testo 425 Digital Hot Wire Anemometer Instruction Manual

425 Digital Hot Wire Anemometer

testo 425 – Digital hot wire anemometer 0560 0425
Instruction manual

Contents

Contents

1 2 2.1 2.2 3 4 5 5.1 6 6.1 6.2 6.2.1 6.2.2 6.2.3 6.3 6.3.1 7 7.1 7.1.1 7.1.2 7.1.3 7.1.4 7.1.5 7.1.6 7.1.7 7.2 7.2.1 7.2.2 7.2.3 7.2.4 7.2.5 7.3 8 8.1

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 ………………………………………………………………………….13 Setting the area…………………………………………………………………………14 Reading absolute pressure …………………………………………………………14 Carrying out a reset of the setting menus………………………………………14 Carrying out a reset of the measuring instrument……………………………15 Measuring ………………………………………………………………………………..15 Changing the measurement channel display …………………………………15 Freezing a reading, displaying the maximum/minimum value …………..16 Resetting maximum/minimum values……………………………………………16 Carrying out multi-point mean calculation ……………………………………..16 Carrying out continuous mean calculation……………………………………..17 Printing data ……………………………………………………………………………..18 Controls via testo Smart App ……………………………………………………19 Overview of operating controls …………………………………………………….19

Contents

8.2 8.2.1 8.2.2 8.2.3 8.3 8.3.1 8.3.2 8.3.3 8.4 8.4.1 8.4.2 8.4.3 8.4.4 8.4.5 8.5 8.6 8.7 8.7.1 8.7.2 8.8 9 9.1 9.2 10 11 11.1 11.2

App options……………………………………………………………………………… 21 Setting the language…………………………………………………………………. 21 Displaying App Info…………………………………………………………………… 21 Displaying the tutorial ……………………………………………………………….. 21 Application menus ……………………………………………………………………. 22 Selecting an application menu ……………………………………………………. 22 Setting favorites ……………………………………………………………………….. 22 Displaying information about an application …………………………………. 22 Making measuring instrument settings ………………………………………… 23 Configuring the measuring instrument menu ………………………………… 25 Setting Auto Off ……………………………………………………………………….. 26 Activating damping …………………………………………………………………… 26 Setting the Correction Factor ……………………………………………………… 27 Setting the area ……………………………………………………………………….. 27 Display of the readings ……………………………………………………………… 28 Adjusting the view…………………………………………………………………….. 28 Exporting readings……………………………………………………………………. 29 Excel (CSV) Export…………………………………………………………………… 30 PDF Export ……………………………………………………………………………… 30 Perform Firmware update ………………………………………………………….. 31 Maintaining the product ………………………………………………………….. 32 Inserting / changing batteries……………………………………………………… 32 Cleaning the instrument …………………………………………………………….. 32 Technical data for testo 425…………………………………………………….. 33 Tips and assistance………………………………………………………………… 34 Questions and answers …………………………………………………………….. 34 Accessories and spare parts………………………………………………………. 35

1 About this document
1 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.
2 Safety and disposal
2.1 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.
3

2 Safety and disposal

· Do not expose the batteries to heavy impacts, water, fire or temperatures in excess of 140 °F.
· 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!

Risk of death!

DANGER

WARNING Indicates possible serious injury.

Indicates possible minor injury.

CAUTION

CAUTION Indicates possible damage to equipment.

2.2 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

4

3 Product-specific information
3 Product-specific information
· Do not carry out measurements on live components. · Do not expose handles and feed lines to temperatures in excess of 158°F
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.
4 Intended use
The testo 425 is a compact instrument for measuring flow velocities and temperatures by means of a permanently connected flow/temperature probe (hot wire probe). It is intended for indoor use only. The product is designed for the following tasks/areas: · Volume flow measurements in ducts · Measuring flow velocities in rooms · Temperature measurement of flows The product should not be used in the following areas: · In potentially explosive atmospheres. · For diagnostic measurements in the medical field.
5

5 Product description
5 Product description
5.1 Instrument overview

1 Control keys 3 Probe Explanation of icons

2 Display 4 Battery compartment

Refer to instruction manual

CAUTION Damage to sensor possible!
– Do not touch sensor! – Close the protective sleeve after the measurement.

6

6 First steps

6 First steps
c
6.1 Inserting / changing batteries
WARNUNG Serious risk of injury to the user and/or destruction of the instrument. There is a risk of explosion if the batteries are replaced with ones that are the wrong type. – Only use non-rechargeable alkaline 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 alkaline batteries).

Observe the polarity!

+-+

3 Close the battery compartment. When not in use for a long period: Take out the 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.
7

6 First steps
6.2 Getting to know the product
6.2.1 Connecting probes
The required probes are permanently connected or integrated. It is not possible to connect any additional sensors.
6.2.2 Switching the instrument on and off
Switching on 1 Press the On/Off key (0.5 sec).
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.
6.2.3 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.
8

6 First steps
6.3 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.
9

6 First steps
6.3.1 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.
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7 Using the product

7 Using the product

7.1 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

Parameter 1 unit

5

Parameter 1 measured value display

6

Parameter 2 measured value display

11

7 Using the product

7

Parameter 2 selected unit

8

Print / key

9

Illumination / MENU/ENTER key

7.1.1 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 Bluetooth® (long press)

Setting options/comments
Switch the Bluetooth® connection on or off

Arrow left On/Off (long press)

Freeze reading (HOLD function), display maximum/minimum value.
In configuration mode: Decrease value, select option 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)

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Function MENU/ENTER
Print (long press)

7 Using the product
Setting options/comments 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 Output readings via external printer

Arrow right

Change second measurement parameter (bottom line)

In configuration mode: Increase value, select option
7.1.2 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.

7.1.3 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.

13

7 Using the product
2 Press / to set the required unit for the top line (m/s, fpm) and confirm with MENU/ENTER.
3 Press / to set the required unit for the bottom line (m3/h, l/s, cfm) and confirm with MENU/ENTER.
7.1.4 Setting the area
Configuration mode is open, “AREA” is displayed.
1 Press / to select whether the cross-sectional area is to be entered in m² or in mm² and confirm with MENU/ENTER.
2 Press / to set the cross-sectional area and confirm with MENU/ENTER.
The measuring instrument can show a maximum of 5 digits in the display (99999 mm²). Conversions from m² to mm² with a value greater than 0.09 m² are therefore not possible!
7.1.5 Reading absolute pressure
Thanks to a built-in absolute pressure sensor (measurements are taken on the measuring instrument, not on the probe head), no additional input of the air density is required.
Configuration mode is open.
1 Press / to scroll through the configuration menus until “P_ABS” (absolute pressure) is displayed.
The current ambient air pressure is displayed.
7.1.6 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: o NO: Do not carry out reset. o YES: Carry out reset. All concealed menus that were hidden via the testo Smart App are displayed again.
The instrument returns to measurement view.
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7 Using the product
7.1.7 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: o NO: Do not carry out reset. o YES: Carry out reset. The instrument is reset to the factory settings.
The instrument returns to measurement view.
7.2 Measuring
The instrument is switched on and is in the measurement view.
1 Position the probe.
The arrow mark on the probe head must point in the direction of flow.
The correct measurement value is determined by rotating the probe slightly in both directions until the maximum value is displayed. 2 Read the measured values on the display.
7.2.1 Changing the measurement channel display
1 – Switch between the display of temperature (°C, °F) and calculated volume flow (m3/h, l/s, cfm):
Press .
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7 Using the product

7.2.2 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: o Hold: frozen measured value o Max: Maximum value o Min: Minimum value o Current measuring value
7.2.3 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 is shown.
2 Hold down (approx. 2 s).
All maximum and minimum values are reset to the current reading.

7.2.4 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.

16

7 Using the product

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.

7.2.5 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.

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7 Using the product
7.3 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 lights up green).

1 Instrument name 3 Date and time of printout 5 Measurment values

2 Firmware version and serial number
4 Measuring type and measured duration
6 Measurement parameters

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8 Controls via testo Smart App
8 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.
8.1 Overview of operating controls

1 Choice of applications

3

Display of connected measuring instruments including readings

Measurement configuration (the

5

menu changes depending on the measuring instrument connected

and the application selected)

2

Switch between the views (live, graphic, table)

4 Start/stop

6

Configuration of the measuring instrument

19

8 Controls via testo Smart App
Additional symbols on the user interface of the app (not numbered) One level back Exit view Share measurement data/report Searching Favorite Deleting Further information Display report Multiple selection
The Main menu can be accessed via the icon at top left. To exit the main menu, select a menu or right-click on the guided menus. The last screen displayed is shown.
Measure Customer Memory Sensors Settings Help and Information Other applications
20

8 Controls via testo Smart App
8.2 App options
8.2.1 Setting the language
1 Click on . 2 Select Settings. 3 Select Language.
A selection list is displayed.
4 Select the required language.
The language is changed.
8.2.2 Displaying App Info
In App Info you can find the version number of the installed App.
1 Click on . 2 Select Help and Information. 3 Select Instrument information.
The version number of the app and the ID are displayed.
8.2.3 Displaying the tutorial
The tutorial guides you through the first steps in operating the testo Smart App. 1 Click on . 2 Select Help and Information.
The tutorial is displayed. In the tutorial, swipe to display the next page.
3 Click X to quit the tutorial.
21

8 Controls via testo Smart App
8.3 Application menus
8.3.1 Selecting an application menu
1 Click on .
A selection of menus for various applications is displayed.
2 Select the required application.
Your selected application is displayed.
8.3.2 Setting favorites
1 Click on .
A selection of menus for various applications is displayed.
2 Select the application you want to set as a favorite. 3 Click on .
The star is displayed in orange: .
8.3.3 Displaying information about an application
1 Click on .
A selection of applications is displayed.
2 Click on .
The information about an application is displayed.
22

8 Controls via testo Smart App

8.4 Making measuring instrument settings

The measuring instrument is connected to the testo Smart App.

1 Click on .

The main menu opens.

2

Click on Sensors.

The Sensors menu opens.

3 Click on the required measuring instrument.
Information about the model, order number, serial number and firmware version is displayed. 4 Click on the Settings tab.
– A window with settings for the respective measuring instrument opens.

In addition to the settings that can be performed on the measuring instrument, additional settings can also be made.

23

8 Controls via testo Smart App 5 Click on the blue text under a setting heading to activate or disable settings or to open an input window to enter a specific value or select a unit. For details on the settings options, see the following sub-sections.
Changes to the measuring instrument settings in the app are transferred directly to the measuring instrument. Synchronization with the app is confirmed on the measuring instrument via “SYNC DONE”.
24

8 Controls via testo Smart App
8.4.1 Configuring the measuring instrument menu
The testo Smart App can be used to set which settings menus should be available or hidden on the measuring instrument itself.
The Settings tab in the Sensors menu is open.
1 Activate Customization instrument menu and click on the blue text Change instrument menu list under the settings heading.
The Customization instrument menu dialogue opens. On the measuring instrument, the following menus can be displayed or hidden: o Setting the unit o Area o Funnel factor (testo 417 only)
25

8 Controls via testo Smart App
2 Deactivate the checkboxes for the measuring instrument menus that are no longer to be displayed on the measuring instrument itself.
The menus belonging to the deactivated entries will no longer be displayed in the measuring instrument menu after the next synchronization.
These settings can be reset via the menu reset “M.RES” and then all settings menus will be displayed on the measuring instrument again.
8.4.2 Setting Auto Off
The Settings tab is open.
1 Enable Activate Auto-off using the slider.
The measuring instrument switches off automatically if no key is pressed for 10 min.
Exception: a frozen reading is shown on the display (“Hold” is displayed).
8.4.3 Activating damping
If the readings fluctuate wildly, it is advisable to damp the readings.
The Settings tab is open.
1 Enable Activate damping using the slider.
26

8 Controls via testo Smart App
2 Click on Average of the measured values.
The window for Average of the measured values opens.
3 Enter a value between 2 and 20 measured values.
Changes to the measuring instrument settings in the app are transferred directly to the measuring instrument. Synchronization with the app is confirmed on the measuring instrument via “SYNC DONE”.
8.4.4 Setting the Correction Factor
If parts of the cross-sectional area are covered (e.g. by lattice bars), this can be corrected via the correction factor. The correction factor indicates the proportion of free space in the crosssectional area. For example: If 20% of the area is covered, the correction factor must be set to 0.8 (80% free space).
The correction factor can only be set via the testo Smart App and not directly on the measuring instrument.
The Settings tab is open.
1 Select Correction factor.
2 Enter the value for the correction factor and save.
The changes are transferred to the measuring instrument and synchronization with the app is confirmed on the measuring instrument via “SYNC DONE”.
8.4.5 Setting the area
The cross-sectional area of the measuring point can be set both via the testo Smart App and directly on the measuring instrument. The display of this setting on the measuring instrument cannot be hidden.
The Settings tab is open.
1 Select Area.
27

8 Controls via testo Smart App
2 Enter the value for the cross-sectional area and save.
The changes are transferred to the measuring instrument and synchronization with the app is confirmed on the measuring instrument via “SYNC DONE”.
8.5 Display of the readings
The available readings can be displayed in different views.
· Live view: The readings transmitted by the measuring probes can be displayed in a live view. Readings from all connected measuring probes are displayed.
· Graphic view: Up to four different readings can be displayed in graph format. Readings to be displayed can be selected by tapping on a reading above the diagram.
· Table view: In the table view, all readings are displayed in sequence according to date and time. Different readings from the individual measuring probes can be displayed by pressing .
8.6 Adjusting the view
1 Click on .
2 Select Edit view.
An overview of all measurement channels and their measurement parameters is displayed. 3 Deselect the “check mark” to hide a measuring instrument’s
measurement channel. 4 Click to select the unit of a measurement channel. 5 Click OK to confirm the settings.
28

8 Controls via testo Smart App
8.7 Exporting readings

Export Delete
1 Click on .

Report

2 Select Memory.

3 Click on Select measurement.

29

8 Controls via testo Smart App

8.7.1 Excel (CSV) Export
1 Click on .
A selection of export options is displayed.
2 Click on Start export.
A selection of sending/export options is displayed.
3 Select the required sending/export options.

8.7.2 PDF Export

1

Click on Report.

A selection window is displayed.

2 If required, activate the Create PDF with all readings button.

3 Click on Create.

For measurements, please be aware that the option Create PDF with all readings is only possible up to 30 pages, due to the resulting file size and number of pages. In the testo DataControl software, however, PDF reports can be created for all measurements without any restrictions.
A report containing all the information is created. A selection window is displayed. The report can be sent via e-mail or
Bluetooth®.
4 Click on E-mail or Bluetooth®.
The report will be sent.
c

30

8 Controls via testo Smart App

8.8

Perform Firmware update
Ensure that the option for Enable update for connected instruments in Instrument Information is always enabled.

If a new firmware is available for your measurement instrument, an update notification is shown after connecting the instrument with the testo Smart App.
1 Click Start Update to perform the update.
If you click Later, the Update notification is shown again during the next connection.
During the instrument update the Bluetooth connection must not be disconnected. The update needs to be performed completely and takes approx. 5-10 minutes depending on the used smartphone.
31

9 Maintaining the product

After the update the measuring instrument is restarting.
The firmware can be checked in the instrument menu or via the app.
A restart of the testo Smart App is recommended after the instrument update.

9 Maintaining the product
c
9.1 Inserting / changing batteries
WARNUNG Serious risk of injury to the user and/or destruction of the instrument. There is a risk of explosion if the batteries are replaced with ones that are the wrong type. – Only use non-rechargeable alkaline 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 alkaline batteries).

Observe the polarity!

+-+

3 Close the battery compartment. When not in use for a long period: Take out the batteries.
9.2 Cleaning the instrument
1 If the housing of the instrument is dirty, clean it with a damp cloth. Do not use any aggressive cleaning agents or solvents! Mild household cleaning agents and soap suds may be used.

32

10 Technical data for testo 425

10 Technical data for testo 425
· Adjustment conditions for flow probes: Adjustment in free jet Ø 350 mm, reference pressure 1013 hPa, based on testo reference Laser Doppler Anemometer (LDA).
· Low flow velocities may result in greater measurement uncertainties during humidity and temperature measurement! The probe should be switched on outside a duct under the following conditions: Ambient temperature: 68°F Flow: approx. 0 fpm.
Collapse the telescope after use and do not constrict with the cable. Start with the telescopic links closest to the handle.

Feature Measurement parameters
Accuracy
Resolution Measuring range Operating temperature Storage temperature Operating humidity IP class Level of contamination Max. operating altitude Nominal output Battery type Battery life

Value
m/s, fpm °C, °F m³/h, cfm, l/s ±(5.91 fpm + 4% of m.v.) (0 to 3,937 fpm) ±(98 fpm + 5% of m.v.) (3937.1 to 5,905 fpm)
±0.9 °F
0.01 fpm 0.1 °F 0.01 to 5,905 fpm -4 to +122 °F -4 to +122 °F (instrument) -4 to +158 °F (probe) -4 to +122 °F
0 to 80 %RH / For indoor use only
IP20
PD2
6,525 ft above sea level
2 W @ 4,5 V DC
3 x 1.5 V AA battery (included in the scope of delivery) >35 h

33

11 Tips and assistance

Feature Dimensions
Weight

Value
Measuring instrument: 5.3 x 2.4 x 1.1 in Probe: Length 7.1in, Ø 0.30 in Cable length 5 ft. 0.6 lbs

11 Tips and assistance

11.1 Questions and answers

Question

Possible cause

Possible solution

is displayed (top right on the display)
Instrument switches itself off

Instrument battery is almost spent
· Auto Off function is switched on

Replace instrument battery
· Switch off Auto Off function

· Remaining battery

· Change the battery.

capacity is insufficient

Display responds sluggishly Display: —–
Display: OOOOO
Display: UUUUU
Display: BT Fail

Ambient temperature is very low

Increase ambient temperature

Sensor error

Please contact your dealer or Testo Customer Service.

Permissible measuring Keep within the permissible range has been exceeded measuring range

Permissible measuring Keep within the permissible range has been undershot measuring range

Bluetooth connection

· Check Bluetooth®

could not be established

connections.

· Restart measuring instrument, restart testo Smart App.

Display: Print Fail Printout could not be performed successfully

· Check Bluetooth® connections, switch off and then on again if necessary.

· Switch printer off and then on again.

Display: Probe Fail Probe damage

Please contact your dealer or Testo Customer Service.

34

11 Tips and assistance

Question

Possible cause

Possible solution

Display: OTA Fail Display: APP Lost

The update process “over the air” of the measuring instrument could not be completed successfully.
Connection to the testo Smart App was interrupted. Keys are locked for 3 s.

Restart the measuring instrument and testo Smart App and check the Bluetooth® connection.
Restart the measuring instrument and testo Smart App and check the Bluetooth® connection.

If we have not been able to answer your question: please contact your local dealer or Testo Customer Service. See the back of this document or the www.testo.com/service-contact web page for contact details.

11.2 Accessories and spare parts

Description

Order no.

Bluetooth®/IRDA printer

0554 0621

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

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Testo SE & Co. KGaA Celsiusstr. 2 79822 Titisee-Neustadt Germany Phone: +49 (0)7653 681-0 E-mail: info@testo.de www.testo.com
0970 9425 en 01 – 10.2022

References

• testo.com/service-contact

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