TESTO 521 User 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.
Foreword2

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 parti-
cular attention is identified in these Operating Instructions by pictograms:
Warnings are identified by means of a warning triangle. The relevant signal word! indica-
tes 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 measure-
ments!
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 instru-
ments 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 calcula-
tion, 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 positi-
on 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 / mini-
mum / 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 measure-
ment series.
Counter for identifying the measurements in a measure-
ment 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 bat-
tery 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)
1Open the battery compartment on the rear of the
instrument.
2Insert the monobloc battery / rechargeable battery.
Observe +/-.
3Close 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:
1Pressure 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.
2Socket „1“ and socket „2“:
Thermocouple probe (type K), NTC probe, pressu-
re 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.
1Switch 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 dis-
played 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
1Open the main menu with and return to the
measurement menu with .
2Select the menu with or and confirm
with .
3Repeat step 2until you reach the function level.
4You 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
1Choose 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.
2Activate setting mode with .
- The measurement location that is currently set flas-
hes.
- A location is created when the unit is first commis-
sioned. 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.
3Select 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 .
1In the main menu, select Memory with or
and confirm the selection with .
2Select the desired function with or .
3Activate 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.
4Set 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
.
5Select 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.
)
4Select 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.
4Select the log with or (hold the key
down to go forward/back quickly) and confirm the
selection with .
5Printout starts
- The data is sent to the printer via the infrared inter-
face. flashes during data transmission.
If the key in the measurement menu is pres-
sed, 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.
4Select Yes or No with or and confirm
the selection with .
- If you select Yes: the memory content will be clea-
red.
- If you select No or : the process will be can-
celled.
Status
Free %
65.5
24
Clear
Yes
25
521 526
521 526