TESTO 521, 526, 521? 526 Instruction Manual

Instruction Manual

testo 521 · testo 526

en

Foreword

Foreword

Dear Testo Customer,

We are delighted that you have chosen a product from Testo. We hope that the product
will give you a long period of satisfaction and will aid you in your work.

If problems should occur which you cannot rectify yourself, please consult our service
department or your dealer. We will endeavour to provide fast and competent assistance
to avoid lengthy down times.

Foreword 2

General notes

This documentation contains important information about the features and use of the
product. Please read this document through carefully and familiarise yourself with the
operation of the product before putting it to use. Keep this documentation to hand so
that you can refer to it when necessary.

Pictograms

This product could be dangerous if operated incorrectly. Information that requires parti­cular attention is identified in these Operating Instructions by pictograms:

Warnings are identified by means of a warning triangle. The relevant signal word! indica­tes the degree of risk:

Warning! means: Serious physical injury could occur if you do not take the
precautionary measures indicated.

Caution! means: Slight physical injury or material damage could occur if
you do not take the precautionary measures indicated.

Pay particular attention to warnings and take the precautionary measures
indicated in order to avoid danger.

Notes on special cases and peculiarities in the handling of your unit are indicated by
an exclamation mark.

Indicates with which instrument variant a menu can be executed.

Content

The content of this documentation relates to the German version of the instrument.

Standards / Tests

As declared in the certificate of conformity, this product fulfils the guidelines of
2014/30/EC.

General notes 3

526

521

Signal word

Content

Foreword .................................................................. 2

General notes ........................................................... 3

Content .................................................................... 4

1. Fundamental safety instructions ................................ 6

2. Intended purpose ..................................................... 7

3. Product description .................................................. 8

3.1 Power supply ........................................................... 8

3.2 Controls ................................................................... 8

3.3 Menu overview ....................................................... 10

4. Commissioning ....................................................... 12

4.1 Inserting the battery/rechargeable battery............... 12

4.2 Connecting the mains unit ...................................... 12

4.3 Connecting probes/sensors .................................. 13

5. Basic operating steps ............................................. 14

5.1 Switching on / off ................................................... 14

5.2 Menu navigation .....................................................15

6. Menu functions .......................................................... 16

6.1 Measurement site ................................................... 16

6.2 Memory .................................................................. 17

6.2.1 Man. / Auto. / Fast ................................................................ 17

6.2.2 Configuration ................................................................... 18

6.2.3 Printing ............................................................................ 18

6.2.3.1 Data transfer ........................................................ 19

6.2.4 Status ............................................................................ 20

6.2.5 Clearing ........................................................................... 20

6.3 Probes ................................................................... 21

6.3.1 Surface increment ............................................................. 21

6.3.2 Scaling U/I ........................................................................ 21

6.3.3 F-Reset ............................................................................. 23

6.4 Input....................................................................... 24

6.4.1 Temperature .................................................................... 25

6.4.2 Relative humidity .............................................................. 25

6.4.3 Absolute pressure ............................................................ 25

6.4.4 Density .............................................................................25

6.4.5 Cross-section ..................................................................26

6.4.6 Offset factor (O factor) ...................................................... 26

6.4.6 Pitot tube factor (P factor) ................................................. 26

Content4

6.5 Instrument .............................................................. 27

6.5.1 Time ................................................................................ 27

6.5.2 Auto. Off .......................................................................... 28

6.5.3 Unit ................................................................................... 28

6.5.4 Damping ........................................................................... 29

6.5.5 Optional ........................................................................... 30

Velocity ....................................................................... 30

Volume flow ................................................................ 30

Delta P ........................................................................31

Leakage rate ...............................................................31

Tightness test.............................................................. 31

Slowdown time ..................................................... 32

Test time ............................................................... 33

Nominal test pressure ........................................... 34

Permitted pressure loss ......................................... 34

Measuring rate ...................................................... 34

Start ......................................................................34

6.6 Service ................................................................... 37

6.6.1 Data ................................................................................. 37

6.6.2 Language .........................................................................37

6.6.3 Battery type ..................................................................... 38

6.6.4 W-Reset .......................................................................... 38

7. Measuring ............................................................... 39

7.1 Zeroing the display ................................................. 39

7.2 Selecting readings .................................................. 39

7.3 Activating measuring functions ............................... 39

Hold, Max., Min., Mean .................................................................. 39

7.4 Saving readings ...................................................... 41

7.5 Printing readings .................................................... 42

8. Care and maintenance ............................................ 43

9. Troubleshooting ...................................................... 45

10. Technical data ........................................................ 46

10.1 Measuring ranges and accuracies .......................... 46

10.2 Other instrument data ............................................ 47

11. Accessories / spare parts ........................................ 48

Contents 5

1. Fundamental safety instructions

Avoid electrical hazards:

Never make measurements with the instrument and its probes on or near live com-

ponents unless the instrument is expressly approved for current/voltage measure­ments!

Protect the instrument:

Never store the instrument together with solvents (e.g. acetone).

Product safety/preserving warranty claims:

Operate the instrument only within the parameters specified in the technical data.

Handle the instrument properly and according to its intended purpose.

Never apply force!

Temperatures given on probes/sensors relate only to the measuring range of the sen-

sors. Do not expose handles and feeders to any temperatures in excess of 70 °C
unless they are expressly permitted for higher temperatures.

Open the instrument only when this is expressly described in the Instruction Manual

for maintenance purposes.

Carry out only the maintenance and repair work that is described in the Instruction

Manual. Follow the prescribed steps exactly. For safety reasons, use only original
spare parts from Testo.

Any further or additional work must only be carried out by authorised personnel.

Testo will otherwise refuse to accept responsibility for the proper functioning of the
instrument after repair and for the validity of certifications.

Ensure correct disposal:

Dispose of defective rechargeable batteries and spent batteries at the provided col-

lection points.

Send the instrument directly to us at the end of its life cycle. We will ensure that it is

disposed of in an environmentally friendly manner.

1. Fundamental safety instructions6

2. Intended purpose

Employ the instruments for the following applications only:

The testo 521 and testo 526 instruments are handheld pressure-measuring instru­ments that were developed specifically for use in air conditioning / ventilation equipment,
thermal engineering, automotive engineering and industrial plant engineering. The main
areas of use and measuring applications are:

testo 521

Air conditioning/ventilation, clean rooms and OPs:
Pressure ranges 0 to 100 hPa/0...2,5hPa, Pitot tube measurement, volume flow calcula­tion, pressure drop on filters, fans, ...

testo 526

Industrial pressure measurement:
Pressure ranges 0 to 2000 hPa, pressure in compressed air systems, leaks in pipes &
lines, pressure drop, vacuum

Both instruments offer the following features:

- Measurement location management

- Data management via testo ComSoft software (from Version 3)

- “on-site” printout of the measured results via the testo printer

- Temperature measurement

- Wide range of probes and sensors can be connected so that one instrument covers
as many measuring tasks as possible

Location conditions

Changes in the location and temperature of the instrument and pressure probes have an
effect on the measurement results. Bring the instrument and probes into a stable positi­on before any measurement.
Do not change this position during measurement.
Do not subject the housing to mechanical strains during measurement.

Media compatibility
testo 521/526:

Permitted medium: air and non-aggressive gases

External low pressure probes 0638 1347, 0638 1447, 0638 1547, 0638 1647, 0638
1747: Permitted medium: air and non-aggressive gases

External high-pressure probes 0638 1741, 0638 1841, 0638 1941, 0638 2041, 0638
2141: Permitted medium: refrigerant, oil, water, air and non-corrosive gases

2. Intended purpose 7

3. Product description

3.1 Power supply

Power is supplied to the testo 521/526 optionally via:

- 9 V monobloc battery, type: IEC 6LR61 (included)

- 9 V monobloc rechargeable battery, type:
NiMH IEC 6F22 (0515 0025)

- Mains connection and battery charging via mains
unit 0554 0088, see also page 38 6.6.3 Battery
type)

3.2 Controls

Keyboard

 Print


Select reading 1 (top line), select menu item

 Switch on / off
 Save data


Open menu level, confirm selection, execute function

 Zero pressure probes
 Cancel process, menu level back,
 Select

reading

2 (bottom line), select menu item



Hold reading value, display maximum / mini­mum / mean value

Connections

 Socket “1” and socket “2”:

Thermocouple probe (type K), NTC probe, pressu-

re probe, power supply cable

 “RS232”: PC connection
 12 V DC mains unit (0554 0088)
Pressure nipple p+ with quick-release connection

(M8 x 0.5) (only for testo 526)

 Pressure nipple p- with quick-release connection

(M8 x 0.5) (only for testo 526)

3. Product description

3.1 Power supply

8



























 

Display

 Header (see detailed explanation of icons below:

Icons in the header)

 Designation of internal sensor or input socket 1

with selected channel and parameter unit



Reading

1

 Designation of input socket 1 or 2 with selected

channel and parameter unit



Reading

2

 Measuring functions

Icons in the header:

Counter for identifying the stored logs in the case of
manual, automatic and fast storage of the measure­ment series.

Counter for identifying the measurements in a measure­ment series in the case of automatic and fast storage

.

Appears: manual saving set.
Flashes: current

readings

saved.

Appears: automatic saving set.
Flashes: automatic saving running.

The memory content will be cleared.

Appears: printing possible.
Flashes: print function activated.

Battery / rechargeable batter capacity:
All segments dark: rechargeable battery/battery full.
All segments light, flashing: Battery / rechargeable bat­tery empty. The instrument switches off automatically
after 1 min.

3. Product description

3.2 Controls

9

M.

N 0000













3. Product description

3.3 Menu overview

10

Memory menu

1 Manual /
Automatic/
Fast

2 Configuration
3 Print
4 Status
5 Delete

Units menu

1 Pressure low
2 Pressure high
3 ISO/US
4 °C/°F

Input menu

1 Temperature
2 Humidity
3 Pressure
4 Density
5 Section
6 Offset factor
7 Pitot tube factor

Surface menu

1 Circle 1
2 Circle 2
3 Rectangle 1
4 Rectangle 2
5 Area 1

Service menu

1 Data
2 Language
3 Battery Type
4 Factory Reset

Probe menu

1 Socket 1
2 Socket 2

Channel menu

1 Surface
increment

2 Scaling U/I
3 Reset

Instrument menu

1 Date/Time
2 Auto. off
3 Unit

4 Damping
5 Optional

Measurement
menu

= 5 Instrument —> 3 Unit
—> 2 P High

3.3 Menu overview

: Open menu, : Select menu, : Back

The menu numbers appear in the topmost line of the display. Example: testo 521

53 2

Main menu

testo 521 testo 526

1 Location 1 Location
2 Memory 2 Memory
3 Probes 3 Probes
4 Input
5 Device 4 Device
6 Service 5 Service

Option menu

testo 521 testo 526

1 Velocity 1 P1-P2
2 Volume Flow 2 Leak Rate
3 P1-P2
3 Tightness

test

3. Product description

3.3 Menu overview

11

MUF menu

1 Input
2 Unit
3 Resolution
4 Output

MUF word menu

1 Voltage/current
2 Temperature
3 Humidity
4 Velocity
5 Pressure
6 Analysis
7 Other

Units

Pa (ISO/US)
hPa (ISO/US)
mbar (ISO/US)
kPa (ISO/US)
bar (ISO/US)
psi (ISO/US)
mmWs (ISO)
Torr (ISO)
„HG (US)
„H2O (US)

Units

hPa (ISO/US)
mbar (ISO/US)
kPa (ISO/US)
bar (ISO/US)
psi (ISO/US)
mmWs (ISO)
Torr (ISO)
„HG (US)
„H2O (US)

Test menu

1

Slowdown time
2 Test time
3 Nominal

pressure
4 dP Required
5 Measuring Rate
6 Start test

4. Commissioning

4.1 Inserting the battery / rechargeable battery

12

4. Commissioning

Charge batteries properly!

Danger of explosion!

Only start the charging process if a recharge-

able battery is in the instrument and Rech.
has been set as the battery type.

4.1 Inserting the battery /
rechargeable battery

(Rechargeable battery type: NiMH IEC 6F22)

1 Open the battery compartment on the rear of the

instrument.

2 Insert the monobloc battery / rechargeable battery.

Observe +/-.

3 Close the battery compartment.

To avoid the loss of data, it is imperative that you
switch the instrument off when changing the
battery/rechargeable battery and replace the
battery in < 10 min.

4.2

Using the power unit

The instrument can be operated with mains unit
0554 0088, without a battery/rechargeable battery.

The instrument switches on automatically when the
power unit is connected.

It is normal for the mains unit to warm up. The mains
unit has a thermostatic switch to protect it against
overheating.

Caution

4.3 Connecting probes/sensors

Connect the probes / sensors before switching the
instrument on. Probe-specific characteristics are only
read in when the instrument is switched on. Make
sure the connections are secure, but do not use force!

Connect the plug/hoses of the probes/sensors to

the corresponding connections of the instrument:

1 Pressure hoses at p+ and p-

Make sure the pressure hose does not jump
away from the connection socket!

Risk of injury!

Always use the screw locking device to secu-

re the pressure hose at pressures above 700
hPa.

2 Socket „1“ and socket „2“:

Thermocouple probe (type K), NTC probe, pressu­re probe, power supply cable

4. Commissioning

4.3 Connecting probes / sensors

13

Caution

14

5. Basic operating steps

5. Basic operating steps

5.1 Switching on / off

5.1 Switching on/off

Switching on

Connect the required probes/sensors before swit-

ching on.

1 Switch the instrument on with

.

 A display test will follow: all segments of the display

will light up for approx. 1 sec.



Automatic probe detection will be carried out. The
supply voltage and the actual time will be displayed.

Set the language in which the menus are to be dis-

played.

You must set the language before the instrument is
used for the first time or after a factory reset.

Select the language with

or and confirm

with

. The selection is stored and will be dis­played automatically the next time the instrument is
switched on.
You can change a menu setting later via the menu
item Service->Language.

 The current readings are displayed. The instrument

is now operational.

The reading of the internal sensor is displayed in

the upper line.

The reading of an externally connected probe

appears in the lower line.

If two probes are connected externally, the measu-

rement of the internal sensor is deactivated.

-Left probe socket: upper line

-Right probe socket: lower line

i.1 hPa

10.08

1.1 °C

24.8

M.

MAN.

00

Language

English

5. Basic operating steps

5.2 Menu navigation

15

Switching off

Readings which are not saved will be lost when the
instrument is switched off!

Switch the instrument off with .

5.2 Menu navigation

Operation is organised into 3 levels:

- Measurement menu

- Main and submenus

- Configuration menus

1 Open the main menu with and return to the

measurement menu with

.

2 Select the menu with

or and confirm

with

.

3 Repeat step 2 until you reach the function level.

4 You can make entries with

or , depen-

ding on the menu item. Confirm the entry with

.

- The current value will be displayed.

Details about the setting and adjustment options for
the individual functions can be found under 6. Menu
functions.

Go back one menu level with .

6. Menu functions

6. Menu functions

6.1 Measurement location

16

6.1 Measurement site

1 Choose the measurement location In the main

menu with

or .

- The location that is currently set will be displayed.
If a measurement location was allocated via the
testo ComSoft software, this is displayed as well.

- If data is already stored for the chosen location,
illuminates.

2 Activate setting mode with

.

- The measurement location that is currently set flas­hes.

- A location is created when the unit is first commis­sioned. Up to 98 additional locations can be
added. Press the

key until NEW appears in the

lower line. Confirm with

. A new measure-

ment location has been created.

3 Select the desired measurement location with

or

and confirm the selection with .

- Adjustable values flash.

Location

01

1

Location

NEW

1

521

526

17

6. Menu functions

6.1 Measurement location

6.2 Memory

In the main menu, choose the measurement location
with

or

.

Select required location with

or

and confirm with

.

1 In the main menu, select Memory with

or

and confirm the selection with .

2 Select the desired function with

or .

3 Activate setting mode with

.

- Adjustable values flash.

6.2.1 Man./Auto./Fast

Press or to select Manual, Automatic or
Fast and confirm the selection with

.

- Manual
save current readings

- Automatic
start a measurement program that will be saved

- Fast
save 25 measurements per second automatically

Only 1 channel can be analysed during a fast mea-

surement. Fast measurement only possible
with pressure probes or internal pressure sensor.
The following order applies during the fast
measurement:

- External pressure sensor before internal pressure
sensor

- Channel 2 before Channel 1.

Start the required save with the

key. The save
process is indicated by a flashing memory icon in the
display. Cancel saving with the

key.

Memory

MAN.

2

Man./Auto.

Manual

Auto.

Fast

MAN.

21

521

526

521 526

18

6.2.2 Configuration

(only available in the Fast/Automatic measurement
program)

Set how the measurement program is to function.
Measurement program Auto.

4 Set the measuring rate in hrs., min. and sec. with

or . Hold the key down to go forward/
back quickly. Every time 60:00 min. is passed, the
hour value increases. Confirm the selection with

.

5 Select the number of measurements with

or

(hold the key down to go forward/back
quickly) and confirm the selection with

. The
duration of the measurement series is displayed in
the upper line for your information.

Measurement program Fast (20 measurements
per sec.

)

4 Select the number of measurements with or

(hold the key down to go forward/back

quickly) and confirm the selection with

.

6.2.3 Printing

The logs stored for a measurement location, e.g.
the reading and other available parameters (density,
temperature, humidity, pressure, cross-section, offset
factor, Pitot tube factor) are printed.

4 Select the log with

or (hold the key
down to go forward/back quickly) and confirm the
selection with

.

5 Printout starts

- The data is sent to the printer via the infrared inter­face.

flashes during data transmission.

If the key in the measurement menu is pres­sed, the reading currently stored is printed out.

If no log is stored the display shows “Error”.

6. Menu functions

6.2 Memory

h min.

820

Quantity

200

22

MeasR. hrs.

00

min. sec.

02:30

22

Print

Log

03

23

521

526

521

526

6. Menu functions

6.2 Memory

19

Printout of current reading in the measurement menu

Printout after measurement has finished

6.2.3.1 Data transfer

The transmission path should not be obstructed by
obstacles of any kind.

Date: 27.08.2003
Time: 10:15:35

Testo AG

Location: 01

Meas. from: 27.08.2003
Time: 10:15:35

1.1: 918 hPa

2.1: 27.0 °C

Date: 27.08.2003
Time: 10:15:35

Testo AG

Location: 01

Date Time
from:

27.08.2003 10:15:35

to: 27.08.2003 10:25:35

hh:mm:ss
Meas. rate : 00:01:00

1.1: hPa 2.1: °C
00001 27.08.2003 10:15:35
01 917 26.8

02 918 26.8
03 917 26.8
04 917 26.8
05 917 26.8
06 917 26.9
07 917 26.9
08 918 26.8
09 918 26.8
10 918 26.9

60°

10°

20°

60°

max. 2 m

6. Menu functions

6.2 Memory

20

6.2.4 Status

Indicates the available memory space as a %.

6.2.5 Clearing

The Clear menu item allows the entire memory to be
cleared.

- It is not possible to clear individual logs or
measurement locations.

4 Select Yes or No with

or and confirm

the selection with

.

- If you select Yes: the memory content will be clea­red.

- If you select No or

: the process will be can-

celled.

Status

Free %

65.5

24

Clear

Yes

25

521

526

521

526

21

6.3 Probes

Menu is activated only if external probes are
connected.

1 In the main menu, select Probes with

or

and confirm the selection with .

2 Select the desired socket with

or and

confirm the selection with

.

3 Select the desired function with

or .

4 Activate setting mode with

.

The following control operations for the functions Sur-
face increment, Scaling U/I and Probe reset apply
equally for the Socket 1 and Socket 2 menus.

Different units are available, depending on which
standard was chosen (ISO or US). See 6.6.3 Unit

6.3.1 Surface increment (SI)

This function is only visible if a temperature probe is
connected.
Set which surface increment (SI) is to be calculated in
addition to a surface increment stored in the probe.

The surface increment is the percentage increment
for the measured thermocouple voltage of surface
probes.

5 Select the increment (0 - 30 %) with

or .
Hold the key down to move forward/back quickly.
Confirm the selection with

.

Socket 2

32

SI

%

2.00

32 1

521

526

521

526

22

Menu Units

U/I V mA A mV
Temp. °C °F
Humidity % °Ctd g/m

3

g/kg °Ftd

Velocity m/sec m

3

/hr fpm cfm
Pressure Pa psi Torr mmWS kPa mbar bar hPa „H2O „HG
Analysis mS mg/l pH S
Other 1/m User % ppm kHz

22

Units

521

526

6. Menu functions

6.3 Probes

Input

- 0 V - 10 V (for power supply cable
0554 0007)

- 0 V - 1 V (for power supply cable
0554 0007)

- 4 mA - 20 mA (for power supply cable
0554 0007

or 4 - 20 mA interface

0554 0528)

- 0 mA - 20 mA (for power supply cable
0554 0007

or 4 - 20 mA interface

0554 0528)

521

526

6.3.2 Scaling U/I

This function is only visible if the 4 - 20 mA interface
(0554 0528) or the power supply cable (0554 0007) is
connected.

Select the scaling factors for the transmitter.

5 Select Scal. U/I with

or and confirm the

selection with

.

6 Activate the „Input“, „Unit“, „Resolution“ or „Out-

put“ menus with

.

7 Select parameters with

or and confirm

the selection with

.

Scal. U/I

%

31 2

521

526

23

Setting the output

Scaling takes place when the unit has been selected.

Example: 4 - 20 mA should correspond to

0 - 100 % in the subsequent display.

Entering the min. value

Set the 4 mA value (corresponds to 0%) with

or

= 0 % (hold the key down to move for-

ward/back quickly) and confirm the selection with

.

Entering the max. value

Set e.g. the 20 mA value (corresponds to 100 %)

with

or (hold the key down to move for-

ward/back quickly) and confirm the selection with

.

6. Menu functions

6.3 Probes

Resolution
Selecting decimal places

Place Min. value Max. value

0 -9999 to 99999
1 -999.9 to 9999.9
2 -99.99 to 999.99

6.3.3 F-Reset

Select whether you want to reset the probe / sensor
data to the standard values (factory setting).

5 Select Yes or No with

or and confirm

the selection with

.

- If you select Yes: probe / sensor data will be reset.
If you select No or

: the process will be can-

celled.

521

526

521

526

521

526

24

6. Menu functions

6.4 Input

6.4 Input

For velocity measurement with the Pitot tube, the
internal pressure sensor 0 - 100 hPa is the best for
velocities from 5 - 100 m/s. For measurements in the
range of 1 - 12 m/sec., use the external differential
pressure probe 0638 1347 with measuring range
0 - 100 Pa. The velocity v is calculated in the instru­ment from the pressure difference p in the Pitot tube
according to the following formula:

v [m/sec.] = S x

200000 x p [hPa]

rho [g/m

3

]

To activate the velocity rate measurement and volume
flow rate calculation, please refer to chapter 6.5.6.
Alternatively, it is possible to enter the variables which
influence the air density at the measuring location:

- temperature (see point 6.4.1)

- relative humidity (see point 6.4.2)

- absolute pressure (see point 6.4.3)

Additional input options for calculating the velocity or
volume flow rate are the

- cross-section (see point 6.4.5)

- offset factor (see point 6.4.6)
Calculation formula:

V [m

3

/h] = K x v [m/s] x A [m2] x 3600

- Pitot tube factor (see point 6.4.7)

1 In the main menu, select Input with

or

and confirm the selection with

.

2 Select the required function with

or .

3 Activate setting mode with

.

521

Input

4

.

25

6.4.1 Temperature

Set the temperature which is to be used to calculate
the density.

4 Select the temperature with

or .
(-100 °C - 800 °C) (hold the key down to go for­ward / back quickly) and confirm the selection with

.

6.4.2 Relative humidity

Set the humidity which is to be used to calculate the
density.

4 Select the humidity (0 - 100 %) with

or
(hold the key down to go forward / back quickly)
and confirm the selection with

.

6.4.3 Absolute pressure

Set the absolute pressure which is to be used to cal­culate the density.

4 Select the pressure (400 - 4000 hPa) with

or

(hold the key down to go forward / back

quickly) and confirm the selection with

.

6.4.4 Density

The density is calculated automatically after the fac­tors of temperature, humidity and absolute pressure
have been entered. If you set the value for the density
directly, no values are displayed for temperature,

humidity and pressure (display: - - - - -).

4 Select the density (1 - 9999.9 g/m

3

) with or

(hold the key down to go forward / back

quickly) and confirm the selection with

.

6. Menu functions

6.4 Input

521

521

521

521

Humidity

%

48.5

42

Pressure

hPa

1013

43

Density

g/m3

11993

44

Temp.

°C

20.0

41

26

6.4.5 Cross-section

Set the cross-section for

- circle 1 (Ø in mm)

- circle 2 (Ø in mm)

- rectangle 1 (a x b/height x width in mm or inch)

- rectangle 2 (a x b/height x width in mm or inch)

- area (m

2

)

that is to be used to calculate the volume flow rate.
The shapes listed are contained in the instrument as
standard. The shapes can be changed using the soft­ware (e.g. five circles).

4 Select the desired function with

or .

5 Activate setting mode with

.

6 Select the value with

or (hold the key
down to go forward / back quickly) and confirm the
selection with

.

7 Enter the next cross-section. To set the next valu-

es, repeat steps 2 - 6 .

6.4.6 Offset factor (O factor)

Set the offset factor that will be used to calculate
readings. The factor is stored with the cross-section.
The factor changes when another cross-section is
activated. The O factor depends on the outlet. The K
factor affects the calculated volume flow directly. For
standard applications the factor should be 1.

4 Select the O factor (0.01 - 10) with

or
(hold the key down to go forward / back quickly)
and confirm the selection with

.

6.4.7 Pitot tube factor (P factor)

Set the Pitot tube factor that will be used to calculate
readings.

- Testo standard Pitot tube (Prandl), factor 1

- Straight Pitot tubes, factor 0.67

4 Select the P factor (0.01 - 500) with

or
(hold the key down to go forward / back quickly)
and confirm the selection with

.

6. Menu functions

6.4 Input

521

521

521

Section

Circle 1

45

O factor

1.00

46

P factor

1.00

47

Circle 1

mm

50

45 1

27

6. Menu functions

6.5 Device

6.5 Instrument

In the main menu, select Instrument with or

and confirm the selection with .

2 Select the desired function / menu with

or

.

Select Optional:
Confirm the selection with

and select the

desired function with

or .

3 Activate setting mode with

.

6.5.1 Time

Set the time and date.
Time

4 Set the hour with

or (hold the key down
to go forward / back quickly). The value to be
changed flashes. Confirm the setting with

.

Repeat this step to set the minutes.

Date
5 Set the day with

or (hold the key down
to go forward / back quickly). The value to be
changed flashes. Confirm the setting with

.

Repeat the step to set the month and year.

521

526

521

526

521

526

51

51

hh:mm

10:24

41

DD.MM

29.08

YYYY

2003

41

Device

4

5

28

6. Menu functions

6.5 Device

6.5.2 Auto. Off

Set whether the instrument is to switch off automati­cally after 10 min. without any key being pressed.

4 Select On or Off with

or and confirm

the selection with

.

- If you select On: the instrument will switch off auto-

matically after 10 min.

If you select Off: the instrument will not switch off

automatically.

6.5.3 Unit

Low pressure (P low) (probe up to 2000 hPa)

Set the unit in which the pressure is to be displayed.
The selected unit will be displayed in measurements
with the internal pressure sensor and all external pres­sure probes (differential and absolute pressure pro­bes) with a measuring range between 0 - 2000 hPa.

The following units are available:

- hPa, Pa, psi, Torr, kPa, mbar, bar for ISO/US

- Torr, mmWs for ISO

-

„H2O, „HG for US

4 Select the desired unit with

or and

confirm the selection with

.

High-pressure (P high) (probe from 2000 hPa). Set
the unit in which the pressure is to be displayed. The
selected unit will be displayed in measurements with
the external relative pressure probes with a measuring
range between -1 and +400 bar.

The following units are available:

- hPa, psi, kPa, mbar, bar for ISO/US

- Torr, mmWs for ISO

-

„H2O, „HG for US

4 Select the required unit with

or and

confirm the selection with

.

521

526

521

526

521

526

52

42

53

53 1

hPa

43 1

53 2

bar

43 2

Auto. off

Off

Unit

P Low

P Low

P High

29

6. Menu functions

6.5 Device

ISO/ US

Set whether European (metric) or US units are to be
displayed.

The following units will be converted:

- m

2

- ft2, mm - inch, g/m3 - gr/ft3, m/sec. - fpm,

m

3

/h - cfm, units of pressure

4 Select ISO or US with

or and confirm

the selection with

.

°C /°F

Set whether temperatures are to be displayed in units
of °C or °F.

4 Select °C or °F with

or and confirm the

selection with

.

6.5.4 Damping

If the readings fluctuate widely, it is advisable to damp
the readings.
Set the damping which is to be used to calculate rea­dings.

Damping is the sliding mean calculation over n
values (n can be set in instrument).

4 Set damping (1 - 20) with

or (hold the
key down to go forward / back quickly) and confirm
the selection with

.

521

526

521

526

521

526

53 3

ISO/US

43 3

55

1

45

°C/°F

°C

43 4

53 4

Damping

30

6.5.5 Optional

Velocity

Set whether the calculated velocity is to be shown on
the display.

4 Select On or Off with

or and confirm

the selection with

.

- If you select On: the calculated velocity will be

shown on the display.

If you select Off: the calculated velocity will not be

shown on the display. Volume flow is automatically
at Off.

Volume flow

Set whether the calculated volume flow is to be
shown on the display.

4 Select On or Off with

or and confirm

the selection with

.

- If you select On: the calculated volume flow will be

shown on the display. Flow is activated automati­cally.

If you select Off: the calculated volume flow will not

be shown on the display.

6. Menu functions

6.5 Device

521

521

521

526

56

On

56 1

56 2

Optional

46

Velocity

VolFlow

Off

31

6. Menu functions

6.5 Device

Delta P

Set whether the differential pressure of two pressure
probes is to be shown on the display.

Calculating the differential pressure (P1-P2):
If one external pressure probe is connected, the diffe­rential pressure is calculated from the internal pressu­re sensor (P1) and external pressure probe (P2). If two
external pressure probes are connected, the internal
pressure sensor is deactivated. The differential pres­sure is calculated from the external pressure probes.

4 Select On or Off with

or and confirm

the selection with

.

- If you select On: the differential pressure will be

shown on the display.

If you select Off: the differential pressure will not be

shown on the display.

Leakage rate

Set whether the leakage rate (p/hr. or p/min.) is to
be calculated and shown on the display. The leakage
rate is always calculated for just one channel. The
channel to be measured is selected automatically
according to the following rule:

- external probe before internal probe

- measuring channel 1 before measuring channel 2

4 Select p/hr. or p/min. with

or and

confirm the selection with

.

Measurement starts and the pressure reading is dis­played immediately. After about 10 sec. the first pres­sure difference will be displayed and updated conti­nuously. Measurement can be restarted at any time
by pressing the key

. Press or to end

measurement.

Tightness test

The tightness test menu is used in order to analyse
the pressure loss of the vessel, pipes, lines etc.

The steps for performing the tightness test “ The
tightness test menu is used in order to analyse the
pressure loss of the vessel, pipes, lines etc.

521

526

56 3

P1-P2

On

46 1

46 2

46 3

909

-2

526

526

LeakRate

LeakRate

dP/min.

Test

32

The steps for performing the tightness test “Test with
air”, based on the standard DIN EN1610 “Construc­tion and testing of drains and sewers”, are outlined in
the instrument menu:

- Enter the set slowdown time (tSlDoReq)

- Enter the set test time (tTestReq)

- Enter the set test pressure at which the measure­ment is to take place (P Req.)

- Enter the permitted pressure drop p in hPa

that is critical in order to assess whether the pipeline

is leaking or not (P Req.)

The test can start once the required values according
to the standard have been entered. It is divided into
5 areas:
Time zone areas:

- Pre-fill time

Build-up of the pressure in the pipe system and the

actual duration.

- Slowdown time

Measurement of the pressure, which should
exceed

the test pressure required by the standard
by about
10 % over 5 min. and which records the actual duration.

- Test time
Record of the actual test duration.

- Drop time
Record of the duration of the pressure drop in the

line.

When the test has come to an end the individual
required and actual test data can be printed out on
the printer or automatically imported into a test log via
the ComSoft software.

Slowdown time (tSlDoReq)

Set the required time. According to DIN EN1610, it
should be about 5 min.:
A starting pressure that exceeds the necessary test
pressure p

o by about 10 %. po must first be main-

tained for 5 min.
4 Select tSlDoReq (0 sec. to 99 min., 59 sec.) with

or (hold the key down to move for-

ward / back quickly. Confirm the selection with

. You automatically return to the tTestReq

menu.

6. Menu functions

6.5 Device

tSlDoReq.

min. sec.

05:00

46 31

33

6. Menu functions

6.5 Device

Test pressure, pressure drop and test times for testing with air
Material Method Po* p Test time (min.) for

in mbar DN DN DN DN DN DN DN DN DN
(kPa)

100 150 200 300 400 600 800 1000 1200

Dry concrete pipes

LA

10 2.5

5 5 5 5 7 11 14 18 22

(1) (0.25)

LB

50 10

4 4 4 4 6 8 11 14 17

(5) (1)

LC

100 15

3 3 3 3 4 6 8 10 12

(10) (1.5)

LD

200 15

1.5 1.5 1.5 1.5 2 3 4 5 6

(20) (1.5)
Kp x value** 0.058 0.058 0.053 0.040 0.0267 0.020 0.016 0.013
Moist concrete pipes

LA

10 2.5

5 5 5 7 10 14 19 24 29

and all other (1) (0.25)
materials

LB

50 10

4 4 4 6 7 11 15 19 22

(5) (1)

LC

100 15

3 3 3 4 5 8 11 14 16

(10) (1.5)

LC

200 15

1.5 1.5 1.5 2 2.5 4 5 7 8

(20) (1.5)
Kp x value** 0.058 0.058 0.040 0.030 0.020 0.015 0.0012 0.010

* Pressure above atmospheric pressure

**

ln = log

0

For dry concrete pipes with a maximum value of 0.058.

For moist concrete pipes and all other materials with a maximum value of 0.058, where t < 5
min. rounded to the nearest 0.5 minutes and t > 5 min. rounded to the nearest minute.

t = 1 x ln

P

o

K

p

Po-

p

Kp =

16

DN

Kp =

12
DN

Test time (tTestReq)

Set the test time during which the pressure drop is
monitored. The test time is taken from DIN EN 1610
(see table below). For a fast input please use the
ComSoft 0554 0830.

5 Activate setting mode with

. Select tTestReq

(1 min. to 99 hr., 59 min.) with

or (hold
the key down to more forward / back quickly) Con­firm the selection with

.

You automatically return to the P Req. menu.

tTestReq.

hr. min.

00:10

46 32

34

Required test pressure po (P Req.)

Set the required test pressure at which measurement
is carried out. Required test pressure according to
DIN EN1610 (see table on previous page).

6 Activate setting mode with

Select the P Req.

value with

or (example: 0.0mbar to

9999.9mbar) (hold the key down to move for­ward / back quickly. Confirm the selection with

.

You automatically return to the menu.

Permitted pressure drop P (P Req.)

Set the maximum permitted pressure drop P. At
the end of measurement, this value is used to decide
whether the test piece is leaking or not. Required
pressure drop P according to DIN EN1610 (see table
on page 33).

7 Activate setting mode with

. Select the

P Req. value with

or (example:

0.0mbar to 9999mbar) (hold the key down to
move forward / back quickly). Confirm the selection
with

.

You automatically jump to the measuring rate

menu.

Measuring rate

Set the measuring cycle at which the changes in pres­sure are recorded.

8 Activate setting mode with

Select the measu-

ring rate (1 sec to 24h) with

or (hold the
key down to move forward/ back quickly. Confirm
the selection with

.

Start

Start the test with the set parameters.
The entire measurement process is stored in the ins­trument.

9 Activate start mode with

.

Cancel testing with

.

6. Menu functions

6.5 Device

dP Req.

mbar

150

46 34

measR. hr.

00

min. sec.

00:01

46 35

P Req.

mbar

9999.9

46 33

Start?

46 36

35

6. Menu functions

6.5 Device

Phase 1: Pre-fill time
Build-up of the pressure in the pipe system and the

actual duration.

Jump to the slowdown time menu automatically with

.

Phase 2: Slowdown time
Measurement of the pressure, which should exceed
the test pressure required by the standard by about
10 % over 5 min. and which records the actual dura­tion.
Jump to the test time time menu automatically with

.

Graphic overview of the measurement process

1.1 hPa

926

Pre-fill

01:05

i.1 hPa

926

SlowDown

01:05

1

2

3

4

5

Pre-fill

time

Test time

Drop

time

Slowdown

time

P

t

36

6. Menu functions

6.5 Device

Phase 3: Test time
Recording of the actual test duration.
Jump to the drop time menu automatically with

.

Phase 4: Drop time
Record of the duration of the pressure drop in the line.

Jump to the end of measurement menu automatically
with

.

Phase 5: End of measurement
At the end of measurement, the full pressure difference
is displayed and the readings are analysed in order to
determine whether or not the system is to be classed
as leaking.
Press the

key to print out the measurement
result. All values are given in bar to enable compari­son.

Return to the measurement menu with

. The last

log to be saved is displayed.

1.1 hPa

926

 P

3

0030

1.1 hPa

926

Drop

0030

Leak

 P hPa

2

0030

37

6.6 Service

1 In the main menu, select Service with or

and confirm the selection with .

2 Select the required function / menu with

or

.

Confirm the selection with

and select the

required function with

or .

3 Activate setting mode with

.

6.6.1 Data

Indicates the battery
voltage and firmware
version. When the

key is pressed
all information stored
in the instrument will
be printed out.

6.6.2 Language

Set the language in
which the menus are
to be displayed.
The following langua­ges are available:
German, English,
Italian, Spanish,
Portuguese, French,
Dutch, Swedish

4 Select the langua-

ge required with

or and
confirm the selecti­on with

.

6. Menu functions

6.6 Service

Date: 27.08.2003
Time: 10:15:35

Testo AG

Location: 01

Data

Mustermann
Max
Testo Str. 1
Testo AG
07653/681-0

InstrumentType: t521
Version : 0.14
Serial number: 00000021
Battery : 8.5V

Memory: Manual
hh:mm:ss
Measr.: 00:01:00
Free: 78%

U/I 1:
Input: 0mA - 20mA
Output: 0.0 - 20.0
Unit :

U/I 2:
Input: 0mA - 20mA
Output: 0.0 - 20.0
Unit:

Temp.: 20.0 °C
Humidity: 50.0 %
Pressure: 1013 hPa
Density : 1199.0 g/m

3

P factor : 1.00
Section. : 0.002 m

2

O factor : 1.00

Printout data

521

526

521

526

521

526

6

Service

5

61

51

62

52

Version

0.10

BAT V

8.4

Data

Language

English

38

6. Menu functions

6.6 Service

6.6.3 Bat. type

Set whether an ordinary battery or a rechargeable bat­tery is inserted in the instrument.

The battery in the instrument can only be recharged
if it is a rechargeable battery and this is set as the
battery type.

Only set the battery type as Rech. if a recharge-

able battery is actually fitted in the instrument.

4 Select Battery or Rech. with

or and

confirm the selection with

.

6.6.4 F-Reset

Choose whether you want to reset the instrument set­tings to the defaults (factory settings).

The internal memory is cleared when an F-Reset is
carried out.

The following values are reset in the instrument:
Auto. off: On
Temperature: 20 °C
Humidity: 50 % RH
Absolute pressure: 1013 hPa
Density: 1199 g/m

3

Area: 1 m

2

Pitot tube factor: 1
Offset factor: 1
Unit of temperature: °C
Units: ISO
Unit of pressure: hPa
Saving: manual
Battery type: Battery
Language: English
Damping: 1 = no damping
No calculated parameters activated

4 Select Yes or No with

or and confirm

the selection with

.

- If you select Yes: the instrument settings are reset

to the defaults (factory settings).

If you select No or

the instrument settings are

not reset.

521

526

521

526

63

Bat.type

Battery

53

64

F-Reset

54

F-Reset

Yes

39

7. Measuring

7.1 Zeroing the display

The measurement values can be falsified by a

change in the position of the measuring instrument.
After zeroing, the position of the measuring instrument
must not be changed. Carry out zeroing before every
measurement in order to compensate faulty positi­oning or long-term zero-point drift. For the display
of the internal pressure to be zeroed, the instrument
must be in the measurement menu and there must be
a differential pressure of < 2.5 % of the full-scale value
(at testo 5213 reset <20% of the full scale value).

Zero the display values of all connected (zeroable)

pressure probes with

.

Zeroing is lost when the instrument is switched off.

7.2 Selecting readings

If velocity or volume flow is activated, these values are
displayed in the upper line by pressing the

key.

Select required reading 2 (bottom line) with .

7.3 Activating measuring func-

tions

The instrument has the following measuring functions:

- Hold value (Hold)

- Display maximum value (Max.)

- Display minimum value (Min.)

- Calculate spot mean value (Mean)

- Calculate chronological mean (Mean

)

For the measuring functions to be called up, the inst­rument must be in the measurement menu.

Select the measuring functions one after the other

with

:

Hold

The last readings are held in the display.

7. Measuring

7.1 Zeroing the display

521

526

521

526

i.1 hPa

10.08

1.1 °C

24.8

M.

MAN.

00

i.1 hPa

10.08

1.1 ?C

24.8

Hold

M.

MAN.

00

Max.

Min.

Mean Mean

i.3 m3/h

23

2.1 °C

22.6

M.

MAN

02

521

24.8

Hold

521

526

40

Max.

The highest readings since the start of measurement

are displayed.

Min.

The lowest readings since the start of measurement

are displayed.

Mean

1 Activate calculation of the spot mean value with

.

- Mean flashes.

2 Record the reading for the calculation with

.

3 Repeat step 2 as required.

- The number of recorded readings is shown in the
topmost line in the display.

4 Calculate the spot mean value with

.

- The calculated mean value is displayed and can be
stored or printed out.

- Save readings with

- Print readings with

Reactivate calculation of the mean value with

and record additional readings with

.

Cancel the process with .

Mean

1 Activate calculation of the chronological mean

value with

.

2 Start recording readings with

.

- Mean

flashes.

- A reading is recorded every second. The duration
since the readings started being recorded is shown
in the topmost line of the display.

3 Stop calculation of the mean values with

.

4 Calculate the chronological mean values with

.

- The calculated mean value is displayed and can be
stored or printed out.

- Save readings with

.

- Print readings with

.

7. Measuring

7.3 Activating measuring functions

521

521

526

521

526

521

526

30.5

Max

15.7

Min

521

526

i.1 hPa

10.08

1.1 °C

24.8

N

0011

Mean

i.1 hPa

10.08

1.1 °C

24.8

00:37

Mean

41

Reactivate calculation of the mean value with

and continue recording the measurement readings
with

.

Cancel the process with .

7.4 Saving readings

For the readings to be saved, the instrument must be
in the measurement menu.

Before you save the readings, you must select the
measurement location under which the data is to
be saved (see 6.1 Measurement location).

Manual save mode set (see 6.2.1 Man./Auto.):

4 Press

to save the current readings with the
date, time, measurement location and other availa­ble parameters.

-

flashes briefly.

.

Automatic save mode set (see 6.2.1 Man./Auto.):

4 Press

to start the set measurement program.

-

flashes for as long as the measurement
program is running. The save program can be
ended early by pressing

. Press again to save

a new series of measurements.

Fast save mode set (see 6.2.1 Man./Auto.):

4 Press

to start the set measurement program.

- 25 measurements are saved per sec. automatical­ly.

7. Measuring

7.4 Saving readings

521

526

i.1 hPa

10.08

2.1 °C

24.8

M.

MAN

05

i.1 hPa

10.08

2.1 °C

24.8

M.

N.

AUTO

05

0005

i.1 hPa

10.08

M.

AUTO

05

0005

N.

7. Measuring

7.5 Printing readings

42

7.5 Printing readings

To print all readings stored for a measurement locati­on (see 6.2.3 Printing)

To print individual readings, the instrument must be in
the measurement menu.

4 Press

to print out the current readings with
the date, time, measurement location and other
available parameters.

- The data is sent to the printer via the infrared inter­face.

flashes during data transmission.

521

526

Data transfer

The transmission path should not be obstructed by
obstacles of any kind.

60°

10°

20°

60°

max. 2 m

i.1 hPa

10.08

1.1 °C

24.8

M.

MAN

N.

03 0005

8. Care and maintenance 43

8. Care and maintenance

8.1 Changing the bat­tery / rechargeable battery

(Rechargeable battery type: NiMH IEC 6F22)

To avoid the loss of data, it is imperative that you
switch the instrument off when changing the bat­tery/rechargeable battery and replace the battery
in < 10 min.

1 Open the battery compartment on the rear of the

instrument.

2 Remove the empty monobloc battery / rechargeab-

le battery.

3 Insert the new monobloc battery / rechargeable

battery. Observe +/-.

4 Close the battery compartment.

Instrument will start automatically.

8.2 Charging the battery

Charge batteries properly!

Danger of explosion!

Only start the charging process if a recharge-

able battery is in the instrument and Rech.
has been set as the battery type.

The battery in the instrument can only be rechar­ged if it is a rechargeable battery and Rech. is set
as the battery type.

1 Make sure a rechargeable battery is in the instru-

ment.

2 Make sure that Rech. is set as the battery type

(see 6.6.3 Bat. type).

3 Connect the connector of the mains unit to the

12 V jack of the instrument.

44

4 Connect the mains plug to the mains socket.

5 Question as to whether rechargeable battery

should be charged. Select Yes with

and confirm with .

The charging process will start automatically.

flashes during the charging process and the

actual battery voltage is displayed.

- Automatically go to measurement menu.

8.3 Cleaning the instrument

If the housing of the instrument is dirty, clean it with

a damp cloth. Do not use any corrosive cleaning
agents or solvents! Weak household cleaning
agents and detergents may be used.

8. Care and maintenance

charge

no

459. Troubleshooting

9. Troubleshooting

Fault Possible causes Remedy

Instrument switches off after printing Battery voltage too low Replace battery
Display cannot be zeroed. The differential pressure is outside Make the differential pressure < 2.5%

the zeroable range. of full-scale value
and zero the probes again.

Saved settings and readings Factory reset was carried out or No remedy possible! Keep readings
are no longer held in the instrument. battery was removed. regularly in the software or on paper.

Velocity value is calculated incorrectly Density input incorrect Enter correct density
Velocity value is calculated incorrectly Pitot tube factor incorrect Enter correct Pitot tube factor.
Velocity value is calculated incorrectly Pressure probe not zeroed before Zero pressure probe (without applying

measurement pressure)
Volume flow is calculated incorrectly Offset factor or cross-section input incorrect Enter correct offset or

cross-section

If we were unable to answer your question, please contact your distributor or Testo
Customer Service. For contact data, see back of this document or web page www.
testo.com/service-contact

10.1 Measuring ranges and accuracies

Instruments testo 521-1, inte- testo 521-2 inte- testo 521-3, inte- testo 526-1 inte- testo 526-2 inte­ grated differential grated differential grated differential grated differential grated differential
pressure sensor pressure sensor pressure sensor pressure sensor pressure sensor
0560 5210 0560 5211 0560 5213 0560 5280 0560 5281

Sensor
Measuring range 0 - 100 hPa 0 - 100 hPa 0...250 Pa 0 - 2000 hPa 0 - 2000 hPa

Overload limit 300 hPa 300 hPa 50 hPa 3000 hPa 3000 hPa
Static pressure

1000 hPa (abs) 1000 hPa (abs) 1000 hPa (abs) 2000 hPa 2000 hPa
Accuracy* ±1 digit at ±0.2 % of full- ±0.1 % of full- ±0,5 Pa ±0.1 % of full- ±0.05% of full
at nom. temp. 22 °C scale value scale value (0...20 Pa) scale value scale value

and meas. cycle>1 s ±(0,5 Pa + 0,5%
of reading)
(20...250 Pa)

Resolution 0.01 hPa 0.01 hPa 0.1 Pa 0.1 hPa 0.1 hPa
(0 to 100 hPa) (0 to 100 hPa) (0 to 2000 hPa) (0 to 2000 hPa)

*The accuracy specification applies immediately after zeroing of the sensor.

Pressure probes

Pressure probes NTC Type K (NiCr-Ni)

Measuring range to 2000 hPa to 400bar -40 - +150 °C -200 - +1370 °C
Accuracy** ±0.1% of reading for ±0.2% of reading for

Probe 0638 1347 Probe 0638 1741 ±0.2 °C (-10 - +50 °C) ±0.4 °C (-100 - +200°C)
±1 digit Probe 0638 1447 Probe 0638 1841 ±0.4 °C (-40 - 10.1 °C) ±1 °C (-200 - 100.1 °C)

Probe 0638 1547 Probe 0638 1941 ±0.4 °C (+50.1 - +150 °C) ±1 °C (+200.1 ­+1370°C) Probe 0638 1647 Probe 0638 2041
Probe 0638 1747 Probe 0638 2141
Probe 0638 1847

Resolution 0.1 Pa (0638 1347) 0.01 bar (0638 1741) 0.1 °C (-40 - +150 °C) 0.1 °C (-200 - +1370 °C)

0.001 hPa (0638 1447) 0.01 bar (0638 1841)

0.01 hPa (0638 1547) 0.01 bar (0638 1941)

0.1 hPa (0638 1647) 0.01 bar (0638 2041)

0.1 hPa (0638 1747) 0.01 bar (0638 2141)

0.1 hPa (0638 1847)

Probe Current measurement Current/voltage Current/voltage
measurement measurement

Measuring range 0...20 mA 0 - 20 mA 0 - 10 V
Accuracy** Probe 0554 0528 0554 0007* 0554 0007*

±1 digit - ±0.04 mA (0 - 20 mA) ±0.01 V (0 - 10 V)
Resolution 0.01 mA (0...20 mA) 0.01 mA (0 - 20 mA) 0.01 V (0 - 10 V)

* Power supply cable
** Instrument accuracy data apply only to instrument (without connected probe)

46

10. Technical data

10. Technical data

10.1 Measuring ranges and accuracies

47

10. Technical data

10.2 Other instrument data

10.2 Other instrument data

Power supply 9 V monobloc (6LR61), alkaline manganese or mains unit 12 V DC
Probe interface Round 8-pin plug
PC interface ComSoft V3.4; connecting lead 0409 0178
PC RS232 interface
Printer interface Infrared
Measuring data memory approx. 25000 readings
Battery life in continuous use with 30h with alkaline manganese, 10 hrs. with rechargeable battery, 18 hrs. with

zinc internal pressure sensor carbon at 25 °C
Battery life with connected Dependent on transmitter connected

4 to 20 mA interface Recommendation: Use mains unit
Sensor Piezoresistive
Storage/ transport temperature -20 - +70 °C
Operating temperature

(temperature-compensated) 0 - +50 °C
Intrinsic leakage 0.3 % pressure drop from test pressure over a period of 1 minute
Display LCD display with symbol, 7-segment display and dot matrix part
Weight inc. TopSafe and battery approx. 600 g
Housing material ABS
Dimensions (L x W x H) 219 x 68 x 50
Measuring rate Auto 1s to 24h, fast 0.04s
Refresh rate of display 2 x per sec., with fast measurement 4 x per sec.
Other Automatic detection of all connected probes
Warranty 24 Months

48

11. Accessories / spare parts

11. Accessories / Spare parts

Article Order no.

Instruments

Differential pressure meter testo 521-1, accuracy ±0.2 % of full scale value 0560 5210
Differential pressure meter testo 521-2, accuracy ±0.1 % of full scale value 0560 5211
Differential pressure meter testo 521-3, accuracy ±0.5Pa (0 to 20Pa); ±(0.5Pa + 0.5% of reading) (20...250Pa) 0560 5213
Differential pressure meter testo 526-1, accuracy ±0.1 % of full scale value 0560 5280
Differential pressure meter testo 526-2, accuracy ±0.05 % of full scale value 0560 5281

Differential and absolute pressure probes

Differential pressure probe 100 Pa 0638 1347
Differential pressure probe 10 hPa 0638 1447
Differential pressure probe 100 hPa 0638 1547
Differential pressure probe 1000 hPa 0638 1647
Differential pressure probe 2000 hPa 0638 1747
Absolute pressure probe 2000 hPa abs 0638 1847

Relative pressure probes

Pressure probe 10 bar 0638 1741
Pressure probe 30 bar 0638 1841
Pressure probe 40 bar 0638 1941
Pressure probe 100 bar 0638 2041
Pressure probe 400 bar 0638 2141

Current/Voltage probes

Scalable probe for 4 - 20 mA 0554 0528
Power supply cable (±1 V; ±10 V, 20 mA) 0554 0007
Replacement terminal 0205 0026

Temperature probes

Globe thermometer for measuring radiant heat 0554 0670
Quick-action surface probe with sprung thermocouple strip, measurement range short-term to +500 °C 0604 0194
Quick-action surface probe with sprung thermocouple strip, measurement range short-term to +500 °C 0614 0194
Super quick-action surface probe, bent (probe tip at 90° angle), with sprung thermocouple strip 0604 0994
Super quick-action surface probe, bent (probe tip at 90° angle), with sprung thermocouple strip 0614 0994
Robust surface probe 0604 9993
Robust surface probe 0614 9993
Robust surface probe, bent (probe tip at 90° angle), suitable for confined spaces 0604 9893
Robust surface probe (probe tip at 90° angle), suitable for confined spaces 0614 9893
Robust surface probe with sprung thermocouple strip for high temperature range up to +700 °C 0600 0394
Pipe wrap probe for pipes with diameter of up to 2”, for flow/return temperature measurement in hydronic systems 0600 4593
Magnetic probe, adhesive power approx. 20 N, with magnets, for measurements on metal surfaces 0600 4793
Magnetic probe, adhesive power approx. 10 N, with magnets, for higher temperatures,
for measurements on metal surfaces 0600 4893
Miniature surface probe for measurements on electronic components, small motors 0600 1494
Roller surface probe 0600 5093
Fast response immersion/penetration probe 0604 0293
Fast response immersion/penetration probe 0614 0293
Super quick-action immersion/penetration probe for measurements in liquids 0604 0493
Super quick-action immersion/penetration probe for measurements in liquids 0614 0493
Super quick-action immersion/penetration probe for high temperatures 0604 0593
Super quick-action immersion/penetration probe for high temperatures 0614 0593

4911. Accessories / spare parts

Article Order no.

Temperature probes

Super quick-action immersion/penetration probe for measurements in gases and liquids with a thin, low-mass tip 0604 9794
Super quick-action immersion/penetration probe for measurements in gases and liquids with a thin, low-mass tip 0614 9794
Robust immersion/penetration probe made of V4A stainless steel, waterproof and oven-proof, e.g. for the food sector 0600 2593
Smelting probe for measurements in non-ferrous melting baths, with exchangeable measuring tips 0600 5993
Adapter to connect NiCr-Ni thermocouples and probes with open wire ends 0600 1693
Highly accurate air probe for air and gas temperature measurements with bare, mechanically protected probe 0610 9714

Pitot tubes

Pitot tube, 300 mm long, stainless steel, measures flow velocity 0635 2245
Pitot tube, 350 mm long, stainless steel, measures flow velocity 0635 2145
Pitot tube, 500 mm long, stainless steel, measures flow velocity 0635 2045
Pitot tube, 1000 mm long, stainless steel, measures flow velocity 0635 2345
Pitot tube, stainless steel, 360 mm long, measures flow velocity incl. temperature 0635 2040
Pitot tube, stainless steel, 500 mm long, measures flow velocity incl. temperature 0635 2140
Pitot tube, stainless steel, 1000 mm long, measures flow velocity incl. temperature 0635 2240

Accessories

Plug-in mains unit 230 V 0554 0088
Mains unit 120 V 0554 0077
9 V rechargeable battery for measuring instrument 0515 0025
Lead, 1.5 m long, connects probe with plug-in head to measuring instrument 0409 1745
Lead, 1.5 m long, connects probe with plug-in head to measuring instrument 0430 0143
Lead, 5 m long, connects probe with plug-in head to measuring instrument, PUR coating material 0430 0145
Lead, 2.5m long, for pressure probes 0638 1741, 0638 1841, 0638 1941, 0638 2041, 0638 2141 0409 0202
RS232 cable, connecting lead from PC to instrument (1.8 m) for data transfer 0409 0178
testo printer with 1 roll of thermal paper and 4 mignon batteries 0554 0545
Charger for printer (with 4 standard rechargeable batteries) 0554 0110
Spare thermal paper for printer (6 rolls) 0554 0569
Spare thermal paper for printer (6 rolls), measuring data documentation can be read for up to 10 years 0554 0568
TopSafe with magnet holder and carry belt 0516 0446
Magnetic holder for TopSafe 0554 0225
Connecting hose, silicone, 5 m long 0554 0440
Connecting hose set, 2 x 1 m, coiled, inc. 1/8” screw fitting 0554 0441
Quick release connection 0440 0525
System case (plastic) for instrument and accessories, enables safe and reliable storage 0516 0526
Transport case (plastic) for instrument and accessories, enables safe and reliable storage 0516 0527

Software

ComSoft 3 Professional with measuring data management incl. database, evaluation and graphics function, data analysis, trend curve 0554
0830

50 11. Accessories / Spare parts

Article Order no.

Temperature calibration certificates
ISO temperature calibration certificate, for air/immersion probes, calibration points -18 °C, 0 °C, 60 °C 0520 0001
ISO temperature calibration certificate, instruments with air/immersion probes, calibration points 0 °C, 150 °C, 300 °C 0520 0021
ISO temperature calibration certificate, instruments with surface probes, calibration points 60 °C, 120 °C, 180 °C 0520 0071
DKD temperature calibration certificate, for air/immersion probes, calibration points -20 °C, 0 °C, 60 °C 0520 0211
DKD temperature calibration certificate, for air/immersion probes, calibration points 0 °C, 100 °C, 200 °C 0520 0221
DKD temperature calibration certificate, surface temperature probe, contact, calibration points 100 °C, 200 °C, 300 °C 0520 0271

Pressure calibration certificates
ISO pressure calibration certificate, absolute pressure, 5 measuring points across the range (for 0638 1847) 0520 0125
ISO pressure calibration certificate, absolute pressure, 5 measuring points across the range

5/10/15/20/25Pa

(for 0560 5213, 0638 1347) 0520 0405
ISO pressure calibration certificate, differential and relative pressure, 5 measuring points across the range
(for 0638 1347, 0638 1741, 0638 1841, 0638 1941, 0638 2041, 0638 2141,

0560 5213) 0520 0005

ISO pressure calibration certificate, differential and relative pressure, 5 measuring points across the range
(for 0560 5210, 0560 5211, 0560 5280, 0560 5281, 0638 1447, 0638 1547, 0638 1647, 0638 1747) 0520 0025
ISO pressure calibration certificate, differential and relative pressure, 5 measuring points across the range
for 0560 5281 0520 0035
DKD pressure calibration certificate, diff. and relative pressure, 11 meas. points across the range (<0.1% of fsv.)
for 0560 5281 0520 0205
DKD pressure calibration certificate, differential and relative pressure, 6 measuring points across
the range (> 0.6 % of full scale value) (for 0638 1347, 0638 1741, 0638 1841, 0638 1941, 0638 2041, 0638 2141) 0520 0225
DKD pressure calibration certificate, absolute pressure, 11 measuring points across
the range (0.1 - 0.6 % of full scale value) (for 0638 1847) 0520 0212
DKD pressure calibration certificate, differential and relative pressure, 11 measuring points across
the range (0.1 - 0.6 % of full scale value) (for 0560 5210, 0560 5211, 0560 5280, 0560 5281,0638 1447,
0638 1547, 0638 1647, 0638 1747) 0520 0215
ISO scalable probe calibration certificate 0520 1000