WIKA GDT-20 Manual de usuario

Operating instructions

Betriebsanleitung

Messumformer, Typen GDT-20, GDHT-20

Model GDT-20 Model GDHT-20

Transmitter, models GDT-20, GDHT-20

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WIKA operating instructions transmitter, models GDT20, GDHT20

WIKA®is a registered trademark in various countries.

WIKA®ist eine geschützte Marke in verschiedenen Ländern.

Prior to starting any work, read the operating instructions!

Keep for later use!

Vor Beginn aller Arbeiten Betriebsanleitung lesen!

Zum späteren Gebrauch aufbewahren!

Transmitter, models GDT-20, GDHT-20 Page 3 - 26

Messumformer, Typen GDT-20, GDHT-20 Seite 27 - 48

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WIKA operating instructions transmitter, models GDT-20, GDHT-20

Contents

1. General information 4

2. Safety 5

3. Specications 8

4. Design and function 9

5. Transport, packaging and storage 9

6. Commissioning, operation 10

7. Maintenance and cleaning 22

8. Faults 23

9. Dismounting, return and disposal 23

Appendix 1: Accuracy of the dew point 25

Declarations of conformity can be found online at www.wika.com

4WIKA operating instructions transmitter, models GDT-20, GDHT-20

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1. General information

■

The transmitter described in the operating instructions has been designed and manufac-

tured using state-of-the-art technology. All components are subject to stringent quality

and environmental criteria during production. Our management systems are certied to

ISO 9001 and ISO 14001.

■

These operating instructions contain important information on handling the instrument.

Working safely requires that all safety instructions and work instructions are observed.

■

Observe the relevant local accident prevention regulations and general safety regulations

for the instrument's range of use.

■

The operating instructions are part of the product and must be kept in the immediate

vicinity of the instrument and readily accessible to skilled personnel at any time.

■

Skilled personnel must have carefully read and understood the operating instructions prior

to beginning any work.

■

The manufacturer's liability is void in the case of any damage caused by using the product

contrary to its intended use, non-compliance with these operating instructions, assignment

of insuciently qualied skilled personnel or unauthorised modications to the instrument.

■

The general terms and conditions contained in the sales documentation shall apply.

■

Subject to technical modications.

■

Further information:

- Internet address: www.wika.de / www.wika.com

- Corresponding data sheets: SP 60.09 (model GDT-20), SP 60.14 (model GDHT-20)

- Application consultant: Tel.: +49 9372 132-8971

Fax: +49 9372 132-8008971

[email protected]

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WIKA operating instructions transmitter, models GDT-20, GDHT-20

1. General information / 2. Safety

Explanation of symbols

WARNING!

... indicates a potentially dangerous situation that can result in serious injury or

death, if not avoided.

CAUTION!

... indicates a potentially dangerous situation that can result in light injuries or

damage to equipment or the environment, if not avoided.

Information

... points out useful tips, recommendations and information for ecient and

trouble-free operation.

2. Safety

WARNING!

Before installation, commissioning and operation, ensure that the appropriate

transmitter in terms of measuring range, design and specic measuring condi-

tions, has been selected.

Non-observance can result in serious injury and/or damage to the equipment.

Further important safety instructions can be found in the individual chapters of

these operating instructions.

2.1 Intended use

These transmitters are designed for use at SF6 gas-lled systems. There, the state variables

pressure, temperature and humidity (only model GDHT-20) are measured permanently. From

these, the transmitter calculates the values gas density and dew point/frost point (only model

GDHT-20) information of the SF6gas in order to evaluate the state of the system. All stated

parameters can be read from the Modbusprotocol via the RS-485 interface.The model

GDT-20 or GDHT-20 transmitters are therefore used for permanently monitoring the stated

status parameters in SF6gas tanks.

The instrument has been designed and built solely for the intended use described here, and

may only be used accordingly.

The technical specications contained in these operating instructions must be observed.

Improper handling or operation of the instrument outside of its technical specications

requires the instrument to be taken out of service immediately and inspected by an authorised

WIKA service engineer.

The manufacturer shall not be liable for claims of any type based on operation contrary to the

intended use.

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2. Safety

2.2 Personnelqualication

WARNING!

Riskofinjuryshouldqualicationbeinsucient!

Improper handling can result in considerable injury and damage to equipment.

■

The activities described in these operating instructions may only be carried

out by skilled personnel who have the qualications described below.

■

Keep unqualied personnel away from hazardous areas.

Skilled personnel

Skilled personnel are understood to be personnel who, based on their technical training,

knowledge of measurement and control technology and on their experience and knowledge of

country-specic regulations, current standards and directives, are capable of carrying out the

work described and independently recognising potential hazards.

Special operating conditions require further appropriate knowledge, i.e. of aggressive media.

2.3 Safety instructions for use in switchgear

WARNING!

Residual media in the dismounted transmitter can result in a risk to persons, the

environment and equipment.

Take sucient precautionary measures.

Aggressive media may be present should a failure occur.

The plant operator must ensure that the handling of SF6 gas is only carried out by a qualied

company or by qualied persons which have been specially trained in accordance with

IEC 61634, section 4.3.1 or IEC 60480, section 10.3.1.

Valid standards and guidelines for SF6gas

Installation, assembly, commissioning:

■

BGI 753 (SF6plant and equipment in Germany)

■

IEC 61634 (Handling of SF6gas)

■

IEC 60376 (new SF6gas, technical SF6gas)

■

IEC 60480 (used SF6gas)

■

CIGRE report 276, 2005 (Practical SF6gas handling instructions)

Leaks during operation:

■

IEC 60376 (new SF6gas, technical SF6gas)

■

IEC 60480 (used SF6gas)

■

CIGRE 2002 (“SF6gas in the electrical industry”)

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WIKA operating instructions transmitter, models GDT-20, GDHT-20

2. Safety

Repair work and maintenance:

■

IEC 61634 (Use and handling of SF6gas in high-voltage switchgear and control gear)

■

CIGRE 1991 (Handling of the SF6gas)

■

CIGRE report 276, 2005 (Practical SF6gas handling instructions)

■

CIGRE report 163, 2000 (Guide for SF6gas mixtures)

SF6 is a colourless and odourless, chemically neutral, inert and not inammable gas which is

approx. ve times heavier than air, not toxic and not harmful to the ozone layer.

Detailed information is given in IEC 60376 and IEC 61634.

2.4 Labelling, safety marks

Product label GDT-20

Product label GDHT-20

Explanation of symbols

Before mounting and commissioning the instrument, ensure you read the

operating instructions!

GDT-20

Pressure: 0 ... 16 bar abs

Temp.: -40 °C ... +80 °C

Density: 0 ... 60 g/l

MODBUS RTU

17 ... 30 VDC, Pmax. = 3 W

Made in Germany www.wika.com

Pin Description

1 C RS-485 GND

2 UB17-30 VDC

3 GND Ground

4 A RS-485

5 B RS-485

13C

P# article number

S# serial number

Measuring range pressure

Measuring range temperature

Measuring range density

Communication protocol

Power supply

Pin assignment

GDHT-20

Pressure: 0 ... 16 bar abs

Temp.: -40 °C ... +80 °C

Density: 0 ... 60 g/l

Dew point: -60 °C ... +20 °C

MODBUS RTU

17 ... 30 VDC, Pmax. = 3 W

Made in Germany www.wika.com

Pin Description

1 C RS-485 GND

2 UB17-30 VDC

3 GND Ground

4 A RS-485

5 B RS-485

13C

P# article number

S# serial number

Measuring range pressure

Measuring range temperature

Measuring range density

Measuring range dew point

Communication protocol

Power supply

Pin assignment

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3.Specications

3. Specications

Measuring ranges

Dew point at ambient pressure: -50 ... +30 °C (GDHT-20 only)

Density 1):0 ... 60 g/litre (8.87 bar abs. SF₆ gas at 20 °C)

Temperature: -40 ... +80 °C

Pressure at 20 °C: 0 ... 8.87 bar abs. SF₆ gas

Pressure: 0 ... 16 bar abs.

Burst pressure: 52 bar abs.

Overpressure limit: up to 30 bar abs.

Pressure reference: Absolute

1) The pressure conditions are congured during the calculation of the gas mixture.

Permissible temperature ranges

Operating temperature: -40 ... +80 °C, -40 ... +176 °F

Storage temperature: -40 ... +80 °C, -40 ... +176 °F

Permissible humidity

≤ 90 % r. h. (non-condensing)

Voltage supply UB+

DC 17 ... 30 V

Power consumption

GDT-20: max. 0.5 W

GDHT-20: max. 3 W

Electrical connection

Circular connector M12 x 1 (5-pin)

ModbusRTU via RS-485 interface

Ingress protection

IP 65, only when plugged in and using mating connectors with the corresponding ingress

protection

Weight

approx. 0.40 kg

EMC directive

2004/108/EC, EN 61326 emission (group 1, class B) and interference immunity (industrial

application)

EMC tests

■

Interference immunity per IEC 61000-4-3: 30 V/m (80 MHz ... 2.7 GHz)

■

Burst per IEC 61000-4-4: 4 kV

■

ESD per IEC 61000-4-2: 8 kV/15 kV, contact/air

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WIKA operating instructions transmitter, models GDT-20, GDHT-20

3. ... / 4. Design and function / 5. Transport, packaging and ...

■

Impulse voltages per IEC 61000-4-5:

GDT-20: 2 kV conductor to ground, 1 kV conductor to conductor

GDT-20: 1 kV conductor to ground, 1 kV conductor to conductor

■

High-frequency elds per IEC 61000-4-6:

GDT-20: 10 V

GDHT-20: 3 V

For special model numbers, please note the specications stated on the delivery note.

For further specications see WIKA data sheet SP 60.09 (GDT-20), SP 60.14 (GDHT-20) and

the order documentation.

4. Design and function

4.1 Code designation

The described transmitters are equipped with sensors for pressure, temperature and

humidity (only GDHT-20). From this, the integrated microprocessor electronics calculate the

status parameters of SF6gas for gas density and humidity (only GDHT-20) with the help of

algorithms.

4.2 Scope of delivery

Cross-check scope of delivery with delivery note.

5. Transport, packaging and storage

5.1 Transport

Check the transmitter for any damage that may have been caused by transport.

Obvious damage must be reported immediately.

5.2 Packaging

Do not remove packaging until just before mounting.

Keep the packaging as it will provide optimum protection during transport (e.g. change in

installation site, sending for repair).

5.3 Storage

Permissible conditions at the place of storage:

■

Storage temperature: -40 ... +80 °C

■

Humidity: 90 % r. h. (no condensation)

10 WIKA operating instructions transmitter, models GDT-20, GDHT-20

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5. Transport, ... / 6. Commissioning, operation

Avoid exposure to the following factors:

■

Direct sunlight or proximity to hot objects

■

Mechanical vibration, mechanical shock (putting it down hard)

■

Soot, vapour, dust and corrosive gases

■

Potentially explosive environments, ammable atmospheres

Store the transmitter in its original packaging in a location that fulls the conditions listed

above.

WARNING!

Before storing the instrument (following operation), remove any residual media.

This is of particular importance if the medium is hazardous to health, e.g. caustic,

toxic, carcinogenic, radioactive, etc.

6. Commissioning, operation

6.1 Mechanical mounting

6.1.1 Sealing the process connection

Correct sealing of the process connections with parallel threads at the sealing face must be

made using suitable at gaskets, sealing rings or WIKA prole sealings.

By installing a GDHT-20, a small quantity of humidity from the atmosphere inevi-

tably enters the measuring cell. The correct measuring results with non-owing,

very dry gas compartments will only become attained over time (depending on

the particular application, this may take several days).

The measuring point should preferably be positioned directly at the gas compart-

ment. Measurement at the end of measuring lines prevents optimal results

(unwanted temperature dierences and no humidity balance to the main tank).

6.1.2 Installation using an adapter and measuring chambers

CAUTION!

If the GDHT-20 is delivered with an adapter or measuring chamber, it is

completely mounted and tested for leak tightness in our company. Dismounting

compromises the leak tightness of the measuring assembly and renders it

unserviceable!

Parallel threads

per EN 837 per DIN 3869



Model GDT-20 Model GDHT-20

Otros manuales para GDT-20

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