TESTO 420 Manual de usuario

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testo 420 ·Differential Pressure Instrument

Instruction manual

1.800.561.8187info@Testo-Direct.ca www.Testo-Direct.ca

1 Contents

3

1Contents

1Contents ...................................................................................................3

2Safety and the environment....................................................................4

2.1. About this document........................................................................4

2.2. Ensure safety...................................................................................5

2.3. Protecting the environment..............................................................6

3Specifications ..........................................................................................6

4Technical data..........................................................................................6

5Product description.................................................................................9

5.1. Overview..........................................................................................9

6First steps ..............................................................................................11

7Using the product ..................................................................................13

7.1. Switching Bluetooth® on and off....................................................13

7.2. Settings for the measurement........................................................14

7.2.1. Damping (Gliding Average)............................................................................ 14

7.2.2. Hood Calibration ............................................................................................14

7.2.3. Zeroing Interval (Automatic Zeroing)..............................................................14

7.3. Measuring......................................................................................14

7.3.1. Pitot tube measurement.................................................................................14

7.3.2. Differential pressure measurement ................................................................15

7.4. Saving ...........................................................................................15

7.5. Transferring measurement data to the PC ....................................16

8Maintaining the product ........................................................................17

8.1. Cleaning the instrument.................................................................17

9Tips and assistance...............................................................................17

9.1. Questions and answers .................................................................17

9.2. Accessories and spare parts .........................................................18

10 Authorizations........................................................................................19

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2 Safety and the environment

4

2Safety 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

Representation Explanation

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 Safety and the environment

5

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.

Testo guarantees the functionality of its products when used in

accordance with their intended purpose. This guarantee does not apply

to features of Testo products in combination with unauthorised third-

party products. Competitor products are not authorised by Testo.

As is common practice, Testo generally excludes support, warranty or

guarantee claims relating to functionality that has not been guaranteed

by Testo as part of the product offered. Claims shall also be excluded

in the event of improper use or handling of the products, e.g. in

combination with unauthorised third-party products.

For products with Bluetooth®

Changes or modifications that have been made without the explicit

consent of the responsible approval authority, may cause the

retraction of the type approval.

Data transfer may be disturbed by equipment that uses the same

ISM-band, e.g. WLAN, microwave ovens, ZigBee.

The use of radio communication links is not permitted in aeroplanes

and hospitals, among others. For this reason the following points

must be ensured before entering:

> Switch off the instrument.

> Disconnect control unit from all external power sources (mains

cable, external rech. batts., ...).

1.800.561.8187info@Testo-Direct.ca www.Testo-Direct.ca

4 Technical data

6

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)

3Specifications

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.

4Technical 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 re-

sale, export, import etc. in particular in countries without wireless

permits, is his responsibility.

Feature Values

Measurement

parameters

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 / mmH2O / inH2O

Measuring cycle 1/sec

Interfaces Probe interface Mini DIN (testo 420 Set)

Micro USB

1.800.561.8187info@Testo-Direct.ca www.Testo-Direct.ca

4 Technical data

7

Feature Values

Measuring ranges Flow velocity: 0 to 14 m/s /

0 to 2750 ft/min

Pressure (absolute pressure):

700 to 1100 hPa

Pressure (differential pressure): -

120 to +120 Pa

Resolution 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

Accuracy

(nominal temperatur

e 22°C/71.6°F)

Flow velocity and Volume flow: no accuracy

specification since calculated variable

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

Temperature

coefficient

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)

Response time t90 Flow velocity: approx. 1 s

Volume flow: approx. 1 s

Pressure (absolute pressure): approx. 1 s

Pressure (differential pressure): approx. 1 s

1.800.561.8187info@Testo-Direct.ca www.Testo-Direct.ca

4 Technical data

8

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

Measuring instrument dimensions:

150x85x35 mm

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,

standards and tests

EU guideline: 2014/30/EU

1.800.561.8187info@Testo-Direct.ca www.Testo-Direct.ca

5 Product description

9

5Product description

5.1. Overview

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

/ / Measuring mode:

Pressure measurement, Pitot tube, volume

flow (air pressure from above into the hood /

suction outlet)

1.800.561.8187info@Testo-Direct.ca www.Testo-Direct.ca

5 Product description

10

Icon Meaning

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.

Standard 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.

K-factor Factor by which the current reading is

multiplied. Depends on which outlet

measurements are being taken at.

Pitot Tube factor

(P-factor)

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.

Control keys

Key Function

Menu

[►, ■]Holds / starts / stops a measurement

[ESC] Switches to the previous view / to the

measurement view

Saves the measured values

[►, ▲, ▼,◄]Navigation within the menu

[] Confirms a selection

1.800.561.8187info@Testo-Direct.ca www.Testo-Direct.ca

6 First steps

11

Key Function

Switch instrument on/off (press and hold

down)

Switch illumination on/off (press briefly)

6First 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

►, ▲, ▼,◄Change parameter, select unit

Confirm input

1. Menu Level 2. Menu Level 3. Menu Level

Application Flow Hood K-factor

Actual/Standard

Pitot tube Duct

Pitot tube factor

Pitot Temperature

Actual/Standard

Pressure only --

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