddisplay:

²

i Press .

Changing tthe llower mmeasurement cchannel lline ddisplay, sshowing tthe

²

max./min. vvalue oof tthe vvariable iin tthe uupper mmeasurement cchannel lline:

i Press .

- The following are displayed in consecutive order:

· Available measurement channels

· Maximum value of the variable in the upper display line

· Minimum value of the variable in the upper display line

· Lower measurement line not shown

Resetting mmax./min. vvalues:

²

The minimum or maximum values of all measurement channels are reset.

1 Press several times until the maximum or minimum value is displayed.
2 Reset the max./min. values with .

Reset

de

enfresitptsvnl????

Holding rreadings:

²

i Press .
i Press to change back to displaying the actual reading.

Saving rreadings ((435-22/-44 oonly):

²

i Press .

Hold

Act

Save

- A measurement protocol with the readings of all available measurement
channels is created for the active location.

7. Measuring60

Timed mmean ccalculation:

²

The mean is formed as a moving mean value and individual values are not
displayed.

1 435-1/-3: Press , 435-2/-4: ¬ Mean ¬ .
2 Timed ¬ .
3 Press to start mean calculation.

Press to stop mean calculation.

Multi-ppoint mmean ccalculation:

²

OK

Start

End

OKMEAN

The mean is formed as a moving mean value.

1 435-1/-3: Press , 435-2/-4: ¬ Mean ¬ .
2 Multi-poi ¬ .
3 Press to include readings.

Press to stop mean calculation.

OK

Pick

End

OKMEAN

Only testo 435-2/-4 in the profile Duct measurement and with hole query
activated (see chapter

4 With / , enter number of holes and confirm with .

Running tthe AAUTO oor TTURB mmeasuring pprogram ((435-22/-44 oonly):

²

 The instrument is in measurement view and the AUTO or TURB measuring

DEVICE, p. 45):

OK

program is activated.

1 Start the measuring program with .

Start

- The measuring program starts. The readings are recorded.

- The measuring program continues to run until cancelled with or

End

until the end criterion is met (number of readings is reached or time has
expired when measuring turbulence ).

- The readings are saved in a protocol.

Cyclical pprinting ((435-11/-33 oonly):

²

 The instrument is in measurement view and Cyclical Print is activated.
i Start cyclical printing with .

- The measuring program starts. The readings are transmitted to the
Testo printer.

- Measurement continues to run until cancelled with or until the

End

end criterion is met (number of readings is reached).

8. Care and maintenance 61

8. Care and maintenance

This chapter describes the steps that help to maintain the functionality of the
product and extend its service life.

Cleaning tthe hhousing:

±

i Clean the housing with a moist cloth (soap suds) if it is dirty. Do not use

aggressive cleaning agents or solvents!

Changing tthe bbattery/rechargeable bbattery:

±

 Instrument is switched off.

1 Undo the two screws on the rear of the instrument and lift off the battery

compartment cover.

2 Remove spent batteries/rechargeable batteries and insert new

batteries/rechargeable batteries (3x mignon) into the battery
compartment. Observe the polarity!

3 Replace the battery compartment cover and tighten the two screws.

de

enfresitptsvnl????

9. Quenstions and answers62

9. Questions and answers

This chapter gives answers to frequently asked questions.

Question Possible causes Possible solution

lights up · Instrument battery is almost spent. · Replace instrument battery.

Instrument switches ·
off automatically. · Residual capacity of the battery is too low. · Replace battery.

----- · Probe is not plugged in. · Switch instrument off, connect probe

Display:

uuuuu · Permitted measuring range · Keep to permitted measuring range.

Display:

ooooo · Permitted measuring range · Keep to permitted measuring range.

Display:

Instrument settings are · Power supply was interrupted for a · Re-enter instrument settings.
no longer correct long time.

If we are unable to answer your question, please contact your dealer or Testo
Customer Service. Contact details can be found on the guarantee card or on
the Internet under

Auto Off function is switched on. · Switch function off.

· Radio contact with radio probe is · Switch radio probe on, if necessary
interrupted. register radio probe again.

· Probe break. · Please contact your dealer

was undershot.

was exceeded.

www.testo.com

.

and switch instrument back on again.

or Testo Customer Service.

10. Technical data 63

10. Technical data

Measuring ranges and accuracies

Parameter/Probe type Measuring range Accuracy (± 1 Digit) Resolution

Temperature/NTC -50...+150°C ±0.2°C (-25.0...+74.9°C) 0.1°C

-58...+302°F ±0.4°F (-13.0...+166.9°F) 0.1°F

Temperature/ -200...+1370°C (Type K) ±0.3°C (-60.0...+60.0 °C) 0.1°C
Type K/ T -200...+400°C (Type T) ±0.5% of reading (rest of range)

Relative humidity/ 0...+100%RH Depends on probe 0.1%RH
humidity probe

Flow velocity/vane Vane 16mm: Depends on probe 0.1m/s

Flow velocity/ 0...+20m/s Depends on probe 0.01m/s
hot wire probe

Pressure/absolute 0...+2000hPa Depends on probe 0.1hPa
pressure probe

CO2/IAQ probe 0...+10000ppm Depends on probe 1ppm
Lux/Lux probe 0...100000Lux Depends on probe 1Lux

(testo 435-2/-4 only)
Pressure/internal 0...+25hPa ±0.02hPa (0...+2hPa) 0.01hPa

differential pressure probe (Overload: 200hPa) ±1% of reading (rest of range)
(testo 435-3/-4 only)

CO/Ambient CO probe 0...500ppm ±5ppm (0...100ppm)

1)

at 10...30°C, outside this range additionally ±0.2% of reading/°C

-328...+2498°F (Type K) ±0.6°F (-76.0...+140.0°F) 0.1°F

-328...+752°F (Type T) ±0.5% of reading (rest of range)

0.6...+40m/s
Vane 60mm: Depends on probe 0.01m/s

0.25...+20m/s
Vane 100mm: Depends on probe 0.01m/s

0.3...+20m/s

±0.4°C (-50.0...-25.1°C)
±0.4°C (+75.0...+99.9°C)
±0.5% of reading (rest of range)

±0.8°F (-58.0...-13.1°F)
±0.8°F (+167.0...+211.9°F)
±0.5% of reading (rest of range)

1)

±5% of reading (101...500ppm)

1)

1ppm

de

enfresitptsvnl????

10. Technical data64

Further instrument data

Characteristic Value

Probe connections 1x Omega TC socket, 1x Mini-DIN socket, radio module (accessory),

Memory 435-2/-4 only: max. 99 locations, up to 10000 readings (depending on number of

Battery life 160h (typical for vane measurement)
Power supply 3x mignon battery (included in delivery)/rechargeable battery or mains unit

Housing material ABS/TPE/metal
Protection class IP65
Dimensions 225 x 74 x 46mm
Operating temperature range -20...+50°C
Storage temperature -30...+70°C
Measuring rate 2/s
EC Directive 2004/108/EEC
Warranty Instrument: 2 years

435-3/-4 only: 2x pressure nipple

locations, protocols, channels)

(accessory part)

11. Accessories/spare parts 65

11. Accessories/spare parts

This chapter gives important accessory and spare parts for the product.

Name Part no.

Probes

Water-proof immersion/penetration probe,TC type K 0602 1293
Water-proof surface probe with widened measurement tip for smooth surfaces,TC type K 0602 1993
Robust affordable air probe, TC type K 0602 1793
Vane probe, 1000mm diameter 0635 9435
Vane probe, 60mm diameter, telescopic to max. 910mm 0635 9335
Vane probe, 16mm diameter, telescopic to max. 890mm 0635 9335
Humidity/temperature probe, 12mm diameter (testo 435-2/-4 only) 0636 9735
Handle for humidity/temperature probe, for connection to the measuring instrument,

including probe cable, for measures/calibrates of humidity probehead (testo 435-2/-4 only) 0430 9735
Absolute pressure probe 2000hPa 0638 1835
Pressure dew point probe for measurements in compressed air systems (testo 435-2/-4 only) 0636 9835
Hot wire probe for m/s and °C, probehead 7.5mm diameter, telescopic to max. 820mm 0635 1025
IAQ probe to assess Indoor air quality, CO“,humidity, temperature and

absolute pressure measurement 0632 1535
Thermal flow probe with integrated temperature and humidity measurment,

12mm diameter,with telescope max. 745mm 0635 1535
Comfort probe for degree of turbulence measurement, with telescopic handle and stand,

fulfills DIN EN 13779 requirements (testo 435-2/-4 only) 0628 0109
Lux probe, probe for measuring luminous intensity (testo 435-2/-4 only) 0635 0545
Ambient CO probe 0632 1235

Miscellaneous

Plug-in mains unit, 5VDC, 500mA with European plug 0554 0447
Funnel set sonsisting of funnel for plate outlets and funnel for vents. 0563 4170
External recharger incl. 4 Ni-MH rechargeable batteries with built-in, international plug,

100-240V, 300mA, 50/60Hz, 12VA/instrument 0554 0610

de

enfresitptsvnl????

For a complete list of all accessories and spare parts, please refer to the
product catalogues and brochures or look up our website: www.testo.com