TESTO 6721 User manual

Instruction manual en
testo 6721 Dew point monitor
P2A software for testo 6721

2

3
Contents
Contents 3
Safety and the environment 4
Part 1: testo 6721
Specifications 5
Commissioning 8
Assembling the instrument 8
Wiring the instrument 9
Connecting the instrument 11
Parameterizing/adjusting/analyzing the instrument 11
Maintaining the product 11
Tips and assistance 12
Part 2: testo P2A Software
Specifications 13
First steps 14
Installing the software/driver 14
Starting the software 14
Product description 15
Using the product 16
Tips and assistance 19
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Contents 3
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4Safety and the environment
Safety and the environment
About this document
Please read this documentation through carefully and familiarize yourself with
the product before putting it to use. Keep this documentation to hand so
that you can refer to it when necessary. Hand this documentation on to any
subsequent users of the product.
Pay particular attention to information emphasized by the following symbols:
· Important.
Avoiding personal injury/damage to equipment
Never store the product together with solvents and do not use any
desiccants.
Only operate the product properly, for its intended purpose and within the
parameters specified in the technical data. Do not use force.
Only carry out the maintenance and repair work that is described in the
documentation. Follow the prescribed steps when doing so. Use only OEM
spare parts from Testo.
Protecting the environment
Send the product back to Testo at the end of its useful life. We will ensure
that it is disposed of in an environmentally friendly manner.

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testo 6721 - Specifications
PART 1: TESTO 6721
Specifications
Functions and use
The 6721 is a dew point monitor for monitoring trace humidity in the following
applications:
· Trace humidity monitoring in compressed air systems, e.g. upstream of pneumatic
machines.
· Monitoring (compressed air) low-temperature driers.
· Monitoring (compressed air) membrane driers.
The product must only be assembled, wired and connected by qualified
personnel.
The product must not be used in areas at risk of explosion!
Ordering overview
0555 6721 Axx / Fxx / Kxx
A01 G½" process connection
A02 NPT ½" process connection
B01 Measuring range -30 to +30°Ctd
B02 Measuring range -45 to +30°Ctd
F01 Dew point °Ctd / GW 1 / GW 2 / hysteresis
F02 Dew point °Ftd / GW 1 / GW 2 / hysteresis

6testo 6721 - Specifications
Technical details
Dimensions:
➊0555 6721-A01: G½
0555 6721-A02: NPT½"
➋Installation depth in process
➌Wrench size
33
176
167
33
21ø
7
2
56 ➋
92
42
➊
➌
Parameters, measuring range
· Dew point temperature (trace humidity):
-30 to 30 °Ctd/-22 to 86 °Ftd (B01) | -45 to +30°Ctd/
-49 to +86°Ftd (B02)
Accuracy
· Dew point temperature at 25 °C/77 °F process
temperature:
±4 K (-30…-20°Ctd/-22…-4°Ftd),
±3 K (-20…-10°Ctd/-4…14°Ftd),
±2 K (-10…0°Ctd/14…32°Ftd),
±1 K (>0°Ctd/>32°Ftd)
Resolution
· 0.1 °Ctd/0.1 °Ftd
Meas. cycle
·1/s
Other instrument data
· Humidity sensor: Testo humidity sensor (with special
trace humidity adjustment)
· Temperature sensor: NTC
· Output variable: Dew point (°Ctd or °Ftd) via two
switching outputs
· Measuring medium: Compressed air (filtered and
dried, ISO 8573 classes 2-4-2)
· Operating temperature: 0 - 50 °C/32 -122 °F, ideally
between 10 °C and 35 °C/50 °F
· Pressure range: max. 50 bar (abs)
· Connection: G½" (0555 6721-A01) or NPT½"
(0555 6721-A02)
· Supply: 24 V AC/V DC (20 - 30 V AC/V DC permissible)
· Power consumption: 50 mA
· Interfaces: mini-DIN interface for
parameterizing/adjusting/analyzing using testo
P2A Software
· Switching outputs: 2 x floating, switching voltage
24 V DC/V AC, switching current 0.5 A, optional wiring
as NC or NO contact
· Limit values (2x) and switching hysteresis (1x):
Free choice within the measuring range by means of
order code, or setting via testo P2A Software
· Sensor protection: Sintered stainless steel filter,
12 mm diameter
· Housing material: plastic PAA GF30
· Housing dimensions: 167 x 33 x 33 mm
· Protection class: IP65 (with adapter connected or with
protective tab on closed interface.)
· Ambient temperature: 0 to 50 °C/32 to 122 °F
· Storage temperature: -40 to 70 °C/-40 to158 °F
· Weight: 240 g
Directives, standards and tests
· EC Directive: 2014/30/EC
Warranty
· Duration: 2 years
· Warranty conditions: see website
www.testo.com/warranty

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testo 6721 - Product description
Product description
At a glance
➊Sensor protection: Sintered stainless steel cap.
➋Fixing the sensor assembly: Threaded pin.
➌Screwed socket: G ½ (0555 6721-A01) or NPT ½" (0555 6721-A02).
➍Fixing the housing cover: 2 countersunk screws.
➎Connector socket for switching contact connector.
➏Connector socket for external interface (mini-DIN Testo), plug.
Factory settings
Characteristic 0555 6721-F01 0555 6721-F02
Unit °Ctd °Ftd
Limit value for switching output 1 5 45
Limit value for switching output 2 10 55
Hysteresis 1 2

8testo 6721 - Commissioning
Commissioning
Assembling the instrument
➣Assembling the instrument at the process connection:
✓If assembling without a measurement chamber: The sections of pipe
where the instrument is assembled are depressurized.
1To ensure leaktightness: Wrap the thread of the screwed socket using
sealing tape (e. g. PTFE) or insert a copper sealing ring (internal diameter
of 21 mm).
2Assemble the instrument according to the application in hand:
Applications/assembly options
AProcess temperatures < 15 °C or > 35 °C (max. 200 °C):
Assembly with measurement chamber and cooling coil.
BProcess temperatures of 15 - 35 °C, quick assembly/dismantling of instrument is required, sufficient
incident flow through sensor (1l/min) not present:
Assembly with measurement chamber.
If media are contaminated: use suitable pre-filter.
CProcess temperatures of 15 - 35 °C, installation of sensor directly in the process is possible, quick
assembly/dismantling of instrument is not required, sufficient incident flow through sensor (1l/min)
present, compressed air is not contaminated:
Assembly without measurement chamber and without cooling coil
C
C
B
A
A
0555 6721-A01
0555 6721-A02
G 1/2
NPT 1/2"
G 1/2
NPT 1/2"
➊➋
➏
➎➍
➌

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testo 6721 - Commissioning
➊Process connection, quick-release compressed-air fastener NW 7.2 or G 1/2" or
NPT 1/2" thread
➋Cooling coil
➌Preliminary filter
When using the preliminary filter, it must be ensured that there is
sufficient flow (1 l/min) in the measurement chamber by cleaning the
filter regularly.
➍Measurement chamber (0554 3303).
➎testo 6721 dew point monitor.
➏Assembling the measurement chamber on the dew point monitor.
Only apply force at the hexagon (AF 27)!
Wiring the instrument
The testo 6721 is supplied with the right connector to which a cable can be
soldered by the customer. Alternatively, the 5 m accessories cable with the
pre-fabricated connector (0554 6720) can be used.
➣Fabrication of connection cable by the customer:
Testo recommends an 8-wire line with a tightly plaited shield, wire cross-
section of 0.25 - 0.5 mm².
1Remove top part of connector ➊from bottom
part of connector ➋(screw cap).
2Open line fixture on top part of connector
(screw cap/union nut ➌) and feed through
lines of connecting cable.

10 testo 6721 - Commissioning
3Solder ends of lines to the pins in the bottom
part of the connector ➍:
Two separate switching points can be created
using the two switching contacts which can
each be configured as either a NC contact
(1-3, 9-5) or NO contact (1-2, 9-6) ➎.
Assignment of the pins
1Root/pin for switching contact 1
2NO contact for switching contact 1
3NC contact for switching contact 1
4Supply -
5NC contact for switching contact 2
6NO contact for switching contact 2
7Functional earth
8Supply +
9Root/pin for switching contact 2
4Fasten top part of connector to bottom part
of connector (screw cap) and close line fixture
(screw cap/union nut).
➣Feeding wiring through with accessories cable 0554 6720:
Shorten length of line (5 m) if necessary.
Connect the ends of the line according to the colour assignment:
Two separate switching points can be created using the two switching
contacts which can each be configured as either a NC contact (grey-pink,
brown-green) or NO contact (grey-yellow, brown-white).
Colour Assignment
grey root/pin for switching contact 1
yellow NO contact for switching contact 1
pink NC contact for switching contact 1
red supply +
green NC contact for switching contact 2
white NO contact for switching contact 2
black Functional earth
blue supply -
brown root/pin for switching contact 2

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testo 6721 - Commissioning
Connecting the instrument
➣Connecting the switching contact connector to the instrument:
Fasten switching contact connector to the port of the instrument
(connector with rotary protection).
Parameterizing/adjusting/analyzing the
instrument
The instrument is parameterized, adjusted and analyzed using the P2A
Software, see “Part 2: testo P2A Software”.
Maintaining the product
➢Cleaning the housing:
Clean the housing with a damp cloth (soap suds) if it is dirty. Do not use
aggressive cleaning agents or solvents!
➢Cleaning the sensor protection cap, measurement chamber, cooling coil and
preliminary filter:
If used in process conditions involving oil or dust, the sintered stainless steel
filter and, if used, the measurement chamber, preliminary filter and cooling
coil must be cleaned regularly.
Remove the measurement chamber and cooling coil/unscrew sensor
protection cap/unscrew preliminary filter and blow out with compressed
air or place in an ultrasonic bath.
➢Cleaning the sensor:
During cleaning, avoid touching the sensor at all costs.
Do not clean the sensor mechanically, as this can damage the cover
electrode.
Screw off filter cover.
Carefully rinse the mirrored surface with isopropyl alcohol and/or distilled
water.
Allow the sensor to dry completely.

12 testo 6721 - Tips and assistance
Tips and assistance
Questions and answers
Question Possible causes/solutions
Faulty switch signal - Test limit values and hysteresis using P2A Software
- View adjustment history using P2A Software: Faulty adjustment?
If we could not answer your question, please contact your dealer or Testo
Customer Service. For contact details see the rear side of this document or the
web page www.testo.com/service-contact
Accessories and spare parts
Designation Article no.
Parameterizing, adjusting and analyzing software (P2A Software incl. adapter cable for USB to mini-DIN) 0554 6020
Measurement chamber for optimum incident flow through humidity sensor, max. 15 bar, for G½" thread 0554 3303
Sintered stainless steel filter 0554 0647
Connector with 5 m cable 0554 6720
Mains unit (bench unit), 90 - 264 V AC/24 V DC (350mA) 0554 1748
Mains unit (top-hat rail mounting), 90 - 264 V AC/24 V DC (2.5A) 0554 1749
For a complete list of all accessories and spare parts, please refer to the
product catalogues and brochures or look up our website at: www.testo.com

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testo P2A Software - Specifications
PART 2: TESTO P2A SOFTWARE
Specifications
Functions and use
The P2A software is used for the parameterizing, adjustment and analysis of
testo transmitters. The following applies:
• If a Testo transmitter is bought at a later stage (and is therefore more recent than the existing P2A software
version), a software update is required.
• You can find the free upgrade on the Testo website www.testo.com under the product-specific downloads.
• The software therefore only needs to be bought once, even for owners of several Testo transmitters.
Systemvoraussetzungen
Betriebssystem
· Windows®XP Home/Professional SP3
· Windows®Vista
· Windows®7
· Windows®8
· Windows®10
Rechner
The computer must fulfil the requirements of the respective operating system. The
following requirements must additionally be fulfilled:
· Graphic resolution min. 1024 x 768
· Interface USB 1.1 or higher
Date and time settings are automatically taken over from the computer. The
administrator must ensure that the system time is regularly synchronized with
a reliable time source, in order to guarantee the authenticity of the data.

14 testo P2A Software - First steps
First steps
Installing the software/driver
Adminstrator rights are required for installation.
➢Installing the P2A Software:
Installing P2A software:
1. Insert CD with the P2A software.
If the installation program does not start automatically:
> Open Windows Explorer and start the setup.exe file on the software CD.
2. Follow the instructions of the installation wizard.
➢Installing the USB drivers:
The USB driver CD is supplied with the P2A Software
Before installing the USB drivers, please read the separate documentation
enclosed with the USB driver CD.
The installation of the USB driver is the prerequisite for the faultless use of
the P2A software.
➢P2A Software update:
1. You can find the P2A software upgrade on the Testo website
www.testo.com under the product-specific downloads. Download and
save P2A software upgrade.
2. Start P2A upgrade.exe file.
3. Follow the instructions of the installation wizard.
Starting the software
➢Starting the program:
Windows program menu
Windows 2000®SP4, Windows®XP or Windows®Vista
> Click on [Start] > All Programs > Testo > P2A Software (double-click on
left mouse button).
Windows® 7
> Click on [Start] > All Programs > Testo > P2A Software (double-click on
left mouse button).

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testo P2A Software - Product description
Windows® 8
> Click on [Start] | right mouse button | Search | Enter the name of the
application in the search field | P2A Software. (double-click on left mouse
button).
Windows® 10
> Click on [Start] | All Apps | Testo | P2A Software. (double-click on left
mouse button).
Product description
User interface
➊Menu bar.
➋Toolbar.
➌File list: List of all instrument/parameter files.
File symbols
· : Instrument file, connection to the unit has not been established.
· : Instrument file, connection to the unit has been established.
· : Parameter file.
File identifications
· Instrument files: “[Type] [serial number].cfm”; file identifications cannot be changed.
Instrument files contain all the data relating to a particular instrument. These are the parameter data and
represent the parameterization and adjustment history of the instrument.

16 testo P2A Software - Using the product
· Parameter files: “[Type] [serial number] [date] [time].cfp”; file identifications can be changed.
Parameter files only contain parameter data. These can be copied to another instrument or parameter file for
the same type of instrument so that several instruments have the same parameter settings.
➍List of functions.
➎File information:
Information displayed
· Instrument files: Type, serial number, firmware version and connection status of the instrument.
· Parameter file: Type, serial number and firmware version of instrument with which the parameter file was
created.
· Connection status (instrument files only): “red” connection is active, “green” connection is inactive.
Using the product
➢Establishing a connection with the device:
Several instruments can be connected to the PC and administered via the
P2A software, but only one connection can ever be active at any one time.
Non-wired instruments can also be connected to the P2A Software for
parameterization/adjustment. The supply to the instruments is then effected
via the USB interface.
1Connect the USB/mini-DIN adapter to the external interface (mini-DIN) of
the instrument.
2Connect the USB connector of the adapter to the PC.
- The instrument file for the instrument connected appears in the
instrument file/parameter file list.
➢Selecting the instrument/parameter file, activating a connection with the
device:
Click on the requisite instrument/parameter file.
- The selected file is highlighted in colour.
- For instrument files only: if a connection with the instrument has been
established, this is automatically activated.
➢Changing an instrument/parameter file:
✓The required instrument/parameter file is selected.
1Click on Change parameterization button.
2Enter parameters in the corresponding fields.
3Click on Apply to confirm entries.
4To leave the parameterization screen, click on OK.

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testo P2A Software - Using the product
➢Saving the parameters in a parameter file:
The parameter data for the selected instrument/parameter file can be saved.
Only parameter data stored in the standard file can be loaded into an
instrument!
✓The required instrument/parameter file is selected.
1In the menu bar, click on File > Save as.
2Select the storage location and enter the file name.
3Click on Save to confirm entries.
➢Opening a parameter file:
All parameter files stored in the standard directory path are automatically
displayed in the file list when the software is started. Parameter files stored in
other directories can also be opened.
Only parameter data stored in the standard file can be loaded into an
instrument!
1In the menu bar, click on File > Open.
2Select the storage location and click on the requisite parameter file.
3Click on Open to confirm entries.
➢Copying the parameter data:
The parameter data for an instrument/parameter file can be transferred to
another instrument/parameter file for the same type of instrument. History
data for instrument files are not transferred.
1Select file from which the parameter data are to be copied.
2In the menu bar, click on Edit > Copy.
3Select the file which is to be modified.
4In the menu bar, click on Edit > Paste.
➢Analyzing/testing the instrument:
✓The required instrument file is selected.
1Click on Test/analyze transmitter button.
2Perform tasks:
Options
· Carry out factory reset: Reset the parameter unit, scaling limits and adjustment to the factory settings
(values device-specific, see type label).
· Transmitter tests: Manually switch switching outputs to test functionality.
· Min./max. values: Change to display of minimum/maximum values.

18 testo P2A Software - Using the product
3Click on Apply to confirm entries.
4To leave the analyzing/test screen, click on OK.
➢Carrying out a 1-point adjustment:
A 1-point adjustment (offset) can be performed. A dew point mirror is
recommended as a reference measuring instrument for dew point
temperatures < 0 °Ctd.
1Click on Adjust transmitter button.
2Expose the reference measuring instrument and the instrument to be
adjusted to the same constant conditions and wait for equalization period
to lapse.
3Enter reference value and perform adjustment by clicking on Carry out 1-
point adjustment.
To reset an offset value, click on Set Offset to zero.
4Click on Apply to confirm entries.
➢Viewing a transmitter history:
The current history data as stored in the instrument file are always displayed.
A distinction is made between parameterization and adjustment histories.
Dates and times refer to the PC time when the P2A Software was being
used.
History data are only stored in the instrument file (PC), not in the testo
6721.
1Click on Transmitter history button.
2To move between the views, click on Parameterization history or Adjustment
history.
To print the history data, click on Print.
➢Deleting parameters from an instrument/parameter file:
The parameter data for the selected instrument/parameter file can be
deleted.
✓The required instrument/parameter file is selected.
1Right-click on the instrument/parameter file.
2Select Delete.
3Click on Yes to confirm.

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testo P2A Software - Tips and assistance
➢Creating a new folder:
✓The folder to which the new folder is to be added is selected.
1In the menu bar, click on File > Add Folder.
2Give the new folder a name.
Tips and assistance
Questions and answers
Question Possible causes/solutions
Connection to instrument cannot
be established. · Check connecting cable and plug contacts.
· USB driver not/incorrectly installed: Re-install.
Adjustment is to be reversed. · Carry out factory reset: Click on Test/analyze transmitter > click
on Carry out factory reset.
If we could not answer your question, please contact your dealer or Testo
Customer Service. Contact details can be found on the guarantee card or on
the Internet at: www.testo.com

testo SE & Co. KGaA
Postfach 11 40, 79849 Lenzkirch
Testo-Straße 1, 79853 Lenzkirch
Telephone: [phone]
Fax: [phone]
E-mail: [email protected]
Internet: http://www.testo.com
0970 6720 en 05
www.testo.com