TESTO 6351 User manual

testo 6351 · differential pressure transmitter
P2A software · Parameterizing, adjusting and analyzing
software
Instruction manual

2

1 Safety and the environment
3
1 Safety and the environment
Avoiding electrical hazards
> Never use the instrument and connected probes to measure on
or near live parts!
> Damaged mains cables must only be replaced by authorized
personnel.
> Only have the transmitter wired and connected by authorized
personnel with the voltage disconnected.
> You must always comply with the regulations applicable in your
country for opening and repairing electrical equipment.
Avoiding personal injury and damage to equipment
> Installation, setting and calibration work must only be carried
out by qualified and authorized personnel!
> Only open the instrument when this is expressly described in
the instruction manual for installation, maintenance or repair
purposes.
> Observe the permissible storage, transport and operating
temperature.
> Do not store the product together with solvents. Do not use any
desiccants.
> Do not use the instrument for control purposes at the same time
as operating or servicing the transmitter.
> Only operate the product properly, for its intended purpose and
within the parameters specified in the technical data. Do not
use any force.
> Carry out only the maintenance and repair work on this
instrument that is described in the documentation. Follow the
prescribed steps exactly. Use only original spare parts from
Testo.
Any additional work must only be carried out by authorized
personnel. Otherwise testo will not accept any responsibility for the
proper functioning of the instrument after repair and for the validity
of certifications.
Protecting the environment
> At the end of its useful life, send the product to the separate
collection for electric and electronic devices (observe local
regulations) or return the product to Testo for disposal.

2 About this document
4
2 About this document
Use
> Please read this documentation through carefully and
familiarize yourself with the product before putting it to use. Pay
particular attention to the safety instructions and warning advice
in order to prevent injuries and damage to the products.
> Keep this document to hand so that you can refer to it when
necessary.
> Hand this documentation on to any subsequent users of the
product.
WARNING Indicates potential serious injuries
CAUTION indicates potential minor injuries
Symbols and writing standards
Representa-
tion
Explanation
Note: Basic or further information.
1....
2....
Action: more steps, the sequence must be
followed.
> ... Action: a step or an optional step.
- ... Result of an action.
Menu Elements of the program interface.
[OK] Buttons of the program interface.
... | ... Functions/paths within a menu.
“...” Example entries

3 Contents
5
3 Contents
1 Safety and the environment ..................................................... 3
2 About this document ................................................................ 4
3 Contents .................................................................................. 5
4 Transmitter .............................................................................. 8
4.1. Specifications ........................................................................ 8
4.1.1. Functions and use ........................................................................................................ 8
4.1.2. Scope of delivery ......................................................................................................... 8
4.1.3. Accessories .................................................................................................................. 8
4.1.4. Technical data.............................................................................................................. 9
4.1.5. Dimensions ................................................................................................................ 12
4.2. Product description ............................................................. 13
4.2.1. At a glance ................................................................................................................. 13
4.2.2. Display and keypad .................................................................................................... 15
4.2.3. Service interface ........................................................................................................ 15
4.2.4. Relay board (option) .................................................................................................. 15
4.2.5. Analog outputs .......................................................................................................... 15
4.2.6. Parameters ................................................................................................................ 16
4.2.7. Scaling ....................................................................................................................... 16
4.2.8. Alarm handling .......................................................................................................... 18
4.3. Commissioning .................................................................... 18
4.3.1. Assembling the instrument ........................................................................................ 18
4.3.1.1. Wall mounting ........................................................................................... 18
4.3.2. Connecting the instrument ........................................................................................ 19
4.3.2.1. Overview of terminals ................................................................................ 21
4.3.2.2. Connecting voltage supply and analog outputs .......................................... 22
4.3.2.3. Connecting the relay outputs ..................................................................... 23
4.3.2.4. Plug-in connection option .......................................................................... 26
4.3.2.5. Closing the instrument ............................................................................... 27
4.3.3. Adjusting the instrument ........................................................................................... 28
4.3.3.1. Analog output adjustment ......................................................................... 28
4.3.3.2. n-point adjustment .................................................................................... 29
4.4. Operation ............................................................................ 30
4.4.1. Relationship between user menu and mini-DIN socket is active ................................ 30
4.4.2. Key cover ................................................................................................................... 31
4.4.3. Password protection .................................................................................................. 31
4.4.4. Structure of user menu .............................................................................................. 32

3 Contents
6
4.4.5. Overview of the testo 6351 user menu ...................................................................... 33
4.4.6. The individual main menus ........................................................................................ 36
4.4.6.1. Editing main menu of channel 1 ................................................................. 36
4.4.6.2. Editing Main Menu Alarm .......................................................................... 36
4.4.6.3. Editing Main Menu Settings ....................................................................... 39
4.4.6.4. Editing Main Menu Analysis ....................................................................... 41
4.4.6.5. Editing Message main menu ...................................................................... 43
4.4.6.6. Calling up Main Menu Ident ....................................................................... 44
4.4.6.7. Editing Main Menu Adjust .......................................................................... 44
4.4.6.8. Editing Reset main menu ........................................................................... 46
4.5. Status, warning and error messages ................................... 46
4.5.1. Status messages ......................................................................................................... 47
4.5.2. Warning messages ..................................................................................................... 48
4.5.3. Transmitter error messages ....................................................................................... 49
4.5.4. Handling alarm messages .......................................................................................... 49
4.5.5. Namur fault conditions .............................................................................................. 50
4.6. Maintenance and cleaning .................................................. 51
4.6.1. Maintaining the instrument ....................................................................................... 51
4.6.2. Cleaning the instrument ............................................................................................ 51
5 Parameterizing, adjusting and analyzing software (P2A
software) .............................................................................. 52
5.1. Specifications ...................................................................... 52
5.1.1. Functions and use ...................................................................................................... 52
5.1.2. System requirements ................................................................................................. 53
5.1.3. Scope of delivery........................................................................................................ 53
5.2. First steps ............................................................................ 54
5.2.1. Installing the software/driver .................................................................................... 54
5.2.1.1. Installing P2A software............................................................................... 54
5.2.1.2. Installing USB driver ................................................................................... 54
5.2.1.3. P2A software upgrade ................................................................................ 54
5.2.2. Starting the software ................................................................................................. 54
5.2.2.1. Starting the program .................................................................................. 54
5.2.2.2. Establishing a connection with the instrument .......................................... 55
5.2.2.3. Activating the connection with the instrument .......................................... 55
5.3. Using the software .............................................................. 56
5.3.1. User interface ............................................................................................................ 56
5.3.2. Editing instrument/parameter file ............................................................................. 58
5.3.2.1. Changing instrument/parameter file .......................................................... 58
5.3.2.2. Saving parameters ..................................................................................... 66
5.3.2.3. Opening the parameter file ........................................................................ 67

3 Contents
7
5.3.2.4. Copying and pasting parameters................................................................ 67
5.3.2.5. Deleting instrument/parameter file ........................................................... 67
5.3.2.6. Creating a new instrument file ................................................................... 68
5.3.3. Analyzing/testing the transmitter .............................................................................. 68
5.3.3.1. Analyzing/testing the instrument ............................................................... 68
5.3.3.2. Carrying out factory reset .......................................................................... 68
5.3.3.3. Testing analog output ................................................................................ 69
5.3.3.4. Testing switch output relays 1 to 4 ............................................................ 71
5.3.3.5. Displaying min./max. values....................................................................... 72
5.3.4. Adjusting the transmitter .......................................................................................... 73
5.3.4.1. n-point adjustment .................................................................................... 73
5.3.4.2. Adjusting the analog output ...................................................................... 74
5.3.5. Transmitter history .................................................................................................... 75
6 Tips and assistance ................................................................. 80
6.1. Questions and answers ....................................................... 80
6.2. Accessories and spare parts ................................................ 80
6.2.1. Ordering options for testo 6351 transmitter (0555 6351).......................................... 81

4 Transmitter
8
4 Transmitter
4.1. Specifications
4.1.1. Functions and use
The testo 6351 transmitter is suitable for the following applications,
amongst others:
• Test benches
• Clean rooms
• Filling processes
• Complex room climate applications
• Monitoring flow velocities or volumetric flow rates in air
conditioning systems
4.1.2. Scope of delivery
The scope of delivery of the testo 6351 transmitter includes the
following:
• Key cover
• Rear panel bracket
• Instruction manual
• Calibration report
4.1.3. Accessories
The following accessories are available for the testo 6351
transmitter, amongst others:
• Mains unit
• P2A software (parameterizing, adjusting and analyzing
software)
• Assembly accessories
Information about accessories and their order numbers can
be found in 6.2. Accessories and spare parts or on the
website at www.testo.com.

4 Transmitter
9
4.1.4. Technical data
Parameter
• Differential pressure
Accuracy
The specifications are only valid if the positive pressure is
applied at the positive pressure connection.
• ±0.8 % of measuring range final value, additional ±0.3 Pa
intrinsic error1
• TK slope drift = 0.03 % of measuring range per degree Kelvin of
deviation from nominal temperature 22 °C
• TK zeroing drift= 0 %, as zeroing with solenoid valve2
Measuring range, resolution and overload
Measuring range
depending on
resolution ordered
Resolution Overload
0 to 50 Pa 0.1 Pa 20,000 Pa
0 to 100 Pa 0.1 Pa 20,000 Pa
0 to 500 Pa 0.1 Pa 20,000 Pa
0 to 10 hPa 0.01 hPa 200 hPa
0 to 50 hPa 0.01 hPa 750 hPa
0 to 100 hPa 0.1 hPa 750 hPa
0 to 500 hPa 0.1 hPa 2500 hPa
0 to 1000 hPa 1 hPa 2500 hPa
0 to 2000 hPa 1 hPa 2500 hPa
1 Measuring uncertainty in accordance with GUM: ±0.8 % of measuring range final value ±0.3 Pa.
The determination of measurement uncertainty takes place according to GUM (Guide to the Expression of
Uncertainty in Measurement): For the determination of measurement uncertainty, the accuracy of the
measuring instrument (hysteresis, linearity, reproduceability), the uncertainty contribution of the test site as
well as the uncertainty of the adjustment site (works calibration are taken into account. For this purpose, the
value of k=2 of the extension factor, which is usual in measurement technology is used as a basis, which
corresponds to a trust level of 95%.
2 Minor mixtures of the media may occur at the positive and negative pressure side due to the automatic
zeroing cycle.

4 Transmitter
10
Measuring range
depending on
resolution ordered
Resolution Overload
-50 to 50 Pa 0.1 Pa 20,000 Pa
-100 to 100 Pa 0.1 Pa 20,000 Pa
-500 to 500 Pa 0.1 Pa 20,000 Pa
-10 to 10 hPa 0.01 hPa 200 hPa
-50 to 50 hPa 0.01 hPa 750 hPa
-100 to 100 hPa 0.1 hPa 750 hPa
-500 to 500 hPa 0.1 hPa 2500 hPa
-1000 to 1000 hPa 1 hPa 2500 hPa
-2000 to 2000 hPa 1 hPa 2500 hPa
Upon delivery and
following a factory reset the readings are
shown in the display in the unit that was ordered via the
KMAT option Fxx, see 6.2.1. Ordering options for testo
6351 transmitter (0555 6351).
Meas. cycle
• 1/sec
Interface
• Mini-DIN for P2A software (adjustment and parameterization
software)
• optional: Ethernet module
Voltage supply
• 4-wire (separate signal and supply lines): 20 to 30 V AC/DC,
300 mA power consumption
Maximum load
• 4-wire: 500 Ω (power output)

4 Transmitter
11
Maximal load
• 4-wire: 10 kΩ (voltage output)
Analog output
• 0 to 1 V ± 1.5 mV (4-wire) or
• 0 to 5 V ± 7.5 mV (4-wire) or
• 0 to 10 V ± 15 mV (4-wire) or
• 0 to 20 mA ± 0.03 mA (4-wire) or
• 4 to 20 mA ± 0.03 mA (4-wire)
• TK = 0.05 %K of measuring range per degree Kelvin of
deviation from nominal temperature 22 °C
Resolution of analog output
• 12 bit
Relay
• 4 relays, 250 V AC/DC, 3 A (optional)
Display
• 2-line LCD with plain text line (optional)
Operating temperature
• -5 to 50 °C/23 to 122 °F
Storage temperature
• -20 to 60 °C/-4 to 140 °F

4 Transmitter
12
Process temperature
• -20 to 65 °C/-4 to 149 °F
Housing, weight
• Plastic, 0.7 kg
• Optional Ethernet intermediate layer: 0.6 kg
Protection class
• IP 65 only if the transmitter is wired and/or sealing plugs are
inserted
Directives, standards and tests
• EC Directive: 2014/30/EU
4.1.5. Dimensions
Dimensions in mm a b
with M20 cable couplings 144 147
With NPT cable coupling 144 144
With M plug-in connection 143

4 Transmitter
13
4.2. Product description
4.2.1. At a glance
1Keys (only with optional
display)
2Service flap screw
connection (self-locking,
2 pcs.)
3Display (optional)
4Service flap
5Negative pressure
connection
6
Positive pressure connection,
marked with a red washer
7Lower part of housing
8M 16 x 1.5 screw
connection*, e.g. analog
outputs
9M 16 x 1.5 screw
connection*, e.g. voltage
supply
10Eyelet for measuring point
panel
11M 20 x 1.5 screw
connection*, e.g. R3 and R4
relays
12M 20 x 1.5 screw
connection*, e.g. R1 and R2
relays
13Adjusted probe plug (non-
functional probe socket)
14Upper part of housing
*Alternatively, NPT cable
couplings or M plug-in
connections are available

4 Transmitter
14
15Housing screws
16Hole for fastening to rear
panel bracket (M3 x 6 screw)
17Plastic bracket for assembly
on rear panel

4 Transmitter
15
4.2.2. Display and keypad
The display option allows operation of the testo 6351 transmitter via
the display and four keys.
The LCD display consists of two 7-segment lines for displaying
readings and units and of an information line (for status messages,
for example).
The brightness and contrast of the display and the background
lighting (permanent or off) can be changed via the user menu or the
P2A software.
4.2.3. Service interface
The parameterizing socket (mini-DIN) is located behind the service
flap as an interface to the P2A software.
4.2.4. Relay board (option)
This has a floating switch capacity of 250 V AC/3 A. The switching
limits and hysteresis as well as the function as relay for the
collective alarm can be set via the display or the P2A software.
Further features include:
• Function of changeover contacts (NC/NO contacts) freely
selectable
• 12 terminals for a total of 4 relays.
If no relays are available, setti
ngs for monitoring limit values
or alarms can still be controlled via the display. The alarm
status will be shown on the display.
Only have the transmitter wired and connected by
authorized personnel with the voltage disconnected.
4.2.5. Analog outputs
As analog outputs, the testo 6351 has either
• 1 current output of 0 to 20 mA (4-wire)/4 to 20 mA (4-wire) or
• 1 voltage output of 0 to 1 V/0 to 5 V/0 to 10 V (4-wire)

4 Transmitter
16
4.2.6. Parameters
The following parameters are displayed:
• Differential pressure in Pa, hPa, kPa, mbar, bar, mmH2O, inch
H2O, inch HG, kg/cm2, PSI
• Flow3 in m/s, ft/min
• Volumetric flow rate4 in m3/h, l/min, Nm3/h, Nl/min
• Mixture humidity H2O2 in %RHm.
•
4.2.7. Scaling
There are three types of min./max. values:
1The measuring range: The maximum sensor performance is in
this range. Values outside of the measuring range are displayed
via messages, for example. Measuring range, see table
(below).
2Standard scaling: The output signals are assigned to this
measuring range as standard:
◦ during delivery if no entries are made in the order code
◦ after exchanging the unit, the measuring range recorded in
the instrument is applied as standard.
The transmitter even retains its scaling with the voltage
disconnected.
Measuring range, see table (below).
3The maximum settings for the manual scaling
◦ The maximum limits can be calculated as follows:
X = difference between MIN. and MAX. value of the
standard scaling
(Max. value of standard) + (50 % of X)
(Min. value of standard) - (50 % of X)
◦ It is thus possible to scale beyond the measuring range, e.g.
for the adjustment of the scaling limits to standard values of
a PLC.
With the alarm definition, however, the physical measuring
range limits are decisive.
3 To prevent fluctuating flow rate values at the zero point (depressurized), the flow rate values are only
calculated as of differential pressures > 0.2 Pa or > 0.1 % of the respective measuring range (whichever is the
greater). With smaller differential pressures, the flow rate value remains at 0.00 m/s.
4 Calculated

4 Transmitter
17
Measuring
range/standard scaling
Maximum scaling
0 to 50 Pa -25 to 75 Pa
0 to 100 Pa -50 to 150 Pa
0 to 500 Pa -250 to 750 Pa
0 to 10 hPa -5 to 15 hPa
0 to 50 hPa -25 to 75 hPa
0 to 100 hPa -50 to 150 hPa
0 to 500 hPa -250 to 750 hPa
0 to 1000 hPa -500 to 1500 hPa
0 to 2000 hPa -1000 to 3000 hPa
-50 to 50 Pa -100 to 100 Pa
-100 to 100 Pa -200 to 200 Pa
-500 to 500 Pa -1000…1000
-10 to 10 hPa -20 to 20 hPa
-50 to 50 hPa -100 to 100 hPa
-100 to 100 hPa -200 to 200 hPa
-500 to 500 hPa -1000 to 1000 hPa
-1000 to 1000 hPa -2000 to 2000 hPa
-2000 to 2000 hPa -4000 to 4000 hPa

4 Transmitter
18
4.2.8. Alarm handling
For upper and lower alarm limits, individual alarms as well as
collective alarms can be specified. If the collective alarm function is
activated, an alarm is triggered as soon as the alarm limit of an
alarm is exceeded, if this alarm is assigned to the collective alarm.
The testo 6351 monitors limit values with the help of relays. If a
reading is outside the limit values, a relay to be specified by the
user is switched.
If the reading reverts to more than a specified hysteresis below or
above the limit value, the alarm is cancelled.
In addition, information about the occurrence of error/status
messages can be provided by means of a collective alarm relay,
see 4.5. Status, warning and error messages.
If multiple alarm messages are activated at the same time,
the last alarm is shown. If the alarm is cancelled again, the
previous messages are no longer shown.
4.3. Commissioning
4.3.1. Assembling the instrument
4.3.1.1. Wall mounting
Attaching rear panel bracket
1.Remove locking screw (see item (4) of drawing below) and
detach rear panel bracket from plastic bracket (see item (2) of
drawing below).
2.Hold rear panel bracket in assembly position and mark the three
drill holes.

4 Transmitter
19
3.Drill three holes (Ø 5 mm) and insert dowels where necessary.
4.Screw on rear panel bracket.
Remember that the clamping brackets (1) must face the wall.
Fastening instrument to rear panel bracket
1.Slide plastic bracket (2) on the back of instrument onto rear
panel bracket until it engages (see arrows).
2.Insert screw (4) through hole (3) and screw into rear panel
bracket.
4.3.2. Connecting the instrument
Opening the instrument

4 Transmitter
20
1.Loosen screw connection (1) of service flap and open the flap.
2.Loosen and remove housing screws (2).
3.Remove upper part of housing from lower part (3) and place on
a clean surface.
WARNING
Electrical voltage
Danger of injury!
> De-energize the mains connection before connecting the
transmitter.
Only have the transmitter wired and connected by
authorized personnel with the voltage disconnected.