D
GB
Operating instructions
Betriebsanleitung
Mode d'emploi
Manual de instrucciones
E
F
Model TGT73.100
Gas-actuated thermometer with electrical output
signal, model TGT73
Gasdruck-Thermometer mit elektrischem
Ausgangssignal, Typ TGT73
Thermomètre à dilatation de gaz avec signal de sortie
électrique, type TGT73
Termómetro de dilatación de gas con señal de salida
eléctrica, modelo TGT73
2
D
GB
E
F
Operating instructions model TGT73
Page 3 - 24
Betriebsanleitung Typ TGT73
Seite 25 - 44
Mode d'emploi type TGT73
Page 45 - 66
Manual de instrucciones modelo TGT73
Página 67 - 86
© 2012 WIKA Alexander Wiegand SE & Co. KG
All rights reserved. / Alle Rechte vorbehalten.
WIKA
®
is a registered trademark in various countries.
WIKA
®
ist eine geschützte Marke in verschiedenen Ländern.
Prior to starting any work, read the operating instructions!
Keep for later use!
Vor Beginn aller Arbeiten Betriebsanleitung lesen!
Zum späteren Gebrauch aufbewahren!
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!
14028755.02 08/2012 GB/D/F/E
WIKA operating instructions model TGT73
GB
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WIKA operating instructions model TGT73 3
Contents
1. General information 4
2. Safety 6
3. Specications 8
4. Design and function 10
5. Transport, packaging and storage 11
6. Commissioning, operation 13
7. Mounting instructions for contact bulb 16
8. Electrical connection 18
9. Maintenance and cleaning 19
10. Faults 20
11. Dismounting, return and disposal 21
Appendix 1: EC declaration of conformity 23
Contents
Declarations of conformity can be found online at www.wika.com.
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4 WIKA operating instructions model TGT73
1. General information
■
The intelliTHERM model TGT73 gas-actuated thermometer
described in these operating instructions has been designed and
manufactured using state-of-the-art technology. All components
are subject to stringent quality and environmental criteria during
production. Our management systems are certied to ISO 9001
and ISO 14001.
■
These operating instructions contain important information on
handling the instrument. Working safely requires that all safety
instructions and work instructions are observed.
■
Observe the relevant local accident prevention regulations and
general safety regulations for the instrument's range of use.
■
The operating instructions are part of the product and must be kept
in the immediate vicinity of the instrument and readily accessible to
skilled personnel at any time.
■
Skilled personnel must have carefully read and understood the
operating instructions, prior to beginning any work.
■
The manufacturer's liability is void in the case of any damage
caused by using the product contrary to its intended use,
non-compliance with these operating instructions, assignment
of insuciently qualied skilled personnel or unauthorised
modications to the instrument.
■
The general terms and conditions contained in the sales
documentation shall apply.
■
Subject to technical modications.
■
Further information:
- Internet address:
www.wika.de / www.wika.com
- Relevant data sheet: TV 17.10
1. General information
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WIKA operating instructions model TGT73 5
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 the equipment or the
environment if not avoided.
Information
… points out useful tips, recommendations and
information for ecient and trouble-free operation.
WARNING!
... indicates a potentially dangerous situation that can
result in burns, caused by hot surfaces or liquids, if not
avoided.
1. General information
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6 WIKA operating instructions model TGT73
2. Safety
WARNING!
Before installation, commissioning and operation, ensure
that the appropriate gas-actuated thermometer has been
selected in terms of measuring range, design and specic
measuring conditions. The compatibility of the wetted
parts of the process connection (thermowell, stem etc.)
with the medium must be tested.
Non-observance can result in serious injury and/or
damage to the equipment.
WARNING!
This is protection class 3 equipment for connection at low
voltages, which are separated from the power supply or
voltage by greater than AC 50 V or DC 120 V. Preferably,
a connection to an SELV or PELV circuit is recommended;
alternatively protective measures from HD 60346-4-41
(DIN VDE 0100-410).
Alternatively for North America:
The connection can be made in line with "Class 2
Circuits" or "Class 2 Power Units" in accordance with CEC
(Canadian Electrical Code) or NEC (National Electrical
Code).
Further important safety instructions can be found in the
individual chapters of these operating instructions.
2.1 Intended use
The gas-actuated thermometer is mainly used in the process industry
to monitor and control process temperatures.
The instrument has been designed and built solely for the intended
use described here, and may only be used accordingly.
2. Safety
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WIKA operating instructions model TGT73 7
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
taken out of service immediately and inspected by an authorised
WIKA service engineer.
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 if qualication is insucient!
Improper handling can result in considerable injury and
damage to equipment.
■
The activities described in these operating instructions
may only be carried out by skilled personnel who have
the qualications described below.
■
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.
2.3 Special hazards
WARNING!
Residual media in the dismounted gas-actuated
thermometer can result in a risk to personnel, the
environment and equipment. Take sucient precautionary
measures.
2. Safety
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8 WIKA operating instructions model TGT73
2. Safety / 3. Specications
Before mounting and commissioning the instrument,
ensure you read the operating instructions!
CE, Communauté Européenne
Instruments bearing this mark comply with the relevant
European directives.
3. Specications
Gas-actuated thermometer model TGT73
Measuring element Inert gas expansion system
Nominal size 100, 160
Instrument version Back mount (axial)
Lower mount (radial)
Back mount, adjustable stem and dial
Instruments with capillaries
Permissible ambient temperature 0 ... 40 °C
Working range
■
Continuous load (1 year)
■
short term (max. 24 h)
Measuring range (EN 13190)
Scale range (EN 13190)
Case, ring
Stainless steel
Stem, process connection
Stainless steel 1.4571
Ingress protection
IP 65 per IEC 60529
2.4 Product label
Date of manufacture
Model
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WIKA operating instructions model TGT73 9
Electrical data
Power supply U
B
DC 12 ≤ U
B
≤ 30 V
Inuence of power supply ≤ 0.1 % of full scale value/10 V
Permissible residual ripple ≤ 10 % ss
Output signal, variant I
4 … 20 mA, 2-wire, passive, per NAMUR NE43
Permissible max. load R
A
R
A
≤ (U
B
- 12 V)/0.02 A with R
A
in Ω and U
B
in V, however max. 600 Ω
Eect of load ≤ 0.1 % of FS
Output signal, variant II 0 ... 10 V
Impedance at voltage output 0.5 Ω
Load capacity at voltage output 2 … 100 kΩ
Sensor sampling rate 600 ms
Linearity ≤ 1.0 % of span (limit point setting)
Output signal accuracy 0.2 % of FS (electronics only)
Resolution 0.15 % of FS (10 bit resolution at 360°)
Refresh rate (measuring rate) > 1/s
Input signal, angle of rotation 0 … 270 ∢ °
Long-term stability of electronics < 0.3 % of FS/a
Temperature error, electronics < 0.3 % of FS/10 K (in overall temperature
range)
Warm-up time ≤ 5 min
Permissible ambient temperature
0 ... 40 °C
Permissible storage temperature
-40 … +70 °C without liquid damping
-20 … +70 °C with liquid damping
Electromagnetic compatibility
(EMC)
EMC directive 2004/108/EC, EN 61326
emission (group 1, class B) and interference
immunity (industrial application)
Electrical connection via angular connector, 180°
rotatable, max. 1,5 mm², cable
protection, M20 x 1.5 cable gland,
cable outer diameter 7 ... 13 mm,
incl. strain relief
Ingress protection IP 65 to IEC 60529
Protection against reverse polarity and
overvoltage
3. Specications
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10 WIKA operating instructions model TGT73
Designation of terminal
connectors dependent on the
output signal variant
Terminal
Type
1
2
3
4
5
6
Variant I
4 ... 20 mA
GND
I+
reserved
reserved
reserved
reserved
Variant II
0 ... 10 V
GND
UB+
U
out
reserved
reserved
reserved
For further specications see WIKA data sheet TV 17.10 and the
order documentation.
4. Design and function
4.1 Description
The gas-actuated thermometer consists of a stem, capillary, Bourdon
tube and transmitter in the casing. These parts are combined to form
a single unit. The entire measuring system is lled with an inert gas
under pressure.
Any change in temperature causes a change in internal pressure in
the stem, and thus a change in the shape of the pressure element.
This motion is converted, via a mechanical movement, into a
rotational motion. A magnet on the pointer shaft rotates proportionally
to the instrument pointer as a direct linear function of the process
temperature. The downstream electronics detect the rotational motion
of the magnet in the display range.
A magnetic-eld dependent rotational sensor picks up this change on
the electronics side, contact-free, wear-free and without reaction on
the pressure element.
3. Specications / 4. Design and function
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WIKA operating instructions model TGT73 11
The rotational motion is converted into an electrical signal. The
electronics are factory set to the standard 4 ... 20 mA passive or
0 ... 10 V output signal. The span of the electrical output signal
corresponds to the measuring span on the dial.
Through these two standard electrical output signals, this instrument
can be set to almost any range in the industry.
Thermometers from the intelliTHERM range with transmitters
combine all the advantages of a local mechanical display with the
industry‘s requirements for electrical signal transmission and a
modern measured value registration.
Variations in the ambient temperature acting on the case are
compensated for by a bimetal element mounted between the
movement and the Bourdon tube.
Scale ranges with accuracy class 1 per EN 13190
between -200 ... +700 °C
4.2 Scope of delivery
Cross-check the scope of delivery with the delivery note.
5. Transport, packaging and storage
5.1 Transport
Check the gas-actuated thermometer 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).
4. Design and function / 5. Transport ...
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12 WIKA operating instructions model TGT73
5.3 Storage
Permissible conditions at the place of storage:
Storage temperature: -40 … +70 °C (EN 13190) without liquid damping
-20 … +70 °C (EN 13190) with liquid damping
Avoid exposure to the following factors:
■
Direct sunlight or proximity to hot objects
■
Mechanical vibration, mechanical shock (putting it down hard)
■
Soot, vapour, dust and corrosive gases
■
Potentially explosive environments, ammable atmospheres
Store the gas-actuated thermometer in its original packaging in
a location that fulls the conditions listed above. If the original
packaging is not available, pack and store the thermometer 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..
The use of liquid damping is always recommended for
temperatures near the dew point (±1 °C around 0 °C).
5. Transport, packaging and storage
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WIKA operating instructions model TGT73 13
6. Commissioning, operation
When screwing the instruments in, the force required to do this must
not be applied through the casing, but only through the spanner ats
provided for this purpose, and using a suitable tool.
Installation with
open-ended spanner
■
If possible, the entire length of the stem should be exposed to the
temperature being measured. However, at least the length of the
active part that corresponds to the length of the gas expansion
vessel (active length).
■
In pipelines or other measuring points, the temperature probe must
be angled as far towards the ow as possible.
■
Errors in thermal conduction occur if the area where the
temperature is to be measured is so small, that the mass of the
temperature probe acts as thermal capacity. Errors in thermal
conduction may also occur if the immersion depth is insucient, if
the mounting ttings are connected to a good thermal conductor
(metal plate or similar) and there is a considerable dierence
in temperature between the measuring and mounting element
temperatures.
■
The dial casing must be mounted free from vibration. If necessary,
it is possible to isolate the instrument from the mounting point by
installing a exible connection line between the measuring point
and the thermometer and mounting the instrument on a suitable
bracket.
6. Commissioning, operation
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14 WIKA operating instructions model TGT73
6. Commissioning, operation
If this is not possible, the following limit values must not be exceeded:
Dry gauges: Frequency range < 150 Hz
Acceleration < 0.7 g (7 m/s
2
)
Liquid-lled gauges: Frequency range < 150 Hz
Acceleration < 2 g (20 m/s
2
)
The liquid lling must be checked on a regular basis.
The liquid level must not drop below 75 % of the gauge diameter.
Heavy shocks, oscillations and vibrations lead to imprecise values,
increased wear in the movement, and fractures on welded or soldered
joints.
When mounting a gas-actuated thermometer that can be rotated
and swivelled, the specic instructions must be followed. In order to
set the indicator to the desired position, the following steps must be
taken:
1. The lock nut or union nut must be loosened at the process
connection.
2. The hexagon bolts and slotted screws at the swivel joint must be
loosened.
After mounting, set the compensating valve (if
available) from CLOSE to OPEN.
loosening
Make sure the screws on the
opposite side are loosened
as well!
GB
Thermowell
Stem
Required safety
clearance
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WIKA operating instructions model TGT73 15
3. Position the indicator as required, tighten the hexagon bolts and
slotted screws, and nally tighten the lock nut or union nut rmly.
When using thermowells, they must be lled with a thermal contact
medium in order to reduce the heat transfer resistance between the
outer wall of the sensor and the inner wall of the thermowell. The
working temperature of the thermal compound is -40 ... +200 °C.
WARNING!
Do not ll hot thermowells. There is a risk of the oil
spraying out!
6. Commissioning, operation
CAUTION!
When using thermowells, please
note that the stem must not touch
the bottom of the thermowell.
Due to the dierent coecients
of expansion of the materials, the
stem can bend at the bottom of the
thermowell.
(For the formula for the calculation
of the insertion length, l
1
, see the
respective thermowell data sheet)
GB
Capillary
Bend protector
3107922.01
Tube clip mounting
Lagging
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16 WIKA operating instructions model TGT73
7. Mounting instructions for contact bulb
The contact bulb has been designed for mounting on pipes or tanks.
When mounting this thermometer version, it must be ensured that the
contact bulb is in contact with the measuring point over its complete
length. The basic requirements to ensure a perfect measurement
result is to retain good thermal contact between the skin mounted
contact bulb and the outside wall of the pipe or tank with minimal heat
loss to ambient from the skin mounted contact bulb and measuring
point.
3107876.01
7.1 Mounting to pipes
The geometry of the contact
bulb has been designed for
pipes with external diameters
between 20 and 160 mm. The
skin mounted contact bulb should
have direct metallic contact with
the measuring point and have rm
contact with the surface of the
pipe. Where temperatures under
200 °C are to be expected, a heat conducting paste can be used to
optimise the heat transmission between skin mounted contact bulb
and pipe. Lagging must be applied where the skin mounted contact
bulb has been mounted, in order to avoid error due to heat loss.
This lagging must have sucient temperature resistance and is not
provided with the instrument.
7. Mounting instructions for contact bulb
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WIKA operating instructions model TGT73 17
7.2 Mounting to vessels
The geometry of the contact bulb
has been designed for vessels
with an external radius up to
80 mm. If the mounting point
of the skin mounting contact
bulb on the tank has an external
radius greater than 80 mm,
we recommend the use of an
intermediate piece designed for the respective vessel diameter, made
of a material with good thermal conductivity. The contact bulb should
be fastened to the vessel by means of an angle bracket with clamping
screws, or any similar method. The skin mounted contact bulb should
have direct metallic contact with the measuring point and have rm
contact with the surface of the vessel.
A heat conductive paste can be used to optimise the heat
transmission between skin mounted contact bulb and the vessel,
if temperatures under 200 °C are to be expected. Lagging must be
applied where the skin mounted contact bulb has been mounted, in
order to avoid error due to heat loss. This lagging must have sucient
temperature resistance and is not provided with the instrument.
7. Mounting instructions for contact bulb
3107930.01
Angle bracket mounting
Lagging
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18 WIKA operating instructions model TGT73
8. Electrical connection
The electrical connection of the transmitter is made through an
angular connector. The exact pin assignments can be found in the
following drawings. In addition, the pin assignment, output signal and
the required power supply are stated on the product label.
Explanation of the terminal assignments used:
U
B+
Positive terminal of the power supply
0 V Negative terminal of the power supply
Sig+ Positive terminal of the output signal
Sig- Negative terminal of the output signal
The instruments must be connected to the equipotential bonding of
the plant.
Designation of terminal connectors
Terminals 1 and 2 are the connection terminals for the signal
output and the power supply, respectively. The terminal labelled
PE (protective earth) is internally connected to the casing. The
connections 3 to 6 or 4 to 6 in the 3-wire variant, should be left free
and must not be used as points (see also chapter 3 "Specications").
WARNING!
The gas-actuated thermometer with integrated rotary
encoder must be grounded through the thermometer
housing and through the ground terminal in the angular
connector.
8. Electrical connection
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WIKA operating instructions model TGT73 19
8. Electrical connection / 9. Maintenance ...
2-wire system 3-wire system
e.g. 4 ... 20 mA e.g. 0 ... 10 V
Earth, connected
to case
Terminals 3, 4, 5 and 6:
only for internal use
U
B
+/Sig+
+0V/Sig-
Evaluation
(display)
Power supply
Terminal box
Earth, connected
to case
I
out
/U
out
Terminals 4, 5 and 6:
only for internal use
U
B
+/Sig+
+0V/Sig-
Evaluation
(display)
Power supply
As a power supply, an unstabilised DC power supply is sucient, with
a max. ripple of 10 % ss in the range of the specied power supply
limits. It is important to ensure that the applied power supply is at least
greater than the maximum required voltage drop from the external
display and evaluation units; i.e. the voltage at the transmitter must
not fall below 12 V.
9. Maintenance and cleaning
9.1 Maintenance
Gas-actuated thermometers with transmitters are maintenance-free!
The indicator should be checked once or twice every year. To do this
the instrument must be disconnected from the process and checked
using a temperature calibrator.
Repairs must only be carried out by the manufacturer.
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20 WIKA operating instructions model TGT73
9.2 Cleaning
CAUTION!
■
Clean the instrument with a moist cloth.
■
Wash or clean the dismounted instrument before
returning it in order to protect personnel and the
environment from exposure to residual media.
■
Residual media in the dismounted gas-actuated
thermometer can result in a risk to personnel,
the environment and equipment. Take sucient
precautionary measures.
For information on returning the instrument see chapter
11.2 "Return".
10. Faults
Faults Causes Measures
No output signal No power supply or
cable break
Check voltage supply
and cables. Replace any
defective components found
Transmitter incorrectly
connected
Check connections; correct
connections if necessary
Electronics failure due to
too high power supply or
through external voltage
Return the instrument to the
manufacturer for repair
Constant output
signal upon change in
temperature
Power supply connected
the wrong way
(I = approx. 4.5 mA)
Check connection, and if
necessary, swap terminals
1 and 2
Transmitter fault Return the instrument to the
manufacturer for repair
Too high, constant
output signal upon
change in temperature
Electronics failure due to
too high power supply or
through external voltage
Return the instrument to the
manufacturer for repair
Signal span too small Power supply too low Rectify the power supply
Load too high Stay within the max.
permissible load
9. Maintenance and cleaning / 10. Faults
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