TESTO 552 User manual

Testo 552 - Digital Vacuum Gauge with Bluetooth
Instruction manual

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Content
1Safety and waste disposal ................................................................... 5
1.1 About this document..............................................................................5
1.2 Safety .....................................................................................................5
1.3 Waste disposal.......................................................................................6
2General technical data ......................................................................... 7
2.1 Bluetooth module...................................................................................8
3Description of the instrument ............................................................... 9
3.1 Use.........................................................................................................9
3.2 Instrument overview...............................................................................9
3.3 Displays overview.................................................................................10
3.4 Control keys overview..........................................................................11
3.5 Connection options overview...............................................................11
4Operation........................................................................................... 14
4.1 Connecting...........................................................................................14
4.2 Switching instrument on and off ..........................................................14
4.3 Switching background illumination on and off .....................................15
4.4 Setting units and AutoOff.....................................................................15
4.5 Displaying temperature values .............................................................18
4.6 Establishing a Bluetooth® connection.................................................18
4.7 Overview of operating controls ............................................................19
4.8 App options..........................................................................................19
4.8.1 Set “Language” .....................................................................19
4.8.2 Display Tutorial......................................................................20
4.8.3 Display testo website ............................................................20
4.8.4 Display App Info ....................................................................20
4.9 List, graphic diagram and table view ...................................................21
4.10 Exporting readings ...............................................................................21
4.10.1 Excel (CSV) Export ................................................................21
4.10.2 PDF Export ............................................................................21
4.10.3 Exporting a graph ..................................................................22
4.11 Operating as a probe on the testo 570 ................................................22

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5Maintenance ...................................................................................... 24
5.1 Changing batteries .............................................................................. 24
Cleaning the instrument .............................................................................. 24
6Tips and assistance ........................................................................... 26
6.1 Questions and answers ....................................................................... 26
6.2 Accessories and spare parts ............................................................... 26
7EC Declaration of Conformity............................................................. 27

1 Safety and waste disposal
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1Safety and waste disposal
1.1 About this document
•The instruction manual is an integral part of the instrument.
•Keep this document throughout the entire operating life of the instrument.
•Always use the complete original instruction manual.
•Please read this instruction manual through carefully and familiarise
yourself with the product before putting it to use.
•Pay particular attention to the safety instructions and warning advice in
order to prevent injury and damage to the product.
1.2 Safety
General safety instructions
•Only operate this instrument in the proper manner, for its intended purpose
and within the parameters specified in the technical data.
•Do not apply any force to open the instrument.
•Do not operate the instrument if there are signs of damage at the housing,
mains unit or connected cables.
•Always comply with the locally valid safety regulations when carrying out
measurements. Dangers may also arise from objects to be measured or
the measuring environment.
•Do not store the product together with solvents.
•Do not use any desiccants.
•Only perform maintenance and repair work on this instrument that is
described in this documentation. Follow the prescribed steps exactly.
•Use only original spare parts from Testo.
Batteries
•Improper use of batteries may cause the batteries to be destroyed, or lead
to injury due to current surges, fire or escaping chemicals.
•Only use the batteries supplied in accordance with the instructions in the
instruction manual.
•Do not short-circuit the batteries.
•Do not take the batteries apart and do not modify them.

1 Safety and waste disposal
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•Do not expose the batteries to heavy impacts, water, fire or temperatures
in excess of 60 °C.
•Do not store the batteries in the proximity of metal objects.
•Do not use any leaky or damaged batteries.
•In the event of contact with battery acid: rinse affected areas thoroughly
with water, and if necessary consult a doctor.
•Take batteries out of the instrument immediately if they are not functioning
properly or if they show signs of overheating.
•Remove all batteries from the instrument if it is to remain unused for a
longer period.
Warnings
Always pay attention to any information denoted by the following warnings.
Implement the precautionary measures specified!
Display Explanation
WARNING
Indicates possible serious injury.
CAUTION
Indicates possible minor injury.
ATTENTION
Indicates possible damage to equipment.
1.3 Waste disposal
•Dispose of faulty rechargeable batteries and spent batteries in accordance
with the valid legal specifications.
•At the end of its useful life, dispose of the instrument via separate
collection for electro- and electronic devices. Please observe local
regulations concerning waste disposal. Or alternatively return the product
to Testo for disposal.

2 General technical data
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2General technical data
Feature Values
Vacuum measuring range 0 to 26.66 mbar / 0 to 20,000 microns
Sensor overload (relative) 5 bar / 72 psi
Vacuum resolution 1 micron (from 0 to 1,000 microns)
10 microns (from 1,000 to 2,000 microns)
100 microns (from 2,000 to 5,000 microns)
500 microns (from 5,000 to 10,000 microns)
5,000 microns (from 10,000 to 20,000 microns
Vacuum accuracy ±(10% of m.v. +10 microns) (100 to
1,000 microns)
Operating temperature -10 to 50 °C / 14 to 122 °F
Storage temperature -20 to 50 °C / -4 to 122 °F
Temperature measuring
range
-10 to 50 °C / 14 to 122 °F
Temperature resolution 0.1 °C / 0.1 °F
Battery life 50 h (without background illumination and
Bluetooth)
Protection class IP 42
Parameter mmHG, Torr, mbar, hPa, micron, inH2O, inHg.
Pa
Measuring cycle 0.5 sec
Sensor 1× Pirani sensor
Connections - 2× 7/16" UNF
- 1x MiniDIN (t570)
Warranty 2 years
Warranty terms: see website
www.testo.com/warranty
Setting values alarm treshold
Unit Setting range Resolution
mbar / hPa 0 - 7,5 0,05
micron 0 - 7500 50

2 General technical data
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2.1 Bluetooth module
The use of the wireless module is subject to the regulations and
stipulations of the respective country of use, and the module may only
be used in each case in countries for which a country certification has
been granted.
The user and every owner undertake to adhere to these regulations and
prerequisites for use, and acknowledge that the re-sale, export, import,
etc. in particular in, to or from countries without wireless permits, is
their responsibility.
Feature Value
Bluetooth Range 20 m (free field)
(Varies depending on the capability of the
mobile terminal device used.)
Bluetooth type LSD Science & Technology Co., Ltd
L series BLE module (08 May 2013) based on
TI CC254X chip
Qualified Design ID D030430
Bluetooth radio class Class 3
Bluetooth company 10274

3 Description of the instrument
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3Description of the instrument
3.1 Use
The testo 552 is a digital vacuum gauge for the precise measurement of
extremely small pressures in the vacuum range. This allows you to monitor the
evacuation (usually during commissioning) of refrigeration systems and heat
pumps.
With the testo 552, you can therefore measure the current pressure in a
refrigeration system, and thus gather information about the degree of
dehumidification and the removal of foreign matter (oils, foreign gases, etc.).
A vacuum gauge is always used in conjunction with a vacuum pump (generates
the vacuum). A manifold (analogue or digital) is also often used in order to
obtain controlled access to the refrigeration system.
3.2 Instrument overview
Element Function
1 MiniDIN probe socket Cable connection for connecting to the testo
570.
2 Display Displays instrument status icons, measuring
units and measuring values.
3 Control keys Instrument operation.
4 Connections 7/16"
UNF, brass
Connection of refrigerant hoses, vacuum pump,
manifolds, etc..
5 Hook Suspension device
6 Battery compartment Contains two AA batteries.

3 Description of the instrument
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3.3 Displays overview
Element Function
1 Icon [ ] Displays the remaining battery capacity.
>75%
>50%
>25%
<10%
2 Icon [ ] Bluetooth® appears when Bluetooth has been
activated on the instrument.
3 Icon [ ] An alarm threshold is set.
4 Temperature display - selected, currently measured temperature
- Measurement parameter:
TH2O = evaporation temperature of water
Tamb = ambient temperature
Δt = temperature difference between
evaporation temperature of water and ambient
temperature
- unit set (°C, °F)
5 Slave Mode Appears when the testo 552 is connected to the
testo 570 via a connecting cable and the
testo 570 is in Evacuation mode.
6 Pressure display Displays the currently measured pressure, the
measurement parameter and the unit set (mmHG,
Torr, mbar, hPa, micron, inH2O, inHg).

3 Description of the instrument
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3.4 Control keys overview
Element Function
1 - Switches to the settings.
- Switches between the set-up options.
(This function is disabled, when connected to the
App with BT)
2 Switches the display illumination on or off.
3 Switches the instrument on or off.
4 - Switches between the temperature displays.
- Navigates in the Set menu.
5 + Switches Bluetooth® on or off (press and hold down
for 3 sec.)
3.5 Connection options overview
In regard to the following connection options, the testo 570 is used to
represent any manifold and can use the testo 552 as a probe via a
MiniDIN connecting cable (see Option 2).
Option 1 (recommended)
The testo 552 is connected at the point that is furthest from the
vacuum pump. This ensures that a sufficiently deep vacuum is
generated throughout the system in order to remove any moisture or
foreign gases that may be present.

3 Description of the instrument
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Option 2
Option 3
Option 4

3 Description of the instrument
13
Option 5

4 Operation
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4Operation
4.1 Connecting
Always use refrigerant hoses that are specifically intended for
evacuations.
1 - Remove sealing caps.
- Connect the testo 552 to the circuit.
4.2 Switching instrument on and off
1 - Press .

The instrument switches on or off.

The instrument displays oooooo
when ambient pressure is applied to
the connections. The display
indicates the applied pressure value
once the applied pressure is within
the measuring range. (0 to 20,000
microns).

4 Operation
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4.3 Switching background illumination on
and off
1 - Switch the instrument on.
- Press .

The background illumination switches
on or off.
4.4 Setting units and AutoOff
The set-up menu must always be completely navigated through, even
if only one parameter needs to be changed.
1 - Switch the instrument on.
2 - Press to change settings.

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3 - Press to set the pressure unit
required.
4 - Press .

The unit is set.

The display shows the temperature
unit.
5 - Press to set the temperature unit
required.
6 - Press .

The temperature unit is set.

The display shows the setting for the
alarm threshold.
Adjusting the alarm threshold causes an alarm to be triggered when
the set value is exceeded.

4 Operation
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7 - Press to set the alarm threshold.
8 - Press .

The alarm threshold is set.

The display shows the AutoOff
setting.
If AutoOff is activated, the instrument switches off after 15 minutes
when ambient pressure is applied to the sensor.
9 - Press to switch AutoOff on or off.
10 - Press .

All settings are stored.

The display changes to the measuring
mode.

The instrument can now be used.

4 Operation
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4.5 Displaying temperature values
1 - Press to change the temperature
measurement parameter.

The temperature measurement
parameter switches between TH2O,
Tamb and t.
t is displayed in K for °C, and
in °F for °F.
4.6 Establishing a Bluetooth® connection
You need a tablet or smartphone with the Testo Smart Probes App
already installed on it to be able to establish a Bluetooth connection.
You can get the App for iOS instruments in the App Store or for
Android instruments in the Play Store.
Compatibility:
Requires iOS 8.3 or later / Android 4.3 or later
Requires Bluetooth 4.0
1 - Press and simultaneously and hold down for 3 seconds.

- When the Bluetooth icon is shown on the display, Bluetooth is
switched on.
- Once the APP is opened, the instrument will be connected
automatically if it is within range. The instrument does not have to
be connected to the smartphone / tablet beforehand via settings.
2 - Press and simultaneously and hold down for 3 seconds.

- When the Bluetooth icon is no longer shown on the display,
Bluetooth is switched off.

4 Operation
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Display Explanation
flashes There is no Bluetooth® connection, or a
potential connection is being searched for.
is permanently displayed There is a Bluetooth® connection
is not displayed Bluetooth® is disabled.
4.7 Overview of operating controls
1. Choice of applications.
2. Display of connected testo 552.
3. Switch between the views (list, graphic diagram, table).
4. Restarts the measuring value recording in graph and table format.
5. Export the readings.
6. Options menu.
4.8 App options
4.8.1 Set “Language”
1 - Tap -> Settings -> Language

A selection list is displayed.
2 - Tap the required language.

The selected language receives a green check mark.

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3 - Tap several times until the measurement view is displayed.

The language has been changed.
4.8.2 Display Tutorial
The Tutorial guides you through the first steps when operating the testo
Smart Probes App.
1 - Tap -> Tutorial

The Tutorial is displayed. In Tutorial, swipe to display the next page.
2 - Tap X to close the Tutorial.
4.8.3 Display testo website
An internet connection is required to display the testo website.
1 - Tap -> About/Link -> Testo

The page www.testo-international.com is displayed.
4.8.4 Display App Info
In App Info you can find the version number of the installed App.
1 - Tap -> About/Link -> Info

The App’s version number is displayed, as well as the ID.
2 - Tap several times until the measurement view is displayed.