TESTO 6681 Profibus Instruction Manual

testo 6681 Profibus · Humidity transmitte

r

with Profibus module

testo 6610 · Probes

P2A software · Parameterizing, adjusting and analyzing

software

Instruction manual Volume 1 en

Safety and the environment

3

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 to the

opening and repair of electrical equipment.

Avoiding personal injury/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 temperatures.

Never store or operate the product with solvents and 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 force.

Carry out only the maintenance and repair work that is described in the

documentation. Follow the prescribed steps when doing so. Use only
OEM spare parts from Testo.

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

Send the product back to Testo at the end of its useful life. We will ensure

that it is disposed of in an environmentally friendly manner.

4

About this document

About this document

Please read this documentation through carefully and familiarize yourself with

the product before putting it to use. 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.

The following conventions are followed in this document:

Character/
display:

Explanation/example

With the signal word Warning!:

Warns against hazards which could result in serious physical
injury if the precautionary measures indicated are not taken,
e.g.:

De-energize the mains connection before connecting the
transmitter!

With the signal word Caution!:

Warns against hazards which could result in minor physical
injury or damage to equipment if the precautionary
measures indicated are not taken, e.g.:

Observe the permissible operating temperature!

Important information, e.g.:

Administrator rights are required to install the program under
Windows

®

2000, XP and Vista.



Aim of action, e.g.:

 Assembling the instrument at the process

connection:



Requirement that must be met, e.g.:

 USB drivers are installed.

About this document

5

Character/
display:

Explanation/example

1

Steps are numbered if a certain sequence of actions must
be followed, e.g.:

1 Loosen and remove housing screws.
2 Remove the upper part of housing.



A step is not numbered if there are no further steps or if the
step is optional, e.g.:

Insert probe connector into socket of testo 6681 until it

engages.

" to "

Example entries are in inverted commas, e.g.:

The value "0" results in ....

Bold type

Elements of the program interface or instrument display,
e.g.:

The instrument designation appears in the
instrument/parameter file list.

Select Main Menu Channel 1 and confirm with SET.

…>…

Functions/paths within a menu, e.g.:

Start > All Programmes > Testo > P2A Software.

[ ]

Buttons which start an action, e.g.:

Confirm the software key with [OK].

CAPITAL
LETTERS

Keys on the instrument or keypad, e.g.:

Press ESC.

6

Contents

Contents

1 TRANSMITTER ............................................................................................ 9

1.1 Specifications ........................................................................................... 9

1.1.1 Functions and use ...................................................................... 9

1.1.2 Scope of delivery ........................................................................ 9

1.1.3 Accessories............................................................................... 10

1.1.4 Technical Data .......................................................................... 10

1.1.5 Dimensions ............................................................................... 12

1.2 Product description ................................................................................ 13

1.2.1 At a glance ................................................................................ 13

1.2.2 Usable probes ........................................................................... 14

1.2.3 Display and keypad .................................................................. 15

1.2.4 Service interface ....................................................................... 15

1.2.5 Relay board (option) ................................................................. 15

1.2.6 Analog outputs .......................................................................... 16

1.2.7 Parameters ............................................................................... 16

1.2.8 Scaling ...................................................................................... 17

1.2.9 Alarm handling .......................................................................... 19

1.3 Commissioning ...................................................................................... 20

1.3.1 Insert Profibus module (Order no. 0554 6686) ......................... 20

1.3.2 Assembling the instrument ....................................................... 22

1.3.3 Connecting the instrument ........................................................ 25

1.3.4 Connect instrument to the bus system ..................................... 42

1.3.5 Configure Profibus module using EDD ..................................... 49

1.3.6 Adjusting the instrument ........................................................... 55

1.4 Operation ............................................................................................... 66

1.4.1 Relationship between user menu and mini-DIN socket is

active ......................................................................................... 66

1.4.2 Key cover .................................................................................. 67

1.4.3 Password protection ................................................................. 68

1.4.4 Structure of user menu ............................................................. 69

1.4.5 Overview of the testo 6681 user menu ........................................... 70

1.4.6 The individual main menus ....................................................... 72

Contents

7

1.5 Status, warning and error messages ..................................................... 84

1.5.1 Status messages ...................................................................... 84

1.5.2 Warning messages ................................................................... 85

1.5.3 Transmitter error messages ...................................................... 87

1.5.4 Status codes in cyclical service ................................................ 88

1.5.5 Handling alarm messages ........................................................ 88

1.5.6 Namur fault conditions .............................................................. 90

1.6 Maintenance and cleaning ..................................................................... 91

1.6.1 Maintaining the instrument ........................................................ 91

1.6.2 Cleaning the instrument ............................................................ 91

8

Certificate

testo 6681 Profibus - 1.1 Specifications

9

1 Transmitter

1.1 Specifications

1.1.1 Functions and use

The testo 6681 humidity transmitter with Profibus module is used in
conjunction with plug-in, adjusted probes from the testo 6610 range.

Please refer to volume 2, chapter 2, page 97 for information
about commissioning, operating and maintaining the
testo 6610 probe.

The testo 6681 humidity transmitter is suitable for the following applications
with Profibus networking, for example:

Process instrumentation
Clean rooms
Test benches
Drying processes
Production and storage air quality
Complex room climate applications.

1.1.2 Scope of delivery

The scope of delivery of the testo 6681 humidity transmitter includes the
following:

Key cover
Rear panel bracket

10

testo 6681 Profibus - 1.1 Specifications

1.1.3 Accessories

The following accessories are available for the testo 6681 humidity
transmitter:

Protection caps for probes
Mains unit
P2A software (parameterizing, adjusting and analyzing software)
Assembly accessories.

Information about accessories and their order numbers can
be found in volume 2, chapter 4.2, page 167 or on the
website at www.testo.com.

1.1.4 Technical Data

Parameters

Humidity (various variables and units)
Temperature (°C/°F)

Measuring range

Depends on probe

Accuracy

Depends on probe

Resolution

0.1 % RH or 0.1 °C/0.1 °F

Meas. cycle

1/s

Interface

Mini-DIN for P2A software

(parameterizing and adjusting
software) and handheld testo
400/650

Optional Profibus-DP module

Voltage supply

4-wire (separate signal and supply

lines):
20 - 30 V AC/DC,
300 mA power consumption

Maximum load

- 4-wire: 500  (power output)

Analogue 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

Relay

4 relays, 250 V AC/DC, 3 A (optional)

testo 6681 Profibus - 1.1 Specifications

11

Display

2-line LCD with plain text line

(optional)

Housing operating temperature

-40 to +70 °C/-40 to +158 °F, with display
from 0 to 50 °C/+32 to +122 °F

With integrated relay: -40 - +60 °C

Storage temperature

- 40 to 80 °C/-40 to +176 °F

Housing, weight

Metal: 1.960 kg
Profibus: 0.610 kg

Protection class

IP 65 only if the transmitter is wired

and/or seal plugs are inserted

Directives, standards and tests

EC Directive: 2004/108/EC

Warranty

Duration: 2 years
Warranty conditions: See web page

www.testo.com/warranty

12

testo 6681 Profibus - 1.1 Specifications

1.1.5 Dimensions

Dimensions in mm a b

With M 20 cable couplings 144 147

With NPT cable couplings 144 144

With M plug-in connections 143

testo 6681 Profibus - 1.2 Product description

13

1.2 Product description

1.2.1 At a glance

1 Keys (with optional display)
2 Service flap screw

connection (self-locking,

2x)
3 Display (optional)
4 Service flap
5 M 16 x 1.5 screw

connection*, e.g. analog

outputs
6 M 16 x 1.5 screw

connection*, e.g. voltage

supply
7 Eyelet for measuring point

panel
8 M 20 x 1.5 screw

connection*, e.g. relay R 3

and R 4
9 Earthing/PE connection
10 M 20 x 1.5 screw

connection*, e.g. relay R 1

and R 2
11 Probe connector

(testo 6610)
12 Upper part of housing

* Alternatively, NPT cable

couplings or M plug-in
connections are available

A

Profibus module

13 Rotary encoder switch for

addressing
14 Profibus M12 socket
15 Profibus M12 connector
16 LED: Bus error
17 LED: System error
18 LED: Supply

14

testo 6681 Profibus - 1.2 Product description

19 Housing screws (4x)
20 Socket for probe connector
21 Hole for fastening to rear

panel bracket (M3 x 6
screw)

22 Plastic bracket for assembly

on rear panel

22

21

1.2.2 Usable probes

The testo 6681 humidity transmitter can be used with the following probes:

Probe Article no. Characteristic

testo 6611 0555 6610-L11 Wall probe version; accuracy to ± 1 % RH;

temperature range -20 °C to +70 °C/-4 to +158 °F,
sensor plugged

testo 6612 0555 6610-L12 Duct probe version; accuracy to ± 1 % RH;

temperature range -30 °C to 150 °C/-22 to +302 °F,
sensor soldered/optionally plugged

testo 6613 0555 6610-L13 Cable probe version; accuracy to ± 1 % RH;

temperature range -70 °C to +180 °C/-94 to
+356 °F, sensor soldered/optionally plugged

testo 6614 0555 6610-L14 Heated cable probe version; accuracy to ± 1.0 %

RH; temperature range -40 °C to +180 °C/

-40 to +356 °F, sensor soldered

testo 6681 Profibus - 1.2 Product description

15

Probe Article no. Characteristic

testo 6615 0555 6610-L15 Trace humidity cable probe version;

accuracy ± 6 K at -60 °Ctd;
temperature range -40 °C to +120 °C/-40 to
+248 °F, sensor soldered

testo 6617 0555 6610-L17 Cable with cover electrode monitoring probe

version; accuracy to ± 1.2 % RH; temperature range

-40 °C to +180 °C/-40 to +356 °F, sensor soldered

1.2.3 Display and keypad

The display option allows the testo 6681 humidity transmitter to be operated
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.

1.2.4 Service interface

Behind the service flap is the parameterizing socket (mini-DIN) as an
interface to the P2A software or Testo handheld instrument
(testo 400/testo 650).

1.2.5 Relay board (option)

This has a floating switch capacity of 250 V AC/3 A. The switching limits and
hysteresis can be set via the display or the P2A software or via the Profibus.
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, settings 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.

16

testo 6681 Profibus - 1.2 Product description

1.2.6 Analog outputs

For analog outputs, the testo 6681 has either

2 or optionally 3 current outputs of 4 to 20 mA/0 to 20 mA (4-wire) or
2 or optionally 3 voltage outputs of 0 to 1 V/0 to 5 V/0 to 10 V (4-wire).

The transmitter can be ordered with a third analog output as an option.

If the Profibus module is integrated directly into the
testo 6681 humidity transmitter (order code B77), it has two
current outputs 4 ...20 mA.

1.2.7 Parameters

The following parameters are displayed:

 Relative humidity in %RH (technical)
 Relative humidity in % WMO* (calculation according to the WMO

standard)

 Temperature °C and °F
 Dewpoint in °Ctd and °Ftd
 Absolute humidity in g/m³ and gr/ft³
 Degree of humidity in g/kg and gr/lb
 Enthalpy in kJ/kg and BTU/lb
 Psychrometer temperature in °Ctw and °Ftw
 Water vapour partial pressure in hPa and "H

2

O (inch H2O)

 Water content in ppm

vol

and % vol

 Dewpoint of H

2O2

mixture in °Ctm and °Ftm

 Mixture humidity H

2O2

in %RHm

*It is possible that condensation appears as of a displayed humidity
starting from 70 % and is shown on the display. This unit is used in
meteorology, for example. According to the WMO, the Magnus
coefficient is used for sub-cooled water in the calculation of relative
humidity.

Calculated humidity variables correspond to the medium of
air. With other gases/gas compositions, deviations may
occur, e.g. with the enthalpy

testo 6681 Profibus - 1.2 Product description

17

1.2.8 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. Refer
to table (see below) for the measuring range.

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.

Refer to table (see below) for the measuring range.

3 The maximum settings for the manual scaling

- the values are not expressly given in the table. 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.
However, the physical measurement range limits are the deciding
factor when defining alarms.

18

testo 6681 Profibus - 1.2 Product description

Parameter Unit Probe

Measuring

range

Physical

at 1013 hPa

Standard

scaling

MUF

measuring

range

MIN MAX MIN MAX

Temperature °C 6611 -20

+70

-20 +70

°F 6611 -4 +158

-4

+158

°C 6612 -30 +150

-30 +150

°F 6612 -22 +302

-22 +302

°C 6613 -70 +180

-70 +180

°F 6613 -94 +356

-94 +356

°C 6614, 6617 -40 +180

-40 +180

°F 6614, 6617 -40 +356

-40 +356

°C 6615 -40 +120

-40 +120

°F 6615 -40 +248

-40 +248

relative humidity % RH 0 +100

0

+100

WMO relative humidity % RH 0 +100

0

+100

Mixture humidity H2O2 % RHm 0 100

0

100

Dewpoint °Ctd 6611 -20

+70

-80 +100

°Ftd 6611 -4 +158 -112 +212

°Ctd

6612, 6613, 6614,
6617

-20

+100

-80 +100

°Ftd

6612, 6613, 6614,
6617

-112 +212 -112 +212

°Ctd 6615 -60

+30

-80 +100

°Ftd 6615 -148 +212 -112 +212

Mixture dewpoint (H2O2) °Ctm -20 +100

-20 +100

°Ftm -4 +212

-4

+212

Absolute humidity g/m3 all probes 0

600

0

2000

gr/ft3 0

250

0

800

Degree of humidity g/kg all probes 0 13300

0

9500

gr/lb 0 93000

0

66500

Enthalpy kJ/kg -40 99999

-40 8000

BTU/lb -18 43000

-18 3500

Psychrometer temperature °Ctw -40

100

-40 180

°Ftw -58

210

-40 356

testo 6681 Profibus - 1.2 Product description

19

Parameter Unit Probe

Measuring

range

Physical

at 1013 hPa

Standard

scaling

MUF

measuring

range

MIN MAX MIN MAX

Water content

ppm vol
H2O 0 99999

0

99999

% vol 0

100

0

100

Water vapour partial pressure hPa 0 1000

0

7000

inchH2O 0

400

0

2800

1.2.9 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 6681 monitors limit values using 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 chapter 1.5, Status,
warning and error messages, page 84.

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.

Example:

If the condensation of the probe begins, the "Condensation"
message appears on the display and the "Start" status
display. If the condensation is over, the status display
changes from "Start" to "End".

20

testo 6681 Profibus - 1.3 Commissioning

1.3 Commissioning

1.3.1 Insert Profibus module (Order no.
0554 6686)

The Profibus module can be ordered retroactively as an accessory. It can
easily be installed in the testo 6681 humidity transmitter.

 The probe connector must be disconnected.

4 Loosen screw connection (1) of service flap and open the flap.

5 Loosen and remove housing screws (2).

6 Remove upper part of housing (3) and place on a clean surface.

testo 6681 Profibus - 1.3 Commissioning

21

7 Place Profibus module (A) on lower part of instrument (4).

If necessary, manually set the address using the rotary
encoder switches (see chapter 1.3.3.6, page 37 before fixing
the instrument in place.

8 Set on upper part of instrument (5) and fix in place using housing screws

(2).

22

testo 6681 Profibus - 1.3 Commissioning

1.3.2 Assembling the instrument

1.3.2.1 Wall mounting

(for testo 6611/6613/6614/6615/6617 probes)

 Attaching rear panel bracket

1 Remove locking screw (item (4) of drawing on page 21) and detach rear

panel bracket from plastic bracket (item (2) of drawing on page 21).

2 Hold rear panel bracket in assembly position and mark the three drill

holes.

3 Drill three holes ( 5 mm) and insert dowels where necessary.

4 Screw on rear panel bracket.

Remember that the clamping brackets (1) must face the wall.

testo 6681 Profibus - 1.3 Commissioning

23

 Fastening instrument to rear panel bracket

2

3

4

5

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.

3 Insert probe connector (5) into socket until it engages.

24

testo 6681 Profibus - 1.3 Commissioning

1.3.2.2 Duct mounting (for testo 6612 probes)

3

10

5

1

4

11

2

6

9

12

7

8

1 Hold wall/duct bracket (order no. 0554 6651) (6) against duct wall (8) and

mark drill holes for wall/duct bracket and probe shaft.

2 Drill a hole ( 12,5 mm) in the duct wall to feed through the probe shaft.

3 Fasten wall/duct bracket (6) to duct wall with screws (5).

4 Push probe shaft (9) with filter (10) through the middle hole of the

mounting bracket.

The wall/duct bracket (6) has an O-ring (7) to seal it against
the duct. Feed the probe shaft (9) carefully through the
wall/duct bracket so that the O-ring is not damaged.

5 Fix the correct position of the probe shaft (9) with screw (11) and mark

(insert probe shaft as far as possible).

testo 6681 Profibus - 1.3 Commissioning

25

6 Slide plastic bracket (2) on the back of the transmitter onto bracket (3, 4)

until it engages.

Take the weight of the transmitter into account. Ensure that
the brackets (4, 6) are fastened securely.

7 Insert screw (1) through hole on the top of the instrument and screw into

bracket (3).

8 Insert probe connector (12) into socket until it engages.

1.3.3 Connecting the instrument

 Opening the instrument

1 Loosen screw connection (1) of service flap and open the flap.

26

testo 6681 Profibus - 1.3 Commissioning

2 Loosen and remove housing screws (2).

Important.

The Profibus module (A) is already separated from the upper
and lower parts of the instrument when the housing screws

(2) are removed.

3 Remove upper part of housing (3) and place on a clean surface.

4 Remove Profibus module (A) from lower part of housing (4) and also

place on a clean surface.

testo 6681 Profibus - 1.3 Commissioning

27

Warning!

Electrical voltage.

Danger of short-circuit!
De-energize the mains connection before connecting the
transmitter!

Only have the transmitter wired and connected by authorized
personnel with the voltage disconnected.

28

testo 6681 Profibus - 1.3 Commissioning

1.3.3.1 Overview of terminals

1 Lower part of housing
2 Relay board (option)
3 Relay terminals
4 Insulating trough for relay

board

5 Terminal strip for voltage

supply and analog outputs*

* The transmitter testo 6681 with

integrated Profibus module (order
code B 77) has two current
outputs 4 to 20 mA.

6 Terminal board

7 Earthing terminal (internal)
8 M 16 x 1.5 screw

connection**
9 Earthing terminal (external)
10 M 20 x 1.5 screw

connection*
11 Eyelet for measuring point

panel

** Alternatively, NPT cable coupling

or M plug-in connection.

The following description of the terminals refers to this
overview and its numbering.