Thermocouple thermometer EEx-d certified, replaceable insert,
thermowell from pipe, process connection: threaded, flanged or sliding.
PCP (4...20 mA), HART® or PROFIBUS-PA® electronics
Range of uses
The Omnigrad S TC61 is an industrial thermometer (thermocouple TC: K or J) and thermowell from pipe, developed for the
use in the chemical, petrochemical and energy industries, but
suitable also for other generic 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 process connection of the thermowell can be threaded,
flanged or with a sliding compression fitting in compliance to
the standard rule DIN 43772 (form 2/3, 2G/3G and 2F/3F).
Application areas
• Chemicals industry
• Energy industry
• Gas Processing industry
• Petrochemical industry
• General industrial services
TI285T/02/en
Features and benefits
• Materials: SS 316L/1.4404, SS 316Ti/1.4571,
Hastelloy ®C276/2.4819 and Inconel® 600/2.4816
• The most common process connections: threaded, flanged
and sliding compression fitting are standard; others are on
request
• Customized immersion length
• Surface finishing down to Ra < 0.8 μm
• 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
• PCP, HART® and PROFIBUS-PA®,
(4...20 mA 2-wire transmitters)
• The accuracy of the TC (K (NiCr-Ni) and J (Fe-CuNi)) are:
Cl. 1 - 2 (EN 60584) or Cl. Special - Standard (ANSI MC96.1)
• The TC (K or J) are available in single or double element
• ATEX II 1/2 GD EEx-d IIC certification
• ATEX II 2 GD EEx-d IIC certification
4 0
Page 2
Omnigrad S -TC61
Function and system design
Measuring principleThe 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 DIN EN 60584 and ANSI MC96.1.
Equipment architecture The construction of the Omnigrad S TC61 temperature sensor is based on the following standards:
• EN 50014/18 (housing)
• EN 60584 (inset)
• DIN 43772 (thermowell)
The housing is in painted aluminium alloy; it is suitable to contain a transmitter and/or the ceramic block of
the inset; the “Ingress Protection” is from IP66 to IP68.
The replaceable insert is placed inside the thermowell; the
insert is spring loaded to its base in order to improve heat
transfer. 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 DIN EN 60584/61515 or ANSI MC96.1,
ASTM E585 standard rules.
The thermowell is made from tube with diameter 9, 11 or 12
mm. The final part of the thermowell can be straight, tapered
or reduced. The thermowell materials are: SS 316L/1.4404,
SS 316Ti/1.4571, Hastelloy
600/2.4816. The process connection of the thermowell can
be threaded (GAS or NPT), flanged (DIN or ANSI) or with a
compression fitting (see the section "System components").
Fig. 1:TC61 with the various types of process connections and end parts of the
probe
®C276/2.4819 and Inconel®
Material & Weight
Operating conditions
HousingInsertProcess connectionWeight
aluminium epoxy
coated
sheath in: SS 316L/1.4404,
Inconel® 600/2.4816
fixed or sliding: SS 316L/1.4404, SS
316Ti/1.4571, Hastelloy® C276/2.4819 and
Inconel® 600/2.4816
From 0.5 to 1.0 kg
for standard options
Performance
Operating condition or test Product type or rulesValue or data of test
Process temperature It is restricted by the thermowell
material:
Process pressure (Maximum) The pressure values to which the thermowell can be subjected at the
various temperatures are illustrated by the drawings in fig. 2 . For 9
mm diameter pipes, with a limited flow velocity, the maximum tolerated pressures are the following:
Maximum flow velocity The highest flow velocity, (of the stream or of the fluid), tolerated by the thermowell,
diminishes with increasing lengths, of the thermowell/probe exposed (fig. 2 ).
Acceleration3 g of peak
Frequencyfrom 10Hz to 500Hz and back
Time of the
10 hours
test
200
Bar
175
150
125
L =->mm; Vwater=3m/s250 400
100
75
50
L = 250 mm; Vair = 40 m/s
Maximum pressure allowed
25
L = 400 mm; Vair = 40 m/s
0
50
Fig. 2: Pressure/temperature drawing for thermowell with straight tube ø 11 mm in SS 316Ti/1.4571(left), with tapered tube ø 12 mm in
SS 316Ti/1.4571 (right)
Thermocouple
and range °C
J (Fe-CuNi)
-40° ... 750°C
K (NiCr-Ni)
-40 ... 1200°C
form 2
Steam pressure
L = 250 mm; Vsteam= 40 m/s
L = 400 mm; Vsteam= 40 m/s
100 150 200 250 300
Temperature
Maximum pressure allowed
350
400
450
°C
form 3
Steam pressure
L = 220 -> 280 mm; Vwater=3m/s
L = 220 mm; Vair = 40 m/s
L = 280 mm; Vair = 40 m/s
L = 280 mm; Vsteam = 40 m/s
L = 220 mm; Vsteam = 40 m/s
EN 60584
ClassMax deviationClassMax deviationCable 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)
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)
+ black
- white
+ green
- white
ItI = absolute temperature value in °C
Thermocouple
and range °C
J (Fe-CuNi)
0 ...750°C
K (NiCr-Ni)
0...1250°C
ClassMax deviationClassMax deviationCable 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)
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)
+ black
- red
+ yellow
- red
ItI = absolute temperature value in °C
Others errors
Transmitter maximum errorSee the corresponding documentation (codes at the end of the document)
Display maximum error0.1% FSR + 1 digit (FSR = Full Scale Range)
Response timeTests in water at 0.4 m/s (according to IEC 60751; from 23 to 33°C step changes):
TInsulation
Self heating Negligible when the E+H iTEMP® transmitters are employed.
Endress+Hauser3
Stem diameter of the insertSensing element typeTemperature of testResponse time
SS 316 - d. 6 mmK (NiCr-Ni) or J (Fe-CuNi) t
50
t
90
2,5 s
7,0 s
Measurement Insulation typeResult
Insulation resistance between terminals and probe sheath
according to EN 60584, test voltage 500 V
> 1GΩ at 25°C
> 5 MΩ at 500°C
Installation
The Omnigrad S TC61 thermometers can be installed on pipes or tanks by means of threaded or flanged connections. The immersion length must take into account all the parameters of the thermometer and the process
to measure. 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. In the case of ATEX certified components (transmitter, insert), please refer to the relevant documentation
Page 4
Omnigrad S -TC61
(refer to the code at the end of this document). 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 prevent measuring errors
of this kind, it is advisable to use thermometer with a small diameter on well and an immersion length (L) of
at least 80÷100 mm. In small section ducts the tubing’s axis must be reached and preferibly slightly exceeded
by the tip of the probe (see fig. 3A-3C). Insulation of the outer part of the sensor reduces the effect produced
by a low immersion. Alternatively, it is also possible to adopt a tilted installation (see fig. 3B-3D).
With regard to corrosion, the base material of the wetted parts can tolerate the common corrosive media right
up to even the highest temperatures. For a best installation, in the industries, it's better to follow the rule: h (
d, L > D/2 + h.
A
C
D
B
L
d
h
METALLIC SHEATH
L
h d/2
»
D
Fig. 3: Installation examples
THERMAL
INSULATING
L > D/2+h
For further information on specific applications, please contact the E+H Customer Service Department.
In the case that the sensor components are disassembled, in the following reassembly procedure the definite
torques must be employed. This will assure the housings with the IP grade defined.
System components
Housing The protection housing, our "TA21H", commonly referred to the “connection head”, is used to contain and
protect the terminal block or the transmitter and to join the electric connections to the mechanical component.
The TA21H used for the TC61 is compliant
with EN 50014/18 and EN 50281-1-1, EN
½ NPT, NPT
Ø90
64
Fig. 4: Housing TA21H
¾
G ½", M20x1.5
39
ø38
ø72
4Endress+ Hauser
50281-1-2 standards (EEx-d certification for
explosion proof type of protection).
The matching of the head with the extension
below the head and the cover (threaded)
ensures a degree of protection from IP66 to
115
~
IP68. The head also has a chain to connect
the body to the cover, which facilitates the
use of the instrument during the maintenance
on systems.
The single or double threaded electrical cable
entry can be: M20x1.5, 1/2” NPT or 3/4”
NPT, G1/2".
Page 5
Omnigrad S -TC61
Extension neck The extension neck is the part between the process connection and the housing.
It is normally made of a tube with dimensional and physical characteristics (diameter and material) which are
the same of the tube under the connection.
The standard lengths of the neck are 80 or
30
°C
25
20
15
10
Head heating
5
0
100 125 150 175 20075
Neck extension length
Process temperature
225 250
570°C
400°C
220°C
mm
145 mm, according to the selected option. In
accordance with the norm DIN 43772, in
the case of a thermowell with a diameter of
12 mm and a tapered tip (form 3G), the
extension neck will be respectively 82 or 147
mm. The connection situated in the upper
part of the neck allows for orientation of the
sensor head. As illustrated by the drawing in
figure 5, the length of the extension neck
may influence the temperature in the head. It
is necessary that this temperature is kept
within the limit values defined in the paragraph “Operating Conditions”.
Fig. 5:Heating of the head consequent to the process temperature
Electronic head transmitterThe required type of output signal can be obtained by choosing the correct head mounted transmitter.
Endress+Hauser supplies “state-of-the-art” transmitters (the iTEMP® series) built in 2-wire technology and
with 4…20 mA output signal, HART® or PROFIBUS-PA®. All of the transmitters can be easily programmed
using a PC:
Head transmitterCommunication software
PCP TMT181ReadWin® 2000
® TMT182ReadWin® 2000, FieldCare, Hand held module DXR275, DXR375
HART
PROFIBUS PA
® TMT184FieldCare
In the case of PROFIBUS-PA® transmitters, E+H recommends the use of PROFIBUS® dedicated connectors.
The Weidmüller type is provided as a standard option. For detailed information about transmitters, please refer
to the relevant documentation (refer to TI codes at the end of the document). If a head-mounted transmitter
is not employed, the sensor probe may be connected through the terminal block to a remote converter (i.e.
DIN rail transmitter). The customer may specify the configuration desired during the order phase. The headmounted transmitters available are:
DescriptionDwg
TMT181: PCP 4…20 mA.
The TMT181 is a PC programmable transmitters
TMT182: Smart HART®.
The TMT182 output consists of 4…20 mA and HART®
superimposed signals.
TMT184: PROFIBUS-PA®.
For the TMT184, with PROFIBUS-PA® output signal,
the communication address may be set via software or via
mechanical dip-switch.
Ø33
1
+
2
-
Ø 6.5
6
+
-
5
Ø33
1
+
1
Ø6.5
8
6
+
-
5
Ø 4.5
Ø44
3
4
2
-
Ø 4.5
3
4
22.5
Ø44
26.8
Ø44
Ø33
Ø44
Ø33
Endress+Hauser5
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Omnigrad S -TC61
Process connection Standard connections are available in the following types: Threaded or Flanged
Other versions may be supplied upon request, while other characteristic are available in the structure at the
and of this document. The table below illustrate the engaging lengths and typies of process connections.
Probe In the TC61 the measuring probe is made up of a mineral insulated insert (MgO) positioned inside the ther-
mowell. The employed MgO cable is compliant with the norm DIN EN 61515 (IEC 1515) or ASME E585
depending on the requested version.The insert length is available in the standard dimensions DIN 43772 and
in the most commonly used ones, or it can be personalized by the client within a range of values (refer to “Sales
Structure” at the end of the document).
For replacement, the length of the insert (IL) must be chosen in compliance with the immersion length (L) of
the thermowell (see fig. 6). If spare parts are required, refer to the following table.
With regards to the thermowell, the surface roughness (Ra) of the wetted parts is 0.8 mm, while the various
kinds of tips (reduced or tapered) are described in fig. 6;
Thermowell type Tip of the sensorInsert typeInsert (E) Neck Insert Length (mm)
TW 10
TW 13
TW 12
TW 11
(GAS)
TW 11
(NPT)
Straight
Reduced on Ø 9 and Ø
11
Tapered on Ø 9Ø = 3 mm
TPC100/TPC3
00
Tapered on Ø 12
Straight
Reduced on Ø 9 and Ø
11
Tapered on Ø 9Ø = 3 mm
TPC100/TPC3
00
Tapered on Ø 12
Straight
Reduced on Ø 9 and Ø
11
Tapered on Ø 9Ø = 3 mm
TPC100/TPC3
00
Tapered on Ø 12
Straight
Reduced on Ø 9 and Ø
11
Tapered on Ø 9Ø = 3 mm
TPC100/TPC3
00
Tapered on Ø 12
Ø = 6 mm
Ø = 6 mm
Ø = 6 mm
Ø = 6 mm
E = 80/82 mm
E =
IL = L + E + 33
145/147mm
E = 80/82 mm
E =
IL = L + 63
145/147mm
//IL = L + 70
//IL = L + 75
6Endress+ Hauser
Page 7
Omnigrad S -TC61
L
+
-
+
-
+
-
-
+
-
ELECTRICAL DIAGRAM ON TERMINAL BLOCK
TAPERED
2xTC
2 wires
TYPE of TIP
2°TC1°TC
STRAIGHT
1°TC
1xTC
2 wires
- FLANGE
- NPT
WITH TERMINAL
BLOCK
1°TC
Ø42
Ø33
41
E
-M
- GAS
- BSP
M4x1
IL
40
Ø8
... WITH TRANSMITTER
1
6
5
Ø44
Ø33
M4x1
Ø8
+
-
2
mA
3
4
Ø42
Ø33
75
40
Ø8
40
L
3
Ø 6.6
3
Ø 5.3
L
3
Ø
Ø 9, 11, 12, "X"
Ø3Ø6
Ø6
Fig. 6: Functional components, standard electrical diagrams (ceramic terminal block), Tip on the end of the probe
Certificates & approvals
Ex approval • ATEX Certificate CESI 05ATEX038 for explosion proof type of protection: ATEX II 2 GD EEx-d IIC T6..T5
T85°...T100°C. The TC61 is 4 marked.
With regards to the NAMUR NE 24 certificate and the Manufacturer’s Declaration according to the standard
EN 50018, EN 50020, EN 50281-1-1, EN 50281-1-2, E+H Customer Service will be able to provide further
detailed information.
PED approvalThe Pressure Equipment Directive (97/23/CE) is respected. As paragraph 2.1 of article 1 is not applicable to
these types of instruments. The 4 mark according to PED Directive is not requested.
Endress+Hauser7
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Omnigrad S -TC61
Material certificationThe material certificate EN 10204 3.1 can be directly selected from the sale structure of the product and refers
to the parts of the sensor in contact with the process fluid.
Other types of certificates related to materials can be requested separately.
The “short form” certificate includes a semplified declaration with no enclosures of documents related to the
materials used in the construction of the single sensor and guarantees the traceability of the materials through
the identification number of the thermometer.
The data related to the origin of the materials can subsequently be requested by the client if necessary.
Test on thermowell The pressure tests are carried out at ambient temperature in order to verify the resistance of the thermowell to
the specifications indicated by the norm DIN 43772.
With regards to the thermowells that do not comply with this norm (with a reduced tip, a tapered tip on a 9
mm tube, special dimensions, ...), the pressure of the corresponding straight tube with similar dimensions is
verified. The sensors certified for use in Ex Zones, are always tested to pressure according to the same criterions.
Further details
Maintenance The Omnigrad S TC61 thermometers do not require any specific maintenance.
In the case of ATEX certified components (transmitter, insert or thermowell) please refer to the corresponding
specific relevant documentation (at the end of the document).
Sales structure
Ordering information
TC61-
Omnigrad S TC61. Thermocouple thermometer
Thermometer complete of DIN style pipe thermowell.
Replaceable mineral insulated inset, spring loaded in terminal head, IP66 - IP68 connection with epoxy coating.
Two operating and measurement ranges: from -40 to 750°C (with TC J); -40 to 1100°C (with TC K)
Brochure Field of activities - Temperature measurementFA006T/09/en
Temperature head transmitter iTEMP® PCP TMT181 TI070R/09/en
Temperature head transmitter iTEMP® HART® TMT182 TI078R/09/en
Temperature head transmitter iTEMP® PA TMT184 TI079R/09/en
TC insert for temperature sensors - Omniset TPC100TI278T/02/en
TC insert for temperature sensors - Omniset TPC300 (to be released)TI291T/02/en
Safety instructions for use in hazardous areas (TPC300 to be released) XA017T/02/en
TA fittings & sockets Omnigrad TA50, TA55, TA60, TA70, TA75TI091T/02/en
TC thermometers Omnigrad TSC - General informationTI090T/02/en
Thermowell for temperature sensor - Omnigrad M TW10 TI261T/02/en
Thermowell for temperature sensor - Omnigrad M TW11 TI262T/02/en
Thermowell for temperature sensor - Omnigrad M TW12 TI263T/02/en
Thermowell for temperature sensor - Omnigrad M TW13 TI264T/02/en
Endress+Hauser11
Page 12
International Head Quarter
71105554
Endress+Hauser
GmbH+Co. KG
Instruments International
Colmarer Str. 6
79576 Weil am Rhein