WIKA TR25 (Ex i) User manual

EN
FR
DE
ES
Operating instructions
Betriebsanleitung
Mode d'emploi
Manual de instrucciones
In-line resistance thermometer, model TR25
Intrinsically safe version (Ex i)
Rohr-In-Line-Widerstandsthermometer, Typ TR25
Eigensichere Ausführung (Ex i)
Sonde à résistance en ligne, type TR25
Versions à sécurité intrinsèque (Ex i)
Termorresistencia en línea, modelo TR25
Versión de seguridad intrínseca (Ex i)
In-line resistance thermometer, Ex i, model TR25
Options: Sealing combination at neck tube, cable gland in hygienic design
®
JUNE 2018
TYPE EL
CLASS I

EN
FR
DE
ES
2
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i)
Operating instructions model TR25 (Ex i) Page 3 - 36
Betriebsanleitung Typ TR25 (Ex i) Seite 37 - 66
Mode d'emploi type TR25 (Ex i) Page 67 - 96
Manual de instrucciones modelo TR25 (Ex i) Página 97 - 125
© 10/2013 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!
Lire le mode d'emploi avant de commencer toute opération !
A conserver pour une utilisation ultérieure !
¡Leer el manual de instrucciones antes de comenzar cualquier trabajo!
¡Guardar el manual para una eventual consulta!

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i) 3
Contents
Contents
1. General information 5
2. Design and function 6
2.1 Description . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Dimensions in mm . . . . . . . . . . . . . . . . . . . . . 6
2.3 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . 9
3. Safety 9
3.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . 9
3.2 Intended use . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Improper use . . . . . . . . . . . . . . . . . . . . . . 10
3.4 Responsibility of the operator . . . . . . . . . . . . . . . . . 11
3.5 Personnel qualification . . . . . . . . . . . . . . . . . . . 11
3.6 Labelling, safety marks . . . . . . . . . . . . . . . . . . . 12
3.7 Ex marking . . . . . . . . . . . . . . . . . . . . . . . 13
4. Transport, packaging and storage 15
4.1 Transport. . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 Packaging and storage . . . . . . . . . . . . . . . . . . . 15
5. Commissioning, operation 16
5.1 Safety instructions for internally pressurised thermowells and measuring
instruments . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Electrical connection values . . . . . . . . . . . . . . . . . 17
5.2.1 Electrical data without built-in transmitter or digital display . . . . . 17
5.2.2 Electrical data with built-in transmitter or digital display . . . . . . 18
5.2.3 Electrical data with built-in transmitter in accordance with the
FISCO model . . . . . . . . . . . . . . . . . . . . 18
5.3 Tightening torques . . . . . . . . . . . . . . . . . . . . 18
5.3.1 Tightening torques between cable gland and connection head. . . . 18
5.3.2 Tightening torques between connection head and neck tube . . . . 18
6. Information on mounting and operation in hazardous areas (Europe) 19
6.1 General information on explosion protection . . . . . . . . . . . . 19
6.1.1 Special conditions of use (X conditions) . . . . . . . . . . . 20
6.2 Temperature class classification, ambient temperatures . . . . . . . . 21
6.3 Temperature carry-over from the process . . . . . . . . . . . . . 22

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i)4
Declarations of conformity can be found online at www.wika.com.
Contents
6.4 Mounting examples in hazardous areas . . . . . . . . . . . . . 23
6.4.1 Possible installation methods with the marking II 1G Ex ia IIC T6 Ga or
II 1D Ex ia IIIC T65 °C Da . . . . . . . . . . . . . . . . 23
6.4.2 Possible installation methods with the marking II 1/2 Ex ib IIC T6 Ga/Gb or
II 1/2 D Ex ib IIIC T65 °C Da/Db . . . . . . . . . . . . . . 24
7. Additional notes for instruments with EHEDG and 3-A 25
7.1 Compliance with 3-A conformity . . . . . . . . . . . . . . . . 25
7.2 Compliance with EHEDG conformity . . . . . . . . . . . . . . 25
7.3 Mounting instructions . . . . . . . . . . . . . . . . . . . 25
7.4 Cleaning in place (CIP) cleaning process . . . . . . . . . . . . . 25
8. Calculation examples for self-heating of the pipe body at the sensor
mounting point 26
9. Faults 27
10. Maintenance, cleaning and recalibration 29
10.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . 29
10.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . 29
10.3 Calibration, recalibration . . . . . . . . . . . . . . . . . . 29
11. Dismounting, return and disposal 30
11.1 Dismounting . . . . . . . . . . . . . . . . . . . . . . 30
11.2 Return . . . . . . . . . . . . . . . . . . . . . . . . 30
11.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . 30
12. Specifications 31
Annex 1: EU declaration of conformity 32
Appendix 2: EPL matrix 35

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i) 5
1. General information
■
The in-line resistance thermometer described in the operating instructions has been
manufactured using state-of-the-art technology. All components are subject to stringent
quality and environmental criteria during production. Our management systems are
certified 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. Pass
the operating instructions on to the next operator or owner of the instrument.
■
Skilled personnel must have carefully read and understood the operating instructions
prior to beginning any work.
■
The general terms and conditions contained in the sales documentation shall apply.
■
Subject to technical modifications.
■
Further information:
- Internet address: www.wika.de / www.wika.com
- Relevant data sheet: TE 60.25
- Application consultant: Tel.: [phone]
Fax: [phone]
[e-mail]
1. General information

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i)6
2. Design and function
2.1 Description
This resistance thermometer, through a wide variety of process connections, enables
trouble-free connection to many different processes.
3- or 4-wire platinum measuring resistors in accuracy classes A and B per DIN EN 60751
serve as sensors.
Transmitters built into the connection head are capable of making various output signals
available, for example 4 ... 20 mA or HART®protocol.
2.2 Dimensions in mm
■
Version with clamp connection
L
Connection head
Terminal block,
transmitter (option)
Pipe body
Ø Di
Ø D
14053685.01
Legend:
M Neck tube length
N (MH) Neck length
L Insertion length
Ø DiInner diameter of pipe
Ø D Clamp fitting
14027661.01
2. Design and function

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i) 7
2. Design and function
DN For pipe Dimensions PN 1)
2) 3)
Outer Ø x wall
thickness
Ø DiL Ø D
813.5 x 1.6 10.3 71 25.0 40
10 17.2 x 1.6 14.0 71 25.0 40
15 21.3 x 1.6 18.1 71 34.0 40
20 26.9 x 1.6 23.7 71 50.5 40
25 33.7 x 2 29.7 71 50.5 40
32 42.4 x 2 38.4 71 50.5 40
40 48.3 x 2 44.3 71 64.0 25
DN For pipe Dimensions PN 1)
2) 3)
Outer Ø x wall
thickness
Ø DiL Ø D
10 13 x 1.5 10 71 34 40
15 19 x 1.5 16 71 34 40
20 23 x 1.5 20 71 34 40
25 28 x 1 26 71 50.5 40
32 34 x 1 32 71 50.5 40
40 40 x 1 38 71 50.5 40
50 52 x 1 50 71 64.0 25
DN For pipe Dimensions PN 1)
2) 3)
Outer Ø x wall
thickness
Ø DiL Ø D
¾" 19.05 x 1.65 15.75 71 25 40
1" 25.4 x 1.65 22.1 71 50.5 40
1 ½" 38.1 x 1.65 34.8 71 50.5 40
2" 50.8 x 1.65 47.5 71 64.0 25
DN For pipe Dimensions PN 1)
2) 3)
Outer Ø x wall
thickness
Ø DiL Ø D
½" 12.7 x 1.6 9.5 71 25.0 40
¾" 19.05 x 1.6 15.85 71 25.0 40
1" 25.4 x 1.6 22.2 71 50.5 40
1 ½" 38.1 x 1.6 34.9 71 50.5 40
2" 50.8 x 1.6 47.6 71 64.0 25
Clamp per DIN 32676 for pipes per
DIN 11866 row B (ISO 1127)
Tri-clamp for pipes per BS4825 part 3
and O.D. tube
Clamp per DIN 32676 for pipes per
DIN 11866 row C (ASME BPE)
Clamp per DIN 32676 for pipes per
DIN 11866, row A
1) For maximum pressure range consider pressure rating of clamp.
2) Maximum operating temperature 150 °C
3) All thermowells of this series that are internally pressurised, with a nominal diameter (DN) greater than 25 mm, are
manufactured and tested to module H of the pressure equipment directive.

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i)8
■
Version with threaded connection
Thread per DIN 11851
14073164.01
Pipe inner
Ø Di
Thread Ø G
Insertion length L
Overall length LG
Thread per DIN 11864-1 form A for pipes
DIN 11866 row A
14073164.01
Pipe inner
Ø Di
Thread Ø G
Insertion length L
Overall length LG
Thread NEUMO BioConnect®
Thread Ø G
Insertion length L
14073164.01
Pipe inner Ø Di
Thread NEUMO BioConnect®
for pipes per DIN 11866 row A
NEUMO BioConnect®thread for pipes per
DIN 11866 row B (ISO 1127)
Flange connections, clamp connections and further
nominal widths on request.
2) Maximum operating temperature 150 °C
3) All thermowells of this series that are internally
pressurised, with a nominal diameter (DN) greater than
25 mm, are manufactured and tested to module H of the
pressure equipment directive.
DN For pipe Dimensions PN
2) 3)
Outer Ø x wall
thickness
Ø DiG L
15 19 x 1.5 16 M30 x 1.5 84 40
20 23 x 1.5 20 M36 x 2 84 40
25 29 x 1.5 26 M42 x 2 84 40
32 35 x 1.5 32 M52 x 2 84 40
40 41 x 1.5 38 M56 x 2 84 40
50 53 x 1.5 50 M86 x 2 84 25
65 70 x 2 66 M90 x 3 88 25
DN For pipe Dimensions PN
2) 3)
Outer Ø x wall
thickness
Ø DiG L
15 21.3 x 1.6 18.1 M30 x 1.5 84 40
20 26.9 x 1.6 23.7 M36 x 2 84 40
25 33.7 x 2 29.7 M42 x 2 84 40
32 42.4 x 2 38.4 M52 x 2 84 40
40 48.3 x 2 44.3 M56 x 2 84 25
50 60.3 x 2 56.3 M86 x 2 84 25
65 76.1 x 2.3 71.5 M90 x 3 88 16
DN For pipe Dimensions PN
2)
3)
Outer Ø x wall
thickness
Ø DiGLG L
10 13 x 1.5 10 Rd 28 x 1/8 84 76 40
15 19 x 1.5 16 Rd 34 x 1/6 84 76 40
20 23 x 1.5 20 Rd 44 x 1/6 84 72 40
25 29 x 1.5 26 Rd 52 x 1/6 84 70 40
32 35 x 1.5 32 Rd 58 x 1/6 84 70 40
40 41 x 1.5 38 Rd 65 x 1/6 84 70 40
50 53 x 1.5 50 Rd 78 x 1/6 84 70 25
65 70 x 2 66 Rd 95 x 1/6 88 72 25
DN For pipe Dimensions PN
2)
3)
Outer Ø x wall
thickness
Ø DiGLG L
10 13 x 1.5 10 Rd 28 x 1/8 84 76 40
15 19 x 1.5 16 Rd 34 x 1/8 84 76 40
20 23 x 1.5 20 Rd 44 x 1/6 84 74 40
25 29 x 1.5 26 Rd 52 x 1/6 84 72 40
32 35 x 1.5 32 Rd 58 x 1/6 84 70 40
40 41 x 1.5 38 Rd 65 x 1/6 84 70 40
50 53 x 1.5 50 Rd 78 x 1/6 84 70 25
65 70 x 2 66 Rd 95 x 1/6 88 72 25
2. Design and function

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i) 9
2.3 Scope of delivery
Cross-check scope of delivery with delivery note.
3. Safety
3.1 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 property or the environment, if not avoided.
DANGER!
... identifies hazards caused by electric power. Should the safety instructions
not be observed, there is a risk of serious or fatal injury.
DANGER!
... 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.
Information
... points out useful tips, recommendations and information for efficient and
trouble-free operation.
3.2 Intended use
Resistance thermometer for temperature measurement in processes with extremely high
hygienic requirements, in hazardous areas.These thermometers are used in applications
where a thermowell immersed into the process medium is not possible or not desired.
2. Design and function / 3. Safety

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i)10
The instrument has been designed and built solely for the intended use described here,
and may only be used accordingly.
The technical specifications contained in these operating instructions must be observed.
Improper handling or operation of the instrument outside of its technical specifications
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.
3.3 Improper use
WARNING!
Injuries through improper use
Improper use of the instrument can lead to hazardous situations and injuries.
▶
Refrain from unauthorised modifications to the instrument.
▶
The instrument should not be used for abrasive media.
Any use beyond or different to the intended use is considered as improper use.
Do not use this instrument in safety or emergency stop devices.
3. Safety

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i) 11
3.4 Responsibility of the operator
The instrument is used in the industrial sector. The operator is therefore responsible for
legal obligations regarding safety at work.
The safety instructions within these operating instructions, as well as the safety, accident
prevention and environmental protection regulations for the application area must be
maintained.
The operator is obliged to maintain the product label in a legible condition.
To ensure safe working on the instrument, the operating company must ensure
■
that suitable first-aid equipment is available and aid is provided whenever required.
■
that the operating personnel are regularly instructed in all topics regarding work safety,
first aid and environmental protection and know the operating instructions and in
particular, the safety instructions contained therein.
■
that the instrument is suitable for the particular application in accordance with its
intended use.
■
that personal protective equipment is available.
3.5 Personnel qualification
WARNING!
Risk of injury should qualification be insufficient!
Improper handling can result in considerable injury and damage to property.
▶
The activities described in these operating instructions may only be
carried out by skilled personnel who have the qualifications described
below.
▶
Keep unqualified personnel away from hazardous areas.
Skilled electrical personnel
Skilled electrical personnel are understood to be personnel who, based on their technical
training, know-how and experience as well as their knowledge of country-specific
regulations, current standards and directives, are capable of carrying out work on
electrical systems and independently recognising and avoiding potential hazards.The
skilled electrical personnel have been specifically trained for the work environment they
are working in and know the relevant standards and regulations.The skilled electrical
personnel must comply with current legal accident prevention regulations.
Special operating conditions require further appropriate knowledge, e.g. of aggressive
media.
3. Safety

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i)12
3. Safety
3.6 Labelling, safety marks
Product label (example)
Additional information for Ex instruments
Model
Year of manufacture
Serial number
Transmitter model (only for design with transmitter)
Information on version (measuring element, output signal, measuring range...)
Sensor in accordance with standard: F (thin-film measuring resistor)
Approval-related data
Before mounting and commissioning the instrument, ensure you read
the operating instructions!
  





EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i) 13
3.7 Ex marking
DANGER!
Danger to life due to loss of explosion protection
Non-observance of these instructions and their contents may result in the
loss of explosion protection.
▶
Observe the safety instructions in this chapter and further explosion
protection instructions in these operating instructions.
▶
Observe the information given in the applicable type examination
certificate and the relevant country-specific regulations for installation and
use in hazardous areas (e.g. IEC/EN 60079-10 and IEC/EN 60079-14).
Check whether the classification is suitable for the application. Observe the relevant
national regulations.
ATEX
IECEx
II 1G Ex ia IIC T3 ...T6 Ga
II 1/2G Ex ib IIC T3 ...T6 Ga/Gb
II 1D Ex ia IIIC T65 °C / T95 °C / T125 °C Da
II 1/2D Ex ib IIIC T65 °C / T95 °C / T125 °C Da/Db
For applications without transmitter (digital displays) requiring instruments of equipment
group II (potentially explosive gas atmospheres), the following temperature class
classification and ambient temperature ranges apply:
Table 1
Marking Tempera-
ture class
Ambient
temperature
range (Ta)
Max. surface temperature
(Tmax) at the probe or
thermowell tip
II 1G Ex ia IIC T6 Ga
II 1/2G Ex ib IIC T6 Ga/Gb
T6 (-50) 1) -40 ... +80 °C TM(medium temperature) +
self-heating
For this, the special conditions
(17) must be observed.
II 1G Ex ia IIC T5 Ga
II 1/2G Ex ib IIC T5 Ga/Gb
T5 (-50) 1) -40 ... +80 °C
II 1G Ex ia IIC T4 Ga
II 1/2G Ex ib IIC T4 Ga/Gb
II 1G Ex ia IIC T3 Ga
II 1/2G Ex ib IIC T3 Ga/Gb
T4, T3 (-50) 1) -40 ... +80 °C
1) The values in brackets apply to special designs.These probes are manufactured using special sealing
compounds. Moreover, they feature cases made of stainless steel and cable glands for low-temperature ranges.
3. Safety

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i)14
3. Safety
When there is a built-in transmitter and/or a digital display, the special conditions from the
type examination certificate (see item 17) apply.
For applications requiring instruments of equipment group II (potentially explosive dust
atmospheres), the following surface temperatures and ambient temperature ranges apply:
Table 2
Marking Power
Pi
Ambient
temperature
range (Ta)
Max. surface temperature
(Tmax) at the probe or
thermowell tip
II 1D Ex ia IIIC T65 °C Da
II 1/2D Ex ib IIIC T65 °C Da/Db
750 mW (-50) 1) -40 ... +40 °C TM(medium temperature) +
self-heating
For this, the special conditions
(17) must be observed.
II 1D Ex ia IIIC T95 °C Da
II 1/2D Ex ib IIIC T95 °C Da/Db
650 mW (-50) 1) -40 ... +70 °C
II 1D Ex ia IIIC T125 °C Da
II 1/2D Ex ib IIIC T125 °C Da/Db
550 mW (-50) 1) -40 ... +80 °C
1) The values in brackets apply to special designs.These probes are manufactured using special sealing
compounds. Moreover, they feature cases made of stainless steel and cable glands for low-temperature ranges.
When there is a built-in transmitter and/or a digital display, the special conditions from the
type examination certificate (see item 17) apply.
Use in methane atmospheres
Owing to the higher minimum ignition energy of methane, the instruments can also be
used where methane causes a potentially explosive gas atmosphere.The instrument can
optionally be marked with IIC + CH4.
For applications that require EPL Gb or Db, the instruments marked with “ia” can also be
used in type “ib” measuring circuits.

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i) 15
4. Transport, packaging and storage
4. Transport, packaging and storage
4.1 Transport
Check the instrument for any damage that may have been caused by transport.
Obvious damage must be reported immediately and damaged instruments must not be
used.
CAUTION!
Damage through improper transport
With improper transport, a high level of damage to property can occur.
▶
When unloading packed goods upon delivery as well as during internal
transport, proceed carefully and observe the symbols on the packaging.
▶
With internal transport, observe the instructions in chapter 5.2 “Packaging
and storage”.
4.2 Packaging and storage
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).
Permissible conditions at the place of storage:
■
Storage temperature: 0 ... 70 °C
■
Humidity: 35 ... 85 % relative humidity (non-condensing)
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
■
Hazardous environments, flammable atmospheres
Store the instrument in its original packaging in a location that fulfils 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 film.
2. Place the instrument, along with the 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.

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i)16
5. Commissioning, operation
DANGER!
Danger to life caused by electric current
Upon contact with live parts, there is a direct danger to life.
▶
The instrument may only be installed and mounted by skilled personnel.
▶
Operation using a defective power supply unit (e.g. short-circuit from the
mains voltage to the output voltage) can result in life-threatening voltages
at the instrument!
Mount the resistance thermometer from below when a horizontal pipeline is only partially
filled in operation.
Before commissioning the thermowell, clean it in accordance with the cleaning
specifications of the plant.
Use suitable sealing material.The sealing must be checked regularly by the plant manager.
Make sure that the thermowell is sufficiently grounded.
The thermowell must not be bent or altered in order to mount it.The fitting should be
carried out such that there can be no damage to the thermowell as a result of the plant
operation or the manager. If necessary, one of the thermowell/pipeline mountings
mentioned below (e.g. with pipe clamps) will be required. In particular, the neck should be
secured by appropriate methods against bending.
5.1 Safety instructions for internally pressurised thermowells and measuring
instruments
■
Before installation, the operator should perform the suitability test for the particular
application.
■
The thermowells and measuring instruments must be chemically and mechanically
resistant against the process media and must exhibit the same mechanical strength
(pressure rating) as the vessel or pipeline.
■
The thermowells and the measuring instruments are not suitable for abrasive media.
■
Assembly and disassembly must only be carried out once the system has been
depressurised. Beware of hot surfaces and residual media!
■
Please observe and follow the permissible pressure and temperature limits for operation
and the environment.
■
The permissible ambient temperature given by the manufacturer must not be exceeded.
■
The definition of appropriate maintenance and inspection intervals will depend on the
individual application and is to be defined by the operator.
■
Observe and follow the manufacturer´s specifications for installation, commissioning,
operation, maintenance and inspection.
■
To mount in line with the relevant thread standards, suitable bolts, screws, etc. must be
used.
■
To ensure the required sealing and trouble-free operation, appropriate sealings should
be used during mounting.
5. Commissioning, operation

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i) 17
5. Commissioning, operation
■
The assembly of the thermowells or measuring instruments to the vessel/pipeline
should be carried out so that it is permanently technically sealed.
■
Electrostatic discharges of the thermowells or measuring instruments when grounding
the vessel or pipeline should be eliminated.
5.2 Electrical connection values
5.2.1 Electrical data without built-in transmitter or digital display
For group II instruments (potentially explosive gas atmospheres) 3), the following maximum
connection values apply:
Ui= DC 30 V
Ii= 550 mA
Pi(at the sensor 1)) = 1.5 W
For group II instruments (potentially explosive dust atmospheres), the following maximum
connection values apply:
Ui= DC 30 V
Ii= 550 mA
Pi(at the sensor 2)) = For values, see “Table 2” (column 2), chapter 3.7 “Ex marking”
The internal inductance (Li) and capacitance (Ci) of the TR25 are negligibly small.
Sensor circuit in Ex ia or ib, IIC intrinsic safety ignition protection
Only for connection to intrinsically safe circuits with the following maximum output values
for group II instruments (potentially explosive gas atmospheres):
Uo= DC 30 V
Io= 550 mA
Po= 1.5 W
For group II instruments (potentially explosive dust atmospheres), the following maximum
output values apply to their connection to intrinsically safe circuits:
Uo= DC 30 V
Io= 550 mA
Po= For values, see “Table 2” (column 2), chapter 3.7 “Ex marking”
1) The permissible power to the sensor depends on the temperature of the medium TM, the temperature class
and the thermal resistance Rth, but shall not be more than 1.5 W.
Calculation examples see chapter 8 “Calculation examples for self-heating of the pipe body at the sensor
mounting point”.
2) The permissible power to the sensor depends on the temperature of the medium TM, the maximum
permissible surface temperature and the thermal resistance Rth, but shall not be more than the values
from “Table 2” (column 2), see chapter 3.7 “Ex marking”.
3) Use in methane atmospheres
Owing to the higher minimum ignition energy of methane, the instruments can also be used where
methane causes a potentially explosive gas atmosphere.The instrument can optionally be marked with IIC
+ CH4.

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i)18
5. Commissioning, operation
5.2.2 Electrical data with built-in transmitter or digital display
For the sensor circuit, the values mentioned in 8.1 apply.
Signal circuit in Ex ia or ib, IIC intrinsic safety ignition protection
Ui= depending on the transmitter/digital display
Ii= depending on the transmitter/digital display
Pi= in the case: Depending on the transmitter/digital display
Ci= depending on the transmitter/digital display
Li= depending on the transmitter/digital display
The transmitters and digital displays used must have their own certification in accordance
with IEC/EN.The installation conditions and electrical connection values can be seen from
the relevant approvals and must be observed.
5.2.3 Electrical data with built-in transmitter in accordance with the FISCO model
The transmitters/digital displays used for the application range in accordance with the
FISCO model are considered FISCO field instruments.The requirements in accordance
with IEC/EN 60079-27, and the connection conditions of the approvals in accordance with
FISCO, apply.
5.3 Tightening torques
5.3.1 Tightening torques between cable gland and connection head
■
Junction between cable gland and connection head
Thread Tightening torques
M20 x 1.5 12 Nm
■
Junction between cable and cable gland
Screw the pressure screw tightly into the adapter piece (use appropriate tools!)
5.3.2 Tightening torques between connection head and neck tube
Thread Tightening torques
Connection head material
Aluminium Stainless steel
M24 x 1.5 with pressure screw 27 Nm 30 Nm

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i) 19
6. Information on mounting and operation in hazardous areas
6. Information on mounting and operation in hazardous areas
(Europe)
6.1 General information on explosion protection
Follow the requirements of the ATEX and IEC directives.
Additionally the specifications of the respective national regulations
concerning use in hazardous areas apply.
A) The responsibility for classification of zones lies with the plant manager and not the
manufacturer/supplier of the equipment.
B) The plant manager guarantees, and is solely responsible, that all thermometers
in use are identifiable with respect to all safety-relevant characteristics. Damaged
thermometers may not be used. Repairs may only be carried out by authorised and
qualified personnel. Repairs may only be completed using original spare parts from the
original supplier; otherwise the requirements of the approval are not fulfilled.
The manufacturer shall not be responsible for constructional modifications after delivery
of the instruments.
C) If a component of electrical equipment, on which the explosion protection depends,
is repaired, then the electrical equipment may only be put back into use, after an
authorised expert has stated that it corresponds to the fundamental characteristics
of the requirements for explosion protection. In addition, this expert must provide a
certificate for this and provide the equipment with a test mark.
D) Item C) shall not apply if the component was repaired by the manufacturer in
accordance with the requirements and regulations.
E) When using transmitters and digital displays, the following must be observed:
- The contents of these operating instructions and those of the transmitter or display.
- The relevant regulations for installation and use of electrical systems.
- The regulations and guidelines regarding explosion protection.Transmitters and digital
displays must have their own approval.
F) When ordering spare parts, the parts that are to be replaced must be specified exactly:
■
Ignition protection type (here Ex i)
■
Approval no.
■
Order no.
■
Manufacturing no.
■
Order item

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i)20
6. Information on mounting and operation in hazardous areas
6.1.1 Special conditions of use (X conditions)
Versions with Ø < 3 mm or “grounded” versions are operationally non-compliant with
section 6.3.12 of IEC/EN 60079-11.Therefore, from a safety-relevant point of view, these
intrinsically safe circuits must be considered galvanically connected to the earth potential,
which is why equipotential bonding must be secured for the entire installation of the intrin-
sically safe circuits. In addition, for the connection, separate conditions in accordance with
IEC/EN 60079-14 must be observed.
Electrostatic charges must be avoided in instruments, that due to their design, do not
conform to the electrostatic requirements in accordance with IEC/EN 60079-0.
The transmitters and digital displays used must have their own certification in accordance
with IEC/EN.The installation conditions, electrical connection values, temperature classes
or maximum surface temperatures for use in potentially explosive dust atmospheres and
permissible ambient temperatures can be seen from the relevant approvals and must be
observed.
Thermal backflow from the process, that exceeds the permissible ambient temperature
of the transmitter, must not be allowed to occur. It must be prevented by installing suitable
heat insulation or a neck tube of suitable length.
If the wall thickness is below 1 mm, the instruments must not be subjected to ambient
stresses that may have an adverse effect on the partition. Alternatively, a thermowell of
suitable minimum wall thickness may be used.
When using a thermowell/neck tube, the overall instrument must be designed such that it
allows installation in a way that results in a sufficiently tight gap (IP67) or a flameproof gap
(IEC/EN 60079-1) towards the less hazardous area.
When cases are used, they must either have their own suitable approval or comply with the
minimum requirements. IP protection: At least IP20 (at least IP65 for dust), applies to all
cases. However, light metal cases must be qualified in accordance with IEC/EN 60079-0
section 8.1. In addition, non-metal cases or powder-coated cases must meet the require-
ments of IEC/EN 60079-0 or have a suitable warning note.
Protective measures for applications that require EPL Ga or Da:
Operationally based friction or impacts between light metal instrument components or their
alloys (e.g. aluminium, magnesium, titanium or zirconium) and instrument components
from iron/steel, are not permitted. Operationally based friction or impacts between light
metals are permitted.