Testo Testo 425 Kit Manual

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 ......................................28

8. Questions and answers......................................29

9. Technical data ....................................................30

10. Accessories/spare parts ....................................31

testo 425

Thermal anemometer

Instruction manual

Test Equipment Depot - 800.517.8431

99 Washington Street Melrose, MA 0

TestEquipmentDepot.com

2176

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.

i, 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.

Control button Press the button.

- Result Denotes the result of a previous step.

º Cross-reference Refers to more extensive or detailed

information.

Button

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

i Do not use the measuring instrument and probes to

measure on or near live parts.

i Never store the measuring instrument/probes together

with solvents and do not use any desiccants.

Product safety/preserving warranty claims

i Operate the measuring instrument only within the

parameters specified in the Technical data.

i Always use the measuring instrument properly and for its

intended purpose. Do not use force.

i 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.

i 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

i Take faulty rechargeable batteries/spent batteries to the

collection points provided for them.

i 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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