Endress+Hauser S TC65 Specifications
Technical Information
71105561
Omnigrad S -TC65
Thermocouple thermometer EEx-d certified, no replaceable insert, no
thermowell, process connection threaded fixed or compression fitting
PCP (4...20 mA), HART® or PROFIBUS-PA® electronics
Range of uses
The Omnigrad S TC65 is an industrial thermometer (thermocouple TC: K or J), developed for use in the fine chemicals and
petrochemical industry but also suitable for generic industrial
applications.
In compliance to EN 50014/18/20 (ATEX certification) it is
therefore particularly suitable also for hazardous areas.
When required, it’s also available with a transmitter
(PCP, HART® or PROFIBUS-PA®) into the housing.
The TC65 is available in different configurations and characteristics depending on process requirements.
The installation on the plants normally needed a special process
connection as a spring compression fitting.
Application areas
• Fine chemicals industry
• Petrochemical industry
• Light energy industry
• General industrial services
• Environmental engineering
TI288T/02/en
Features and benefits
• Customized immersion length
• Aluminium housing, with protection grade from IP66 to IP68
• Thermocouple with hot junction grounded or ungrounded in
mineral oxide cable (MgO cable) diameter: 3 or 6 mm
• Process connection welded or sliding/spring compression
fitting or std compression fitting
• PCP, HART® and PROFIBUS-PA®,
(4...20 mA 2-wire transmitters)
• The accuracy of the thermocouple TC (K (NiCr-Ni) and
J (Fe-CuNi)) are: Cl. 1 - 2 (EN 60584) or Cl. Special - Standard
(ANSI MC96.1)
• The thermocouple TC (K or J) are available in single or double
element
• ATEX II 2 GD EEx-d IIC certification
• ATEX II 1/2 GD EEx d IIC certification
4 0
Omnigrad S -TC65
Function and system design
Measuring principle The thermocouple (TC) thermometer’s sensing element consists of two metal wires that are homogeneous but
different one from the other and insulated along their entire length. The two wires are welded together at one
end, known as the “measurement or hot junction”. The other end, where the wires are free, is known as the
“cold or reference junction” and is connected to a electromotive force measurement circuit where the force is
generated by the different thermoelectric power of each of the thermocouple’s wires if there is a temperature
difference between the hot joint (T1) and the cold joint (Seebeck effect). The cold junction has to be “compensated” with reference to the temperature of 0°C (T0). The function that links the electromotive force to the
temperatures T1 and T0 is a curve whose characteristics depend on the materials used in the construction of
the thermocouple. Some thermocouples curves, and particularly those most reliable for the purposes of industrial readings, are those compliant with standards EN 60584 and ANSI MC96.1.
Equipment architecture The construction of the TC65 temperature sensor is
housing
fixed process
connection
insert
Fig. 1: TC65 with the various types of process connections (fixed or fitting) and parts of the insert.
insert
housing
sliding process
connection
(compression fitting)
based on the following standards:
•EN 50014/18 (housing)
•Neck (Fixed or sliding process connection)
•EN 60584 (insert and sensing element).
The housing is in painted aluminium alloy; it is suitable to contain a transmitter and/or the ceramic
block of the insert; the “Ingress Protection” is from
IP66 to IP68.
The process connections of the TC65 are: compression fitting (sliding or spring loaded), fixed process
connection threaded (M, GAS or NPT, see the section "System components").
The hot junction of the thermocouple (type K or J)
are positioned close to the tip of the probe. The
thermocouple is available in two versions:
grounded or ungrounded hot junction. The electrical structure of the thermocouple always complies
with EN 60584/61515 or ANSI MC96.1/ASTM
E585 standard rules.
Material & Weight
Operating conditions
Housing Insert Process connection Weight
aluminium epoxy
coated
sheath in:
SS 316L/1.4404
Inconel® 600/2.4816
fixed or sliding or sping loaded in
SS 316/1.4401
from 0,5 to 1.0 kg for standard
options
Performance
Operating condition or test Product type or rules Value or data of test
Ambient temperature housing (without head-mounted transmitter -40÷130°C
housing (with head-mounted transmitter) -40÷85°C
Process temperature It is restricted by the material
sheath: insert or thermowell
Process pressure (Maximum) The pressure values can be subjected at the various temperatures.
Maximum flow velocity The highest flow velocity, (of the stream or of the fluid), tolerated, diminishes with
Shock and vibration resistance
test
Example: for 9 mm diameter pipes, with a limited flow velocity, the
maximum tolerated pressures are the following:
increasing lengths of the thermowell/probe exposed.
Insert in according to the rule
IEC 60751:
< 600°C SS 316L/1.4404
< 800°C SS 316Ti/1.4571
< 1100°C Hast.® C276/2.4819 -
Inc.600®/2.4816
50 bar to 20°C
33 bar to 250°C
24 bar to 400°C
Acceleration 3 g of peak
Frequency from 10Hz to 500Hz and back
Time of the
test
10 hours
2 Endress+ Hauser
Omnigrad S -TC65
Accuracy
Thermocouple
and range °C
J (Fe-CuNi)
-40° ... 750°C
K (NiCr-Ni)
-40 ... 1200°C
Thermocouple
and range °C
J (Fe-CuNi)
0 ...750°C
K (NiCr-Ni)
0...1250°C
Others errors
Transmitter maximum error See the corresponding documentation (codes at the end of the document)
Display maximum error 0.1% FSR + 1 digit (FSR = Full Scale Range)
Class Max deviation Class Max deviation Cable colours
2 +/-2.5°C (-40...333°C)
+/-0.0075 |t| (333...750°C)
2 +/-2.5°C (-40...333°C)
+/-0.0075 |t| (333...1200°C)
ItI = absolute temperature value in °C
Class Max deviation Class Max deviation Cable colours
Stand-
ard
Stand-
ard
+/-2.2°C (0...293°C)
+/-0.75%o(293...750°C)
+/-2.2°C (0...293°C)
+/-0.75%o(293...1250°C)
ItI = absolute temperature value in °C
EN 60584
1 +/-1.5°C (-40...375°C)
+/-0.004 |t| (375...750°C)
1 +/-1.5°C (-40...375°C)
+/-0.004 |t| (375...1000°C)
ANSI MC96.1
Special +/-1.1°C (0...275°C)
+/-0.4%o(275...750°C)
Special +/-1.1°C (0...275°C)
+/-0.4%o(275...1250°C)
Response time Tests, with the TC insert, in water at 0.4 m/s (according to IEC 60751) from 23 to 33°C:
Stem diameter of the insert Sensing element type Temperature of test Response time
Insulation
SS 316 - d. 6 mm K (NiCr-Ni) or J (Fe-CuNi) t
Measurement Insulation type Result
Insulation resistance between terminals and probe sheath
according to EN 60584, test voltage 500 V
50
t
90
> 1GΩ at 25°C
> 5 MΩ at 500°C
2,5 s
7,0 s
+ black
- white
+ green
- white
+ black
- red
+ yellow
- red
Self heating Negligible when the E+H iTEMP® transmitters are employed.
Installation
The Omnigrad S TC65 thermometer can be mounted on pipes, vessels or other plant parts that may be necessary, by means of compression junctions or thermowells.
The absence of the extension neck (situated between the process connection and the head) may expose the
housing to overheating. To ensure that, the head temperature has not to exceed the limit values defined in
paragraph "System components" (refer to fig. 3).
In the case of ATEX certified components (transmitter, insert), please refer to the relevant documentation (refer
to the code at the end of this document).
Immersion depth may have an effect on the accuracy of the measurement. If the immersion is too low, an error
may be generated in the temperature recorded due to the lower temperature of the process fluid near to the
walls and heat transfer, which takes place through the sensor stem.
The incidence of such an error can be not negligible if there is a big difference between the process temperature
and the ambient temperature. To avoid measurement errors of this kind, it is advisable to set an immersion
length (L) of at least 50÷70 mm (without thermowell).
In pipes of a small section the axis line of the duct must be reached and if possible slightly exceeded by the tip
of the probe (refer to fig. 2A-2B). Insulation of the outer part of the pipe reduces the effect produced by a low
immersion of the sensor. Another solution may be a tilted installation (see fig. 2C-2D). For a best installation,
in the industries, it's better to follow the rule: h ( d, L > D/2 + h.
Endress+Hauser 3
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