TESTO 535 User manual

testo 535 –Digital CO2meter
0560 0535
Instruction manual

Contents
Contents
About this document ...........................................................................3
Safety and disposal..............................................................................3
Security..................................................................................................3
Disposal .................................................................................................4
Product-specific information...............................................................5
Intended use.........................................................................................5
Product description .............................................................................6
Instrument overview...............................................................................6
First steps.............................................................................................7
Inserting / changing batteries .................................................................7
Getting to know the product ...................................................................8
Connecting probes.................................................................................8
Switching the instrument on and off .......................................................8
Switching the display illumination on and off..........................................8
Establishing a Bluetooth®connection.....................................................9
Establishing a Bluetooth®connection to the testo Smart App..............10
Using the product...............................................................................11
Controls on the measuring instrument..................................................11
Implementing settings ..........................................................................12
Opening configuration mode ................................................................13
Setting the unit .....................................................................................14
Setting alarm thresholds.......................................................................14
Setting the alarm sound .......................................................................14
Displaying temperature and pressure...................................................15
Carrying out a reset of the setting menus.............................................15
Carrying out a reset of the measuring instrument.................................15
Measuring ............................................................................................16
Freezing a reading, displaying the maximum/minimum value..............16
Resetting maximum/minimum values...................................................17
Carrying out multi-point mean calculation ............................................17
Carrying out continuous mean calculation............................................18
Printing data.........................................................................................18
Controls via testo Smart App............................................................19
Overview of operating controls.............................................................19

Contents
App options..........................................................................................21
Setting the language............................................................................21
Displaying App Info..............................................................................21
Displaying the tutorial ..........................................................................21
Application menus ...............................................................................22
Selecting an application menu.............................................................22
Setting favourites.................................................................................22
Displaying information about an application ........................................22
Making measuring instrument settings ................................................23
Configuring the measuring instrument menu.......................................25
Setting Auto Off ...................................................................................26
Activating damping ..............................................................................27
Configuring alarms...............................................................................27
Display of the readings........................................................................28
Adjusting the view................................................................................28
Exporting readings...............................................................................29
Excel (CSV) Export..............................................................................30
PDF Export..........................................................................................30
Maintaining the product....................................................................31
Inserting / changing batteries...............................................................31
Cleaning the instrument.......................................................................31
Technical data for testo 535 .............................................................32
Tips and assistance........................................................................... 33
Questions and answers.......................................................................33
Accessories and spare parts ...............................................................34

1 About this document
3
About this document
The instruction manual is an integral part of the instrument.
Keep this documentation to hand so that you can refer to it when necessary.
Always use the complete original instruction manual.
Please read this instruction manual through carefully and familiarize yourself
with the product before putting it to use.
Hand this instruction manual on to any subsequent users of the product.
Pay particular attention to the safety instructions and warning advice in order
to prevent injury and damage to the product.
Safety and disposal
Security
General safety instructions
Only operate the product properly, for its intended purpose, and within the
parameters specified in the technical data.
Do not apply any force.
Do not operate the instrument if there are signs of damage to the housing or
connected cables.
Dangers may also arise from objects to be measured or the measuring
environment. Always comply with the locally valid safety regulations when
carrying out measurements.
Do not store the product together with solvents.
Do not use any desiccants.
Only perform maintenance and repair work on this instrument that is
described in this documentation. Follow the prescribed steps exactly when
doing the work.
Use only original spare parts from Testo.
Batteries
Improper use of batteries may cause the batteries to be destroyed, or lead to
injury due to current surges, fire or escaping chemicals.
Only use the batteries supplied in accordance with the instructions in the
instruction manual.
Do not short-circuit the batteries.
Do not take the batteries apart and do not modify them.

2Safety and disposal
4
Do not expose the batteries to heavy impacts, water, fire or temperatures in
excess of 60 °C.
Do not store the batteries in the proximity of metal objects.
In the event of contact with battery acid: rinse affected areas thoroughly with
water, and if necessary consult a doctor.
Do not use any leaky or damaged batteries.
Warnings
Always pay attention to any information denoted by the following warnings.
Implement the precautionary measures specified!
DANGER
Risk of death!
WARNING
Indicates possible serious injury.
CAUTION
Indicates possible minor injury.
CAUTION
Indicates possible damage to equipment.
Disposal
Dispose of faulty rechargeable batteries and spent batteries in accordance
with the valid legal specifications.
At the end of its useful life, deliver the product to the separate collection
point for electric and electronic devices (observe local regulations) or return
the product to Testo for disposal.
WEEE Reg. No. DE 75334352

3 Product-specific information
5
Product-specific information
Do not carry out measurements on live components.
Do not expose handles and feed lines to temperatures in excess of 70°C
unless they are expressly approved for higher temperatures. Temperature
specifications on probes/sensors refer only to the measuring range of the
sensor system.
Only open the measuring instrument if this is expressly described in the
documentation for the purposes of maintenance or servicing.
Intended use
The testo 535 is a handy, robust measuring instrument for recording ambient
CO2values. It is used for risk prevention.
Fields of application are, for example
Evaluation of the indoor climate
Heating systems with room air-dependent operation
Ventilation systems
The product should not be used in the following areas:
In potentially explosive atmospheres.
For diagnostic measurements in the medical field.

5Product description
6
Product description
Instrument overview
1
Control keys
2
Display
3
Probe
4
Speaker for alarm sound
5
Battery compartment
Explanation of icons
Refer to instruction manual

6 First steps
7
First steps
Inserting / changing batteries

The instrument is switched off.
1
Open the battery compartment (on the back of the instrument) via the
snap lock.
2
Insert or replace batteries (3 x AA
batteries).
Observe the polarity!
3
Close the battery compartment.
When not in use for a long period: Take out the (rechargeable)
batteries.
Symbol explanation
Do not allow children under 6 years of age to play with batteries.
Do not throw batteries in the trash.
Do not charge batteries.
Do not place batteries near fire.
Batteries are recyclable.
+ -+

6First steps
8
Getting to know the product
Connecting probes
The required probes are permanently connected or integrated. It is not possible
to connect any additional sensors.
Switching the instrument on and off
Switching on
1
Press and hold down (2 sec) the On/Off key.

Measurement view is opened:
The current reading is displayed or ----- lights up if no reading is
available.
Switching off
1
Press and hold down (2 sec) the On/Off key.

The display turns off.
Switching the display illumination on and
off

The measuring instrument is switched on.
1
Press and hold down (2 sec) the MENU/ENTER key.

The display illumination is switched on or off.

6 First steps
9
Establishing a Bluetooth®connection
The instrument can be connected to the testo Smart App via
Bluetooth®connection

The measuring instrument is switched on.

To enable the Bluetooth®connection
for the first time, press and hold
(approx. 2 sec) the ◄key.
While the instrument is trying to
establish a Bluetooth®connection,
the icon flashes on the display.
Bluetooth®remains enabled until it is
disabled manually by pressing and
holding (approx. 2 sec) the ◄key.
The measuring instrument saves the
Bluetooth®setting and, depending
on the configuration, starts up with
Bluetooth®enabled or disabled.

6First steps
10
Establishing a Bluetooth®connection to the
testo Smart App
To establish a connection via Bluetooth®, you need a
tablet or smartphone with the Testo Smart App already
installed on it.
You can get the App for iOS instruments in the App Store
or for Android instruments in the Play Store.
Compatibility:
Requires iOS 13.0 or later/Android 8.0 or later,
requires Bluetooth®4.2.

Bluetooth®is enabled in the measuring instrument.
1
Open the testo Smart App.

The app automatically searches for Bluetooth®devices in the vicinity.
2
In the Sensors menu, check whether the required instrument is
connected.

If necessary, switch the instrument to be connected off and on again
to restart the connection module.

When the testo Smart App is connected to the measuring instrument,
the icon appears on the measuring instrument display.
The measuring instrument automatically synchronizes its date and
time settings with the testo Smart App.
Once connected successfully, the current measured value from the
measuring instrument appears on the app screen in the Live view.

7 Using the product
11
Using the product
Controls on the measuring instrument

The instrument is switched on.

The testo Smart App is installed on the smartphone and connected
to the instrument via Bluetooth®.

Settings and controls are implemented either on the instrument or via
the app.
If the measuring instrument is connected to the testo Smart App,
settings can only be made via the app. The measuring instrument then
remains in the measurement view and other menus, e.g. Settings,
cannot be opened.
1
On/Off / MODE/END key
2
Bluetooth®/ ◄key
3
Battery indicator
4
Display of measured CO2concentration
5
Selected unit
6
Print / ►key
7
Illumination / MENU/ENTER key

7Using the product
12
Implementing settings
Selecting, opening and setting functions
1
Press the relevant key to select the functions
Secondary assignment (long press)
All keys with a grey corner have a secondary assignment, which can be
selected by pressing and holding the key for a longer time (2 sec).
Adjustable functions
Ensure correct settings: all settings are transferred immediately. There
is no Cancel function.
Function
Setting options/comments
Bluetooth®(long press)
Switch the Bluetooth®connection on
or off
Arrow left
Freeze reading (HOLD function),
display maximum/minimum value.
In configuration mode:
Decrease value, select option
On/Off (long press)
Switches the instrument on or off
MODE/END
Select or end multi-point or continuous
mean calculation.
Display illumination (long press)
OFF (display illumination not active) or
ON (display illumination active)

7 Using the product
13
Function
Setting options/comments
MENU/ENTER
Open configuration mode
Start continuous measurement /
record multi-point readings
(Operation also possible directly on
measuring instrument if it is connected
to the app)
In configuration mode:
Confirm input
Print (long press)
Output readings via external printer
Arrow right
In configuration mode:
Increase value, select option
Opening configuration mode

The instrument is switched on and is in the measurement view.
1
Press MENU/ENTER until the display changes.

The instrument is now in configuration mode.

Press MENU/ENTER to switch to the next function. You can leave
configuration mode at any time. To do this, press MODE/END until the
instrument has changed to the measurement view. Any changes that
have already been made in configuration mode will be saved.

7Using the product
14
Setting the unit

Configuration mode is open, “UNITS” is displayed.
1
Press ◄/ ►to choose between metric (“METR”) and imperial
(“IMPER”) units of measurement and confirm with MENU/ENTER.

The currently set unit flashes.
2
Press ◄/ ►to set the required unit and confirm with MENU/ENTER.
Setting alarm thresholds

Configuration mode is open, “ min” is displayed.
1
Press ◄/ ►to set the lower alarm threshold value and confirm with
MENU/ENTER.

“max” is displayed.
2
Press ◄/ ►to set the upper alarm threshold value and confirm with
MENU/ENTER.
Setting the alarm sound

Configuration mode is open, “ ” is displayed.
1
Press ◄/ ►to enable/disable the alarm sound (“ON” / “OFF”) and
confirm with MENU/ENTER.

7 Using the product
15
Displaying temperature and pressure
To calculate the CO2concentration, the measuring instrument needs the
ambient temperature and the ambient air pressure.
These two parameters are measured by the measuring instrument, but are not
output as separate readings; they are only displayed in the settings menu.

Configuration mode is open.
1
Press ◄/ ►to scroll through the configuration menus until “T_AMB”
(ambient temperature) is displayed.

The current ambient temperature is displayed.
2
Press ◄/ ►to scroll through the configuration menus until “P_ABS”
(absolute pressure) is displayed.

The current ambient air pressure is displayed.
Carrying out a reset of the setting menus

Configuration mode is open, “M. RES” (menu reset) is displayed.
1
Press ◄/ ►to select the required option and confirm with
MENU/ENTER:
oNO: Do not carry out reset.
oYES: Carry out reset. All concealed menus that were hidden
via the testo Smart App are displayed again.

The instrument returns to measurement view.
Carrying out a reset of the measuring
instrument

Configuration mode is open, “RESET” is displayed.
1
Press ◄/ ►to select the required option and confirm with
MENU/ENTER:
oNO: Do not carry out reset.
oYES: Carry out reset. The instrument is reset to the factory
settings.

The instrument returns to measurement view.

7Using the product
16
Measuring

The instrument is switched on and is in the measurement view.
1
Place the measuring instrument into the position in which the
measurement is to be carried out.
IMPORTANT
The probe contains sensitive visual components. Please handle the probe
with care.
Strong vibrations alter the factory calibration. Testing of measurement values
at fresh air 350 to 450 ppm CO2(urban air up to 700 ppm CO2).
Avoid dew on the probe, otherwise long-term stability will be impaired. If
there is dew on the probe, this can lead to higher CO2measurement values.
If the ambient temperature changes (change of measuring location, e.g.
indoors/outdoors), the sensor/probe requires an acclimatization phase of a
few minutes.
After the measuring instrument is switched on, there is a sensor warm-up
phase of approx. 30 s.
The CO2concentration in the sensor requires approx. 60 s to adjust to the
environment. Gently waving the probe reduces the acclimatization time.
Keep the probe as far away from your body as possible. This avoids any
influences due to the CO2content of the air you breathe.
Freezing a reading, displaying the
maximum/minimum value
The current reading can be frozen. The maximum and minimum values since
the last time the instrument was switched on in the standard view or during a
multi-point or continuous measurement can be displayed.
1
Press ◄several times until the desired value is displayed.

The following are displayed in turn:
oHold: frozen measured value
oMax: Maximum value
oMin: Minimum value
oCurrent measuring value

7 Using the product
17
Resetting maximum/minimum values
The maximum/minimum values of all channels can be reset to the current
reading.
1
Press ◄several times until Max or Min lights up.
2
Hold down ◄(approx. 2 s).

All maximum and minimum values are reset to the current reading.
Carrying out multi-point mean calculation
1
Press MODE/END.

flashes.

The number of readings recorded is displayed in the upper line, while
the current reading is displayed in the lower line.
2
To record readings (in the desired quantity):
Press MENU/ENTER (several times).
3
To end measurement and calculate the mean value:
Press MODE/END.

and flash.
The number of measured values and the calculated multi-point mean
value are displayed.
4
To switch back to the measuring view:
Press MODE/END.

7Using the product
18
Carrying out continuous mean calculation
1
Press MODE/END twice.

flashes.

The elapsed measuring time (mm:ss) is displayed in the upper line,
while the current reading is displayed in the lower line.
2
Start measurement:
Press MENU/ENTER.
3
To interrupt/continue measurement:
Press MENU/ENTER each time.
4
To end measurement and calculate the mean value:
Press MODE/END.

and flash.
The measurement period and the calculated continuous mean value
are displayed.
5
To switch back to the measuring view:
Press MODE/END.
Printing data

A testo Bluetooth®/IRDA printer (order no. 0554 0621) is connected
via Bluetooth and switched on.
When first setting up a connection between the testo measuring
instrument and the testo Bluetooth®/IRDA printer, the initialization
phase can last up to 30 seconds.
1
Press and hold ►to transfer the data to the printer.

Data is printed out (LED on the printer flashes green).

8 Controls via testo Smart App
19
Controls via testo Smart App
If the measuring instrument is connected to the testo Smart App, it is primarily
operated via the app. The measuring instrument remains in the measurement
view and settings menus cannot be opened on the measuring instrument.
Overview of operating controls
1
Choice of applications
2
Switch between the views (live,
graphic, table)
3
Display of connected measuring
instruments including readings
4
Start/stop
5
Measurement configuration (the
menu changes depending on the
measuring instrument connected
and the application selected)
6
Configuration of the measuring
instrument