WIKA RTD User manual
D
GB
Operating instructions
Betriebsanleitung
Examples/Beispiele
Resistance thermometers and thermocouples
Intrinsically safe designs (Ex-i)
Widerstandsthermometer und Thermoelemente
Eigensichere Ausführungen (Ex-i)
TÜV 10 ATEX 555793 X
IECEx TUN10.0002 X
D
GB
2 WIKA operating instructions RTD and TC, intrinsically safe designs
3345267.08 06/2011 GB/D
© 2010 WIKA Alexander Wiegand SE & Co. KG
All rights reserved. / Alle Rechte vorbehalten.
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!
Operating instructions models RTD and TC, Ex-i Page 3 - 46
Betriebsanleitung Typen RTD und TC, Ex-i Seite 47 - 86
1. General information 4
2. Safety 5
3. Specications 10
4. Design and function 13
5. Transport, packaging and storage 14
6. Commissioning, operation 15
7. Information on mounting and operation in hazardous areas
(Europe) 21
8. Electrical connection values 30
9. Calculation examples for self-heating at the probe/
thermowell tip 32
10. Maintenance and cleaning 36
11. Faults 36
12.
Dismounting, return and disposal
37
Appendix 1: EC type examination certicate
39
Appendix 2: IECEx certicate
43
Appendix 3: EC declaration of conformity
46
WIKA operating instructions RTD and TC, intrinsically safe designs
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Contents
Contents
Declarations of conformity can be found online at www.wika.com.
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1. General information
■
The instrument described in the operating instructions has been designed and manufactured
using state-of-the-art technology. All components are subject to stringent quality and
environmental criteria during production. Our management systems are certied 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 instrument 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
insuciently qualied skilled personnel or unauthorised modications to the instrument.
■
The general terms and conditions, contained in the sales documentation, shall apply.
■
Subject to technical modications.
■
Further information:
- Internet address: www.wika.de / www.wika.com
- Application consultant: Tel.: (+49) 9372/132-0
Fax: (+49) 9372/132-406
E-Mail: info@wika.de
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, which can result in light injuries or
damage to equipment or the environment, if not avoided.
Information
… points out useful tips, recommendations and information for ecient and trouble-
free operation.
1. General information
WIKA operating instructions RTD and TC, intrinsically safe designs
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WARNING!
... indicates a potentially dangerous situation in a potentially explosive atmosphere,
resulting in serious injury or death, if not avoided.
WARNING!
... indicates a potentially dangerous situation, caused by hot surfaces or liquids, that
can result in burns if not avoided.
Abbreviations
RTD "Resistance Temperature Detector" = Resistance thermometers
TC "Thermocouple"
2. Safety
WARNING!
Before installation, commissioning and operation, ensure that the appropriate thermo-
meter has been selected in terms of measuring range, design and specic measuring
conditions.
Choose the thermowell with regard to the maximum pressure and temperature (e.g.
rating chart in DIN 43772).
Non-observance can result in serious injury and/or damage to equipment.
Further important safety instructions can be found in the individual chapters of these
operating instructions.
2.1 Intended use
These resistance thermometers and thermocouples are used for temperature measurement in
industrial applications, in hazardous areas.
Resistance thermometers are used for measuring temperatures from -200 ... +600 °C. For
thermocouples, the possible measuring ranges range from -200 ... +1200 °C. Thermometers
of this design can be installed directly in the process as well as in thermowells. The thermowell
designs can be selected as desired, but the operating process data (temperature, pressure,
density and ow rate) must be taken into account.
1. General information / 2. Safety
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The system operator is responsible for selecting the thermometer or thermowell, and for the
selection of their materials, so as to guarantee their safe operation within the system or machine.
When preparing a quote, WIKA can only give recommendations which are based on our
experience in similar applications.
The thermometer has been designed and built solely for the intended use described here and
may only be used accordingly.
The technical specications contained in these operating instructions must be observed.
Improper handling or operation of the instrument outside of its technical specications requires
the instrument to be shut down immediately and inspected by an authorised WIKA service
engineer.
If the instrument is transported from a cold into a warm environment, the formation of
condensation may result in the instrument malfunctioning. Before putting it back into operation,
wait for the instrument temperature and the room temperature to equalise.
The manufacturer shall not be liable for claims of any type based on operation contrary to the
intended use.
2.2 Personnel qualication
WARNING!
Risk of injury should qualication be insucient!
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 qualications described below.
■
Keep unqualied 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-specic 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, e.g. of aggressive media.
2.3 Additional safety instructions for instruments with ATEX and IECEx approvals
WARNING!
Non-observance of these instructions and their contents may result in the loss of
explosion protection.
2. Safety
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WARNING!
Follow the requirements of the 94/9/EC (ATEX) and IECEx directives.
Follow the respective national regulations concerning Ex-usage
(e.g. EN/IEC 60079-10 and EN/IEC 60079-14).
2.4 Special hazards
WARNING!
Observe the information given in the applicable type examination certicate and the
relevant country-specic regulations for installation and use in potentially explosive
atmospheres (e.g. EN/IEC 60079-14, NEC, CEC). Non-observance can result in
serious injury and/or damage to equipment.
For additional important safety instructions for instruments with ATEX/IECEx appro-
val, see chapter "2.3 Additional safety instructions for instruments with ATEX and
IECEx approvals".
WARNING!
For hazardous media such as oxygen, acetylene, ammable or toxic gases or liquids,
and refrigeration plants, compressors, etc., in addition to all standard regulations, the
appropriate existing codes or regulations must also be followed.
WARNING!
Protection from electrostatic discharge (ESD) required. The proper use of grounded
work surfaces and personal wrist straps is required when working with exposed
circuitry (printed circuit boards), in order to prevent static discharge from damaging
sensitive electronic components.
To ensure safe working on the instrument, the operating company must ensure
■
that suitable rst-aid equipment is available and aid is provided whenever required.
■
that the operating personnel are regularly instructed in all topics regarding work
safety, rst aid and environmental protection and know the operating instructions
and, in particular, the safety instructions contained therein.
WARNING!
Residual media in dismounted instruments can result in a risk to persons, the environ-
ment and equipment. Take sucient precautionary measures.
Do not use this instrument in safety or Emergency Stop devices. Incorrect use of the
instrument can result in injury.
Should a failure occur, aggressive media with extremely high temperature and under
high pressure or vacuum may be present at the instrument.
2. Safety
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2.5 Labelling / safety marks
2.5.1 Product labels for resistance thermometers
Model
Sensor in accordance with
standard
■
F Thin-lm resistor
■
W Wire-wound resistor
Approval number
Year of manufacture
For an explanation of
symbols, see page 10
Transmitter model
(only for design with transmitter)
Year of manufacture
For an explanation of
symbols, see page 10 Approval number
Model
2. Safety
■
Product label for TR10-A measuring insert
■
Additional data for Ex instruments
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2. Safety
2.5.2 Product labels for thermocouples
Model
Approval number
Year of manufacture
For an explanation of
symbols, see page 10
Transmitter model
(only for design with transmitter)
Year of manufacture
For an explanation of
symbols, see page 10 Approval number
Model
■
Product label for measuring insert TC10-A
■
Additional data for Ex instruments
"ungrounded"
Sensor in accordance with
standard
■
ungrounded
■
grounded
Legende:
■
ungrounded
welded insulated
■
grounded
welded to the sheath
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Explanation of symbols
Before mounting and commissioning the instrument, ensure you read the
operating instructions!
CE, Communauté Européenne
Instruments bearing this mark comply with the relevant European directives.
ATEX European Explosion Protection Directive
(Atmosphère = AT, explosible = EX)
Instruments bearing this mark comply with the requirements of the European
Directive 94/9/EC (ATEX) on explosion protection.
3. Specications
3.1 Resistance thermometer
Sensor connection method
■
2-wire The lead resistance is recorded as an error in the measurement.
■
3-wire With a cable length longer than approx. 30 m, measuring errors can occur.
■
4-wire
The internal lead resistance of the connecting wires is negligible.
Limiting error of the sensor per DIN EN 60751
■
Class B
■
Class A
■
Class AA
The combination of a 2-wire connection with Class A / Class AA is not permissible, since the lead
resistance of the measuring insert negates the higher sensor accuracy.
Basic values and limiting errors
Basic values and limiting errors for the platinum measurement resistances are laid down in
DIN EN 60751.
The nominal value of Pt100 sensors is 100 Ω at 0 °C.
The temperature coecient α can be stated simply to be between 0 °C and 100 °C with:
α = 3.85 ∙ 10-3 °C-1
The relationship between temperature and electrical resistance is described by polynomialss,
which are also dened in DIN EN 60751. Moreover, this standard species the basic values in °C
steps in tabular form.
2. Safety / 3. Specications
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