Testo 6781 Operating Manual

testo 6781 · Transmitter
P2A software · Parameterizing, adjusting and analyzing

Instruction manual

2

1 Safety and the environment

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1 Safety and the environment

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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

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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

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temperature.

> Do not store the product together with solvents. Do not use any

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desiccants.

> Do not use the instrument for control purposes at the same time

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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

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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

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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.

3

2 About this document

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Protecting the environment

> At the end of its useful life, send the product to the separate

collection for electric and electronic devices (observe local

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2 About this document

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regulations) or return the product to Testo for disposal.

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

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product.

WARNING

CAUTION

Indicates potential serious injuries

indicates potential minor injuries

Symbols and writing standards
Representa-

Explanation

tion

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
[OK]

Elements of the program interface.

Buttons of the program interface.
... | ... Functions/paths within a menu.
“...” Example entries

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4

3 Contents

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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....................................................................................................13

4.2. Product description........................................................................14

4.2.1. System components ......................................................................................14

4.2.2. At a glance.....................................................................................................15

4.2.3. Display and keypad........................................................................................16

4.2.4. Service interface............................................................................................16

4.2.5. Analog outputs...............................................................................................16

4.2.6. Parameters....................................................................................................16

4.2.7. Scaling .........................................................................................................16

4.3. Commissioning..............................................................................17

4.3.1. Mechanical assembly.....................................................................................17

4.3.1.1. Without stainless steel mea surement chamber and cooling coil........18

4.3.1.2. With stainless steel measur em ent chamber (max. 35,000 hPa)........19

4.3.1.3. With stainless steel measurement chamber and cooling coil (max.

35,000 hPa)......................................................................................19

4.3.1.4. Connecting voltage supply and analog outputs.................................20

4.3.1.5. Plug-in connection for power supply and channel.............................21

4.3.2. Adjusting the instrument ................................................................................21

4.3.2.1. Self-adjustment.................................................................................21

4.3.2.2. 1-point adjustment by entering a refere nce value..............................22

4.3.2.3. Analog output adjustment.................................................................23

4.4. Operation.......................................................................................24

4.4.1. Relationship between user menu and mini-DIN socket is active....................24

4.4.2. Password protection ......................................................................................24

4.4.3. Structure of user menu ..................................................................................24

4.4.4. Overview of the testo 6781 user menu...........................................................26

4.4.5. The individual main menus ............................................................................28

4.4.5.1. Editing main menu of channel 1........................................................28

4.4.5.2. Editing Main Menu Alarm..................................................................29

4.4.5.3. Editing Main Menu Settings ..............................................................30

4.4.5.4. Editing Main Menu Analysis..............................................................32

4.4.5.5. Editing Message main menu.............................................................34

5

3 Contents

4.4.5.6. Calling up Main Menu Ident..............................................................35

4.4.5.7. Editing Main Menu Adjust.................................................................35

4.4.5.8. Editing Reset main menu..................................................................37

4.5. Status, warning and error messages ............................................37

4.5.1. Status messages...........................................................................................38

4.5.2. Warning messages........................................................................................39

4.5.3. Transmitter error messages...........................................................................40

4.5.4. Handling alarm messages .............................................................................40

4.6. Maintenance and cleaning............................................................41

4.6.1. Maintaining the instrument............................................................................. 41

4.6.2. Cleaning the instrument.................................................................................41

5 Parameterizing, adjusting and analyzing software (P2A software) . . 42

5.1. Specifications................................................................................42

5.1.1. Functions and use .........................................................................................43

5.1.2. System requirements..................................................................................... 43

5.1.3. Scope of delivery...........................................................................................44

5.2. First steps ..................................................................................... 44

5.2.1. Installing the software/driver.......................................................................... 44

5.2.1.1. Installing P2A software.....................................................................44

5.2.1.2. Installing USB driver.........................................................................44

5.2.1.3. P2A software upgrade......................................................................45

5.2.2. Starting the software......................................................................................45

5.2.2.1. Starting the program......................................................................... 45

5.2.2.2. Establishing a connection wi th the instrument...................................45

5.2.2.3. Activating the connection w ith the instrument...................................45

5.3. Using the software........................................................................46

5.3.1. User interface................................................................................................46

5.3.2. Editing instrument/parameter file ...................................................................48

5.3.2.1. Changing instrument/parameter file..................................................48

5.3.2.2. Creating a new instrument file...........................................................55

5.3.2.3. Saving parameters............................................................................55

5.3.2.4. Opening the parameter file............................................................... 56

5.3.2.5. Copying and pasting parameters......................................................56

5.3.2.6. Deleting instrument/parameter file....................................................57

5.3.3. Analyzing/testing the transmitter....................................................................57

5.3.3.1. Analyzing/testing the instrument....................................................... 57

5.3.3.2. Carrying out factory reset..................................................................57

5.3.3.3. Testing analog output.......................................................................58

5.3.3.4. Displaying min./max. values..............................................................59

5.3.4. Adjusting the transmitter................................................................................60

5.3.4.1. 1-point adjustment............................................................................61

5.3.4.2. Adjusting the analog output.............................................................. 62

5.3.5. Transmitter history.........................................................................................63

6

3 Contents

6

Tips and assistance...............................................................................67

6.1. Questions and answers.................................................................67

6.2. Accessories and spare parts .........................................................67

6.2.1. Ordering options for testo 6781 transmitter (0555 6781)................................69

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7

4 Transmitter

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4 Transmitter

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4.1. Specifications

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4.1.1. Functions and use

The testo 6781 transmitter was developed especially for low
dewpoint temperatures and is suitable for the following
applications, amongst others:

• Compressed air process engineering

• Clean-room technology

• Regulation and monitoring of compressed air driers

• Production and conveyance of gases

• Monitoring of humidity and temperature in medical compressed

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air or granulate driers

4.1.2. Scope of delivery

The scope of delivery of the testo 6781 transmitter includes the
following:

• Assembly accessories

• Operating instructions

• Calibration report

• CD-ROM with operating instructions (PDF) and P2A update

(this can only be used in conjunction with the P2A software,

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which has to be ordered separately).

4.1.3. Accessories

The following accessories are available for the testo 6781
transmitter, amongst others:

• Mains unit

• P2A software (parameterizing, adjusting and analyzing

software)

8

• Assembly accessories

Information about accessories and their order numbers can
be found in Accessories and spare parts or on the
website at www.testo.com.

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4.1.4. Technical data

4 Transmitter

Parameter

1

• Dewpoint temperature

Measuring range at 25 °C

• -90 to 30 °C

td

Meas. uncertainty2

-20 °Ctd to -40 °Ctd: +/-1,5 K

-40 °C

-60 °C

to -60 °Ctd: +/-2 K

td

to -75 °Ctd: +/-2,5 K3

td

The measuring uncertainty increases with high flow values.

1

Above 0 °Ctd the dewpoint temperature is shown and below 0 °Ctd the frost

point temperature is shown. In rare cases at frost point temperatures between

-35 °Ctd and 0 °Ctd differences between the 6781 and a dew mirror hygrometer
may occur.

2

Expanded basic uncertainty (K = 2) at a process temperature of 25 °C.

Measuring uncertainty according to GUM (Guide to the E xpression of Uncertainty in Measurement):
ISO guideline for determining the measuring uncertainty in order to render global measurement results
comparable.

The following uncertainties are used during the inquiry:

• Hysteresis

• Linearity

• Reproducibility

• Adjustment area/factory calibration

• Test location

An additional uncertainty factor independent of the dewpoint temperature and
process of ±0.03 K x reading (in °C

) + 0.2 K x (25 °C - process temperature in

td

°C) results from this overall view
Outside the stated range, a measurement inaccuracy of +/-5K (typically) applies.

3

At process temperatures > 25 °C the lower limit of the measuring range
increases by 0.5 K/K. The uncertainty values are valid for the respective
measuring range.

9

4 Transmitter

Response time

≤ 3 s when changing from -75 °Ctd to -30 °Ctd

t

63

t

≤ 9 s when changing from -75 °Ctd to -30 °Ctd

90

t

≤ 300 s when changing from -30 °Ctd to -75 °C

63

td

t90 ≤ 1080 s when changing from -30 °Ctd to -75 °Ctd

Resolution

Measuring range Resolution

0 to 100 % RH 0.001

0.001 to 28 g/kg 0.001

0.01 to 194 gr/lb 0.01
0 to 31 g/m3 0.001

0.001 to 14 gr/ft3 0.001
1 to 42,500 ppm (vol) 1

-90 to 30 °Ctd 0.1

-130 to 86 °Ftd 0.1

-110 to 30 °C

-165 to 86 °F

0.1

tdA

0.1

tdA

-40 to 70 °C 0.01

-40 to 158 °F 0.01

10

Meas. cycle

• 1/sec

Interface

• Mini-DIN for P2A software (adjustment and parameterization
software)

Voltage supply

• 4-wire (separate signal and supply lines): 20 to 30 V AC/DC,
300 mA power consumption

4 Transmitter

Maximum load

• 4-wire: 500 Ω (power output)

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)

Resolution of analog output

• 12 bit

Display

• 2-line LCD with plain text line (optional)

Operating temperature without display

• -40 to 70 °C

Operating temperature with display

• 0 to 50 °C

11

4 Transmitter

Storage temperature without display

• -40 to 80 °C

Storage temperature with display

• -20 to 80 °C

Process temperature

• -40 to 70 °C

Application humidity

• 0 to 100 % RH

Pressure application range

• 50,000 hPa

Housing, weight

• Metal, 0.5 kg

Process connection

• G 1/2 or

• NPT 1/2"

12

Protection class

• IP 65 only if the transmitter is wired and/or sealing plugs are
inserted

Directives, standards and tests

• EC Directive: 2004/108/EC

• 6781 was manufactured in accordance with EC pressure
equipment Directive 97/23/EC, Article 3 Paragraph 3 as per
"sound engineering practice", taking the regulations to be
observed into account.

Warranty

• Duration: 2 years

• Warranty conditions: see website www.testo.com/warranty

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4.1.5. Dimensions

4 Transmitter

13

4 Transmitter

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4.2. Product description

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4.2.1. System components

Application System components

With clean air and a process pressure

A

corresponding to the presetting of the
measurement chamber (1), a measurement
chamber (1) is required for the rapid

• 1: Measurement chamber

• testo 6781 with
G1/2 thread

assembly (without de-pressurizing the
installation).

With clean air and a process pressure

B

greater than or less than 7000 hPa (1000 to
35,000 hPa) that therefore does not
correspond to the presetting of the inflow
valve, a measurement chamber (1) with a

• 1: Measurement chamber

• 2: Flow meter

• testo 6781 with
G1/2 thread

flow meter (2) is required.

14

4 Transmitter

Application System components

For rapid assembly (without de-pressurizing

C

the installation), a measurement chamber (1)
is required. Connect a filter (4) upstream for
oily media.

• 4: Filter

• 1: Measurement chamber

• testo 6781 with
G1/2 thread

With dry air (max. 140 °C), a PTFE tube (3)

D

is used and the valve of the measurement
chamber (1) is opened to maximum (suitable
up to -60 °C

For process temperatures of 50 °C to 200 °C

E

).

td

and a process pressure corresponding to the
presetting, it is necessary to use a cooling
coil (5) and a measurement chamber (1).
Connect a filter upstream for oily media.

• 3: PTFE tube

• 1: Measurement chamber

• testo 6781 with
G1/2 thread

• Filter, if necessary

• 5: Cooling coil

• 1: Measurement chamber

• testo 6781 with
G1/2 thread

If A to E are not required. The thread is

F

screwed directly into the process.
De-pressurized tube required during
installation.

• testo 6781 with
G1/2 thread

or

• testo 6781 with N1/2"
thread

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4.2.2. At a glance

1 Display (optio nal)
2 Keys (only with optional display)
3 Test contacts
4 M 16 x 1.5 screw connection,

e.g. analog output

5 Service flap with connection for

service plug

6 Screw connection with process

connection (G 1/2 or NPT 1/2")

7 Sintered cap over sensor unit

15

4 Transmitter

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4.2.3. Display and keypad

The display option allows operation of the testo 6781 transmitter via
the display and four keys.

The LCD display consists of one 7-segment line 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

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4.2.4. Service interface

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P2A software.

The parameterizing socket (mini-DIN) is located behind the service

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flap as an interface to the P2A software.

4.2.5. Analog outputs

As analog outputs, the testo 6781 has either

• 1 current output of 0 to 20 mA (4-wire)/4 to 20 mA (4-wire) or

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• 1 voltage output of 0 to 1 V/0 to 5 V/0 to 10 V (4-wire)

4.2.6. Parameters

The following parameters are displayed:

• Relative humidity in % RH (technical)

• Degree of humidity in g/kg and gr/lb

• Absolute humidity in g/m³ and gr/ft³

• Water content in ppm (vol)

• Dewpoint temperature in °C

• Standardized dewpoint (at atmospheric pressure 1013 hPa) in
°C

and °F

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tdA

• Temperature °C and °F

tdA

and °Ftd

td

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.

16

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.

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

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4.3. Commissioning

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range limits are decisive.

4 Transmitter

4.3.1. Mechanical assembly

• Carefully perform assembly work.

• Take special care with leaktightness. We recommend
inserting a metal sealing ring (internal diameter 21 mm).

• Do not use any hygroscopic materials for the sealing.

> Only use force on the union nut.
Depending on the application, there are three different assembly

options:

Assembly Application

Without stainless steel
measurement chamber
and cooling coil

• Process temperatures 0 to 50 °C

• Attachment of the sensor directly in
the process possible

• No fast assembly/dismantling of the
testo 6781 required and sufficient
inflow of the sensor (1 l/min.) exists

17

4 Transmitter

Assembly Application

With stainless steel
measurement chamber

• Process temperatures 0 to 50 °C

• Fast assembly/dismantling of the

testo 6781 required and/or

• No sufficient inflow of the sensor

(1 l/min.) exists

With stainless steel

• Process temperatures 50 to 200 °C

measurement chamber
and cooling coil

4.3.1.1. Without stainless steel measurement chamber and cooling
coil

CAUTION

Compressed air! Danger of injury!

> De-pressurize pipe sections (e.g. compressor off or use of

bypass) and vent them before opening.

Clamp ring screw connection is already pre-assembled.
Screw connection body (1) and union nut (2) have a point­shaped marking (4).

18

1. Screw thread in process.

2. Turn housing (3) to desired position without much exertion
of energy.

3. Tighten union nut (2) finger-tight.

4. Hold screw connection body (1) with a suitable spanner.

5. Tighten union nut (2) slightly past the marking (4).

An increased resistance can be felt when tightening.

4 Transmitter

6. Close ventilation of the pipe section and pressurize the pipe
section again.

4.3.1.2. With stainless steel measurement chamber (max. 35,000 hPa)

1. Connect measurement chamber without testo 6781 transmitter
to quick-release compressed-air fastener for approx. 10 - 30
sec. to blow out any dirt deposits.

2. Remove measurement chamber from quick-release
compressed-air fastener.

3. Screw process connection (G1/2) of the testo 6781 transmitter
into the thread of the measurement chamber.

4. Mount 6781 as described under Without stainless steel
measurement chamber and cooling coil page 18.

5. Engage quick-release fastening of the measurement chamber
in the standardized socket of the compressed air line.

4.3.1.3. With stainless steel measurement chamber and cooling coil
(max. 35,000 hPa)

1. Connect measurement chamber without testo 6781 transmitter

to quick-release compressed-air fastener for approx. 10 - 30
sec. to blow out any dirt deposits.

2. Remove measurement chamber from quick-release

compressed-air fastener.

3. Screw process connection (G1/2) of the testo 6781 transmitter

into the thread of the measurement chamber.

4. Mount 6781 as described under Without stainless steel

measurement chamber and cooling coil page 18.

5. Engage quick-release fastening of the measurement chamber

in quick-release fastening of the cooling coil.

6. Engage second quick-release fastening of the cooling coil in the

standardized socket of the compressed air line.

19

4 Transmitter

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4.3.1.4. Connecting voltage supply and analog outputs

Wiring diagram for 4-wire system (0 to 20 mA/4 to 20 mA/0 to
1 V/0 to 5 V/0 to 10 V)

1-channel
0 to 20 mA/4 to 20 mA

max. load per 500 Ω
0 to 1 V/0 to 5 V/0 to
10 V

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20

Requirement for the connecting cable of the supply:

• Shielded and insulated with cross-section of at least

0.25 mm

2

.

• The supply line must be secured against exceeding 8 A.

• An OFF switch must be installed in an easily accessible
position close by and be marked as such.

4.3.1.5. Plug-in connection for power supply and channel

M12 plug-in connection (5-pin) connector
View of the plug-in connection in the installed state from outside

PIN Assignment

1 -24 V
2 +24 V
3 + Ch1
4 - Ch1
5 PE

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4.3.2. Adjusting the instrument

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4.3.2.1. Self-adjustment

Conventional trace humidity sensors show a steep rise in
measuring uncertainty at low humidities. With the trace humidity
sensor of the testo 6781, these measuring uncertainties are
corrected by means of an automatic self-adjustment process. This
means that extremely accurate measuring results are also attained
in the range up to -90 °C

To this end, a temperature sensor which is used as a heater is
fitted on the back of the sensor element. A humidity and
temperature value pair is taken in both the unheated and heated
state. The deviation of the probe obtained from these pairs of
values is automatically corrected.

.

td

4 Transmitter

21

4 Transmitter

• Deactivating the self-adjustment function of the testo
6781 will reduce measuring accuracy and should
therefore be restricted to the shortest possible length of
time.

• During the self-adjustment phase, the analog outputs,
the display value and the output value are "frozen".

Self-adjustment active is shown in the display until it

has finished. The self-adjustment time (incl. heating
time, calculation time, cooling time) is 30 minutes. The
cycle time can be edited in the P2A software, see Self­adjustment page 54.

• At temperature wn > 0 °C, the self-adjustment time
becomes longer.

4.3.2.2. 1-point adjustment by entering a reference value

Using the 1-point adjustment, you can enter a reference value for
one of the working points you have selected (e.g. -40 °C
this, you achieve a minimum target/actual deviation around this
working point.

But the further away the measurement is from the working point,
the greater the deviation can become. The 1-point adjustment
should therefore only be used for a relatively narrow measuring
range (working range)

✓ A reference measuring instrument (e.g. dewpoint mirror

hygrometer) is ready.

1. Expose the reference measuring instrument and testo 6781 to
the same constant conditions and wait for the equalization
period to expire.

The ideal accuracy is reached when at least two adjustment
cycles are run through at dewpoint temperatures above -60
°C

, whereby four adjustment cycles are recommended at

td

dewpoint temperatures below -60 °C

.

td

2. Measure the reference value and compare with the reading of
the testo 6781.

3. In the event of deviations of the values: Enter reference value

• via the user menu (see Enter reference value for 1-point

adjustment page 35) or

• via the P2A software (see 1-point adjustment page 61).

). With

td

22

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4.3.2.3. Analog output adjustment

The purpose of adjusting the analog outputs is to adjust the signal
chain from the digital signal (within the transmitter) to the analog
outputs. The signal type that was appointed for the transmitter is
adjusted respectively for each channel (e.g. 4 to 20 mA or 0 to 1 V,

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etc.).

Adjusting the analog output

✓ Load of max. 500 Ω is connected to channel 1 (see Plug-in

connection for power supply and channel page 21)

✓ A precise multimeter (minimum requirement: resolution 6.5

digits, at least 5-times more accurate than the 6781) is
available.

If only a simple multimeter is available, the analog outputs
may not be adjusted.

1. Connect the inputs of the multimeter with the contacts (1) and
(2) for channel 1.

2. Transfer the reference analog value measured with the
multimeter into the P2A software (see Adjusting the analog
output page 62) or enter it via the user menu (see Performing
analog adjustment page 36).

3. Disconnect connections between the multimeter and the
contacts of the testo 6781.

4 Transmitter

1 Contact ch. 1+

2. Contact ch. 1-

3. Service interface

23

4 Transmitter

4.4. Operation

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4.4.1. Relationship between user menu and mini-DIN
socket is active

The testo 6781 can be parameterized using either the user menu or
the P2A software (see Parameterizing, adjusting and analyzing
software (P2A software) page 42).

The testo 6781 transmitter can only be operated via the
display and keypad if the display option is available.

If the testo 6781 is connected to the P2A software, the user
menu is blocked for the duration of the communication. The
message Service plug is shown in the display of the testo

6781. As soon as the P2A software is disconnected, the

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user menu is accessible again.

4.4.2. Password protection

The user menu can be protected with a four-digit numerical code
(see Calling up Main Menu page 35) so that access to the user
menu is denied to unauthorized persons not familiar with this
numerical code.

If the password protection is not to be used, the numerical code

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"0000" must be entered. This is also the status upon delivery.

4.4.3. Structure of user menu

At the main menu level, the user menu comprises the following:

• Main Menu Channel 1

• Main Menu Alarm

• Main Menu Settings

• Main Menu Analysis

• Main Menu Messages

• Main Menu Ident

• Main Menu Adjust

24

• Main Menu Reset

4 Transmitter

1 Display for messages
2 Channe l 1 display

Four keys enable the user to navigate/scroll through the menus and
enter/amend values and settings:

Key Function/description

SET

• In Measuring Mode: changes to
parameterization

• In Parameterizing Mode: confirms a
selection or setting

ESC

• Leaves a menu (without modifying any
settings)

X • Selecting: scrolls through menus

(downwards) or selectable alternatives

• Editing: changes to next digit (to the right)

S • Selecting: scrolls through menus (upwards)

or selectable alternatives

• Editing: increases the value of the current
digit by 1

25

4 Transmitter

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4.4.4. Overview of the testo 6781 user menu

26

4 Transmitter

27

4 Transmitter

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4.4.5. The individual main menus

4.4.5.1. Editing main menu of channel 1

An overview is given in Overview of the testo 6781 user menu,
page 26).

You can perform basic settings for channel 1.

1. In the Measuring Mode press SET, select Main Menu

Channel 1 with X or S and confirm selection with SET.

One of the following parameters can now be selected using X
or S, after which the selection must be confirmed with SET:

• Channel 1 Unit
The parameter for this channel is selected.
Edit/select parameter with X or S, confirm with SET or abort

entry with ESC.

• Scale minimum for channel 1:
The lower scale limit is edited; Unit as selected above.
Editing the value: Scroll one digit to the right using X and

increase value of digit by 1 using S. Confirm with SET or abort
entry with ESC.

• Scale maximum for channel 1
The upper scale limit is edited;
Unit as selected above.
Editing the value: Scroll one digit to the right using X and

increase value of digit by 1 using S. Confirm with SET or abort
entry with ESC.

• Signal delay ("Attenuation") for channel 1
The analog signal can be delayed ("Attenuation"); a time

constant is selected for this (1 = no delay; 15 = longest delay)
Edit/select parameter with X or S, confirm with SET or abort

entry with ESC.

2. Continue to the main menu with X or S or return to Measuring

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Mode with ESC.

28

4.4.5.2. Editing Main Menu Alarm

The alarm statuses are shown on the display. You can choose
whether the alarm is to be used to monitor limit values or as a
collective alarm. If an alarm is to be used to monitor limit values,
you can choose between monitoring the minimum or maximum
value and set a limit value and hysteresis for each alarm.

In addition, every alarm can be linked to a clearly visible visual
alarm (display background lighting flashes).

An alarm delay between 0 and 240 seconds can still be assigned to
every alarm used for limit value monitoring so that the visual alarm
is delayed. If the alarm status goes out within the set alarm delay
time, the visual alarm is not triggered. .

With an alarm status present, the visual alarm can be reset by
means of acknowledgement. The triggering of a new alarm cannot
be enabled until after the alarm status goes out.

1. In the Measuring Mode press SET, select Main Menu Alarm
with X or S and confirm selection with SET.

- Four alarms can be parameterized.

2. Select Alarm x with X or S and confirm selection with SET.

4 Transmitter

Using alarm to monitor limit values

Monitoring minimum Monitoring maximum

Hysteresis

Limit value Limit value

Hysteresis

3. Select Channel x (e.g. "Channel 1") with X or S and confirm
selection with SET.

4. Select Max control or Min control with X or S (see graphic).

5. Press SET and edit Limit value as well as Hysteresis: Scroll
one digit to the right using X and increase value of digit by 1
using S. Confirm with SET or abort entry with ESC.

6. Select Visual alarm with X or S. Select YES or NO with X or
S. Confirm with SET or abort entry with ESC.

7. Press SET and edit Alarm delay: Scroll one digit to the right
using X and increase value of digit by 1 using S. Confirm with

SET or abort entry with ESC.

8. Return to Channel x with ESC.

29

4 Transmitter

9. Return to Alarm x with ESC.

10. Change to the other alarms using X or S and perform settings

Using alarm as collective alarm or not using it at all

If an alarm is assigned to the collective alarm, the display flashes
as soon as (at least) one of the warning or error messages of the
testo 6781 transmitter becomes active.

✓ Alarm is selected (see previous steps 1 and 2).

1. Use X or S to determine whether Alarm x should be used as a

2. If collective alarm is selected: Select Visual alarm with X or S.

3. Change to another alarm using X or S and perform settings in

4. Return to Main Menu Alarm with ESC.

5. Continue to Main Menu Settings with X or S or return to

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in the same way.

The messages affecting the collective alarm can only be
selected in the P2A software, see Using the software page
46

Collective alarm or not used. Confirm selection with SET.

Select YES or NO with X or S. Confirm with SET and return to

Alarm x.

the same way.

Measuring Mode with ESC.

4.4.5.3. Editing Main Menu Settings

You can edit instrument settings and other settings.
> In Measuring Mode, press SET, select Main Menu Settings

using X or S and confirm selection with SET.

You can edit settings for:

• Display

• Language

• Code

• Unit

◦ Absolute pressure
◦ Temperature

• Humidity process data

30

4 Transmitter

Editing display settings

You can set the brightness and contrast of the display.

1. Select Display Settings with X or S and confirm selection with

SET.

2. Select Backlight or Contrast with X or S and confirm
selection with SET.

One of the following parameters can now be selected using X or
S, after which the selection must be confirmed with SET:

• Backlight
The display illumination is changed.
Edit/select parameter with X or S, confirm with SET or cancel

entry with ESC (the effect of the change in parameter can be
seen during input).

• Contrast
The brightness difference between the display background and

the displayed values is changed.
Edit/select parameter with X or S, confirm with SET or cancel

entry with ESC (the effect of the change in parameter can be
seen during input).

• Backlight 24h on
Select On or Off using X or S and confirm with SET.
Off: The display light switches off automatically if no button was

pressed for 10 seconds.
On: The display light is activated

3. Return to Display Settings with ESC and useX or S to
continue to Language.

Selecting language

You can se

lect the language for the plain text line in the display.

> Press SET, select required language with X or S, confirm

selection with SET and return to Language.

Only choose a language that you can understand well.

31

4 Transmitter

Editing code settings

You can set the access code (password).

1. Select Code with X or S and confirm selection with SET.

2. Scroll one digit to the right using X and increase value of digit

3. Return to Code with ESC and useX or S to continue to

Select unit

This setting affects the unit of the process data.

1. Press SET, select Change parameters with X or S, confirm

2. Select Change unit with X or S, confirm selection with SET or

3. Select the required variable (absolute pressure/temperature)

4. Select the required unit with X or S, confirm selection with SET

5 Return to Change unit with ESC.

6. Select Hu

7. Select Humidity process pressure with X or S, confirm

8. Scroll one digit to the right using X and increase value of digit

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9. Return to Main Menu Settings by pressing ESC three times.

If a code other than "0000" (factory setting) is set, the
transmitter can only be operated once this code has been
entered via the menu.

by 1 using S. Confirm with SET or abort entry with ESC.

Change parameters.

selection with SET or cancel with ESC.

cancel with ESC.

with X or S, confirm selection with SET or cancel with ESC.

or cancel with ESC.

midity process data with X or S, confirm selection

with SET or cancel with ESC.

selection with SET or cancel with ESC.

by 1 using S. Confirm with SET or abort entry with ESC.

4.4.5.4. Editing Main Menu Analysis

You can check the function of analog outputs. In addition, you can
read off the minimum and maximum values (since the last voltage
supply or reset of the min./max. values).

32

Testing functionality of analog outputs

This function affects the analog outputs directly, not only
the test contacts.

1. In the Measuring Mode press SET, select Main Menu Analysis

- Test Analog Output is shown.

2. Press SET, scroll one digit to the right using X and increase

3. Accept setting by pressing SET and test with multimeter

3. Return to Test Analog Output with ESC and continue to

Reading off min./max. values of channels

To reset the max./min. values, see Editing Reset main menu page
37

1. Read off the min./max. values of the channel in succession with

2. Continue to Main Menu Message with X or S or return to

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4 Transmitter

with X or S and confirm selection with SET.

value of digit by 1 using S. Any analog output value can be
predefined, e.g. for an analog output of 4 to 20 mA, the value
"6.0 mA". Confirm with SET or abort entry with ESC.

(minimum requirement: resolution 6.5 digits, at least 2-times
more accurate than the 6781) as follows:

Analog output 1: Via test contacts under service flap, see
diagram.

1 Channe l 1

test contacts

2 Multimeter

Max./min. values with X or S.

X or S and return to the Main Menu Analysis with ESC.

Measuring Mode with ESC.

33

4 Transmitter

4.4.5.5. Editing Message main menu

Messages can be confirmed/acknowledged, the last messages can
be called up and the display of the messages can be switched on
or off.

Using the P2A software (see Parameterizing, adjusting and
analyzing software (P2A software) page 42) you can
predefine whether messages are to be shown in the
display.

1. In the Measuring Mode press SET, select Main Menu Message

with X or S and confirm selection with SET.

2. Confirm Confirm message using SET.

3. Select Last messages with X or S and confirm with SET.

4. Scroll between the warning and error messages recorded so far

using X or S and return to Last messages using ESC.

5. Select Information with X or S and confirm with SET.

6. Scroll between the status messages recorded so far using X or

S and return to Information using ESC.

7. Continue to Display of message with X or S.

ON: Measurements are shown on the display in Measuring

Mode.

OFF: No messages shown on display.

8. Select ON or OFF with X or S and confirm selection with SET.

9. Return to Main Menu Message with ESC.

1 Message text
2 Additional information on

the message

3 Message num ber

(example: "4/7" refers to
the fourth of seven
messages)

4 Number of messages

present (example: "4/7"
refers to the fourth of
seven messages)

5 Message code (see

Status, warning and
error messages page

37).

34

10. Continue to Main Menu Ident with X or S or return to
Measuring Mode with ESC.

An overview of the messages can be found in Status,

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4.4.5.6. Calling up Main Menu Ident

warning and error messages page 37

4 Transmitter

1 Serial number
2 Instrument type
3 Build number

4. Firmware
version

1. In the Measuring Mode press SET, select Main Menu Ident
with X or S and confirm selection with SET.

- The type, firmware version, build number and serial number of
the transmitter are displayed.

This information is required when servicing.

2. Return to Main Menu Ident with ESC.

3. Continue to Main Menu Adjust with X or S or return to

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Measuring Mode with ESC.

4.4.5.7. Editing Main Menu Adjust

A reference value can be entered for the temperature (°C/°F) and a
reference value can be entered for the dewpoint (°C
1-point adjustment. Please refer to the description in Adjusting the
analog output page 62.

In addition, the analog outputs can be adjusted. Also see Analog
output adjustment page 23 for instructions on how to do this.

Enter reference value for 1-point adjustment

Please also refer to Analog output adjustment page 23.

1. In the Measuring Mode press SET, select Main Menu Adjust
with X or S and confirm selection with SET.

2. Select Reference value temp or Reference value Td with X
or S.

/°Ftd) for the

td

35

4 Transmitter

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3. Press SET, edit value: Scroll one digit to the right using X and

increase value of digit by 1 using S. Confirm with SET or abort
entry with ESC.

4. Continue to Analog Adj. Ch. 1 with X or S.

5. Continue with the adjustment of the analog outputs (see below,

step 2) or press ESC to return to Main Menu Adjust.

Performing analog adjustment

Please refer to Analog output adjustment page 23.

1. In the Measuring Mode press SET, select Main Menu Adjust

with X or S and confirm selection with SET.

Each channel is adjusted at three points in the analog
range (at 10 %; 50 %; 90°% of the analog scale).

2. Select Analog Adj. Ch. 1 with X or S and confirm with SET.

3. Use X or S to select Adj. Point 1.

4. Press SET. Read off multimeter display (e.g. 5601 mA) and

enter this value in the user menu. Do this by scrolling one digit
to the right using X and increasing the value of digit by 1 using
S. Confirm with SET or abort entry with ESC.

5. Use X or S to select Adj. Point 2.

6. Press SET. Read off multimeter display (e.g. 12,001 mA) and

enter this value in the user menu. Do this by scrolling one digit
to the right using X and increasing the value of digit by 1 using
S. Confirm with SET or abort entry with ESC.

7. Use X or S to select Adj. Point 3.

8. Press SET. Read off multimeter display (e.g. 18,401 mA) and

enter this value in the user menu. Do this by scrolling one digit
to the right using S and increasing the value of digit by 1 using
X. Confirm with SET or abort entry with ESC.

9. Return to Main Menu Adjust with ESC.

10. Continue to Main Menu Reset with X or S or return to

Measuring Mode with ESC.

36

4.4.5.8. Editing Reset main menu

You can reset the factory settings for the following:

• Instrument

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4.5. Status, warning and error messages

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• Min./max. values

Resetting to the factory settings means resetting to the
order specification, i.e. the specific condition at the time of
supply to the customer.

1. In the Measuring Mode press SET, select Main Menu Reset
with X or S and confirm selection with SET.

- Reset Device to factory settings is displayed.

2. Select the setting to be reset using X or S and confirm
selection with SET.

- Reset Completed is displayed.

3. Return to the reset setting with ESC or SET and return to Main

Menu Reset with ESC.

4. Continue to the Main Menu Channel 1 with X or S or return to
Measuring Mode with ESC.

To achieve optimum operational reliability (machine availability),
the transmitter shows the following via the user menu or the P2A
software

• Status messages

• Warning messages

• Error messages

in each case for the testo 6781 transmitter.
All messages are stored in the transmitter with an operating hours

stamp. Use the user menu (see Editing Message main menu page

34) or the P2A software (see Transmitter history page 63) to view

the message history.
In the transmitter, the last 60 status messages and the last 120

error and warning messages are stored in a ring memory. There is
no limit in the P2A software.

4 Transmitter

37

4 Transmitter

4.5.1. Status messages

Status messages show the current operating status of the testo

6781.

Message Display Description

02506

Sensor
initialization

01D19 Service plug

00300 New limit value

00301 Scaling changed The scaling has been changed
02104 Analog out adjust

00500 Transmitter reset

0052F Reset Min/Max

00503

Reset device to
fact

00307

User Setting
Change

Message appears while the
transmitter is starting up. If the
message disappears, the
transmitter is ready for operation.

The Mini-DIN socket is connected
to: the USB adapter for P2A
software, the adjustment adapter
or the service plug (is not
recorded/no number)

The limit value has been changed
or shifted

An analog adjustment has been
made

The transmitter was reset to the
factory settings and is restarted.

Resets all saved Min/Max values
for all channels

A factory reset of the transmitter
was performed

User Setting Change: General
settings were changed for the
transmitter

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38

4 Transmitter

4.5.2. Warning messages

Warning messages show an early warning or a current malfunction

Message Display Cause Remedying of fault

00E00 T ambient high

00E01 T ambient low

00E02/00E
05

0081C Alarm 1

0081D Alarm 2

0081E Alarm 3

0081F Alarm 4

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which may negatively impact measuring.

The ambient
temperature exceeds
the permissible
temperature for the
transmitter.

The ambient
temperature is below
the permissible
temperature for the
transmitter.

Supply voltage
low

The supply voltage is
below the minimum
voltage required for the
transmitter.

Depending on the
parameterization of the
alarm.

Depending on the
parameterization of the
alarm.

Depending on the
parameterization of the
alarm.

Depending on the
parameterization of the
alarm.

Take necessary
measures to lower
ambient temperature,
e.g. through venting or
cooling.

Take necessary
measures to raise
ambient temperature,
e.g. through heating.

Take measures to
ensure sufficient
voltage supply.

Depending on the
parameterization of the
alarm.

Depending on the
parameterization of the
alarm.

Depending on the
parameterization of the
alarm.

Depending on the
parameterization of the
alarm.

39

4 Transmitter

4.5.3. Transmitter error messages

Message Display Cause Remedying of fault

01505 Watchdog error

01115

01116

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4.5.4. Handling alarm messages

Error messages show a current malfunction.

Due to a processor
error, the transmitter
performs an automatic

If the problem occurs
frequently, contact
Testo Service.

restart.

Low adjustment
temperature

High adjustment
temperature

Shown on the
display

4

The ambient
temperature is too low
during the pressure
adjustment.

The ambient
temperature is too high
during the pressure
adjustment.

Can be used for
collective alarm5

Take necessary
measures to raise
ambient temperature,
e.g. through heating.

Take necessary
measures to lower
ambient temperature,
e.g. through venting.

Additional
message end6

New limit value x
Scaling changed x
Alarm 1 x
Alarm 2 x
Alarm 3 x
Alarm 4 x
Transmitter reset x
Analog out adjust x

4

If multiple messages/alarms are activated at the same time, only the last
message/alarm is shown. If this is cancelled, the other messages that are still
active are no longer displayed.

5

The message can be assigned the collective alarm function, which means that
the collective alarm is activated as soon as at least one of the messages
assigned to it is activated.

6

The message is shown upon the occurrence of the event causing the message
as well as when closing. Two entries appear in the history in the P2A software:
Message text_start and Message text_end.

40

4 Transmitter

Shown on the
display4

Can be used for
collective alarm5

T ambient high x x
T ambient low x x
Supply voltage low x x
Watchdog error x

Perform the Confirm message function (acknowledgement of the
alarm via the control keys on the transmitter):

• The message/alarm is no longer shown on the display and the
optical alarm goes out, where applicable. If multiple
messages/alarms are active at the same time, all are reset
simultaneously.

• If at least one message is assigned to the collective alarm, the

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4.6. Maintenance and cleaning

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collective alarm is reset.

4.6.1. Maintaining the instrument

We recommend that the adjustment and settings of the transmitter
be checked at regular intervals using the

• User menu (Operation page 24) or

• P2A software (Parameterizing, adjusting and analyzing software
(P2A software) page 42)

Additional
message end6

4.6.2. Cleaning the instrument

• Only clean the instrument carefully with a moist cloth.

• Do not use aggressive cleaning agents.

• Do not use any solvents.

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41

• Do not touch or damage the sensor.

Protection cap, measurement chamber, cooling coil

If used in process conditions involving oil or dust, the protection cap
and, if used, the measurement chamber and cooling coil must be
cleaned regularly.

• Unscrew/remove protection cap, measurement chamber and
cooling coil and blow out with compressed air or place in an
ultrasonic bath.

5 Parameterizing, adjusting and analyzing software (P2A software)

• Replace a heavily soiled protection cap with the same type of

protection cap.

The accuracy is only maintained when the ordered
protection cap is replaced by the same type of protection
cap.

Sensor cleaning

During sensor cleaning, avoid any contact with the sensor.

Do not mechanically clean the sensor, as otherwise the
cover electrode may be damaged.

1. Carefully unscrew protection cap.

2. Carefully rinse with isopropanol and/or distilled water.

3. Allow sensor to dry thoroughly.

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4. Screw on protection cap.

5 Parameterizing, adjusting and analyzing

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5.1. Specifications

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software (P2A software)

The P2A software is used for the parameterizing, adjustment and
analysis of testo transmitters. The following applies:

• Generally, all newer testo transmitters (as of 2007) are

supported.

• Included with every testo transmitter that is bought new is a CD

that contains a free upgrade of the software, which includes the
device drivers for all transmitters that can be attached at this
time.

• This upgrade can be downloaded at any time via the testo

homepage "www.testo.com/Download/P2A".

The software must only be bought one time, even for owners of
several testo transmitters.

42

5 Parameterizing, adjusting and analyzing software (P2A software)

5.1.1. Functions and use

In the P2A software, two different file types are used: The
instrument and the parameter file.

Instrument file

The parameters of a particular transmitter are stored in its so-called
instrument file. Using this file, the parameters can be edited and the
instrument can be tested and adjusted.

Instrument files also contain the respective histories in addition to
the parameter data, i.e. "log books" are kept for the previous
parameterizations, adjustments and messages (see Transmitter

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history page 63).

Instrument files are ".cfm" format files.

Parameter file

Parameter files are not tied to a specific individual transmitter and
contain only parameter data/no history data.

If you use various instruments of the same type, you can create
parameter files once (e.g. by saving the appropriate instrument file
as the parameter file) and transmit these onto the other
instruments.

Parameter files are ".cfp" format files.

5.1.2. System requirements

Operating system

• Windows® 2000 SP4

• Windows® XP Home/Professional

• Windows® Vista

Computer

• Pentium processor of at least 400 MHz or equivalent

• 128 MB RAM

• Graphics resolution of at least 1024 x 768

• Unused hard drive capacity of at least 15 MB

• CD-ROM drive

• USB interface

43

5 Parameterizing, adjusting and analyzing software (P2A software)

• At least Internet Explorer 5.0.

Software

The P2A software must be purchased and installed separately from
the transmitter. If it is a new software version, the transmitter is
already supported completely. Older P2A software versions can be
updated via the P2A software upgrade (cf. product CD included

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with the transmitter).

5.1.3. Scope of delivery

Included in the scope of delivery are:

• P2A software

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5.2. First steps

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5.2.1. Installing the software/driver

• USB driver

When working with the parameterizing, adjusting and
analyzing software (P2A software), previous knowledge of
Windows

®

operating systems is assumed. The description

in this instruction manual relates to Windows

Administrator rights are required to install programs and
drivers under Windows® 2000 SP4, XP and Vista.

®

XP.

5.2.1.1. Installing P2A software

1. Insert CD with P2A software.
✓ If the installation program does not start automatically:

> Open Windows Explorer and start the file Setup.exe on the

product CD.

2. Follow the directions of the installation wizard.

5.2.1.2. Installing USB driver

Before installing the USB driver, please read the separate

44

documentation that is enclosed with the USB driver CD.

5 Parameterizing, adjusting and analyzing software (P2A software)

5.2.1.3. P2A software upgrade

1. Insert product CD (supplied with the transmitter).

2. Open Windows® Explorer and start the file P2A upgrade.exe
on the product CD.

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3. Follow the directions of the installation wizard.

5.2.2. Starting the software

5.2.2.1. Starting the program

> Select: [Start] > All Programs > Testo > P2A Software.

- The program window is opened (see User interface page 46).

5.2.2.2. Establishing a connection with the instrument

Multiple instruments can be attached, however only one connection
is active at all times.

✓ USB driver is installed (see Installing USB driver page 44).

1. Start the P2A software.

2. Connect adapter (supplied with the P2A software) to the service
interface of the instrument (see Service interface page 16).

3. Connect instrument/adapter to the PC via the USB interface.

- The instrument file of the attached instrument is shown in the
file list.

5.2.2.3. Activating the connection with the instrument

> Click on the desired instrument file.

- The selected file is marked in colour and the connection with
the instrument is activated.

If a connection with the instrument is established when the program
is started, the corresponding instrument file is marked
automatically.

45

5 Parameterizing, adjusting and analyzing software (P2A software)

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5.3. Using the software

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5.3.1. User interface

46

1 Menu bar:

Menu Command Explanation

File Open

Shows the Windows dialogue for
searching and opening files.

Save as

Saves the parameters of an
instrument or parameter file
under a new name.

Edit Copy

Copies the parameters of the
marked instrument or parameter
file in the cache.

Paste

Pastes the parameters from the
cache in the marked instrument
or parameter file.

View Toolbar

Status bar

Activates/deactivates the toolbar
or status bar.

5 Parameterizing, adjusting and analyzing software (P2A software)

Menu Command Explanation

?

Check instrument
connections

Checks the connections to a
connected instrument without the
instrument having to be
activated.

Service

A text file with the most important
information on the computer and
the software is opened via

Display service data.

Information

Shows the version number of the
P2A software.

2 Toolbar: Shows the Windows-compliant icons for editing.
3 File:

Icon File Explanation

Symbol shows a
transmitter

Instrument
file

Instrument file
Connection to the instrument has

been established.

<Type> <Serial number>.cfm

File name should not be
changed.

Symbol shows a
transmitter with a red
minus sign in the upper
left corner

Symbol shows a
transmitter with a white
P for parameter file in
the upper left corner

Instrument
file

Parameter
file

Instrument file
Connection to the instrument has

not been established.

<Type> <Serial number>
<Date> <Time>.cfp

File name can be changed.
The name can be selected freely,

but it is recommended that you
retain the reference to the
instrument.

Parameter files are always
marked red; the parameter
values they contain are only
forwarded to the instrument after
being transmitted to the
instrument file.

47

5 Parameterizing, adjusting and analyzing software (P2A software)

4 Function buttons: Dialogues on editing and testing the

instrument are opened by means of the buttons.

[Change parameterization] see Changing instrument/parameter

file page 48

[Test/analyze transmitter] see Chapter Analyzing/testing the

transmitter page 57

[Adjusting the transmitter] see Chapter Adjusting the transmitter

page 60

[Transmitter history] see Transmitter history page 63

5 File information:

Status Shown in the window

An instrument file is
selected

A parameter file is
selected

Type, serial number, firmware version of the
instrument.

Type, serial number and firmware version of
instrument for which the parameter file was
created.

Connection status Green = connection is active

Red = connection is inactive

6 Status bar: Shows the current status when editing via the menu

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bar.

5.3.2. Editing instrument/parameter file

5.3.2.1. Changing instrument/parameter file

✓ The desired instrument/parameter file is marked.

1. Click on [Change parameterization].

- The Properties of <Instrument type> <Serial number>

dialogue is opened with the Change parameterization register.

If the parameters were transmitted from other parameter files into
the instrument file, a message is shown with which you can
transmit the new parameters to the connected instrument using

[Yes].

> If the parameters should not be transmitted, click on [No].

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48

2. Change or enter parameters in the corresponding fields.

5 Parameterizing, adjusting and analyzing software (P2A software)

Field Explanation

Unit/
Analog output

All analog outputs are parameterized in this
mask.

Unit/analog output
(graphic)

Unit: 0 to 1 V/5 V/10 V or 0...20 mA, 4 to 20
mA.

Vertical: Current version of the analog output
(cannot be changed).

Horizontal: Min./max. scale end points of
selected unit.

The curve changes in accordance with the
entered value of scale minimum and

maximum.
Scale minimum/
maximum

The endpoints of the scaling can be selected

up to the stored scale minimum and

maximum. In the process, scaling can take

place beyond the measuring range in order

to adjust the analog output to the customer

system.
Unit Selection of the physical unit.

When changing the unit, standard values are

set for scale minimum and maximum.
Signal delay

(graphic)

49

Curve changes according to the set signal

delay.

5 Parameterizing, adjusting and analyzing software (P2A software)

Field Explanation

Signal delay Time interval in stages 1 – 15:

1 = no delay
15 = longest delay.
The signal delay is added to the reaction time

of the sensor. The signal delay shows
averaging over the time interval of the
selected stage in seconds:

Example
Stage 10 = average of the readings from the

last 10 seconds.

The delay of the signal in relation to the change in the
process is also significantly influenced by the selection of

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the particle filter.

Field Explanation

Alarm values, alarm 1 to 4

In this mask, the display alarms
are parameterized.

50

Alarm x Four alarm values are available.
Not used Alarm is not used.

Hysteresis image and input
options are hidden.

5 Parameterizing, adjusting and analyzing software (P2A software)

Field Explanation

Collective alarm

If selected messages appear, a
collective alarm can be triggered.
Selection of the messages (OR
linkage) by selecting the
checkbox.

Min control

If switched to ON (NO contact) or
OFF (NC contact) under the limit
value; in the event of a
subsequent exceeding of Limit

value plus Hysteresis, it is

switched to OFF (NO contact) or
ON (NC contact).

Max control

If switched to ON (NO contact) or
OFF (NC contact) above the limit
value; in the event of a
subsequent undershooting of

Limit value minus Hysteresis, it

is switched to OFF (NO contact) or
ON (NC contact).

The graphic display in the centre of the screen refers to
the relay wiring as a NO contact (ON).

Hysteresis To avoid switching cycles.
Channel

Selection of the channel that is to
be monitored.

51

5 Parameterizing, adjusting and analyzing software (P2A software)

Field Explanation

Limit value

Values for the limits of the unit
selected in Unit/analog output; 4
decimal places.

When changing the phys. unit, the
limit values are set to the default
values.

Visual alarm display

Checkbox is activated: Upon the
appearance of the selected alarm,
the background lighting of the
display flashes.

Response delay

The desired response delay for
the alarms of the min/max control
and the visual alarm is entered in
the input field (0 to 240 seconds
possible).

The response delay has no effect
on the collective alarms.

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Field Explanation

Basic settings Setting the absolute pressure.

52

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5 Parameterizing, adjusting and analyzing software (P2A software)

Field Explanation

Absolute pressure

The absolute pressure is included in the

calculation of the following units:

• °C

or °Ftd

td

• g/kg or gr/lb

• ppm (vol)

Field Explanation

Display

Setting the display functions (if a display is
available on the transmitter).

Continuous display

Display lighting is permanently switched on.
lighting

Display lighting
when button is

When a particular button on the instrument is

pressed, the display lights up for 10 seconds.
pressed
(10 seconds)

Display brightness
(0 to 9)

Setting the brightness between 0 and 9:

0 = dark

9 = light
Display contrast

(0 to 9)

Setting the contrast between 0 and 9:

0 = low contrast

9 = high contrast

53

5 Parameterizing, adjusting and analyzing software (P2A software)

Field Explanation

Display of the error
messages

Selection of whether the error messages

should be shown in the display.
Display language Selection of the language.
New password

The password consists of four numbers,

each of which must be between 1 and 9.

If the password protection is not to be used,

the numerical code "0000" must be entered.
[Adopt new

Button for confirming the new password.
password]

Valid password Display of the current password.

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Field Explanation
Self-adjustment

Setting the self-adjustment.

54

Activate self­adjustment for
transmitter

• Checkbox is activated: The self­adjustment is performed in the set cycle.

• Checkbox is not activated: The self­adjustment is not performed.

5 Parameterizing, adjusting and analyzing software (P2A software)

Field Explanation

Cycle time

Setting the cycles in which the self­adjustment is to be performed:

• 1 hour

• 7 hours

• 12 hours

• 24 hours
In order to receive reliable readings

during the calibration or equalization
period of the transmitter, testo
recommends the shortest possible
cycle time.

A longer cycle time can be set in
continuous operation.

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Start self­adjustment
manually

Manually start the self-adjustment at the
defined point in time outside of the cycle time
by pushing the button.

5.3.2.2. Creating a new instrument file

It is possible to create an instrument file without restarting the P2A
software.

✓ Transmitter must be connected.

1. Click on File > New connection in the menu bar.

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- Connection to the transmitter is established.

5.3.2.3. Saving parameters

Parameters can be saved in new parameter files.

1. Mark instrument/parameter file.

2. Click on File > Save as in the menu bar.

3. Select storage location and enter the file name.

4. Click on [Save].

- The new parameter file is shown in the file list.
Only the parameters are saved from an instrument file; the history

data are not adopted.

55

5 Parameterizing, adjusting and analyzing software (P2A software)

The original name (Instrument type, Serial number) is
suggested with the current date/time as standard, e.g.
"testo 6781 01234578 061120 1403.cfp".

For a standard installation, the files are saved under
"C:\Documents and Settings\All Users\Shared
Documents\P2A Software". The path can differ depending

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on the version of the operating system.

5.3.2.4. Opening the parameter file

All parameter files stored in the standard directory path are
automatically displayed in the file list when the software is started.

You can also open parameter files that are stored in other
directories.

1. Click on File > Open in the menu bar.

2. Select the storage location and click on the requisite file.

3. Click on [Open].

- The selected file is opened. This can be changed and saved

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(see Editing instrument/parameter file page 48).

5.3.2.5. Copying and pasting parameters

The parameters of a parameter file can be transmitted to an
instrument file or another parameter file from the same instrument
type.

1. Select file from which parameters are to be copied.

2. Click on Edit > Copy in the menu bar.

3. Select the file which is to be modified.

4. Click on Edit > Paste in the menu bar.

- The parameters are transmitted to the file.
You can also use the common keyboard shortcuts for

copying (CTRL+C) and pasting (CTRL+V).
Parameters can also be transmitted using drag & drop,

where you drag the icon of the parameter file onto the icon
of the target instrument file.

5. Connect and select corresponding instrument.

6. Click on [Change parameterization].

7. Confirm confirmation request.

- Parameter data are transferred to the instrument.

56

5 Parameterizing, adjusting and analyzing software (P2A software)

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5.3.2.6. Deleting instrument/parameter file

Instrument/parameter files can be deleted from the file list.

1. Click on the file that is to be deleted with the right mouse button.

2. Select the command Delete in the context menu.

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5.3.3. Analyzing/testing the transmitter

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- The instrument or parameter file is deleted from the list.

In this section, you can test the outputs of the connected
instrument, read off the limit values and reset the parameters to the
factory settings.

The function is only available for instrument files.

5.3.3.1. Analyzing/testing the instrument

✓ The required instrument file is marked.

1. Click on [Test/analyze transmitter].

- The Properties of <Instrument type> <Serial number>
dialogue is opened with the Test/analyze transmitter register.

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2. Perform action:

Action Explanation

Carrying out factory
reset

Testing analog
output

Display min./max.
values

Reset the unit, limit value and hysteresis
parameters to factory settings (see below).

Test channel 1 (see Testing analog output
page 58).

Overview of the minimum and maximum
values measured since the last reset of the
transmitter (see Displaying min./max. values
page 59).

3. Click on [OK] or [Cancel] to close the dialogue.

5.3.3.2. Carrying out factory reset

✓ The required instrument file is marked.

1. Click on [Test/analyze transmitter].

- The Properties of <Instrument type> <Serial number>
dialogue is opened with the Test/analyze transmitter register.

2. Mark transmitter test.

57

5 Parameterizing, adjusting and analyzing software (P2A software)

- Current operating hours are shown.

3. Confirm control query to perform the reset.

- The values are reset to the customer-specific factory settings.

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4. Click on [OK] or [Cancel] to close the dialogue.

5.3.3.3. Testing analog output

✓ The required instrument file is marked.

1. Click on [Test/analyze transmitter].

- The Properties of <Instrument type> <Serial number>

dialogue is opened with the Test/analyze transmitter register.

2. Mark channel and test values.

Field/button Explanation

Check the analog outputs (see Testing
functionality of analog outputs page

32).

58

Current reading Readings are updated every second.
Unit

Unit according to the type of analog
output.

Default value

Freely definable output value for the
respective type of analog output (V or
mA), 1 decimal place.

5 Parameterizing, adjusting and analyzing software (P2A software)

Field/button Explanation

[Activate] The entered default value is forwarded

to the corresponding analog output
and to the test contacts by clicking.

A warning informs that the value is
being transmitted to the connected
instrument in the event of existing
cabling.

Now check the analog output using a
precise multimeter.

[Deactivate] Finish entering the electrical variables

at the analog output.
The analog output returns to the

current reading again.

3. Click on [OK] or [Cancel] to close the dialogue.

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- The analog output returns to Measuring Mode again.

5.3.3.4. Displaying min./max. values

The transmitter saves the minimum or maximum value for each
channel (measured since the last voltage supply or since the last
manual reset).

✓ The required instrument file is marked.

1. Click on [Test/analyze transmitter].

- The Properties of <Instrument type> <Serial number>
dialogue is opened with the Test/analyze transmitter register.

2. Mark Min./max. values.

Field/button Explanation

Min./max. values

View the min./max. values of each channel.
Only the values within the measuring range
are shown.

59

5 Parameterizing, adjusting and analyzing software (P2A software)

Field/button Explanation

Channel Channel 1 min./max.
Value Min. or max. value, 1 decimal place.
Unit

Unit selected in Unit/analog output.

3. Reset Min./max. values.

4. Click on [Reset min./max. values].

5. Confirm control query to perform the reset.

- The values are reset to the factory settings.

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6. Click on [OK] or [Cancel] to close the dialogue.

5.3.4. Adjusting the transmitter

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This function is used to adjust an attached instrument. The
following adjustments may be carried out using the software:

• 1-point adjustment (offset)

• Analog adjustment (entry via assistant/wizard)

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Also see Adjusting the instrument page 21

60

5 Parameterizing, adjusting and analyzing software (P2A software)

5.3.4.1. 1-point adjustment

A dew mirror hygrometer is recommended as the reference
measuring instrument for the 1-point adjustment (offset).

1. Expose the reference measuring instrument and the instrument
to be adjusted to the same constant conditions and wait for
equalization period to lapse.

2. Mark the instrument file of the connected instrument.

3. Click on [Adjusting the transmitter].

- The Properties of <Instrument type> <Serial number>
dialogue is opened with the Adjusting the transmitter register.

4. Enter reference value and click on [Carry out 1-point

adjustment].

5. Confirm confirmation request.

- The adjustment is carried out.

Field Explanation

°Ctd/°Ftd

Selection of the unit; only for dewpoint
adjustment.

°C/°F

Selection of the unit; only for temperature
adjustment.

Current reading Reading in the selected unit °Ctd/°Ftd or °C/°F.

Readings are updated every second.

61

5 Parameterizing, adjusting and analyzing software (P2A software)

Field Explanation

Reference value

Entry of the read-off value from the reference
measuring instrument.

Permissible entries:

• max. 10 °C

deviation (sum of all 1-point

td

adjustments)

• max. 2 K (°C) deviation (sum of all 1-point
adjustments)

> Click on [Set offset to zero] to reset a transmitted reference

value.

- The current reading is used again.

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6. Click on [OK] or [Cancel] to close the dialogue.

5.3.4.2. Adjusting the analog output

1. Connect precision multimeter (see Analog output adjustment
page 23).

2. Mark the instrument file of the connected instrument.

3. Click on [Adjusting the transmitter].

- The Properties of <Instrument type> <Serial number>
dialogue is opened with the Adjusting the transmitter register.

4. Click on [Start wizard …] and follow the instructions of the
wizard.

- The adjustment is performed when the wizard is closed.

62

5 Parameterizing, adjusting and analyzing software (P2A software)

Field Explanation

Default value

The analog output value from the last
performed adjustment is given at the output.
Value of the factory adjustment:

• Lower adjustment point: approx. 10 % of
the max. value

• Centre adjustment point: approx. 50 % of
the max. value

• Upper adjustment point: approx. 90 % of
the max. value

Measured analog
value

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5.3.5. Transmitter history

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Required field: Entry of the value read off at
the multimeter.

Parameterizations, adjustment processes and messages that have
occurred are registered in the transmitter with an operating hours
stamp.

In the history overviews (explained later in more detail), past
processes and events can be made visible.

63

5 Parameterizing, adjusting and analyzing software (P2A software)

For parameter changes or adjustments that are performed
directly at the instrument (via the user menu), "Transmitter"
is entered in the User field and only the operating hour is
entered in the Date/time field instead of operating
hour/date/time.

For entries that are performed using the P2A software, the
name of the user logged into Windows appears in the User
field, while the date/time and operating hour are shown in
the Date/time field.

1. Mark the instrument file of the connected instrument.

2. Click on the [Transmitter history] button.

- The Properties of <Instrument type> <Serial number>
dialogue is opened with the Transmitter history register.

3. Click on the required entry in the list to change the display.

Field Explanation

64

Operating hours /
date/time

User

Comments

Operating hour/time stamp at which the
change at the instrument was performed.

Name with which the user is logged into the
operating system.

"Transmitter" entry if the change was
performed at the instrument.

Type of parameter change, e.g. "Unit of
channel 1 from % RH to Ctpd".

5 Parameterizing, adjusting and analyzing software (P2A software)

Field Explanation

Selection of adjustment histories: 1-point adjustments / Analog

adjustments.

Operating hours /
date/time

User

Operating hour/time stamp at which the
change at the instrument was performed.

Name with which the user is logged into the
operating system.

"Transmitter" entry if the change was
performed at the instrument.

Reference value Value read off at reference instrument.
Unit Unit during the adjustment.
Actual value before

adjustment

1-point adjustment: Reading of the
transmitter. If no changes were performed,
no value is displayed.

Offset from

1-point adjustment: Value before the
adjustment.

Offset to

1-point adjustment: Value after the
adjustment.

Channel Analog adjustment: Channel 1.
Specification Analog adjustment: Actual value.
Reading Analog adjustment: Entered reference value.

65

5 Parameterizing, adjusting and analyzing software (P2A software)

Field Explanation

Offset

Analog adjustment: Deviation at time of
adjustment.

The table is shown only for error and status messages that were
generated in the transmitter and were transferred and saved there
via the connection to the P2A software.

Operating hours

Operating hour at which the message
appeared in the instrument.

Serial number

Serial number of the instrument to which the
message is assigned

Message

e.g. "Scaling changed". The scaling was
changed.

Type of message e.g. early warning, status message.

> To print out the history data, click on [Print].

The printing job is automatically sent to the default printer
for the operating system.

With [Set up printer …] a different printer can be selected
or the printout can be edited.

4. Click on [OK] or [Cancel] to close the dialogue.

66

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6 Tips and assistance

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6.1. Questions and answers

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Question Possible causes/solution

Connection to instrument

Check connection cable/plug contacts

cannot be established
Reading is too high or too

low

• There is still no equilibrium
condition in the system.

• Clean sensor or sintered cap, see
Maintenance and cleaning page 41

A message appears on the
display

Malfunction (with and
without display)

See Status, warning and error
messages page 37

Analysis using the P2A software, see
Analyzing/testing the transmitter page
57

Undo adjustment

A 1-point temperature/humidity
adjustment can be reset to the current
readings using [Set offset to zero]

The actual values before the
adjustment can be read out from the
corresponding history table.

If we could not answer your question, please contact your dealer or
Testo Customer Service. For contact details see the rear side of

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this document or the web page www.testo.com/service-contact

6 Tips and assistance

6.2. Accessories and spare parts

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Description Article no.
Measurement chamber and cooling coil

Precision measurement chamber up to

0554 3312

35,000 hPa with adjustable inflow
Cooling coil for process temperatures above

0554 3304
50 °C (up to 200 °C), only with measurement
chamber

Preliminary filter 0554 3311
Flow indicator 0554 3313

67

6 Tips and assistance

Description Article no.
Measurement chamber and cooling coil

Precision measurement chamber up to
35,000 hPa with adjustable inflow

Cooling coil for process temperatures above
50 °C (up to 200 °C), only with measurement
chamber

Preliminary filter 0554 3311
Flow indicator 0554 3313

Interface and software

P2A software (parameterizing, adjusting,
analyzing) incl. USB adapter

Plug-in connections

M12 plug-in connection (socket) for power
and signal lines

Supply
Mains unit (desktop, wall-mounted) 0554 1748
Mains unit (top-hat rail mounting) 0554 1749

Hose

PTFE tube with compressed air connections,
2 m, up to 140 °C and max. 9000 hPa

External display

Process display for testo 54-2 AC.... 5400 7553

Process display for testo 54-7 AC.... 5400 7555

Calibration
Standard ISO calibration certificate for

dewpoint
(-40 °C
selectable points

Standard DKD calibration certificate for
dewpoint at -10 °C

to 0 °Ctp at 6000 hPa), freely

tp

and -40 °Ctp

tp

0554 3312

0554 3304

0554 6020

0554 6689

0699 2824/4

0520 0116

0520 0136

68

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

6 Tips and assistance

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6.2.1. Ordering options for testo 6781 transmitter (0555

6781)

Order code Characteristic
Axx Process

connection

A01 Process connection G1/2
A02 Process connection NPT 1/2"

Bxx Analog
output/supply

B02 0 to 1 V (4-wire, 24 V AC/DC)
B03 0 to 5 V (4-wire, 24 V AC/DC)
B04 0 to 10 V (4-wire, 24 V AC/DC)
B05 0 to 20 mA (4-wire, 24 V AC/DC)
B06 4 to 20 mA (4-wire, 24 V AC/DC)

Cxx Display

C00 Without display
C02 With display/English
C03 With display/German
C04 With display/French
C05 With display/Spanish
C06 With display/Italian
C07 With display/Japanese
C08 With display/Swedish

Fxx Humidity variable

F01 °Ctd/Min/Max
F02 °Ftd/Min/Max
F03 % RH/Min/Max
F04 % RH/Min/Max
F05 °C
F06 °F
F07 ppm (vol)/Min/Max
F08 g/m3 /Min/Max

tdA

tdA

/Min/Max

/Min/Max

69

6 Tips and assistance

Order code Characteristic

F09 gr/ft3 /Min/Max
F10 g/kg /Min/Max
F11 gr/lb /Min/Max

Kxx Languages of
instruction manual

K01 German/English instruction manual
K02 French/English instruction manual
K03 Spanish/English instruction manual
K04 Italian/English instruction manual
K05 Dutch/English instruction manual
K06 Japanese/English instruction manual
K07 Chinese/English instruction manual
K08 Swedish/English instruction manual

Mxx Protection cap7

M01 Protection cap made of stainless steel
M03 Protection cap made of PTFE

C
=== Ende der Liste für Textmarke Inhalt ===

7

The accuracy is only maintained when the ordered protection cap is replaced

by the same type of protection cap in the event of heavy soiling.
70

0970 6781 en 01 V1.0 V01.40-1 en