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testo 420 · Flow Hood
Instruction manual
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
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1 Contents
1 Contents
1 Contents ................................................................................................... 3
2 Safety and the environment .................................................................... 4
2.1. About this document ........................................................................ 4
2.2. Ensure safety ................................................................................... 5
2.3. Protecting the environment .............................................................. 5
3 Specifications .......................................................................................... 5
3.1. Use .................................................................................................. 6
3.2. Technical data ................................................................................. 6
3.2.1. Bluetooth module ............................................................................................. 6
3.2.2. General technical data ..................................................................................... 6
4 Product description ............................................................................... 10
4.1. Overview........................................................................................ 10
4.1.1. Measurement setup ....................................................................................... 10
4.1.2. Overview of testo 420 .................................................................................... 11
5 First steps .............................................................................................. 13
6 Using the product .................................................................................. 15
6.1. Switching Bluetooth® on and off.................................................... 15
6.2. Settings for the measurement ........................................................ 16
6.2.1. Damping (Gliding Average) ............................................................................ 16
6.2.2. Hood Calibration ............................................................................................ 16
6.2.3. Zeroing Interval (Automatic Zeroing) .............................................................. 16
6.3. Volume flow measurement setup .................................................. 17
6.4. Measuring ...................................................................................... 19
6.4.1. Volume flow measurement............................................................................. 19
6.4.2. Pitot tube measurement ................................................................................. 20
6.4.3. Differential pressure measurement ................................................................ 21
6.5. Saving ........................................................................................... 21
6.6. Transferring measurement data to the PC .................................... 22
7 Maintaining the product ........................................................................ 23
7.1. Cleaning the instrument ................................................................. 23
8 Tips and assistance ............................................................................... 23
8.1. Questions and answers ................................................................. 23
Accessories and spare parts ................................................................... 24
9 Authorizations ........................................................................................ 26
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2 Safety and the environment
Representation
Explanation
2 Safety and the environment
2.1. About this document
Use
> Please read this documentation through carefully and
familiarize yourself with the product before putting it to use. Pay
particular attention to the safety instructions and warning advice
in order to prevent injuries and damage to the products.
> Keep this document to hand so that you can refer to it when
necessary.
> Hand this documentation on to any subsequent users of the
product.
Symbols and writing standards
Warning advice, risk level according to the
signal word:
Warning! Serious physical injury may occur.
Caution! Slight physical injury or damage to
the equipment may occur.
> Implement the specified precautionary
measures.
Note: Basic or further information.
1. ...
2. ...
Action: more steps, the sequence must be
followed.
> ... Action: a step or an optional step.
- ... Result of an action.
Menu Elements of the instrument, the instrument
display or the program interface.
[OK] Control keys of the instrument or buttons of
the program interface.
... | ... Functions/paths within a menu.
“...” Example entries
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2.2. Ensure safety
> Do not operate the instrument if there are signs of damage at
the housing, mains unit or feed lines.
> Do not perform contact measurements on non-insulated, live
parts.
> Do not store the product together with solvents. Do not use any
desiccants.
> Carry out only the maintenance and repair work on this
instrument that is described in the documentation. Follow the
prescribed steps exactly. Use only original spare parts
from Testo.
> Dangers may also arise from the systems being measured or
the measuring environment: Note the safety regulations valid in
your area when performing the measurements.
2.3. Protecting the environment
> Dispose of faulty rechargeable batteries/spent batteries in
accordance with the valid legal specifications.
> At the end of its useful life, send the product to the separate
collection for electric and electronic devices (observe local
regulations) or return the product to Testo for disposal.
3 Specifications
3 Specifications
The testo 420 is used for volume flow measurements (main
application), Pitot tube measurements and pressure measurements
for air conditioning and ventilation systems. Thanks to its
interchangeable flow hoods, the testo 420 can be used for air inlets
and outlets of various sizes.
With the additional App (Android/iOS), the readings can be
conveniently displayed on a tablet or smartphone, and in addition a
measurement can be started, stopped and saved via the App.
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3 Specifications
3.1. Use
3.2. Technical data
The use of the wireless module is subject to the regulations and
stipulations of the respective country of use, and the module may only
be used in countries for which a country certification has been granted.
The user and every owner has the obligation to adhere to these
regulations and prerequisites for use, and acknowledges that the resale, export, import etc. in particular in countries without wireless
permits, is his responsibility.
3.2.1. Bluetooth module
Feature Values
Bluetooth Range >20 m (free field)
Bluetooth type LSD Science & Technology Co., Ltd
L Series BLE module (08 May 2013) based
on TI CC254X chip
Qualified Design ID B016552
Bluetooth radio
class
Bluetooth company 10274
Class 3
3.2.2. General technical data
Feature Values
Measurement
parameters
Measuring cycle 1/sec
Interfaces Probe interface Mini DIN
6
Temperature: °C / °F
Humidity: %RH / %rF / td°C / WB°C
Flow velocity : m/s / ft/min
Volume flow: m³/h / cfm / l/s
Pressure (absolute pressure): hPa / mbar / kPa
Pressure (differential pressure): Pa / hPa /
mbar / mmH
Micro USB
O / inH2O
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3 Specifications
Feat
ure Values
Measuring ranges Temperature: -20 to +60 °C / -4 to 140 °F
Humidity: 0 to 100% RH
Wet bulb temperature: -20 to +60 WB°C
Dew point: -76 to +60 td°C
Flow velocity: 0 to 14 m/s /
0 to 2750 ft/min
Volume flow: 40 to 4000 m³/h /
25 to 2300 cfm / 11 to 1100 l/s
Pressure (absolute pressure):
700 to 1100 hPa
Pressure (differential pressure): 120 to +120 Pa
Resolution Temperature: 0.1 °C / 0.1°F
Humidity: 0.1% RH
Flow velocity: 0.01 m/s
Volume flow: 1 m³/h / 1 cfm
Pressure (absolute pressure): 0.1 hPa /
0.1 mbar / 0.01 kPa
Pressure (differential pressure): 0.001 Pa /
0.00001 hPa / 0.00001 mbar / 0.0001 mm
H2O / 0.000001 inH2O
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3 Specifications
no accuracy specification since
Feature Values
Accuracy
(nominal temperatur
e 22°C/71.6°F)
Temperature
coefficient
Response time t90 Temperature: approx. 45 s
Temperature: ±0.5 °C (0 to +70 °C) / ±0.8 °C
(-20 to 0 °C)
Humidity: ±1.8% RH +3% of m.v. at +22 °C
(5 to 80% RH) (longer high humidity application
can result in a temporary sensor drift)
Flow velocity:
calculated variable
Volume flow 1: ±3% of m.v. +12 m³/h at
+22 °C, 1013 hPa (85 to 3500 m³/h)
±3% +7 cfm (50 to 2,100 cfm)
Error absolute pressure compensation:
±0.04% of m.v. / hPa deviating from 1013 hPa
Pressure (absolute pressure): ± 3 hPa
Pressure (differential pressure): ±2% of m.v.
+ 0.5 Pa (at 22°C, 1013 hPa)
Error absolute pressure compensation:
±0.04% of m.v. / hPa deviating from 1013 hPa
Humidity: ± 0.03% RH / K (deviating from
22°C, in the range 0 to 60 °C)
Volume flow: ± 0.02% of m.v. / K
(deviating from 22 °C, in the range 0 to 60 °C)
Pressure (absolute pressure): ± 0.02% of
m.v. / K (deviating from 22 °C, in the range
0 to 60 °C)
Pressure (differential pressure): ± 0.02% of
m.v. / K (deviating from 22 °C, in the range
0 to 60 °C)
Humidity: approx. 15 s
Flow velocity: approx. 1 s
Volume flow: approx. 1 s
Pressure (absolute pressure): approx. 1 s
Pressure (differential pressure): approx. 1 s
1
All accuracy specifications apply under laboratory conditions or with necessary
compensation (correction factor) with the standard hood 610x610 mm. Minimum
outlet size of 360x360 mm
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3 Specifications
Feature Values
Operating and
ambient conditions
Storage temperature: -20 to +60 °C / -4 to
140 °F
Operating temperature: -5 to +50 °C/+23 +122°F
Humidity: 0 to 100% RH
Pressure range: 800 to 1100 hPa
Housing /
measurement setup
Measuring instrument housing material: ABS
Body material: PP
Standard hood material: Nylon
Measuring instrument dimensions:
150x85x35 mm
Body dimensions: 510x456x148 mm
Dimensions of measurement setup with
standard hood: 610x970x610 mm
Weight of entire measurement setup
approx. 2900 g
Power supply
4 x 1.5 V rechargeable/non-rechargeable
batteries
Type AA / alkaline manganese, mignon
Battery lifetime: approx. 40h (eroing interval
10 seconds, display illumination off,
Bluetooth off)
Display Type: Dot matrix
Dimensions: 3.5 inches
Directives,
EU guideline: 2014/30/EU
standards and tests
Warranty Duration: 2 years
Warranty terms: see website
www.testo.com/warranty
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4 Product description
4 Product description
4.1. Overview
4.1.1. Measurement setup
1 Volume flow hood (standard hood 610x610 mm)
2 Actuator for manual measurement
3 Measuring instrument testo 420
4 Measurement base with differential pressure cross
5 Integrated flow straightener
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4.1.2. Overview of testo 420
1 Battery compartment, on rear of the instrument
2 Display
3 Control keys
4 Probe socket Mini-DIN (only for use on the measurement base)
5 Micro-USB port
6 Connection for pressure measurement
Instrument status icons:
Icon Meaning
Battery capacity
Bluetooth
4 Product description
/ /
Measuring mode:
Pressure measurement, Pitot tube, volume
flow (air pressure from above into the hood /
suction outlet)
Actual
Actual volume flow:
The current ambient conditions are used to
calculate the volume flow. The actual
barometric pressure is measured with the
internal sensor. In applications with volume
flow hood, the temperature is measured by
the integrated temperature/humidity sensor,
with Pitot tube measurement the actual
temperature needs to be input manually.
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4 Product description
Icon Meaning
Standard
K-factor
Pitot Tube factor
(P-factor)
Control keys
Key Function
Standard volumetric flow:
The standard settings for temperature and
barometric pressure (21 °C / 1013 hPa in
accordance with the standard conditions of
the NIST, National Institute of Standards and
Technology) are used to calculate the volume
flow.
Factor by which the current reading is
multiplied. Depends on which outlet
measurements are being taken at.
The Pitot tube factor for Pitot tubes is
generally the same and must be entered:
• Pitot tubes from Testo: 1.00
• Pitot tubes from other manufacturers: the
Pitot tube factor can be found in the
instruction manual or you should ask your
supplier.
Menu
[►, ■]
[ESC]
[►, ▲, ▼,◄]
[ ]
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Holds / starts / stops a measurement
Switches to the previous view / to the
measurement view
Saves the measured values
Navigation within the menu
Confirms a selection
Switch instrument on/off (press and hold
down)
Switch illumination on/off (press briefly)
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5 First steps
►, ▲, ▼,◄
Inserting batteries/rechargeable batteries
1. Open the battery compartment.
2. Insert the batteries or rechargeable batteries (scope of delivery
includes 4x 1.5V Type AA/ LR6).
3. Close the battery compartment.
When not in use for a long period of time, take the
batteries/rechargeable batteries out.
Implementing settings
1. Press to access the menu.
2. Select the menu item you require using ►, ▲, ▼, ◄.
Key functions
Display Explanation
5 First steps
Change parameter, select unit
Confirm input
2
1. Menu Level 2. Menu Level 3. Menu Level
Application Flow Hood K-factor
Pitot tube Duct
Pressure only --
Measuring Program Single Measurment --
Continous
Measurement
2
Maximum of 15 minutes, measuring cycle 1 second
Actual/Standard
Pitot tube factor
Pitot Temperature
Actual/Standard
--
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5 First steps
measurement (nur für
1. Menu Level 2. Menu Level 3. Menu Level
Continous/Punctual
measuring duration3
Staurohr)
Memory New Folder --
T420 folder --
Display Volume Flow on/off
Diff.Pressure on/off
Temperature on/off
Velocity on/off
Humidity on/off
Abs.Pressure on/off
Device Settings Language English/German/Italia
n/French/Spanish
Backlight Auto Off On/Off
Auto Off On/Of
Bluetooth On/Off
Date&Time Date Format
Time Format
Set Date&Time
Gliding average 5 – 20 sec
Hood adjustment Supply Air
Exhaust Air
Zeroing int 1-20 sec
Reset Device -- --
3
Maximum of 25 points and 1 minute per point.
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Display
Explanation
6 Using the product
6.1. Switching Bluetooth® on and off
In order to be able to establish a connection via Bluetooth,
you need a tablet or smartphone with the Testo App testo
420 already installed on it.
You can get the App for iOS instruments in the App Store
or for Android instruments in the Play Store.
Information about compatibility can be found in the relevant
App Store.
Measurements can be performed and saved with App into
the instruments memory. Measuring mode and save
function on the instrument itself is not available during
Bluetooth communication is established with a mobile
device.
Switching on Bluetooth
1. Hold ▲ down for 3 seconds.
- Once the Bluetooth icon is shown on the display, Bluetooth is
switched on.
- If no connection is established, Bluetooth switches off after 10
mins.
or
1. Press -> Device Settings -> Bluetooth, ► and using ▲/▼
-> select Off. Confirm with .
- Once the Bluetooth icon is shown on the display,
Bluetooth is switched on.
- If no connection is established, Bluetooth switches off after 10
mins.
6 Using the product
15
flashes
is permanently
displayed
is not displayed
There is no Bluetooth connection, or a
potential connection is being searched for.
There is a Bluetooth connection.
Bluetooth is disabled.
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6 Using the product
6.2. Settings for the measurement
6.2.1. Damping (Gliding Average)
If the readings fluctuate widely, it is advisable to damp the
readings. The time range for the damping can be set manually
between 5-20 seconds.
1. Press , then select Device settings and Gliding average.
- The damping can be set between 5-20 seconds.
6.2.2. Hood Calibration
This input is provided for the filing of calibration data by the relevant
calibration laboratory. The flow hood-specific adjustment data can
be input manually for supply air and exhaust air and has a direct
effect on the measurement results. Input option of 0.001-9.999.
1. Press , then select Device settings and Hood adjustment.
- Calibration of the hood can be set for supply air and exhaust air.
6.2.3. Zeroing Interval (Automatic Zeroing)
The pressure sensor carries out automatic zeroing at regular
intervals. These intervals can be set via the automatic zeroing.
1. Press , then select Device settings and Zeroing int.
- The zeroing interval can be set between 1-20 seconds.
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6.3. Volume flow measurement setup
Standard hood (610x610 mm, scope of delivery; 360x360 mm, accessories)
6 Using the product
1. Pull the lower end of the hood over the measurement base.
2. Attach the hood at two corners using the snap fasteners.
3. Tighten the closure.
4. Push the support rods through the hood, along the markings
and into the funnel in the measurement base.
5. Push the support rods on the top of the hood into the brackets.
- The hood is installed.
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6 Using the product
Large hood (1220x610 mm, 1220x305 mm and 915x915 mm, accessories)
1. Install the aluminium frame and stretch the fabric hood over the
framework, so that the elastic band lies in the recess of the
frame. Make sure that the elastic band fits correctly, especially
at the corners.
2. Pull the lower end of the hood over the measurement base.
3. Attach the hood at two corners using the snap fasteners.
4. Tighten the closure.
5. Push the support rods through the hood, along the markings
and into the funnel in the measurement base.
6. Push the support rods on the top of the hood into the brackets.
- The hood is installed.
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At
taching the measuring instrument
6 Using the product
1. Push the testo 420 completely into the instrument holder, pay
attention to the catch on the right-hand and left-hand side in the
bracket.
6.4. Measuring
6.4.1. Volume flow measurement
✓ The volume flow hood is fitted.
1. Switch on the instrument.
2. In the instrument settings, set the application volume flow hood
and also the required measurement program:
Single measurement or Continuous measurement.
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6 Using the product
3. Press ►, ■ on the testo 420, or the trigger on the measurement
base to hold or start and stop the measurement.
4. Press to save the measurement data. Unsaved
measurement data is lost once you carry out the next
measurement.
- The target folder and file name are displayed, confirm with
to save the measurement data under this name and in the
selected folder.
6.4.2. Pitot tube measurement
1. Remove the testo 420 from the measurement base.
2. Connect the hoses to the testo 420 and to the Pitot tube.
3. Press -> Application -> Pitot tube and there set the duct
geometry, the Pitot tube factor and the temperature, and
choose between actual and standard.
4. Select the required measurement program.
With a timed/multi-point measurement program, the
required number of measuring points can be recorded
using [►, ■]. To end the measurement, press and hold
down [►, ■] for at least 3 s. At least one measuring point
must be recorded before the measurement can be
terminated.
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5. Carry out the measurement.
6. Press to save the measurement data. Unsaved
measurement data is lost once you carry out the next
measurement.
- The target folder and file name are displayed, confirm with
to save the measurement data under this name and in the
selected folder.
The Pitot tube factor for Pitot tubes is generally the same
and must be entered:
Pitot tubes from Testo, Pitot tube factor: 1.00
Straight Pitot tubes from Testo, Pitot tube factor: 0.67
Air flow velocity matrix 0699.7077, Pitot tube factor: 0.82
For Pitot tubes from other manufacturers, refer to the
instruction manual for the Pitot tube factor or ask your
supplier.
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6.4.3. Differential pressure measurement
1. Remove the testo 420 from the measurement base.
2. Connect the hoses to the testo 420 at + and -.
3. Press -> Application -> Pressure only.
4. Carry out the measurement.
5. Press to save the measurement data. Unsaved
measurement data is lost once you carry out the next
measurement.
- The target folder and file name are displayed, confirm with
to save the measurement data under this name and in the
selected folder.
6.5. Saving
A maximum of 99 measurements can be saved in one
folder.
> -> Memory ->
- The folder overview is shown on the display. Create a new
folder via New Folder.
A maximum 100 folders can be created.
6 Using the product
Open folder
> Using the arrow keys, navigate to the required folder and press
.
- The selected folder is opened and the individual files are
displayed.
Delete folder
1. Using the arrow keys, navigate to the required folder and press
.
2. Select the menu item Delete Folder and confirm with .
- The folder that you want to delete is shown on the display.
3. Confirm once again with in order to delete the folder,
or cancel by pressing Esc.
Set as Logging Folder
This setting establishes which folder is to be specified as the
standard storage location for saving the measurements.
The folder which is set as the standard storage location is
marked in black.
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6 Using the product
1. Using the arrow keys, navigate to the required folder and press
2. Select the menu item Set as Logging Folder and confirm with
- The selected folder is set as the standard storage location.
- The stored location can be changed during the saving process.
.
.
Total Volume Flow
If data from single measurements is saved within a folder,
the total volume flow of all measurements can be displayed
using this function.
1. Using the arrow keys, navigate to the required folder and press
.
2. Select the menu item Total Volume Flow and confirm with .
- The single measurements and the total volume flow are
displayed.
3. Press .
- The result of the total volume flow is saved.
6.6. Transferring measurement data to the PC
No Bluetooth connection is possible while there is a
connection to the PC. The existing Bluetooth connection is
aborted.
The PC identifies the testo 420 as a removable medium. In
the event of any formatting, please make sure that the FAT
format is always selected under the file system.
1. Connect the testo 420 to your PC using the USB cable.
- The testo 420 switches on automatically, a window appears on
the PC, select Open folder here. The folders and files saved on
your testo 420 are displayed. The files are available in the file
format *.txt.
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7 Maintaining the product
Can not
available in Bluetooth
instrument is connected to a Tablet
7.1. Cleaning the instrument
Do not use any aggressive cleaning agents or solvents!
Mild household cleaning agents or soap suds may be used.
> If the housing of the instrument is dirty, clean it with a damp
cloth.
8 Tips and assistance
8.1. Questions and answers
Question Possible causes/solution
For selected parameters,
no values are shown on
the instrument display
(-----)
Warning message
turn on! when selecting
certain parameters in the
Display menu.
• [►, ■] on the
instrument does not
work.
• Warning message
Function not
mode.
No temperature/humidity probe is
connected, for instance.
• This parameter is not available for
the application currently selected.
• Four parameters are already
displayed. Disable the display of
one parameter to enable another
one.
• Bluetooth connection is active, the
or Smartphone via Bluetooth and
the App is active.
• Fully close the App or end the
Bluetooth connection.
8 Tips and assistance
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8 Tips and assistance
Accessories and spare parts
Description Article no.
testo 420 differential pressure measuring
instrument (stand-alone device)
Flow hood 360x360 mm with bag 0554 4200
Flow hood 305x1220 mm with bag 0554 4201
Flow hood 610x1220 mm with bag 0554 4202
Flow hood 915x915 mm with bag 0554 4203
Fabric cover for the hood 610x610 0400 4200
Aluminium frame for the hood 610x610 0440 4204
Tripod, extendable to 4 m 0554 4209
Connection hose, silicone, length 5 m,
maximum load capacity 700 hPa (mbar)
Connection hose, silicone-free, for differential
pressure measurement, length 5 m,
maximum load capacity 700 hPa (mbar)
Pitot tube, length 500 mm, Ø 7 mm, stainless
steel, for measuring flow velocity
(Connection hose required)
Pitot tube, length 350 mm, Ø 7 mm,
stainless steel, for measuring flow velocity
(Connection hose required)
Pitot tube, 1,000 mm long, stainless steel,
measures flow velocity
(Connection hose required)
Connection hose 0554 0453
Tension rod 0440 4201
Air flow velocity matrix, telescope with
spherical head, length 1.8 m, with 2 x 2 m
connection hose, silicone-free, with Velcro
fastening on the telescope
Air flow velocity matrix, telescope with
spherical head, length 1.8 m, with 2 x 2 m
connection hose, silicone-free, with Velcro
fastening on the telescope and testo 420
measuring instrument
0560 0420
0554 0440
0554 0453
0635 2045
0635 2145
0635 2345
0635 8888
Testo ID no.
0699.7077/1
0635 8888
Testo ID no.
0699.7077/2
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8 Tips and assistance
For a c
omplete list of all accessories and spare parts, please refer
to the product catalogues and brochures or visit our website
www.testo.com
If you have any questions, please contact your dealer or Testo
Customer Service. The contact details can be found on the back of
this document or on the Internet
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9 Authorizations
9 Authorizations
Please note the following country-specific information for the
product authorization.
European Union, EFTA countries
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9 Authorizations
Can
ada
Product IC ID: 12231A-05600420
This instrument complies with Part 15C of the FCC Rules and
Industry Canada RSS-210 (revision 8). Commissioning is subject to
the following two conditions:
(1) This instrument must not cause any harmful interference and
(2) this instrument must be able to cope with interference, even if
this has undesirable effects on operation.
Cet appareil satisfait à la partie 15C des directives FCC et au
standard Industrie Canada RSS-210 (révision 8). Sa mise en
service est soumise aux deux conditions suivantes :
(1) cet appareil ne doit causer aucune interférence dangereuse et
(2) cet appareil doit supporter toute interférence, y compris des
interférences qui provoquerait des opérations indésirables.
USA
Product FCC ID: 2ACVD05600420
Information from the FCC (Federal Communications Commission)
This instrument complies with part 15 of the FCC Rules. Its
commissioning is subject to the following two conditions:
(1) This instrument may not cause harmful interference and
(2) this instrument must be able to accept interference, even if this
could have undesired effects on the operation.
Changes
The FCC demands that the user be informed that any changes or
modifications to the instrument that have not been explicitly
approved by Testo AG may void the user's right to use this
instrument.
Australia
E 1561
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9 Authorizations
Brasilian
China
CMIIT ID: 2015DP4400
Hongkong
Authorized.
Japan
28
Korea
Certification No. MSIP-CMM-Toi-420
해당 무선 설비는 운용 중 전파혼신 가능성이 있음
Turkey
Authorized.
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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