TESTO 6740 Bedienungsanleitung

Andere Handbücher für 6740

1

Inhaltsverzeichnis

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Instruction manual en

testo 6740

Preface

2

Preface

Preface

Dear Testo Customer

Congratulations for choosing a Testo product. We hope that you will enjoy many years

of using the product and that it will help you in your work.

If problems should occur which you cannot rectify yourself, please consult our service

department or your dealer. We will endeavour to provide fast and competent assistance

to save you long periods out of operation.

General information 3

General information

This Instruction manual contains important information about the features and use of the

product. Please read this document through carefully and familiarise yourself with the

operation of the product before putting it to use. Keep the Instruction manual to hand so

that you can refer to it when necessary.

Pictograms

This product could be dangerous if operated incorrectly. Information that requires

particular attention is identified in this Instruction manual by pictograms:

Warnings are identified by means of a warning triangle. The relevant signal

word!

indicates the degree of risk:

Warning! means: Serious physical injury could occur if you do not take

the precautionary measures indicated.

Caution! means: Slight physical injury or material damage could occur if

you do not take the precautionary measures indicated.

Pay particular attention to warnings and take the precautionary measures

indicated in order to avoid danger.

Notes on special cases and peculiarities in the handling of the product are indicated

by an exclamation mark.

Standards/Approvals

According to the conformity certificate, this product fulfills all

2004/108/EEC guidelines.

Signal

word!

Contents

4

Contents

Preface ......................................................................2

General information ..................................................3

Contents....................................................................4

1. Basic safety information ............................................5

2. Intended use ............................................................6

3. Product description ..................................................7

3.1 System components ................................................7

3.2 Operating elements ..................................................7

3.3 Settings ..................................................................8

3.4 Current output intervals ............................................8

4. Initial operation ..........................................................9

4.1 Mechanical assembly ..............................................9

4.2 Electric connection ..............................................11

4.3 Analog output/Limit signal outputs ........................14

5. Menu guide (0555.6743 /0555.6744 only) ..............16

6. Adjustment on site ..................................................19

7. Care and maintenance ............................................23

8. Troubleshooting ......................................................24

9. Technical data ........................................................25

9.1 Measurement ranges and accuracies ....................25

9.2 Additional instrument data ....................................25

9.3 Uncertainty pressure dewpoint temperature............26

10. Accessories /Spare parts ........................................27

1. Basic safety information 5

1. Basic safety information

Avoid electrical hazards:

Never take measurements with the instrument and its probes on or near live

components unless the instrument is expressly approved for current and voltage

measurements.

Protect the instrument:

Never store the unit together with solvents (e.g. acetone).

Preserving product safety/warranty entitlement:

Operate the instrument only within the parameters specified in the Technical data.

Handle the instrument appropriately and according to its intended purpose.

Never apply force!

Temperature data on sensors/probes refer only to the measurement range of the

sensors. Do not subject handles and lines to temperatures greater than 70°C if they

are not expressly approved for higher temperatures.

Open the instrument for maintenance and repair purposes only if specifically

described in the Instruction Manual.

Maintenance work should only be carried out if described in the Instruction Manual.

Please adhere to the steps described. For safety reasons, please only use spare

parts from Testo.

Any additional work should only be carried out by authorised trained personnel.

Otherwise Testo does not accept responsibility for the functioning of the instrument

following maintenance and for the validity of approvals.

Dispose of carefully:

Once its service life has come to an end, return the instrument to us and we will

dispose of it.

2. Intended use

6

2. Intended use

The instrument is intended for use in the following applications:

The testo 6740 instrument is a pressure dew point transmitter for measuring trace

humidity. It is used in the following areas:

- Monitoring trace humidity in compressed air systems and gas networks

(e.g. pipeline and container drying).

- Controlling and monitoring (compressed air) driers.

- Monitoring compressed air humidity in vehicles.

- Monitoring humidity and temperature in medical compressed air or

granulate driers.

Application in hazardons areas is not allowed!

3. Product description

3.1 System components 7

3. Product description

3.1 System components

To

process

Cooling

coil 1

0554.3304

Measurement

chamber 22

0554.3303

G½, without display

0555.6741

NPT½“, without display

0555.6742

G½, with display

0555.6743

NPT½“, with display

0555.6744

Standard plug, 4 to 20mA

(included with all instruments)

Accessories:

0554.3302 plug (4 to 20mA,

2 switch contacts, 2 LEDs)

1Only required for process

temperatures > 50°C, cooling coil

only in connection with measurement

chamber

2Measurement chamber only required

if

- incoming flow is to be increased

(measurement chamber guarantees

a minimum incoming flow of 1l/min

at a positive pressure of 6bar).

- fast assembly/dismantling of

transmitter without interrupting

process is required.

To

PLC/control/

analysis unit

3.2 Operating elements

The instruments with the article numbers 0555.6741

and 0555.6742 do not have any additional operating

elements.

The instruments with the article numbers 0555.6743

and 0555.6744 have a keypad and a display to input

and read off settings (See 5. Menu guide, p. 16).

All of the instruments of Type testo 6740 can be

parameterised with the aid of the 0554.3305 scaling

adapter.

Standard quick-release device

G½ thread



Max. pressure: 15barabs

Max. pressure: 50barabs

3.3 Settings

The parameters in the instrument are assigned the

following values in the factory (default values):

3. Product description

3.3 Settings

8

Parameter Pressure dew point 1Atmospheric dew point 1Relative humidity Temperature Absolute humidity

Unit °Ctp °Ftp °CtA °FtA %rF, %rh, %Hr °C °F ppmvmg/m3(Abs)

4mA -60 -75 -60 -75 003200

20mA 30 85 30 85 100 50 120 30000 230000 2

LS 4 40 4 40 30 10 50 8400 7000

US 10 55 10 55 50 30 85 13000 9600

Hyst 2 2 2 2 2 2 2 2 2

1With dew point temperatures <0°Ctp / <0°CtA/ <32°Ftp /<32°FtA the frostpoint temperature (dewpoint upon ice)

is displayed

2Display is shown to the power of ten: 30E3 (corresponds to 30 x 103= 30 x 1000 = 30000)

3.4 Current output intervals

Failure information A Measurement information M Failure information A

4. Initial operation

4.1 Mechanical assembly 9

4.1 Mechanical assembly

We recommend you wrap the thread of the process

connection in sealing tape (e.g. PTFE) or place it in a

copper gasket (inner diameter: 21mm).

Force should only be applied to the Allen screw .

There are 3 different options for assembly depending

on the application:

Without measurement chamber and cooling coil

Compressed air!

Risk of injury!

Depressurise pipe sections (e.g. compressor

off or use bypass) and aerate before opening.

1Screw process connection (G½ or NPT½“) into the

matching thread.

The housing can be rotated by 350°. Do not use force

when aligning.

2Set up housing so that the display can be easily

read. Tighten grub screw .

3Complete aeration of pipe section and apply

pressure to pipe section.

4. Initial operation

Assembly Application

Without measurement chamber - Process temperatures 0 to 50°C

and cooling coil - It is possible to attach sensor directly in process

- No quick assembly/dismantling of testo 6740 required and

flow on sensor is sufficient (1l/min)

With measurement chamber - Process temperatures 0 to 50°C

- Fast assembly/dismantling of testo 6740 required and/or

flow on sensor is insufficient (1l/min)

With measurement chamber - Process temperatures 50 to 200°C

and cooling coil

Warning





4. Initial operation

4.1 Mechanical assembly

10

With measurement chamber (max. 15bar)

1Connect measurement chamber without measure-

ment transmitter to the compressed air push-in

quick connection for approx. 10 - 30 s, in order to

blow out any dirt deposits

2Remove measurement chamber from compressed

air push-in quick connection.

3Screw in process connection (G½) of the

testo 6741/6743 transmitter in measurement

chamber thread.

4Snap push-in quick connection of measurement

chamber in standard socket of compressed air line.

With measurement chamber and cooling coil

(max. 15bar)

1Connect measurement chamber without measure-

ment transmitter to the compressed air push-in

quick connection for approx. 10 - 30 s, in order to

blow out any dirt deposits

2Remove measurement chamber from compressed

air push-in quick connection.

3Screw in process connection (G½) of testo 6741/

6743 transmitter into thread of measurement

chamber.

4Snap push-in quick connection of measurement

chamber in push-in quick connection of the cooling

coil.

5Snap second push-in quick connection of the

cooling coil into the standard socket of the

compressed air line.