Testo Testo 926 Manual

Content

General notes ....................................................22

1. Safety advice......................................................23

2. Intended purpose ..............................................24

3. Product description............................................25

3.1 Display and control elements ........................................25

3.2 Interfaces ......................................................................26

3.3 Voltage supply ..............................................................26

4. Commissioning ..................................................27

5. Operation ..........................................................28

5.1 Connect the probe........................................................28

5.2 Switching the instrument on / off ..................................28

5.3 Switching the display light on / off ................................29

5.4 Performing settings ......................................................29

6. Measuring ..........................................................34

7. Care and maintenance ......................................36

8. Questions and answers......................................37

9. Technical data ....................................................38

10. Accessories / Spare parts ..................................39

testo 926

Temperature measuring instrument

Instruction manual

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

22

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

General notes

23

1. Safety advice

This chapter gives the 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 instrument and probes to measure on or

near live parts.

i Never store the instrument/probes together with

solvents and do not use any dessicants.

Product safety/preserving warranty claims

i Operate the instrument only within the parameters

specified in the Technical data.

i Always use the 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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1. Safety advice

24

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 926 is a compact measuring instrument for
measuring temperatures.

The product was designed for the following
tasks/applications:

· Food industry

· Laboratories

The product should

not

be used in the following areas:

· Areas at risk of explosion

· Diagnostic measurements for medical purposes

2. Intended purpose

25

3. Product description

This chapter provides an overview of the components of
the product and their functions.

3.1 Display and control
elements

Overview

 Infrared interface, probe socket(s)
 Display
 Control buttons
 Radio module compartment, battery

compartment (rear)

Key functions

Key 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:
Select option, increase value (press and
hold to increase values rapidly)

Print data
Change between displaying connected

probe and radio probe ( lit)
In configuration mode: Select option,

decrease value (press and hold to
decrease values rapidly)

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3. Product description

26

Important displays

Display Meaning

Battery capacity (bottom left 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
Print function: Readings are sent to the printer
Upper alarm limit: Lit if exceeded
Lower alarm limit: Lit if undershot
Measurement channel: Radio probe (the number of “radio wave”

segments shown indicates the strength of the signal)

3.2 Interfaces

Infrared interface

Measurement data can be sent to a Testo printer via the
infrared interface on the head of the instrument.

Sensor socket(s)

Plug-in measuring probes can be connected via the probe
socket(s) on the head of the instrument.

Radio module (accessory part)

Radio probes may only be used in countries in which
they have been Type Approved (see application infor­mation of the radio probe).

A radio measuring probe can be connected via the radio
module.

3.3 Voltage supply

Voltage is supplied by means of a 9 V 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.

3. Product description

27

4. Commissioning

This chapter describes the steps required to commission
the product.

²

Removing tthe pprotective ffilm oon tthe ddisplay:

i Pull the protective film off carefully.

²

Inserting aa bbattery/rechargeable bbattery:

1 To 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.

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

Observe the polarity!

3 To close the battery compartment, replace the lid of

the battery compartment and push it against the
direction of the arrow.

- The instrument switches itself on and configuration
mode is opened.

4 Set the date, time and unit of measurement.

º See the chapter PERFORMING SETTINGS, objectives
SETTING THE DATE/TIME and following.

²

Inserting aa rradio mmodule ((accessory ppart):

Radio probes may only be used in countries in which
they have been Type Approved (see application infor­mation of the radio probe).

 The instrument is switched off.

1 To open the radio module compartment on the rear of

the instrument, push the clip lock downwards and
remove the lid of the radio module compartment.

2 Insert the radio module.
3 To close the radio module compartment, replace the

radio module compartment and close it.

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4. Commissioning

28

5. Operation

This chapter describes the steps that have to be executed
frequently when using the product.

5.1 Connect the probe

Plug-in probes

Plug-in probes must be connected before the measuring
instrument is switched on so that they are recognised by
the instrument.

i Insert the connector of the probe into the probe

socket.

Radio probes

Radio probes may only be used in countries in which
they have been Type Approved (see application infor­mation of the radio probe).

A radio module (accessory part) is required for the use of
radio probes. The radio module must be connected before
the measuring instrument is switched on so that it is
recognised by the instrument.

Each radio probe has a probe ID (identification number).
This must be set in configuration mode.

º See the chapter PERFORMING SETTINGS.

5.2 Switching the instrument
on / off

²

Switching tthe iinstrument oon:

i Press .

- Measurement view is opened: The current reading
is displayed, or ---- lights up if no reading is
available.

5. Operation

29

²

Switching tthe iinstrument ooff:

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

goes out

5.3 Switching the display
light on / off

²

Switching tthe ddisplay llight oon / off:

 The instrument is switched on.
i Press .

5.4 Performing settings

1

To oopen cconfiguration mmode:

 The instrument is switched on and is in measurement

view. Hold, Max or Min are not activated.

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

changes.
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.

2

To sset tthe aalarm ffunction:

 Configuration mode is opened, Alarm is displayed.

1 Select the desired option with and confirm with

:

· OFF: Switches the alarm function off.

· On: Switches the alarm function on.

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5. Operation

30

OFF was selected:

º Continue with objective TO REGISTER THE RADIO PROBE.

On was selected:

2 Use / to set the value for the upper alarm

threshold ( ) and confirm with .

3 Use / to set the value for the lower alarm

threshold ( ) and confirm with .

3

To rregister tthe rradio pprobe:

Radio probes may only be used in countries in which
they have been Type Approved (see application infor­mation of the radio probe).

The setting function for radio probes is only available if
a radio module (accessory part) is inserted into the
measuring instrument.

º See the chapter COMMISSIONING.

If no radio module is inserted:

º Continue with objective TO SET AUTO OFF.

Each radio probe has a probe ID (RF ID). This consists of
the last 3 digits of the serial no. and the position of the
slide switch in the radio probe (H or L).

 Configuration mode is opened and RF ID and Auto are

lit.

 The radio probe is switched on and the transfer rate is

set to 2 readings per second (see application infor­mation of the radio probe).

1 Select the desired option with and confirm with

:

· YES: Switches automatic probe detection on
(recommended).

· no: Switches automatic probe detection off.

no was selected:

2 Use / to set the probe ID manually and

confirm with .

5. Operation

31

YES was selected:

- Automatic probe detection is started. Auto flashes
while the instrument looks for a radio probe that is
switched on.

- Once a radio probe is found, the probe ID is
displayed. If no probe is found, NONE lights up.

Possible reasons why probes are not found:

· The radio probe is not switched on or the
battery of the radio probe is spent.

· The radio probe is outside the range of the
measuring instrument.

· Sources of interference are influencing the radio
transmission (e.g. reinforced concrete, metal
objects, walls or other barriers between
transmitter and receiver, other transmitters of the
same frequency, strong electromagnetic fields).

i If necessary, rectify the possible causes for the

disruption to the radio transmission and start
automatic probe detection again with .

2 Press to change to the next function.

4

To sset AAuto OOff:

 Configuration mode is opened, Auto Off is lit.
i Select the desired option with and confirm with

:

· On: The measuring instrument switches off
automatically if no button is pressed for 10 min.
Exception: A recorded reading is shown on the
display (Hold or Auto Hold is lit).

· OFF: The measuring instrument does not switch
itself off automatically.

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5. Operation

32

5

To sset AAuto HHold:

The Auto Hold function is only active on plug-in
measuring probes.

 Configuration mode is opened, Auto Hold is lit.

1 Select the desired option (5, 10, 15, 20s) with and

confirm with :

· OFF: Readings are not recorded automatically.

· On: Once a stable reading is obtained (change in
reading <0.2 °C/0.4 °F in the set evaluation time), it
is recorded automatically.

OFF was selected:

º Continue with objective TO SET THE MAX./MIN. PRINT

FUNCTION

.

On was selected:

2 Use / to set the value for the evaluation time

(in s) and confirm with .

6

To sset tthe mmax./min.print ffunction:

 Configuration mode is opened, MaxMin and are lit.
i Select the desired option with and confirm with

.

· On: Maximum and minimum values are printed out
as well when current or recorded readings are
printed.

· OFF: Maximum and minimum values are not printed
out as well when current or recorded readings are
printed.

7

To sset tthe ddate/time:

 Configuration mode is opened, Year is lit.

1 Use / to set the current year and confirm

with .

2 Use / to set the other values for the month

(Month), day (Day) and time (Time) and confirm each
one with .

5. Operation

33

8

To sset tthe uunit oof mmeasurement:

 Configuration mode is opened, °C or °F flashes.
i Select the desired unit of measurement with and

confirm with .

9

To rreset:

 Configuration mode is opened, RESET is lit.
i 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 setting of the probe ID for
the radio probe is not reset.

- The instrument returns to measurement view.

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5. Operation

Test Equipment Depot - 800.517.8431
99 Washington Street, Melrose, MA 0
TestEquipmentDepot.com

2176

34

6. Measuring

This chapter describes the steps that are required to
perform measurements with the product.

 The instrument is switched on and is in measurement

view.

²

Taking aa mmeasurement:

i Put the probe in position and read off the readings.

With the Auto Hold function on:

The Auto Hold function is only active on plug-in
measuring probes.

- Auto Hold flashes during measurement.

- If the reading is stable within the set evaluation
time, a signal tone is given and the reading is
recorded.

i Start measurement again with .

With the alarm function on and if the alarm threshold
is exceeded or not undershot:

- Alarm lights up and a signal tone is given.

- The alarm goes out if the reading goes below the
upper or above the lower threshold again.

²

Changing tthe mmeasurement cchannel ddisplay:
You can change between displaying plugged-in probes

and radio probes ( ).

i To change the display: Press .

²

Holding tthe rreading, ddisplaying tthe mmaximum/minimum
value:

The current reading can be recorded. The maximum and
minimum values (since the instrument was last switched
on) can be displayed.

6. Measuring

35

i Press several times until the desired value is

displayed.

- The following are displayed in turn:

· Hold: the recorded reading

· Max: Maximum value

· Min: Minimum value

· The current reading

- In addition to the recorded, maximum or minimum
readings, the 2nd reading line shows the current
reading

²

Resetting tthe mmaximum/minimum vvalues:
The maximum/minimum values of all channels can be

reset to the current reading.

This function is not available if the Auto Hold function
is switched on.

1 Press several times until Max or Min lights up.
2 Press and hold .

- The displayed value flashes twice. All maximum and
minimum values are reset to the current reading

²

Printing rreadings:
The readings shown on the display (current reading,

recorded reading or max./min. reading) can be printed
out.
A Testo printer is required (accessory part).

With the Max./Min. print function switched on, the
maximum and minimum values are printed out as well
as the current reading or recorded reading.

º See the chapter PERFORMING SETTINGS.

1 Configure the instrument so that the value to be

printed is shown on the display.

2 Press .

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6. Measuring

36

7. Care and maintenance

This chapter describes the steps that help to maintain the
functionality of the product and extend its service life.

±

Cleaning tthe hhousing:

i Clean the housing with a moist cloth (soap suds) if it

is dirty. Do not use aggressive cleaning agents or
solvents!

±

Changing tthe bbattery/rechargeable bbattery:

 The instrument is switched off.

1 To open the battery compartment on the rear of the

instrument, push the lid of the compartment in the
direction of the arrow and remove it.

2 Remove the spent battery/rechargeable battery and

insert a new battery/rechargeable battery (9 V mono­bloc). Observe the polarity!

3 To close the battery compartment, replace the lid of

the compartment in position and push it against the
direction of the arrow.

If the voltage supply had been interrupted for a long
period, the date/time and unit of measurement will have
to be reset:

- The instrument switches itself on and configuration
mode is opened.

i Set the date/time and unit of measurement.

º See the chapter PERFORMING SETTINGS, objectives

SETTING THE DATE/TIME and following.

7. Care and maintenance

37

8. Questions and
answers

This chapter gives answers to frequently asked questions.

Question Possible causes Possible solution

is lit (bottom left · Instrument battery is · Replace instrument

in display). almost spent. battery.

is lit (above · Radio probe battery · Replace radio probe

symbol). is almost spent. battery.

Instrument switches ·

Auto Off function Switch function off.

itself off. is switched on.

· Residual capacity · Replace battery
of battery is too low.

Display:

----- · Sensor is not plugged in. · Switch instrument off,

connect probe and
switch instrument
back on again.

· Sensor break. · Please contact your

dealer or Testo
Customer Service.

Display:

uuuu · Permitted measuring range · Keep to permitted

was undershot. measuring range.

Display:

oooo· · Permitted measuring range · Keep to permitted

was exceeded. measuring range.

Display:

no Signal · Registered probe · Register radio probe

was not found. again, see chapter

Performing settings,
objective To register

the radio probe.

Date/time are · Voltage supply was · Reset date and time.
no longer correct interrupted for a longer time

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8. Questions and answers

If we are unable to answer your question, please contact
your dealer or Testo Customer Service.

38

9. Technical data

Characteristic Value

Parameters Temperature (°C/°F)
Measuring range -50.0...+400°C / -58.0...+752.0 °F
Resolution 0.1°C / 0.1°F (-50.0...+199.9 °C / -58.0...+391.8°F)

1°C / 1°F (rest of range)

Accuracy ±0.3°C / ±0.6°F (-20.0...+70.0 °C / -4.0...+158.0°F)

±0.7°C+5% o. r. / ±1.3°F+5% o. r. (rest of range)

Probe connections 1x Omega TC socket for temperature probe

type T (Cu-CuNi), radio module (accessory part)
Measuring rate 2/s
Operating temperature range -20 ... +50 °C / -4 ... +122°F
Storage temperature -40 ... +70°C / -40 ... +158 °F
Voltage supply 1x 9 V monobloc battery/rech. battery
Running time (display with probe connected: approx. 200 h / approx. 68h,

lighting off / on) with radio probe: approx. 45h / 33h
Protection class with TopSafe (accessory part) and probe connected: IP65
EC Directive 89/336/EEC
Warranty 2 years

9. Technical data

39

10. Accessories /
Spare parts

Name Part no.

Radio modules

1

Radio module 869.85MHz, authorisation for e. g. DE, ES, IT, FR, GB 0554 0188
Radio module 915.00MHz, authorisation for e. g. USA 0554 0190

Radio probes

1

Radio immersion/penetration probe, NTC,
authorisation for e. g. DE, ES, IT, FR, GB 0613 1001

Radio immersion/penetration probe, NTC, authorisation for e. g. USA 0613 1002

Universal radio handles

Radio handle for plug-in probeheads incl. TC adapter,
authorisation for e. g. DE, ES, IT, FR, GB 0554 0189

Radio handle for plug-in probeheads incl. TC adapter,
authorisation for e. g. USA 0554 0191

Adapter for connection to TC probes on radio handle 0554 0222
TC -probehead for air/immersion tip, attachable to radio handle 0602 0293

TC probes, type T

Water-proof immersion/penetration probe, TC type T 0603 1293
Water-proof surface probe with widened measurement tip for

smooth surfaces, TC type T 0603 1993
Robust affordable air probe, TC type T 0603 1793

Miscellaneous

TopSafe testo 925/926, protects from impact and dirt particles 0516 0220

Testo printer with IRDA and infrared interface,

1 roll thermal paper and 4 round cell batteries 0554 0547

1

Radio probes may only be used in countries in which they have been Type
Approved (see application information of the radio probe).

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10. Accessories/Spare parts

Notes40

0977.9260/01/T/dr/15.06.2005

Test Equipment Depot - 800.517.8431
99 Washington Street

, Melrose, MA 02176

TestEquipmentDepot.com