TESTO 425 Manuale utente

Bedienungsanleitung de

Instruction manual en

Mode d’emploi fr

Contents

General notes ....................................................18

1. Safety advice .....................................................18

2. Intended purpose...............................................19

3. Product description............................................20

3.1 Display and control elements........................................ 21

3.2 Voltage supply.............................................................. 22

4. Commissioning ..................................................22

5. Operation...........................................................23

5.1 Connecting a probe...................................................... 24

5.2 Switching the instrument on / off .................................. 24

5.3 Switching the display light on / off ................................ 24

5.4 Performing settings ...................................................... 24

6. Measuring..........................................................26

7. Care and maintenance.......................................30

8. Questions and answers......................................31

9. Technical data ...................................................32

10. Accessories/spare parts.....................................32

testo 425

Thermal anemometer

General notes18

General notes

This chapter provides important advice on using this

documentation.

The documentation contains information that must be

applied if the product is to be used safely and efficiently.

Please read this documentation through carefully and

familiarise yourself with the operation of the product before

putting it to use. Keep this document to hand so that you

can refer to it when necessary.

Identification

Representation Meaning Comments

Note Offers helpful tips and information.

, 1, 2 Objective Denotes the objective that is to be

achieved via the steps described. Where

steps are numbered, you must always

follow the order given!

Condition A condition that must be met if an action

is to be carried out as described.

>, 1, 2, ... Step Carry out steps. Where steps are

numbered, you must always follow the

order given!

Text Display text Text appears on the instrument display.

Button Control button Press the button.

- Result Denotes the result of a previous step.

Cross-reference Refers to more extensive or detailed

information.

1. Safety advice 19

1. Safety advice

This chapter gives general rules which must be followed

and observed if the product is to be handled safely.

Avoid personal injury/damage to equipment

>Do not use the measuring instrument and probes to

measure on or near live parts.

>Never store the measuring instrument/probes together

with solvents and do not use any desiccants.

Product safety/preserving warranty claims

>Operate the measuring instrument only within the

parameters specified in the Technical data.

>Always use the measuring instrument properly and for its

intended purpose. Do not use force.

>Do not expose handles and feed lines to temperatures in

excess of 70 °C unless they are expressly permitted for

higher temperatures.

Temperatures given on probes / sensors relate only to

the measuring range of the sensors.

>Open the instrument only when this is expressly

described in the documentation for maintenance and

repair purposes.

Carry out only the maintenance and repair work that is

described in the documentation. Follow the prescribed

steps when doing so. For safety reasons, use only

original spare parts from Testo.

Ensure correct disposal

>Take faulty rechargeable batteries/spent batteries to the

collection points provided for them.

>Send the product back to Testo at the end of its

useful life. We will ensure that it is disposed of in an

environmentally friendly manner.

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2. Intended purpose20

2. Intended purpose

This chapter gives the areas of application for which the

product is intended.

Use the product only for those applications for which it was

designed. Ask Testo if you are in any doubt.

testo 425 is a compact instrument for measuring flow

velocities and temperatures by means of a permanently

connected flow/temperature probe (hot wire probe).

The product was designed for the following tasks/

applications:

· Measuring volumetric flow rates in ducts

· Measuring flow velocities in rooms

· Measuring the temperature of flows

The product should not be used in the following areas:

· Areas at risk of explosion.

· Diagnostic measurements for medical purposes

3. Production description 21

3. Product description

This chapter provides an overview of the components of

the product and their functions.

3.1 Display and control

elements

Overview

Probe

Display

Control buttons

Battery compartment (rear)

Service compartment (rear)

Button functions

Button Functions

Switch instrument on;

switch instrument off (press and hold)

Switch display light on / off

Keep reading, display maximum/

minimum value

Open/leave configuration mode (press

and hold);

In configuration mode:

Confirm input

In configuration mode:

Increase value, select option

In configuration mode:

Reduce value, select option

Multi-point and timed mean calculation

Volumetric flow

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3. Production description22

Important displays

Display Meaning

Battery capacity (bottom right in display):

·4 segments in the battery symbol are lit: Instrument battery is fully

charged

·No segments in the battery symbol are lit: Battery is almost spent

3.2 Voltage supply

Voltage is supplied by means of a 9V monobloc battery

(included in delivery) or rechargeable battery. It is not

possible to run the instrument from the mains supply or

charge a rechargeable battery in the instrument.

4. Commissioning 23

4. Commissioning

This chapter describes the steps required to commission

the product.

Inserting a battery/rechargeable battery:

1To open the battery compartment on the rear of the

instrument, push the lid of the battery compartment in

the direction of the arrow and remove it.

2Insert a battery/rechargeable battery (9V monobloc).

Observe the polarity!

3To close the battery compartment, replace the lid

of the battery compartment in position and push it

against the direction of the arrow.

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5. Operation24

5. Operation

This chapter describes the steps that have to be executed

frequently when using the product.

5.1 Connecting a probe

The necessary probes are permanently connected or

integrated. It is not possible to connect any additional

probes.

5.2 Switching the instrument

on / off

Switching the instrument on:

>Press .

- The thermal sensor is heated up (5s).

- Measurement view is opened: The current reading

is displayed, or ----- lights up if no reading is

available.

Switching the instrument off:

>Press and hold (for approx. 2s) until the display

goes out.

5.3 Switching the display

light on / off

Switching the display light on/off:

The instrument is switched on.

>Press .

5. Operation 25

5.4 Performing settings

1To open configuration mode:

The instrument is switched on and is in measurement

view. Hold, Max or Min are not activated.

>Press and hold (for approx. 2s) until the display

changes.

- The instrument is now in configuration mode.

You can change to the next function with .

You can leave configuration mode at any time. To do

so, press and hold (for approx. 2s) until the

instrument has changed to measurement view. Any

changes that have already been made in configuration

mode will be saved.

2To set the area:

Configuration mode is opened, AREA is lit.

>Set the cross-sectional area with / and

confirm with .

3To set the absolute pressure:

The absolute pressure is required for the pressure

compensation of the flow velocity measurement value.

The absolute pressure must be measured using a

separate instrument or obtained from the local

weather station.

Configuration mode is opened, HPA or InHG is lit.

>Set the absolute pressure with / and confirm

with .

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5. Operation26

4To set Auto Off:

Configuration mode is opened, AutoOff is flashing.

>Select the desired option with / and confirm

with :

· on: The measuring instrument switches off

automatically if no button is pressed for 10min (Hold

or Auto Hold is lit).

· oFF: The measuring instrument does not switch

itself off automatically.

5To set the unit of measurement:

Configuration mode is opened, UNIT is lit.

1With / set the required unit for the top line

(m/s, fpm) and confirm with .

2With / set the required unit for the bottom

line (m3/h, l/s, cfm) and confirm with .

6To reset:

Configuration mode is opened, RESET is lit.

>Select the desired option with / and confirm

with :

· no: Instrument is not reset.

· Yes: Instrument is reset. The instrument is reset to

the factory settings.

- The instrument returns to measurement view.

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