WIKA TR10-W User manual

Operating instructions
Betriebsanleitung
GB
D
Models TR10-W, TC10-W
Resistance thermometer TR10-W and thermocouple TC10-W
Ignition protection type Ex d ameproof enclosure per 94/9/EC (ATEX)
Widerstandsthermometer TR10-W und Thermoelement TC10-W
Zündschutzart druckfeste Kapselung Ex d nach 94/9/EC (ATEX)
Ex d BVS 07 ATEX E 071 X
IECEx BVS 11.0042X

GB
D
2
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WIKA operating instructions models TR10-W, TC10-W (Ex d)
Operating instructions models TR10-W, TC10-W (Ex d) Page 3 - 26
Betriebsanleitung Typen TR10-W, TC10-W (Ex d) Seite 27 - 50
© 2012 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!

GB
1. General information 4
2. Safety 5
3. Specications 9
4. Design and function 12
5. Transport, packaging and storage 15
6. Commissioning, operation 16
7. Information on mounting and operation in hazardous
areas 16
8. Safety-related instructions for the dierent variants 18
9. Calculation examples for self-heating at the thermowell tip 21
10. Maintenance and cleaning 23
11. Faults 24
12. Dismounting, return and disposal 25
Appendix: EC declaration of conformity 26
Declarations of conformity can be found online at www.wika.com.
Contents
Contents
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WIKA operating instructions models TR10-W, TC10-W (Ex d) 3

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WIKA operating instructions models TR10-W, TC10-W (Ex d)4
1. General information
■
The thermometers described in the operating instructions have 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
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
- Relevant data sheet: TE 60.14 (TR10-W), TE 65.14 (TC10-W)
- Application consultant: Tel.: [phone]
Fax: [phone]
[e-mail]
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.
1. General information

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WIKA operating instructions models TR10-W, TC10-W (Ex d) 5
Information
... points out useful tips, recommendations and information for ecient and
trouble-free operation.
DANGER!
... identies hazards caused by electrical power. Should the safety instructions
not be observed, there is a risk of serious or fatal injury.
WARNING!
... indicates a potentially dangerous situation in the hazardous area that can
result in serious injury or death, if not avoided.
WARNING!
... indicates a potentially dangerous situation that can result in burns, caused by
hot surfaces or liquids, if not avoided.
Abbreviations
RTD “Resistance temperature detector”; resistance thermometer
TC Thermocouple
2. Safety
WARNING!
Before installation, commissioning and operation, ensure that the appropriate
thermometer has been selected in terms of measuring range, design and
specic measuring conditions.
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
Thermometers in this series can be combined with a large number of thermowell designs.
Operation without thermowell is only recommended in certain applications. A wide variety
of possible combinations of sensor, connection head, insertion length, neck length,
connection to thermowell etc. are available for the thermometers; suitable for almost any
thermowell dimension.
1. General information / 2. Safety

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WIKA operating instructions models TR10-W, TC10-W (Ex d)6
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.
If the instrument is transported from a cold into a warm environment, the formation of
condensation may result in instrument malfunction. 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 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, e.g. of aggressive
media.
2. Safety

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WIKA operating instructions models TR10-W, TC10-W (Ex d) 7
2.3 Special hazards
WARNING!
Observe the information given in the applicable type examination certicate and
the relevant country-specic regulations for installation and use in hazardous
areas (e.g. IEC 60079-14, NEC, CEC). Non-observance can result in serious
injury and/or damage to the equipment.
For further important safety instructions for instruments with ATEX approval, see
chapter 7 “Information on mounting and operation in hazardous areas”.
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 the dismounted instrument can result in a risk to persons, the
environment and equipment. Take sucient 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

GB
TR10-W
1 x Pt100 / A / 3 (F) -50 ... +500 °C
Um = DC 30 V / Pm = 2 W
BVS 07 ATEX E 071 X
IECEx BVS 11.0042X
II 2 G Ex d IIC T* Gb
EN 60751
0158
WIKA Alexander Wiegand SE & Co.KG, D-63911 Klingenberg
Made in Germany 2013 WARNING: DO NOT OPEN WHILE ENERGIZED!
11012345
TC10-W
1 x Typ K / 1 / . 0 ... +600 °C
Um = DC 30 V / Pm = 2 W
BVS 07 ATEX E 071 X
IECEx BVS 11.0042X
II 2 G Ex d IIC T* Gb
EN 60584-1
0158
11012345
WIKA Alexander Wiegand SE & Co.KG, D-63911 Klingenberg
Made in Germany 2013 WARNING: DO NOT OPEN WHILE ENERGIZED!
TR10-W
1 x Pt100 / A / 3 (F) -50 ... +500 °C
Um = DC 30 V / Pm = 2 W
BVS 07 ATEX E 071 X
IECEx BVS 11.0042X
II 2 G Ex d IIC T* Gb
EN 60751
0158
WIKA Alexander Wiegand SE & Co.KG, D-63911 Klingenberg
Made in Germany 2013 WARNING: DO NOT OPEN WHILE ENERGIZED!
11012345
TC10-W
1 x Typ K / 1 / . 0 ... +600 °C
Um = DC 30 V / Pm = 2 W
BVS 07 ATEX E 071 X
IECEx BVS 11.0042X
II 2 G Ex d IIC T* Gb
EN 60584-1
0158
11012345
WIKA Alexander Wiegand SE & Co.KG, D-63911 Klingenberg
Made in Germany 2013 WARNING: DO NOT OPEN WHILE ENERGIZED!
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WIKA operating instructions models TR10-W, TC10-W (Ex d)8
2.4 Labelling, safety marking
2.4.1 Product labels for resistance thermometers
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.
Sensor in accordance with standard
■
FThin-lm measuring resistor
■
W Wire-wound measuring resistor
Sensor in accordance with standard
■
ungrounded
■
grounded Legend:
■
ungrounded
ungrounded welded
■
grounded
welded to the sheath (grounded)
2.4.2 Product labels for thermocouples
Model
Year of manufacture
Model
Year of manufacture
2. Safety

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WIKA operating instructions models TR10-W, TC10-W (Ex d) 9
3. Specications
3.1 Resistance thermometer
Sensor connection method
■
2-wire
■
3-wire
■
4-wire
Sensor tolerance value per DIN EN 60751
■
Class B
■
Class A
■
Class AA
The combinations of a 2-wire connection with class A or class AA are not permissible, since
the lead resistance of the measuring insert negates the higher sensor accuracy.
Basic values and tolerance values
Basic values and tolerance values 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 coecient 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
polynomials, which are also dened in DIN EN 60751. Moreover, this standard species the
basic values in °C steps in tabular form.
Class Temperature range Tolerance value in °C
Wire-wound (W) Thin-lm (F)
B-196 … +600 °C -50 … +500 °C ±(0.30 + 0.0050 | t |) 1)
A-100 … +450 °C -30 … +300 °C ±(0.15 + 0.0020 | t |) 1)
AA -50 … +250 °C 0 … 150 °C ±(0.10 + 0.0017 | t |) 1)
1) | t | is the value of the temperature in °C without consideration of the sign.
Bold: Standard version
For further technical information, see WIKA data sheet and the Technical information
IN 00.17 “Usage limitations and accuracies of platinum resistance thermometers per
EN 60751: 2008”.
3. Specications

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WIKA operating instructions models TR10-W, TC10-W (Ex d)10
3.2 Thermocouples
3.2.1 Sensor types
Type Recommended max. operating temperature
K1,200 °C
J 800 °C
E 800 °C
N1,200 °C
3.2.2 Potential measurement uncertainties
Important factors which counteract the long-term stability of thermocouples.
Ageing eects/poisoning
■
Oxidation processes in thermocouples which are not appropriately protected (“bare”
thermocouple wires) result in falsications of the characteristic curves.
■
Foreign atoms (poisoning) that diuse into the original alloys lead to changes of these
original alloys and thus falsify the characteristic curve.
■
The inuence of hydrogen leads to the embrittlement of the thermocouples.
The Ni leg of the type K thermocouple is often damaged by sulphur which is contained in
exhaust gases, for example.Type J and T thermocouples age slightly, as the pure metal leg
oxidises rst.
In general, rising temperatures cause accelerated ageing eects.
Green rot
If type K thermocouples are used at temperatures from approx. 800 °C to 1,050 °C,
considerable changes of the thermoelectric voltage can occur. The cause of this is a
chromium depletion or the chrome oxidation in the NiCr leg (+ leg).The precondition
for this is a low concentration of oxygen or steam in the immediate environment of the
thermocouple. The nickel leg is not aected by it. The consequence of this eect is a drift of
the measured value caused by decreasing thermoelectric voltage. This eect is accelerated
if there is a shortage of oxygen (reducing atmosphere), since a complete oxide layer, which
would protect it from further oxidation of the chromium, cannot be formed on the surface of
the thermocouple.
The thermocouple is permanently destroyed by this process.The name green rot is derived
from the greenish shimmering colouration on the breaking point of the wire.
The thermocouple type N has in this regard an advantage due to its silicium content. Here,
a protective oxide layer forms on its surface under the same conditions.
3. Specications

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WIKA operating instructions models TR10-W, TC10-W (Ex d) 11
K eect
The NiCr leg of a type K thermocouple has an ordered alignment with respect to the
alignment in the crystal lattice below approx. 400 °C. If the thermocouple is heated further,
a transition to a disordered state occurs in the temperature range between approx. 400 °C
and 600 °C. Above 600 °C, an ordered crystal lattice is restored.
If these thermocouples cool too quickly (quicker than approx. 100 °C per hour), the
undesirable disordered crystal lattice occurs again during cooling in the range from
approx. 600 °C to approx. 400 °C. In the characteristic curve of type K, however, a
consistently ordered alignment state is assumed and provided with values.This results
in a fault of thermoelectric voltage of up to approx. 0.8 mV (approx. 5 °C) in this range.
The K eect is reversible and is largely eliminated again by annealing above 700 °C,
followed by correspondingly slow cooling.
Thin sheathed thermocouples are particularly sensitive in this regard. Cooling in resting air
can already lead to deviations of 1 °C.
In type N thermocouples, it has been possible to reduce this short-range-order eect by
alloying both legs with silicium.
The application range of these thermometers is limited both by the permissible maximum
temperature of the thermocouple and by the permissible maximum temperature of the
thermowell material.
Listed models are available both as single or dual thermocouples.The thermocouple will be
delivered with an insulated measuring point, unless explicitly specied otherwise.
Tolerance value
For the tolerance value of thermocouples, a cold junction temperature of 0 °C has been
taken as the basis. When using a compensating cable or thermocouple cable, an additional
measuring deviation must be considered.
For tolerance values and further specications, see the corresponding WIKA data sheet
and Technical information IN 00.23, “Application of thermocouples”.
For further specications see WIKA data sheets TE 60.14, TE 65.14 and order
documentation.
For further important safety instructions for operation in hazardous areas, see
chapter 7 “Information on mounting and operation in hazardous areas”.
3. Specications

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WIKA operating instructions models TR10-W, TC10-W (Ex d)12
4. Design and function
4.1 Resistance thermometer model TR10-W
The resistance thermometers of model TR10-W consist of a ameproof enclosure, a
measuring insert which is mounted elastically in a neck tube.The measuring insert in
connection with the neck tube functions as a amepath. The choice of the housing to be
mounted and installed is dened by the WIKA housing/instrument list. When applying it,
always use the latest revision of it.
The thermometers are designed to be resistant to shock and vibration and all electrical
components are protected against splash water.The vibration resistance of the standard
version corresponds to DIN EN 60751 (up to 3 g). The impact resistance of all versions
meets the requirements of DIN EN 60751.
The electrical connection is performed using Ex d certied components.
CAUTION!
Resistance thermometers of this model range must be installed with a
thermowell (minimal wall thickness: 1 mm). The design of the thermowells can
be selected optionally, but the operational process data (temperature, pressure,
density and ow rate) must be taken into account.
Possible sensor measuring ranges: from -200 … +600 °C
4.2 Thermocouple model TC10-W
The thermocouples of model TC10-W consist of a ameproof enclosure, a measuring insert
which is mounted elastically in a neck tube.The measuring insert in connection with the
neck tube functions as a amepath. The choice of the housing to be mounted and installed
is dened by the WIKA housing/instrument list. When applying it, always use the latest
revision of it.
The thermometers are designed to be resistant to shock and vibration and all electrical
components are protected against splash water.
The electrical connection is performed using Ex d certied components.
CAUTION!
Thermocouples of this model range must be installed with a thermowell
(minimal wall thickness: 1 mm). The design of the thermowells can be selected
as desired, but the operational process data (temperature, pressure, density
and ow rate) must be taken into account.
Possible measuring ranges: from -200 … +1.200 °C
The following mounting and operating information has been compiled with care. However, it
is not possible to consider all potential usage cases.
4. Design and function

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WIKA operating instructions models TR10-W, TC10-W (Ex d) 13
4.3 Technical description of the three variants
Variant 1: ATEX/IECEx-Ex d
housing or connection head
(with connection terminals,
without transmitter)
Variant 2: ATEX/IECEx-Ex d
housing or connection head
(with built-in head-mounted
transmitter)
Variant 3: ATEX/IECEx-
Ex d certied temperature
transmitter
Legend:
Connection head
Neck tube
Connection to thermowell
Measuring insert
Terminal block/transmitter (option)
Field transmitter
Thread Thread Thread
T4
T3
T1
Tundened
T4: {-50} -40 °C < Ta < +85 °C
T3: {-50} -40 °C < Ta < +150 °C
T1: {-50} -40 °C < Ta < +300 °C
Variant 1:
The thermometer is tted to a certied enclosure with ignition protection type “ameproof
enclosure”, which has a built-in terminal block. If the thermometer is marked with II 2G Ex d
IIC T1-T6 Gb, it is designed for use in zone 1 with a thermowell.
If the thermometer is marked with II 1/2G Ex d IIC T1-T6 Ga/Gb, then it is designed for use
with a thermowell at the partition to zone 0.
Variant 2:
The thermometer is built into a certied enclosure, with an ignition protection type of
“ameproof enclosure”, in which an electronic assembly has been tted.
If the thermometer is marked with II 2G Ex d IIC T1-T6 Gb, it is designed for use in zone 1
with a thermowell.
If the thermometer is marked with II 1/2G Ex d IIC T1-T6 Ga/Gb, then it is designed for use
with a thermowell at the partition to zone 0.
4. Design and function

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WIKA operating instructions models TR10-W, TC10-W (Ex d)14
Variant 3:
The thermometer is tted to certied equipment (transmitter) with an ignition protection type
of “ameproof enclosure”.
The thermometer is marked with II 2G Ex d IIC Gb and is designed for use in zone 1 with
a thermowell. For any potential usage at the partition to zone 0 with a thermowell, the
approvals and conditions of the relevant transmitters must be considered.
4.4 Neck tube versions
xed design multi-part design
11401940.01
Thread
Thread
Thread
Thread
4.5 Housing- and connection heads
The dimensions of the housing- and connection heads are given in the respective data
sheet.
4.6 Scope of delivery
Cross-check scope of delivery with delivery note.
4. Design and function

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WIKA operating instructions models TR10-W, TC10-W (Ex d) 15
5. Transport, packaging and storage
5.1 Transport
Check the instrument 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: {-50} -40 ... +80 °C
■
Humidity: 35 ... 85 % relative humidity (no condensation)
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 instrument in its original packaging in a location that fulls the conditions listed
above. If the original packaging is not available, pack and store the instrument as described
below:
1. Wrap the instrument in an antistatic plastic lm.
2. Place the instrument along with shock-absorbent material in the packaging.
3. If stored for a prolonged period of time (more than 30 days), place a bag containing a
desiccant inside the packaging.
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.
5. Transport, packaging and storage

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WIKA operating instructions models TR10-W, TC10-W (Ex d)16
6. Commissioning, operation
6.1 Electrical connection
Variant 1
For the electrical specications (e.g. connection diagrams, tolerance values, etc.) please
refer to the data sheets TE 60.14 (for TR10-W) and TE 65.14 (for TC10-W).
Variant 2
For the electrical specications (e.g. connection diagrams, tolerance values etc.), refer to
the corresponding data sheet of the built-in head-mounted transmitters.
Variant 3
For the electrical specications (e.g. connection diagrams, tolerance values etc.), refer to
the corresponding data sheet of the tted Ex d certied eld transmitters.
6.2 Locking screw
Always tighten the locking screw to prevent unintended opening of
the head with ameproof enclosure.
Before opening the head, always loosen the locking screw
suciently.
7. Information on mounting and operation in hazardous areas
WARNING!
Non-observance of these instructions and their contents may result in the loss
of explosion protection.
The requirements of the 94/9/EC (ATEX) directive must be followed. Additionally
the specications of the respective national regulations concerning Ex usage
(e.g. EN/IEC 60079-10 and EN/IEC 60079-14) apply.
■
The responsibility for classication of zones lies with the plant operator and not the
manufacturer/supplier of the equipment.
■
The plant operator guarantees, and is solely responsible, that all thermometers in use
are identiable with respect to all safety-relevant characteristics. Damaged thermometers
may not be used.
■
For the installation of the thermometer, only components (e.g. cables, cable glands, etc.)
permitted for “ameproof” may be used.
■
For earthing the conductive screen, follow the specications of EN/IEC 60079-14.
6. Commissioning, operation / 7. Information on mounting ...

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WIKA operating instructions models TR10-W, TC10-W (Ex d) 17
■
When using a transmitter/digital display, note and follow:
- The contents of these operating instructions and those of the transmitter/digital display
- The relevant regulations for installation and use of electrical systems
- The regulation and guidelines regarding explosion protection
■
The certied ameproof thermometers should only be tted to housing- or connection
heads certied with a “ameproof” ignition protection type.
■
Certied and listed eld cases (variant 3) should only be tted and installed by a
specialist trained to the latest technology.
■
For tting, the permitted ameproof joints for electrical equipment for gas hazardous
areas are contained in EN/IEC 60079-1. Flameproof joints (section 5.3) for parallel
threads (in accordance with table 3), must be ≥ 5 mm for housing volumes < 100 cm³
and ≥ 8 mm for housing volumes > 100 cm³. There must be ≥ 5 threads engaged.
Flameprooof joints (section 5.3) for tapered threads (in accordance with table 3), must
have ≥ 5 available threads on each part. There must be ≥ 3.5 threads engaged.
These specications for ameproof joints must be adhered to, without fail, when tting
and during operation.
■
The direct threaded connection of the thermometer to the connection head or housing
must not be twisted or opened. Any alignment of the housing may only be made using
the optional “nipple-union-nipple” neck tube.
■
The temperature resistance of the connecting cable must match the permissible
operating temperature of the housing.
For ambient temperatures above 60 °C, heat-resistant connecting cable must be used.
■
No batteries may be built in to the ameproof housing.
■
No capacitor may be tted within the ameproof housing that has a residual energy of
≥ 0.02 mJ at the end of the time required to open the housing. The housing must not be
opened during operation. After the power supply has been switched o, a waiting time of
2 minutes must be observed before opening the housing.
■
Mounting within metallic enclosures:
The housing must be grounded against electromagnetic elds and electrostatic
discharge. It does not have to be connected separately to the equipotential bonding
system. It is sucient if the metallic thermowell has a solid and secured contact with the
metallic vessel or its structural components or pipelines, so long as these components
are connected to the equipotential bonding system.
■
Fitting in non-metallic vessels:
All electrically-conductive thermometer components within the hazardous area must be
provided with equipotential bonding.
■
Neither repairs nor structural modications are permitted, and any would void the
guarantee and the respective certication.
■
The manufacturer shall not be responsible for constructional modications after delivery
of the instruments.
7. Information on mounting and operation in hazardous areas

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WIKA operating instructions models TR10-W, TC10-W (Ex d)18
8. Safety-related instructions for the dierent variants
8.1 Variant 1:
ATEX/IECEx-Ex d housing or connection head (with connection terminals, without transmitter)
Evaluation of the resistance or the thermoelectric potential between electronics outside of
the hazardous area.
Use in zone 1, marking II 2G Ex d IIC T1-T6 Gb
The ameproof housing or the connection head is in zone 1 (or zone 2). The sensor is within
a thermowell (made of corrosion resistant steel, min. wall thickness 1 mm) which extends
into zone 1 via a process connection. In this case, no power limitation is needed, since no
error monitoring is performed by the electronic evaluation system.
Use with a thermowell at the partition to zone 0, marking II 1/2G Ex d IIC T1-T6 Ga/Gb
The ameproof housing or the connection head is in zone 1 (or zone 2). The sensor is
within a thermowell (min. wall thickness 1 mm) which extends into zone 0 via a process
connection.
The thermometer should therefore be operated with a power-limiting circuit.
Pmax: 2 W Umax: 30 V
A power supply with Ex ia circuitry fullls these conditions, but is not required if the limits
can be achieved through other measures.The responsibility rests with the operator.
Temperature class classication, ambient temperatures
Ambient temperature range for all WIKA connection heads: -40 … +85 °C
The permissible ambient temperatures for third-party products can be seen from the
relevant approvals and/or data sheets.
A heating in the connection head does not occur with varient 1. However, an impermissible
heat reux from the process which can exceed the operating temperature of the housing or
the temperature class, must be prevented through suitable heat insulation or a suitably long
neck tube.
8.2 Variant 2:
ATEX/IECEX-Ex d housing or connection head with built-in head-mounted transmitter
The evaluation is performed using current (4 … 20 mA), voltage (2 … 10 V) or eldbus
signal, which is generated by a head-mounted transmitter.
Use in zone 1, marking II 2G Ex d IIC T1-T6 Gb
The ameproof housing or the connection head is in zone 1 (or zone 2). The sensor is
within a thermowell (min. wall thickness 1 mm) which extends into zone 1 via a process
connection.
8. Safety-related instructions for the dierent variants

GB
14030069.02 03/2014 GB/D
WIKA operating instructions models TR10-W, TC10-W (Ex d) 19
Use with a thermowell at the partition to zone 0, marking II 1/2G Ex d IIC T1-T6 Ga/Gb
The ameproof housing or the connection head is in zone 1 (or zone 2). The sensor is
within a thermowell (min. wall thickness 1 mm) which extends into zone 0 via a process
connection.
The thermometer should be operated with a power-limiting circuit.
Pmax: 2 W Umax: 30 V
A power supply with Ex ia circuits meets these conditions, but is not required if the limits
can be achieved with other measures.The responsibility rests with the operator.
WIKA recommends realising the power limitation through a suitable fuse in the 4 ... 20 mA
current loop of the head-mounted transmitter. In the event of a failure of the head-mounted
transmitter, the circuit will be interrupted through the fuse tripping.
Example for calculating the fuse for a maximum power at the sensor of 0.8 Watt:
The internal resistance of thermocouples is signicantly lower than the thermal resistance
of a Pt100 sensor, so the much less favourable case for a resistance thermometer has been
calculated.
Pall = (1.7 x Is)² x Rw
Is= Fuse rating
Pall = maximum power at sensor = 0.8 W
Rw= Resistance of the sensor (temperature-dependent)
at 450 °C = 264.18 Ω in accordance with DIN EN 60751 for Pt100
The following denes the fuse rating:
Is= sqrt (Pall / Rw) / 1.7
Is = sqrt (0.8 W / 265 Ω) / 1.7
Is= 32.32 mA
This results in a rated current for a fuse link = 32 mA
Notes for fuse calculation:
The next smallest fuse value, in accordance with IEC 60127, must always be chosen. The
breaking capacity must be matched, by sensible engineering, to the voltage supply. Usual
values for such fuse links lie between AC 20 A and AC 80 A rated breaking capacity.
For a maximum power at the sensor of 0.5 W the following value is given:
Is = sqrt (0.5 W / 265 Ω) / 1.7
Is= 25.55 mA
This results in a rated current for a fuse link = 25 mA
When using multiple sensors and simultaneous operation, the sum of the individual powers
must not exceed the value of the maximum permissible power.
Internal resistance of Ø 6 mm TC measuring inserts: approx. 1.2 Ω/m
Internal resistance of Ø 3 mm TC measuring inserts: approx. 5.6 Ω/m
These measured values are valid for room temperature.
8. Safety-related instructions for the dierent variants

GB
14030069.02 03/2014 GB/D
WIKA operating instructions models TR10-W, TC10-W (Ex d)20
Temperature class classication, ambient temperatures
A heating in the connection head can occur with variant 2 through faulty electronics.The
permissible ambient temperatures depend on the housing used and any additionally-tted
head-mounted transmitter.
For all WIKA connection heads with built-in WIKA temperature transmitters, the
following interrelation is valid:
The temperature increase on the surface of the connection head or housing is less than
25 K if the following conditions are observed: power supply UBmaximum DC 30 V when the
transmitter is operated in a current limit of 22.5 mA.
This yields the following temperature class classication.
Temperature class Ambient temperature
T6 -40 … +55 °C
T5 -40 … +75 °C
T4, T3, T2, T1 -40 … +85 °C
The permissible ambient temperatures for third-party products can be seen from the
relevant approvals or data sheets. However, an impermissible heat reux from the process
which can exceed the operating temperature of the housing or the temperature class, must
be prevented through suitable heat insulation or a suitably long neck tube.
8.3 Variant 3
ATEX/IECEx Ex d certied temperature transmitters.
The evaluation is performed using current (4 … 20 mA), voltage (2 … 10 V) or eldbus
signal, which is generated by an ATEX/IECEx Ex d certied temperature transmitter.
Use in zone 1, marking II 2G Ex d IIC Gb
The Ex d eld transmitter is located in zone 1 (or zone 2). The sensor is within a thermowell
(min. wall thickness 1 mm) which extends into zone 1 via a process connection.
The main Ex marking is located on the certied Ex d eld transmitter. The TR10-W and
TC10-W instruments are marked with a foil plate on the neck tube.
For a possible use at the partition to zone 0 with a thermowell, the approvals and conditions
of the relevant Ex d eld transmitters must be followed.
Temperature class classication, ambient temperatures
Ambient temperature range for the measuring insert with neck tube: -40 … +85 °C.
The permissible ambient temperatures of the certied Ex d eld transmitter must be taken
from the respective operating instructions or data sheets. Through deviations in temperature
ranges, limitations can occur.
8. Safety-related instructions for the dierent variants