WIKA TR12 Series Operating instructions

EN
DE
FR
ES
Additional operating instructions
Zusatz-Betriebsanleitung
Mode d’emploi complémentaire
Manual de instrucciones adicional
Additional operating instructions for hazardous areas (Ex d, Ex t)
Models TR12 and TC12
Zusatz-Betriebsaneleitung für explosionsgefährdete Bereiche
(Ex d, Ex t), Typen TR12 und TC12
Mode d’emploi complémentaire pour zones
explosives (Ex d, Ex t), types TR12 et TC12
Manual de instrucciones adicional para zonas potencialmente
explosivas (Ex d, Ex t), Modelos TR12 y TC12
Models TR12-B-xDxx, TC12-B-xDxx Models TR12-M-xDxx, TC12-M-xDxx
BVS 07 ATEX E 071 X
IECEx BVS 11.0042X

EN
DE
FR
ES
14280101.02 08/2023 EN/DE/FR/ES
2WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
Additional operating instructions
models TR12, TC12 (Ex d, Ex t)
Page
3 - 37
Zusatz-Betriebsanleitung Typen
TR12, TC12 (Ex d, Ex t)
Seite
38 - 54
Mode d’emploi complémentaire types
TR12, TC12 (Ex d, Ex t)
Page
55 - 82
Manual de instrucciones adicional
modelos TR12, TC12 (Ex d, Ex t)
Página
83 - 106
© 03/2019 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
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3WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
Contents
Contents
1. Ex marking 4
2. Safety 9
3. Commissioning, operation 15
4. Special conditions of use (X conditions) 24
5. Calculation examples for self-heating at the thermowell tip 25
Annex 1: EU declaration of conformity 27
Annex 2: WIKA ATEX and IECEx case and instrument list 28

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4WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
EN
1. Ex marking
DANGER!
Danger to life from explosion
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
instructions in these operating instructions.
▶
Follow the requirements of the ATEX directive.
▶
Observe the information given in the applicable type examination
certificate and the relevant regulations for installation and use in hazar-
dous areas (e.g. EN IEC 60079-0, IEC 60079-1, IEC 60079-10 and
IEC 60079-14).
Check whether the classification is suitable for the application. Observe the relevant
national regulations.
1. Ex marking
Supplementary documentation:
▶
This additional information for hazardous areas applies in conjunction with the
operating instructions “Resistance thermometer TR12 and thermocouple TC12”
(article number 14064370).

EN
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5WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
1. Ex marking
Series T*12-B-*DB or T*12-B-*DC (flameproof enclosure)
Variant 1: empty enclosure
Electri-
cal data
Marking Thermowell Temperatures
Temperature
class
Ambient
1)
U
max
= 30 V
II 2G Ex db IIC T*
2) 3)
Gb No T1 ...T5 -40 ... +85 °C
[-40 ... +185 °F]
-60 ... +85 °C
[-76 ... +185 °F]
II 1/2G Ex db IIC T*
2) 3)
Ga/Gb
Yes T1 ...T5 -40 ... +85 °C
[-40 ... +185 °F]
-60 ... +85 °C
[-76 ... +185 °F]
II 2G Ex db IIC T6
3)
Gb No T6 -40 ... +80 °C
[-40 ... +176 °F]
-60 ... +80 °C
[-76 ... +176 °F]
II 1/2G Ex db IIC T6
3)
Ga/Gb
Yes T6 -40 ... +80 °C
[-40 ... +176 °F]
-60 ... +80 °C
[-76 ... +176 °F]
1) The low ambient temperature of -40 °C [-40 °F] applies to models with Rosemount or Limatherm enclosures.The
low ambient temperature of either -40 °C [-40 °F] or -60 °C [-76 °F] applies to models with WIKA enclosures series
1/4000, 5/6000, 7/8000. For explanation of symbols for the low temperature range, see page 14.
2) The temperature class depends on the ambient temperature.
3) The maximum surface temperature (T
max
) at the tip of the probe or thermowell = T
p
(process temperature) +
self-heating. Refer to manual for calculation method.

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6WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
EN
Variant 2: empty enclosure + electronics
Electri-
cal data
Marking Thermowell Temperatures
Temperature
class
Ambient 1)
Umax = 30 V
Pmax = 2 W
II 2G Ex db IIC T* 2) 3) Gb No T1 ...T4 -40 ... +85 °C
[-40 ... +185 °F]
-60 ... +85 °C
[-76 ... +185 °F]
II 1/2G Ex db IIC T* 2) 3)
Ga/Gb
Yes T1 ... T4 -40 ... +85 °C
[-40 ... +185 °F]
-60 ... +85 °C
[-76 ... +185 °F]
II 2G Ex db IIC T5 3) Gb No T5 -40 ... +70 °C
[-40 ... +158 °F]
-60 ... +70 °C
[-76 ... +158 °F]
II 1/2G Ex db IIC T5 3) Ga/Gb Ye s T5 -40 ... +70 °C
[-40 ... +158 °F]
-60 ... +70 °C
[-76 ... +158 °F]
II 2G Ex db IIC T6 3) Gb No T6 -40 ... +55 °C
[-40 ... +131 °F]
-60 ... +55 °C
[-76 ... +131 °F]
II 1/2G Ex db IIC T6 3) Ga/Gb yes T6 -40 ... +55 °C
[-40 ... +131 °F]
-60 ... +55 °C
[-76 ... +131 °F]
1) The low ambient temperature of -40 °C [-40 °F] applies to models with Rosemount or Limatherm enclosures.The
low ambient temperature of either -40 °C [-40 °F] or -60 °C [-76 °F] applies to models with WIKA enclosures series
1/4000, 5/6000, 7/8000. For explanation of symbols for the low temperature range, see page 14.
2) The temperature class depends on the ambient temperature.
3) The maximum surface temperature (Tmax) at the tip of the probe or thermowell = Tp(process temperature) +
self-heating. Refer to manual for calculation method.
Variant 3: certified equipment (field transmitter)
Electri-
cal data
Marking Temperatures
Temperature class Ambient
See trans-
mitter 1)
II 2G Ex db IIC T* Gb 2) See transmitter 1) See transmitter 1)
1) The parameters for certified equipment (field transmitter) must be taken from the relevant manual.
2) The maximum surface temperature (Tmax) at the tip of the probe or thermowell = Tp(process temperature) +
self-heating. Refer to manual for calculation method.
1. Ex marking

EN
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7WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
Series T*12-B-*DG (flameproof and dustproof enclosure)
Variant 1: empty enclosure
Electri-
cal data
Marking Thermowell Temperatures
Temperature
class
Ambient 1)
Umax = 30 V
II 2G Ex db IIC T* 2) 3) Gb
II 2D Ex tb IIIC T* 3) Db
No T1 ...T5 -40 ... +85 °C
[-40 ... +185 °F]
-60 ... +85 °C
[-76 ... +185 °F]
II 1/2G Ex db IIC T* 2) 3)
Ga/Gb
II 2D Ex tb IIIC T* 3) Db
Yes T1 ... T5 -40 ... +85 °C
[-40 ... +185 °F]
-60 ... +85 °C
[-76 ... +185 °F]
II 2G Ex db IIC T6 3) Gb
II 2D Ex tb IIIC T* 3) Db
No T6 -40 ... +80 °C
[-40 ... +176 °F]
-60 ... +80 °C
[-76 ... +176 °F]
II 1/2G Ex db IIC T6 Ga/Gb
II 2D Ex tb IIIC T* 3) Db
Yes T6 -40 ... +80 °C
[-40 ... +176 °F]
-60 ... +80 °C
[-76 ... +176 °F]
1) The low ambient temperature of -40 °C [-40 °F] applies to models with Rosemount or Limatherm enclosures.The
low ambient temperature of either -40 °C [-40 °F] or -60 °C [-76 °F] applies to models with WIKA enclosures series
1/4000, 5/6000, 7/8000. For an explanation of symbols for the low temperature range, see page 14
2) The temperature class depends on the ambient temperature.
3) The maximum surface temperature (Tmax) at the tip of the probe or thermowell = Tp(process temperature) +
self-heating. Refer to manual for calculation method.
1. Ex marking

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8WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
EN
Variant 2: empty enclosure + electronics
Electri-
cal data
Marking Thermowell Temperatures
Temperature
class
Ambient 1)
Umax = 30 V
Pmax = 2 W
II 2G Ex db IIC T* 2) 3) Gb
II 2D Ex tb IIIC T* 3) Db
No T1 ...T4 -40 ... +85 °C
[-40 ... +185 °F]
-60 ... +85 °C
[-76 ... +185 °F]
II 1/2G Ex db IIC T* 2) Ga/Gb
II 2D Ex tb IIIC T* 3) Db
Yes T1 ... T4 -40 ... +85 °C
[-40 ... +185 °F]
-60 ... +85 °C
[-76 ... +185 °F]
II 2G Ex db IIC T5 3) Gb
II 2D Ex tb IIIC T* 3) Db
No T5 -40 ... +70 °C
[-40 ... +158 °F]
-60 ... +70 °C
[-76 ... +158 °F]
II 1/2G Ex db IIC T5 Ga/Gb
II 2D Ex tb IIIC T* 3) Db
Yes T5 -40 ... +70 °C
[-40 ... +158 °F]
-60 ... +70 °C
[-76 ... +158 °F]
II 2G Ex db IIC T6 3) Gb
II 2D Ex tb IIIC T* 3) Db
No T6 -40 ... +55 °C
[-40 ... +131 °F]
-60 ... +55 °C
[-76 ... +131 °F]
II 1/2G Ex db IIC T6 3) Ga/Gb
II 2D Ex tb IIIC T* 3) Db
yes T6 -40 ... +55 °C
[-40 ... +131 °F]
-60 ... +55 °C
[-76 ... +131 °F]
1) The low ambient temperature of -40 °C [-40 °F] applies to models with Rosemount or Limatherm enclosures.The
low ambient temperature of either -40 °C [-40 °F] or -60 °C [-76 °F] applies to models with WIKA enclosures series
1/4000, 5/6000, 7/8000. For an explanation of symbols for the low temperature range, see page 14.
2) The temperature class depends on the ambient temperature.
3) The maximum surface temperature (Tmax) at the tip of the probe or thermowell = Tp(process temperature) +
self-heating. Refer to manual for calculation method.
Variant 3: certified equipment (field transmitter)
Elec-
trical
data
Marking Temperatures
Temperature class Ambient
See
transmit-
ter 1)
II 2G Ex db IIC T* 2) 3) Gb
II 2D Ex tb IIIC T* 3) Db
See transmitter 1) See transmitter 1)
1) The parameters for certified equipment (field transmitter) must be taken from the relevant manual.
2) The temperature class depends on the ambient temperature.
3) The maximum surface temperature (Tmax) at the tip of the probe or thermowell = Tp(process temperature) +
self-heating. Refer to manual for calculation method.
1. Ex marking

EN
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9WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
When there is a built-in transmitter and/or a digital indicator, the special conditions from
the type examination certificate ,see chapter 4 “Special conditions of use (X conditions)”
apply.
2. Safety
2.1 Explanation of symbols
DANGER!
... indicates a potentially dangerous situation in the hazardous area that
can result in serious injury or death, if not avoided.
2.2 Intended use
Thermometers of this series are suitable for temperature measurement in zone 1 hazar-
dous areas. If the thermometer is installed in a thermowell, it is suitable for zone 21, for
zone separation between zones 20 and 21 or zone separation between zones 0 and 1.
Possible sensor measuring ranges: -196 ... +1,200 °C [-321 ... +2,192 °F].The selection
of the suitable thermowell material, dependent on the medium to be measured, must
be ensured by the operator.The replaceable, centrically spring-loaded measuring insert
and its extended spring travel enable combination with the widest range of connection
head designs.
Technical description models series T*12-B-*DB or T*12-B-*DC (flameproof
enclosure)
The electrical thermometers TR12-B-*DB, TR12-B-*DC (resistance thermome-
ters) respectively TC12-B-*DB, TC12-B-*DC (thermocouple) are made of a module
TR12-M-*D* or TC12-M-*D* which is fitted to an Ex d certified enclosure.The module
consists of a spring-loaded measuring insert TR12-A-*** or TC12-A-*** installed in a
flameproof neck tube.The measuring insert in combination with the neck tube works as
a flameproof joint.The measuring insert of the standard variants is exchangeable and
suitable to fit in a thermowell.
Variants according to drawing 14207105 are designed to install directly into the process.
The measuring insert of those variants is not exchangeable.
The probe part of the measuring insert is made of a welded tube or mineral-insulated
cable.The temperature sensor is embedded in ceramic powder, a temperature-resistant
potting compound, a cement compound or thermal compound.
If the temperature sensor is designed as grounded thermocouple, the wires of the
thermocouple are in direct contact with the sheath. Models with diameters smaller than
3 mm [0.12 in] as well as grounded thermocouples shall be considered as galvanically
connected to the ground potential.
1. Ex marking / 2. Safety

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10 WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
EN
The connection side of the measuring insert consists of a welded sleeve (transition)
including the attached connection wires.
The thermometers model TR12-M-*DB, TR12-M-*DC, TC12-M-*DB or TC12-M-*DC
will be fitted to an Ex d and Ex t certified enclosure in accordance with IECEX TUN
18.0010U or TÜV 18 ATEX 211394 U manufactured by WIKA series 1/4000, 7/8000 or
5/6000.The enclosure and covers are made of stainless steel or aluminium. The cover
could be optionally provided with a glass lens (window).
Alternatively, the thermometers can be fitted to other certified cases or assemblies, so
long as they are listed in the “WIKA ATEX and IECEx Ex d and Ex t case and instrument
list” article no.: 14011281.08 ,see „Annex 2:WIKA ATEX and IECEx case and instru-
ment list“.
3 different variants of process thermometers model T*12-B-*DB or T*12-B-*DC are
available:
■
Variant 1:The thermometer (module) model TR12-M-*D* or TC12-M-*D* is fitted to a
certified empty enclosure in the ignition protection type “flameproof enclosure”.Termi-
nals are mounted inside the case.
■
Variant 2:The thermometer (module) model TR12-M-*D* or TC12-M-*D* is fitted to
a certified empty enclosure in the ignition protection type “flameproof enclosure”.
Electronic equipment is mounted inside the case.
■
Variant 3:The thermometer (module) model TR12-M-*D* or TC12-M-*D* is fitted to
a certified equipment (field transmitter) in the ignition protection type “flameproof
enclosure”.
The modules TR12-M-*DB, TR12-M-*DC, TC12-M-*DB or TC12-M-*DC are designed
to fit to an Ex d certified enclosure by the end user.The module is marked without a
temperature class, either II 2G Ex db IIC Gb or II 1/2G Ex db IIC Ga/Gb. All conditions
and limitations as described for variants 1 to 3 apply to this combined equipment. The
responsibility rests with the operator.
2. Safety

EN
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11WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
2. Safety
Technical description models series T*12-B-*DG (flameproof and dustproof
enclosure)
The electrical thermometers, TR12-B-*DG (resistance thermometer) and
TC12-B-*DG (thermocouple) respectively, are made from a TR12-M-*D* or TC12-M-*D*
module which is fitted to an Ex d and Ex t certified enclosure.The module consists of a
spring-loaded measuring insert TR12-A-*** or TC12-A-*** installed in a flameproof neck
tube.The measuring insert in combination with the neck tube works as a flameproof
joint.The measuring insert of the standard variants is exchangeable and suitable to fit in
a thermowell.
Special variants for direct installation in the process, without an exchangeable measu-
ring insert, are available on request.
The probe part of the measuring insert is made of a welded tube or a mineral-insulated
cable.The temperature sensor is embedded in ceramic powder, a temperature-resistant
potting compound, a cement compound or thermal compound.
If the temperature sensor is designed as grounded thermocouple, the wires of the
thermocouple are in direct contact with the sheath. Models with diameters smaller than
3 mm [0.12 in] as well as grounded thermocouples shall be considered as galvanically
connected to the ground potential.
The connection side of the measuring insert consists of a welded sleeve (transition)
including the attached connection wires.
The thermometers model TR12-M-*DG or TC12-M-*DG will be fitted to an Ex d and Ex
t certified enclosure in accordance with IECEX TUN 18.0010U or TÜV 18 ATEX 211394
U manufactured by WIKA series 1/4000, 7/8000 or 5/6000. The enclosure and covers
are made of stainless steel or aluminium.The cover could be optionally provided with a
glass lens (window).
Alternatively the thermometers will be fitted to other certified enclosures or assemblies
as listed in the “WIKA ATEX and IECEx Ex d and Ex t case and instrument list” article
no.: 14011281.08 (refer to manufacturer’s documents for details).
3 different variants of process thermometers model T*12-B-*DG are available:
■
Variant 1:The thermometer (module) model TR12-M-*D* or TC12-M-*D* is fitted to
a certified empty enclosure in the ignition protection type “flameproof enclosure” and
“dust ignition protection”.Terminals are mounted inside the case.
■
Variant 2:The thermometer (module) model TR12-M-*D* or TC12-M-*D* is fitted to
a certified empty enclosure in the ignition protection type “flameproof enclosure” and
“dust ignition protection”. Electronic equipment is mounted inside the case.
■
Variant 3:The thermometer (module) model TR12-M-*D* or TC12-M-*D* is fitted to
a certified equipment (field transmitter) in the ignition protection type “flameproof
enclosure” and “dust ignition protection”.

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12 WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
EN
The modules TR12-M-*DG or TC12-M-*DG are designed to fit to an Ex d and Ex t
certified enclosure by the end user.The module is marked without temperature class,
II 2G Ex db IIC and II 2D Ex tb IIIC or 1/2G Ex db IIC Ga/ Gb and II 2D Ex tb IIIC Db. All
conditions and limitations described for the variants 1 to 3 also apply to this combined
equipment.The responsibility rests with the operator.
2.3 Responsibility of the operator
The responsibility for classification of zones lies with the plant manager and not the
manufacturer/supplier of the equipment.
2.4 Personnel qualification
The skilled electrical personnel must have knowledge of ignition protection types,
regulations and provisions for equipment in hazardous areas.
2. Safety

EN
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13WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
2.5 Labelling, safety marks
DANGER!
Danger to life caused by electric current
Upon contact with live parts, there is a direct danger to life.
▶
Do not open the instrument while under voltage.
CAUTION!
Damage to property due to electrostatic discharge (ESD)
When working on open electric circuits (PCBs) there is a risk of damaging
sensitive electronic components through electrostatic discharge.
▶
The correct use of grounded working surfaces and personal armbands
is required.
Product label (example)
Model
A = Measuring insert
B = Process thermometer
M = Basic module
Serial number
Approval-related data
Year of manufacture
TR12-M-IIBZ
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 db 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
TR12-B-IDBZ
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 db 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
TC12-B-IDBZ
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 db IIC T* Gb
EN 60584-1
0158
WIKA Alexander Wiegand SE & Co.KG, D-63911 Klingenberg
Made in Germany 2013 WARNING: DO NOT OPEN WHILE ENERGIZED!
11012345
TR12-M-IDK*
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 db 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



 

2. Safety

■
Information on version (measuring element, measuring
range...)
Sensor in accordance with standard (resistance thermo-
meter)
- F = Thin-film measuring resistor
- W = Wire-wound measuring resistor
Sensor in accordance with standard (thermocouple)
- Ungrounded = Ungrounded welded
- Grounded = Welded to the sheath (grounded)
- Quasi grounded
= The thermometer is, due to its low
insulation clearances between
resistance sensor and sheath, to
be considered as grounded.
■
Transmitter model (only for design with transmitter)

14280101.02 08/2023 EN/DE/FR/ES
14 WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
EN
Before mounting and commissioning the instrument, ensure you
read the operating instructions!
Additional product label
Approval-related data
ATEX/IECEx: Minimum permissible ambient temperature -60 °C [-76 °F]
In this case, the usability of the instrument is indicated by a snowflake symbol.
For application in areas with high or repeated charging processes, special protective
measures must be taken.
TR10-B
1 x Pt100 / B / 3 (F) -50 ... +250 °C
IEC 60751
Made in Germany 2014
1102AB12
T32.1S.0NI 4 ... 20 mA -50 ... +250 °C
D-63911 Klingenberg
HART ®
TR10-A-IICZ
1102AB12
1 x Pt100 / B / 3
-50 ... +250 °C
D = 6 mm
525 mm
(F)
D-63911 Klingenberg
IEC 60751
II 3G Ex nA IIC T1 ... T6 Gc X
WARNING! DO NOT OPEN WHILE ENERGISED!
II 3G Ex nA IIC T1 ... T6 Gc X
II 3D Ex tc IIIC T440°C ... T80°C Dc X
Tamb T6/T5/T4-T1: -20 ... +55/+70/+80 °C
Tamb T80/95/130-440°C: -20 ... +55/+70/+80 °C
L = 1 µH/m, C = 200 pF/m
Made in Germany 2014
WARNING! POTENTIAL ELECTROSTATIC CHARGING HAZARD!
II 3G Ex nA IIC T1 ... T6 Gc X
II 3D Ex tc IIIC T440°C ... T80°C Dc X
Tamb T6/T5/T4-T1: -20 ... +55/+70/+80 °C
Tamb T80/95/130-440°C: -20 ... +55/+70/+80 °C
L = 1 µH/m, C = 200 pF/m
Ex n / Ex d
Ex i
EAC (landesspezifisches Zusatzschild)
ΒΗИМАНИЕ!
ПОТЕНЦИАЛЬНЫЙ РИСК НАКОПЛЕНИЯ
ЭЛЕКТРОСТАТИЧЕСКОГО ЗАРЯДА!
СДЕЛАНО В ГЕРМАНИИ

2. Safety

EN
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15WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
3. Commissioning, operation
DANGER!
Danger to life from explosion
Through working in flammable atmospheres, there is a risk of explosion
which can cause death.
▶
Only carry out set-up work in non-hazardous environments!
▶
Do not open the instrument while under voltage.
DANGER!
Danger to life from explosion
By using a measuring insert without a suitable connection head (case), an
explosion risk occurs which can cause fatalities.
▶
Only use the measuring insert in the connection head designed for it.
DANGER!
Danger to life from explosion
Non-observance of the permissible thread gaps and the corresponding
tightening torques can lead to the loss of explosion protection.
▶
Ensure the number of threads engaged in accordance with chapter 3.6
„Thread gap“ and the corresponding chapter of the TR12/TC12 opera-
ting instructions with article number 14064370.
Observe the special conditions, see chapter 4 „Special conditions of use (X condi-
tions)“.
3.1 Mechanical mounting
With preassembled connection heads, the direct threaded connection of the thermome-
ter to the connection head or case must not be twisted or opened. Any alignment of the
case may only be made using the optional “nipple-union-nipple” neck tube.
Certified and listed field cases (variant 3) should only be fitted and installed by a skilled
person trained to the latest technological standards.
Removal and installation of the measuring insert
Before opening the instrument, isolate it from any voltage and loosen the locking
screw of the cover (see chapter 5.2). During the replacement of the measuring insert,
the surfaces of the flameproof joint must not be damaged. Scratches, grooves, dents,
bumps etc. are not permissible.The joint lengths and the joint widths of the flameproof
joint must not be changed.
For a detailed description of removal and installation, see the TR12/TC12 operating
instructions with article number 14064370.
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16 WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
EN
3.2 Locking screw
Always tighten the locking screw to prevent unintended
opening of the head with flameproof enclosure.
Before opening the head, always loosen the locking screw
sufficiently.
3.3 Electrical mounting
■
For the installation of the thermometer, only components (e.g. cables, cable glands,
etc.) permitted for “flameproof enclosure” and if applicable “protection by enclosure“
may be used.
■
Use of a transmitter/digital indicator (option):
Observe the contents of these operating instructions and those of the transmitter/
digital display, see scope of delivery. Observe the relevant regulations for installation
and use of electrical systems, and also the regulations and guidelines for explosion
protection.
■
The temperature resistance of the connection leads, the connection heads, the
cable entries and if necessary the blanking elements shall be at least as high as
the maximum permissible ambient temperature and shall be at least as low as the
permissible ambient temperature.
■
Do not fit any batteries into the case.
■
Mounting in metal vessel:
The case must be grounded against electromagnetic fields and electrostatic
charging. It must not be connected separately to the equipotential bonding system.
It is sufficient if the metal thermowell has a solid and secured contact with the metal
vessel or its structural components or pipelines, so long as these components are
connected to the equipotential bonding system.
■
Fitting in non-metal vessels:
All electrically conductive thermometer components within the hazardous area must
be provided with equipotential bonding.
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17WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
3.4 Safety-related instructions for the different variants
T4: (-60) -40 °C < Ta< +80 °C
[(-76) -40 °F < Ta< +176 °F]
T3 (-60) -40 °C < Ta< +150 °C
[(-76) -40 °F < Ta< +176 °F]
T1 (-60) -40 °C < Ta< +300 °C
[(-76) -40 °F < Ta< +176 °F]
TR12-B, TC12-B
Variant 1
TR12-B, TC12-B
Variant 2
TR12-B, TC12-B
Variant 3
Thread
TR12-M, TC12-M
Module 1)
Thread
Thread Thread Thread
Legend:
Connection head
Neck tube
Connection to thermowell/
protection tube
Measuring insert
Terminal block
Transmitter (option)
Field transmitter
14039769.01
T4
T3
T1
Tundefined
1) Operation without a suitable case is not permitted.
3.4.1 Variant 1
The thermometer (module) model TR12-M or TC12-M is fitted to a certified empty
enclosure in the ignition protection type “flameproof enclosure” and optionally with “dust
ignition protection”.Terminals are mounted inside the case.
The position of the identification label for the complete assembly TR12-B or TC12-B is
on the enclosure respectively connection head. The module is labeled as part of TR12-B
or TC12-B and with a serial number on the neck tube.
Variant 1, use in zone 1 or 21
If the TR12-B or TC12-B thermometer is marked with II 2G Ex db IIC T1 ... T6 Gb, then it
is designed for use in zone 1.
If the TR12-B or TC12-B thermometer is marked with II 2G Ex db IIC T1 ... T6 Gb and
II 2D Ex tb IIIC T* Db then it is designed for use in zone 1 or zone 21.
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18 WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
EN
Variant 1, use at the partition to zone 0
If the thermometer TR12-B or TC12-B is marked with II 1/2G Ex db IIC T1 ... T6 Ga/Gb,
then it is designed for use with a thermowell at the partition to zone 0.The flameproof
enclosure or connection head is located either in zone 1 or zone 2. The sensor is within
a thermowell which protrudes into zone 0 via a process connection.
The thermometer should therefore be operated with a power limitation circuit.
Pmax: 2 W
Umax: 30 V
A power supply unit with a suitable limitation or a fuse has to be installed in the supply
circuit as an energy-limiting method.
A power supply unit with Ex ia circuitry fulfils these conditions, but is not required if the
limits can be achieved through other measures.The responsibility rests with the opera-
tor.
A heating in the connection head does not occur with variant 1. However, an impermis-
sible heat backflow from the process which can exceed the operating temperature of the
case or the temperature class, must be prevented through suitable heat insulation or a
suitably long neck tube.
3.4.2 Variant 2
The thermometer (module) TR12-M or TC12-M is fitted to a certified empty enclosure
in the ignition protection type “flameproof enclosure” and optionally with “dust ignition
protection”. Electronic equipment is mounted inside the case.
The position of the identification label for the complete assembly TR12-B or TC12-B is
on the enclosure respectively connection head. The module is labeled as part of TR12-B
or TC12-B and with a serial number on the neck tube.
Variant 2, use in zone 1 or 21
If the TR12-B or TC12-B thermometer is marked with II 2G Ex db IIC T1 ... T6 Gb, then it
is designed for use in zone 1.
If the TR12-B or TC12-B thermometer is marked with II 2G Ex db IIC T1 ... T6 Gb and
II 2D Ex tb IIIC T* Db, then it is designed for use in zone 1 or zone 21.
Variant 2, use at the partition to zone 0
If the thermometer TR12-B or TC12-B is marked with II 1/2G Ex db IIC T1 ... T6 Ga/Gb,
then it is designed for use with a thermowell at the partition to zone 0.
The flameproof enclosure or connection head is located either in zone 1 or zone 2.The
sensor is within a thermowell which protrudes into zone 0 via a process connection.
The thermometer should therefore be operated with a power limitation circuit.
Pmax: 2 W
Umax: 30 V
A power supply unit with a suitable limitation or a fuse has to be installed in the supply
circuit as an energy-limiting method.
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19WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
A power supply unit with Ex ia circuitry fulfils these conditions, but is not required if
the limits can be achieved through other measures.The responsibility rests with the
operator. WIKA recommends realizing the power limitation through a suitable fuse in the
4 ... 20 mA circuit 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.
Variant 2, example for calculating the fuse for a maximum power at the sensor of
0.8 W:
The internal resistance of thermocouples is significantly lower than the thermal resis-
tance of a Pt100 sensor, so the much less favourable case for a resistance thermometer
has been calculated.
Pmax = (1.7 x Is)² x Rw
Is= Fuse rating
Pmax = 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
This results in the following fuse rating:
Is= sqrt (Pmax / 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.
Variant 2, example for calculating the fuse for a maximum power at the sensor of
0.5 W:
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 [0.24 in] TC measuring inserts: approx. 1.2 Ω/m
Internal resistance of Ø 3 mm [0.12 in] TC measuring inserts: approx. 5.6 Ω/m
These measured values are valid for room temperature.
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20 WIKA additional operating instructions TR12/TC12, flameproof enclosure (Ex d, Ex t)
EN
Variant 2, temperature increase on the surface of the connection head
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 case is less than
25 K if the following conditions are observed: voltage supply UBmaximum DC 30 V
when the transmitter is operated in a current limitation of 22.5 mA.
A heating in the connection head can occur with variant 2 through faulty electronics.The
permissible ambient temperatures depend on the case used and any additionally fitted
head-mounted transmitter.
However, an impermissible heat backflow from the process which can exceed the
operating temperature of the transmitter or the case, must be prevented through suitable
heat insulation or a suitably long neck tube.
3.4.3 Variant 3
The thermometer (module) TR12-M or TC12-M is fitted to a certified equipment (field
transmitter) in the ignition protection type “flameproof enclosure” and optionally with
“dust ignition protection”.
The position of the identification label for the complete assembly TR12-B or TC12-B is
on the neck tube.The original marking of the field transmitter remains unchanged.
Variant 3, use in zone 1 or 21
If the TR12-B or TC12-B thermometer is marked with II 2G Ex db IIC T* Gb, then it is
designed for use in zone 1.
If the TR12-B or TC12-B thermometer is marked with II 2G Ex db IIC T* Gb and
II 2D Ex tb IIIC T* Db, then it is designed for use in zone 1 or zone 21.
Variant 3, use at the partition to zone 0
For any potential usage at the partition to zone 0 with a thermowell, the approvals and
conditions of the relevant transmitters must be considered. Only field transmitters listed
by name in the Annex (“WIKA ATEX and IECEx Ex d and Ex t case and instrument list”
article no.: 14011281.08) of the Ex d and Ex t certificate may be used.
3.4.4 Modules TR12-M or TC12-M
The module (respectively thermometer) TR12-M or TC12-M consists of a spring-loaded
measuring insert TR12-A or TC12-A installed in a flameproof neck tube.The measuring
insert in combination with the neck tube works as a flameproof joint.The measuring
insert of the standard variants is exchangeable and suitable to fit in a thermowell.
The modules are designed to fit to an Ex d and optionally Ex t certified enclosure by the
end user.
3. Commissioning, operation