Testo Testo 420-KIT Manual

testo 420 · Flow Hood

Instruction manual

99 Washington Street
Melrose, MA 02176

Phone [phone]
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

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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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