The instrument described in the operating instructions has been manufactured using state-ofthe-art technology. All components are subject to stringent quality and environmental criteria
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during production. Our management systems are certied to ISO 9001 and ISO 14001.
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These operating instructions contain important information on handling the instrument. Working
safely requires that all safety instructions and work instructions are observed.
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Observe the relevant local accident prevention regulations and general safety regulations for
the instrument's range of use.
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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.
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Skilled personnel must have carefully read and understood the operating instructions, prior to
beginning any work.
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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.
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The general terms and conditions, contained in the sales documentation, shall apply.
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Subject to technical modications.
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Further information:
- Internet address:
- Application consultant:
www.wika.de / www.wika.com
Tel.: +49 9372 132-0
Fax: +49 9372 132-406
info@wika.de
Explanation of symbols
WARNING!
... indicates a potentially dangerous situation, which 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.
DANGER!
...identies hazards caused by electric power. Should the safety instructions not be
observed, there is a risk of serious or fatal injury.
Before installation, commissioning and operation, ensure that the appropriate
thermometer 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.
table of contact ratings 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.
The instrument 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.
GB
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.
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The activities described in these operating instructions may only be carried out by
skilled personnel who have the qualications described below.
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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.
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 to prevent static discharge from damaging
sensitive electronic components.
To ensure safe working on the instrument, the operating company must ensure
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that suitable rst-aid equipment is available and aid is provided whenever required.
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that the operating personnel are regularly instructed in all topics regarding work
safety, rst aid and environmental protection and knows the operating instructions
and, in particular, the safety instructions contained therein.
DANGER!
Danger of death caused by electric current
Upon contact with live parts, there is a direct danger of death.
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Electrical instruments may only be installed and mounted by skilled electrical
personnel.
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Operation using a defective power supply unit (e.g. short circuit from the mains
voltage to the output voltage) may result in life-threatening voltages at the
instrument!
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.
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 coecient α can be stated
simply to be between 0 °C and 100 °C with:
-3
-1
α = 3.85 ∙ 10
The relationship between temperature and electrical resistance is described by polynomials,
which are also dened in DIN EN 60751. Moreover, this standard species the basic values in
°C steps in tabular form. Moreover, this standard species the basic values in °C steps in tabular
form.
Class
B -196 … +600 °C-50 … +500 °C±(0.30 + 0.0050 | t |)
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 sheet
IN 00.17 “Usage limitations and accuracies of platinum resistance thermometers per
EN 60751: 2008”.
Important factors which counteract the long-term stability of thermocouples.
Ageing eects/poisoning
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Oxidation processes in thermocouples which are not appropriately protected (“bare”
thermocouple wires) result in falsications of the characteristic curves.
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Foreign atoms (poisoning) that diuse into the original alloys lead to changes of these original
alloys and thus falsify the characteristic curve.
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The inuence 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. Thermocouple types J and T age slightly, as the pure metal leg oxidises rst.
In general, rising temperatures cause accelerated ageing eects.
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 aected
by it. The consequence of this eect is a drift of the measured value caused by decreasing
thermoelectric voltage. This eect 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.
Recommended max. operating temperature
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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.
K eect
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
GB
to approx. 0.8 mV (approx. 5 °C) in this range. The K eect 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 respect. Cooling in resting air can
already lead to deviations of 1 K.
In type N thermocouple, it has been possible to reduce this short-range-order eect 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 max. 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 specied 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
error must be considered.
For limiting deviations and further specications, see the corresponding WIKA data sheet and
technical information sheet IN 00.23, “Application of thermocouples”.
4. Design and function
4.1 Description
These thermometers (resistance thermometers and thermocouples) detect temperatures in
processes. These thermometers are suitable, depending on the version, for low, medium and high
process requirements.
They can be assembled as cable probes or as thermometers with a connection head. Optionally,
a temperature transmitter can be built into the connection head. For this temperature transmitter,
separate operating instructions will be enclosed.
Certain thermometer versions can be combined with a large number of thermowell designs.
Operation of these thermometers without a thermowell is only appropriate in special cases.
5. Transport, packaging and storage / 6. Commissioning, operation
5. Transport, packaging and storage
5.1 Transport
Check 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:
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Storage temperature:
Instruments without built-in transmitter: -40 ... +85 °C
Instruments with built-in transmitter:see operating instructions of the corresponding
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Humidity: 35 ... 85 % relative humidity (no condensation)
Avoid exposure to the following factors:
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Direct sunlight or proximity to hot objects
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Mechanical vibration, mechanical shock (putting it down hard)
Store the instrument in its original packaging in a location that fullls 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.
6. Commissioning, operation
WARNING!
When the thermometer is mounted, the temperature must not drop below the allowed
operating temperature (environment, medium) or exceed it, even when taking
convection and heat radiation into account!
WARNING!
Thermometers must be earthed if dangerous voltages could be expected at the
connection wires (caused, for example, by mechanical damage, electrostatic
The cable gland must be optimally sealed, to ensure that the required protection class is reached.
Requirements for meeting ingress protection
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Only use cable glands within their indicated clamping range (cable diameter suitable for the
cable gland)
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Do not use the lower clamping area with very soft cable types
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Only use circular cross-section cables (if necessary, slightly oval in cross-section)
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Do not twist the cable
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Repeated opening/closing is possible; however only if necessary, as it might have a detrimental
eect on the protection class
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For cable with a pronounced cold-ow behaviour the screw connection must be fully tightened
CAUTION!
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The protection class is not valid with armoured cables (stainless steel sheathed)
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Seal should be checked for signs of brittleness and, if necessary, replaced
6.3 Parallel threads
If the thermometer connecting head, extension neck, thermowell or process connection are
connected to parallel threads (e.g. G ½, M20 x 1.5 ...), these threads must be secured using seals
which prevent liquids from penetrating into the thermometer.
As standard, WIKA uses copper prole seals for the connection between the neck tube and the
thermowell, and at paper seals for the connection of the connection head and the extension neck
or thermowell.
If the thermometer and the thermowell are already connected, the seals will already be mounted.
The plant operator must check whether the seals are suitable for the operating conditions and
must replace them, if necessary, with suitable seals.
For thermometers without a thermowell, and/or where these are delivered separately, the seals
are not included and must be ordered separately.
GB
Tighten the threads by hand when carrying out the nal assembly on the plant. This will
correspond to the delivery status of the premounted components. The nal tightening torque
should be applied using a spanner (half rotation).
The seals must be replaced after dismantling!
The seals can be ordered from WIKA, indicating the WIKA order number and/or the
designation (see table).
6. Commissioning, operation / 7. Maintenance and cleaning
WIKA order no.
11349981per DIN 7603 Form C 14 x 18 x 2 -CuFAG ¼, M14 x 1,5
11349990per DIN 7603 Form C 18 x 22 x 2 -CuFAM18 x 1,5, G ⅜
GB
11350008per DIN 7603 Form C 21 x 26 x 2 -CuFAG ½, M20 x 1,5
11350016per DIN 7603 Form C 27 x 32 x 2.5 -CuFAG ¾, M27 x 2
11367416per DIN 7603 Form C20 x 24 x 2 -CuFAM20 x 1,5
1248278per DIN 7603 D21.2 x D25.9 x 1.5 -AlG ½, M20 x 1,5
3153134
3361485
StFA = Soft iron, 80 to 95 HBa, with a lling made of asbestos-free sealing material
DesignationSuitable for threads
per DIN 7603 Form C D14.2 x D17.9 x 2 -StFA
per DIN 7603 Form C D33.3 x D38.9 x 2.5 -
a
, with a lling made of asbestos-free sealing material
b
StFA
G ¼, M14 x 1,5
G 1
6.4 Tapered threads (NPT)
Connections with tapered threads (NPT) are self-sealing and normally must not be sealed. It
should be checked whether it may be necessary to seal them additionally with PTFE tape or
hemp. The threads must be lubricated with a suitable lubricant before tting.
Tighten the threads by hand when carrying out the nal assembly on the plant. This will
correspond to the delivery status of the premounted components. The nal tightening and sealing
must be made with a spanner (1.5 to 3 rotations).
7. Maintenance and cleaning
7.1 Maintenance
These thermometers are maintenance-free.
Repairs must only be carried out by the manufacturer.
7.2 Cleaning
CAUTION!
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Before cleaning, correctly disconnect the instrument from the pressure supply,
switch it o and disconnect it from the mains.
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Clean the instrument with a moist cloth.
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Electrical connections must not come into contact with moisture.
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Wash or clean the dismounted instrument before returning it, in order to protect
personnel and the environment from exposure to residual media.
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Residual media in dismounted instruments can result in a risk to personnel, the
environment and equipment. Take sucient precautionary measures.
For information on returning the instrument see chapter 9.2 “Return”.
It is recommended that the measuring insert is recalibrated at regular intervals (resistance
thermometers: approx. 24 months, thermocouples: approx. 12 months). This period can be
reduced, depending on the particular application. The calibration can be carried out by the
manufacturer, as well as on site by qualied technical sta with calibration instruments.
8. Faults
FaultsCausesMeasures
No signal/line breakage
Erroneous measured values
Erroneous measured values
(too low)
Erroneous measured values
and response times too long
Erroneous measured values
(of thermocouples)
Indication of the measured
value jumps
Corrosion
Signal interference
Mechanical load too high or
overtemperature
Sensor drift caused by
overtemperature
Sensor drift caused by chemical attack
Entry of moisture into cable or
measuring insert
Wrong mounting geometry, for example
mounting depth too deep or heat
dissipation too high
Deposits on the sensor or thermowell Remove deposits
Parasitic voltages (thermal voltages,
galvanic voltage) or wrong equalisation
line
Cable break in connecting cable or
loose contact caused by mechanical
overload
Composition of the medium not
as expected or modied or wrong
thermowell material selected
Stray currents caused by electric elds
or earth loops
Earth circuitsElimination of potentials, use of
Replace probe or measuring insert
with a suitable design
Replace probe or measuring insert
with a suitable design
Use a design with thermowell
Replace probe or measuring insert
with a suitable design
The temperature-sensitive area of the
sensor must be inside the medium,
and surfaces must be isolated.
Use a suitable equalisation line
Replace probe or measuring insert
with a suitable design, for example
equipped with a strain relief or a
thicker conductor cross-section
Analyse medium and then select a
more-suitable material or replace
thermowell regularly
Use of screened connecting cables,
increase in the distance to motors and
power lines
galvanically isolated transmitter supply
isolators or transmitters
GB
CAUTION!
If deciencies cannot be eliminated by means of the measures listed above, shut
down the instrument immediately, and ensure that pressure and/or signal are no
longer present, and secure the instrument from being put back into operation
inadvertently.
In this case, contact the manufacturer.
If a return is needed, please follow the instructions see chapter 9.2 “Return”.
Das in der Betriebsanleitung beschriebene Gerät wird nach dem aktuellen Stand der Technik
gefertigt. Alle Komponenten unterliegen während der Fertigung strengen Qualitäts- und
Umweltkriterien. Unsere Managementsysteme sind nach ISO 9001 und ISO 14001 zertiziert.
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Diese Betriebsanleitung gibt wichtige Hinweise zum Umgang mit dem Gerät. Voraussetzung
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für sicheres Arbeiten ist die Einhaltung aller angegebenen Sicherheitshinweise und
Handlungsanweisungen.
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Die für den Einsatzbereich des Gerätes geltenden örtlichen Unfallverhütungsvorschriften und
allgemeinen Sicherheitsbestimmungen einhalten.
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Die Betriebsanleitung ist Produktbestandteil und muss in unmittelbarer Nähe des Gerätes für
das Fachpersonal jederzeit zugänglich aufbewahrt werden.
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Das Fachpersonal muss die Betriebsanleitung vor Beginn aller Arbeiten sorgfältig durchgelesen und verstanden haben.
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Die Haftung des Herstellers erlischt bei Schäden durch bestimmungswidrige Verwendung,
Nichtbeachten dieser Betriebsanleitung, Einsatz ungenügend qualizierten Fachpersonals
sowie eigenmächtiger Veränderung am Gerät.
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Es gelten die allgemeinen Geschäftsbedingungen in den Verkaufsunterlagen.
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Technische Änderungen vorbehalten.
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Weitere Informationen:
- Internet-Adresse:www.wika.de / www.wika.com
- Anwendungsberater:
Tel.: +49 9372 132-0
Fax: +49 9372 132-406
info@wika.de
Symbolerklärung
WARNUNG!
… weist auf eine möglicherweise gefährliche Situation hin, die zum Tod oder zu
schweren Verletzungen führen kann, wenn sie nicht gemieden wird.
VORSICHT!
… weist auf eine möglicherweise gefährliche Situation hin, die zu geringfügigen oder
leichten Verletzungen bzw. Sach- und Umweltschäden führen kann, wenn sie nicht
gemieden wird.
Information
… hebt nützliche Tipps und Empfehlungen sowie Informationen für einen ezienten
und störungsfreien Betrieb hervor.
GEFAHR!
… kennzeichnet Gefährdungen durch elektrischen Strom. Bei Nichtbeachtung der
Sicherheitshinweise besteht die Gefahr schwerer oder tödlicher Verletzungen.
Vor Montage, Inbetriebnahme und Betrieb sicherstellen, dass das richtige Thermo-
meter hinsichtlich Messbereich, Ausführung und spezischen Messbedingungen
ausgewählt wurde.
Schutzrohr hinsichtlich Maximaldruck und -temperatur (z. B. Belastungsdiagramme in
DIN 43772) auswählen.
Bei Nichtbeachten können schwere Körperverletzungen und/oder Sachschäden
auftreten.
Weitere wichtige Sicherheitshinweise benden sich in den einzelnen Kapiteln dieser
Betriebsanleitung.
2.1 Bestimmungsgemäße Verwendung
Diese Widerstandsthermometer und Thermoelemente dienen zur Temperaturmessung in industriellen Anwendungen.
Das Gerät ist ausschließlich für den hier beschriebenen bestimmungsgemäßen Verwendungszweck konzipiert und konstruiert und darf nur dementsprechend verwendet werden.
Die technischen Spezikationen in dieser Betriebsanleitung sind einzuhalten. Eine unsachgemäße Handhabung oder ein Betreiben des Gerätes außerhalb der technischen Spezikationen
macht die sofortige Stilllegung und Überprüfung durch einen autorisierten WIKA-Servicemitarbeiter erforderlich.
D
Wird das Gerät von einer kalten in eine warme Umgebung transportiert, so kann durch Kondensatbildung eine Störung der Gerätefunktion eintreten. Vor einer erneuten Inbetriebnahme die
Angleichung der Gerätetemperatur an die Raumtemperatur abwarten.
Ansprüche jeglicher Art aufgrund von nicht bestimmungsgemäßer Verwendung sind ausgeschlossen.
2.2 Personalqualikation
WARNUNG!
Verletzungsgefahr bei unzureichender Qualikation!
Unsachgemäßer Umgang kann zu erheblichen Personen- und Sachschäden führen.
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Die in dieser Betriebsanleitung beschriebenen Tätigkeiten nur durch Fachpersonal