Kobold TWL User manual

Operating Instructions
for
Temperature Sensor
Model: TWL
Explosion Proof Protection Ex d

TWL
page 2 DT0454
1 Contents
1Contents ...................................................................................................................... 2
2Note ............................................................................................................................. 4
3Instrument Inspection .................................................................................................. 4
4Regulation Use ............................................................................................................ 4
5Operating Principle ...................................................................................................... 5
6Electrical connection ................................................................................................... 5
7Use in hazardous Areas .............................................................................................. 8
7.1Area of validity ...................................................................................................... 8
7.2Guidelines ............................................................................................................. 8
7.3General ................................................................................................................. 8
7.4Protection against E.S.D. (Electrostatic Discharge) .............................................. 9
7.5Maintenance and repairs ...................................................................................... 9
7.6Storage ................................................................................................................. 9
8Description of the Factory Label ................................................................................ 10
Examples of installation in explosion-proof areas conform to the protection type “Ex
d” ............................................................................................................................. 10
9Installation in the classified area ................................................................................ 11
9.1Examples of installation in explosion-proof areas conform to the protection type
“Ex d” ........................................................................................................................ 11
10Technical Details ..................................................................................................... 12
10.1Sensor wiring .................................................................................................... 12
10.2General details .................................................................................................. 12
10.3Materials ........................................................................................................... 12
10.4Process connection .......................................................................................... 13
10.5ATEX-approval .................................................................................................. 13
10.6Head transmitter ............................................................................................... 13
10.7Display .............................................................................................................. 14
11Dimensions .............................................................................................................. 15
11.1Sensors ............................................................................................................. 15
11.2Thermowells ...................................................................................................... 16
11.3Lagging extension at thermowell “T”. ................................................................ 22
12Order details ............................................................................................................ 23
13EU-Certificates ........................................................................................................ 25
14ATEX-Certificates .................................................................................................... 26

TWL
DT0454 page 3
Manufactured by:
Kobold Mesura S.L.U
Avda Conflent Nº68 Nave 15
08915 Badalona
Tel.: [phone]
Fax: [phone]
E-Mail: [e-mail]
www.kobold.com
Edition May 2022

TWL
page 4 DT0454
2 Note
Please read these operating instructions before unpacking and putting the unit in
operation. Follow the instructions precisely as described herein.
The instruction manuals on our website WWW.kobold.com are always for currently
manufactured version of our products. Due to technical changes, the instruction
manuals available online may not always correspond to the product version you
have purchased. If you need an instruction manual that correspond to the
purchased product version, you can request it from us free of charge by email
([email protected]) in PDF format, specifying the relevant invoice number and
serial number. If you wish, the operating instructions can also be sent to you by
post in paper form against an applicable postage fee.
The devices are only to be used, maintained and serviced by persons familiar with
these operating instructions and in accordance with local regulations applying to
Health & Safety and prevention of accidents.
When used in machines, the measuring unit should be used only when the
machines fulfil the EC-machine guidelines.
3 Instrument Inspection
Instruments are inspected before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of the
delivery packaging. In case of damage, please inform your parcel service /
forwarding agent immediately, since they are responsible for damages during
transit.
Scope of delivery:
The standard delivery includes:
 Device model: TWL
4 Regulation Use
The temperature sensors of series TWL are suitable for all applications where
processes involving fluids, solid bodies or materials, or gases, require temperature
recording and measurement. Our temperature sensors are suitable for use in the
following industrial areas: chemicals, petrochemicals, water, feed, food, sanitary,
etc.
Any use of the Temperature Sensor, model: TWL, which exceeds the
manufacturer’s specification may invalidate its warranty. Therefore, any resulting
damage is not the responsibility of the manufacturer. The user assumes all risk for
such usage.

TWL
DT0454 page 5
5 Operating Principle
Resistance thermometers work by using the continuous change of resistance of
metals subject to temperature rising and decreasing. The most common resistance
material used is platinum, as it is very stable and has very good repeatability. The
temperature coefficient of platinum is positive, so its resistance increases as the
temperature rises. This property is defined in the IEC751 standard, which defines
measurements deviations categories A and B.
6 Electrical connection
6.1 Sensor wiring diagram with head

TWL
page 6 DT0454
6.2 Transmitter wiring diagram

TWL
DT0454 page 7
7 Use in hazardous Areas
7.1 Area of validity
These security instructions apply to TWL Series temperature sensors and their
accessories for use in explosion-proof atmospheres conform to CE certificate
LOM 08ATEX2016 X
7.2 Guidelines
The TWL Series temperature measuring instruments work according to the heat
resistance measuring principle. This measuring principle acts to check and
measure the temperature also in explosion-proof areas.
TWL devices can be with a standard 4 to 20 mA signal transmitter, Hart protocol,
Profibus/Fieldbus or with direct access to the sensor. They are appropriate for use
in Group IIC and Categories 2G/D explosion-proof atmospheres.
The sensor element can be installed in Category 2 explosion-proof areas in
accordance with Certification 2G Ex d. The mechanical connecting element to the
process can be installed in Category 2 explosion-proof areas, conform to
Certification 2G Ex d.
Devices labelled “Ex d” which have a mechanical separating element, such
as a thermowell, are approved for Zone 0/20 to Zone 1/21, when using a
sensor certified as 2GD.
The temperature class and/or the surface temperature relates solely to a device
operated at ambient temperature. On installation the actual temperature class for
process operation must be determined.
The inlet bushings used must conform to the certification for their type in
accordance with the directive.
The requirements of Regulation 2014/34/EU, and the applicable national
regulations for the use of measuring instruments in explosion-proof areas, such as
EN 60079-0, EN 60079-1, EN 60079-31 and other regulations relating to this
certification type, must be fulfilled.
Only qualified specialist personnel may install devices in explosion-proof areas.
7.3 General
 When installing the sensor, it is necessary to follow all the instructions
and regulations for explosion-proof areas and the safety instructions included in
these instructions.
 Make sure that the details on the sensor’s type label correspond to the
working conditions for the application.

TWL
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 When installing the device, make sure you do not create any mechanical
deformation as a result of solder spots or the application of mechanical force.
 Important: Make sure there is an electrical connection between the
device’s earth and the earth of the system.
Make sure the lid is closed before putting the device into operation.
 Before re-opening the lid, remove the plug from the mains or de-energise
the device and make sure there is no danger of explosion.
 Only use cable glands according to norms for Ex d protection.
 Important: Due to the use of a flame path and its fit tolerance it is not
permissible to use standard measuring inserts as spare parts
 The use in zone 0 of heads made of aluminium should be restricted to
locations where the risk of ignition due to mechanical impact is not possible.
7.4 Protection against E.S.D. (Electrostatic Discharge)
Temperature sensors with plastic parts that can become electrically charged bear
a warning label. Electrical charging must be avoided at all costs. Pay attention to
the following:
- Avoid rubbing the device
- Never clean the device dry
- Do not install the device near material airflows or near steam outlets
7.5 Maintenance and repairs
The instrument does not require maintenance or servicing.
Repairs must be only carried out by Kobold Mesura (manufacturer)
7.6 Storage
Measuring instruments should be protected against humidity and dust.
Storage temperature: -40ºC….+85ºC for sensors without transmitter.
Storage temperature: See manual of the corresponding transmitter and display
model.

TWL
DT0454 page 9
8 Description of the Factory Label
Installation in the classified area
Examples of installation in explosion-proof areas conform to the protection
type “Ex d”

TWL
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9 Installation in the classified area
9.1 Examples of installation in explosion-proof areas conform to the
protection type “Ex d”
Hazardous area Safe area