Endress+Hauser M TC15 Specifications

TI01100T/09/EN/02.13
71226928

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Technical Information

Omnigrad M TR15, TC15

Modular thermometer with extension neck,
barstock thermowell, available with a flange or as
a weld-in unit

TR15 Resistance thermometer (RTD)
TC15 Thermometer with thermocouple (TC)

Application

• Universal range of application

• Particularly suitable for steam and gas applications with high process pressures
and temperatures

• Measuring range:
– Resistance insert (RTD): –200 to 600 °C (–328 to 1 112 °F)
– Thermocouple (TC): –40 to 1 100 °C (–40 to 2 012 °F)

• Static pressure range up to 400 bar (5 800 psi)

• Degree of protection up to IP68

Head transmitter

All Endress+Hauser transmitters are available with enhanced accuracy and reliability
compared to directly wired sensors. Easy customizing by choosing one of the
following outputs and communication protocols:

• Analog output 4 to 20 mA

• HART

• PROFIBUS® PA

• FOUNDATION Fieldbus™

Your benefits

• High degree of flexibility thanks to modular design with standard terminal heads

• High compatibility with a design according to DIN 43772

• Extension neck to protect the head transmitter from overheating

• Fast response time with reduced/tapered tip form

• Types of protection for use in hazardous locations:

®

as per DIN EN 50446 and customer-specific immersion lengths

– Intrinsic Safety (Ex ia)
– Non-sparking (Ex nA)

Function and system design

Measuring principle Resistance thermometer (RTD)

These resistance thermometers use a Pt100 temperature sensor according to IEC 60751. The
temperature sensor is a temperature-sensitive platinum resistor with a resistance of 100 Ω at
0 °C (32 °F) and a temperature coefficient α = 0.003851 °C-1.

There are generally two different kinds of platinum resistance thermometers:

• Wire wound (WW): Here, a double coil of fine, high-purity platinum wire is located in a ceramic
support. This is then sealed top and bottom with a ceramic protective layer. Such resistance
thermometers not only facilitate very reproducible measurements but also offer good long-term
stability of the resistance/temperature characteristic within temperature ranges up to
600 °C (1 112 °F). This type of sensor is relatively large in size and it is comparatively sensitive to
vibrations.

• Thin film platinum resistance thermometers (TF): A very thin, ultrapure platinum layer,
approx. 1 μm thick, is vaporized in a vacuum on a ceramic substrate and then structured
photolithographically. The platinum conductor paths formed in this way create the measuring
resistance. Additional covering and passivation layers are applied and reliably protect the thin
platinum layer from contamination and oxidation, even at high temperatures.

The primary advantages of thin film temperature sensors over wire wound versions are their smaller
sizes and better vibration resistance. A relatively low principle-based deviation of the resistance/
temperature characteristic from the standard characteristic of IEC 60751 can frequently be observed
among TF sensors at high temperatures. As a result, the tight limit values of tolerance category A as
per IEC 60751 can only be observed with TF sensors at temperatures up to approx. 300 °C (572 °F).
For this reason, thin-film sensors are generally only used for temperature measurements in ranges
below 400 °C (932 °F).

Omnigrad M TR15, TC15

Thermocouples (TC)

Thermocouples are comparatively simple, robust temperature sensors which use the Seebeck effect
for temperature measurement: if two electrical conductors made of different materials are connected
at a point, a weak electrical voltage can be measured between the two open conductor ends if the
conductors are subjected to a thermal gradient. This voltage is called thermoelectric voltage or
electromotive force (emf.). Its magnitude depends on the type of conducting materials and the
temperature difference between the "measuring point" (the junction of the two conductors) and the
"cold junction" (the open conductor ends). Accordingly, thermocouples primarily only measure
differences in temperature. The absolute temperature at the measuring point can be determined
from these if the associated temperature at the cold junction is known or is measured separately and
compensated for. The material combinations and associated thermoelectric voltage/temperature
characteristics of the most common types of thermocouple are standardized in the IEC 60584 and
ASTM E230/ANSI MC96.1 standards.

2

Omnigrad M TR15, TC15

A

= 20-250V DC/AC

» 50/60Hz

4...20 mA

24V DC / 30 mA

B

C

°C

Measuring system

A0010494

 1 Application example

A Mounted thermometer with head transmitter installed.
B RIA16 field display unit - The display unit records the analog measuring signal from the head transmitter and

shows this on the display. The LC display shows the current measured value in digital form and as a bar graph
indicating a limit value violation. The display unit is looped into the 4 to 20 mA circuit and gets the required
energy from there. More information on this can be found in the Technical Information (see "Documentation").

C Active barrier RN221N - The RN221N (24 V DC, 30 mA) active barrier has a galvanically isolated output for

supplying voltage to loop-powered transmitters. The universal power supply works with an input supply
voltage of 20 to 250 V DC/AC, 50/60 Hz, which means that it can be used in all international power grids.
More information on this can be found in the Technical Information (see "Documentation").

3

Equipment architecture

E

1 2

3

5

6

ILIL

L

10 mm
(0.4 in)

U

U1

5

4

6

Omnigrad M TR15, TC15

A0011012

 2 Thermometer design

1 Insert with head transmitter mounted (example with 3 mm (0.12 in))
2 Insert with terminal block mounted (example with 6 mm (0.24 in))
3 Terminal head
4 Version without thermowell
5 Thermowell from barstock material
6 Process connection: with or without a flange
E Extension neck length
L Total thermowell length
IL Insertion length
U Length of conical tip
U1 Immersion length; length of the part of the thermowell in contact with the process from the tip to the sealing

surface of the flange

Thermometers from the Omnigrad M TR15 and TC15 series have a modular design. The terminal
head is used as a connection module for the mechanical and electrical connection of the insert. The
position of the actual thermometer sensor in the insert ensures that it is mechanically protected. The
insert can be exchanged and calibrated without interrupting the process. Either ceramic terminal
blocks or transmitters can be fitted to the internal base washer. The thermowell is made from
barstock and is available with diameters measuring 18, 24 or 26 mm (0.71, 0.94 or 1.02 in). The tip
of the thermowell is tapered. The thermometer is installed in the system (pipe or tank) using a
flange connection or by welding the thermometer in place (→  20).

Measurement range

• RTD: –200 to 600 °C (–328 to 1 112 °F)

• TC: –40 to 1 100 °C (–40 to 2 012 °F)

Performance characteristics

Operating conditions Ambient temperature

Terminal head Temperature in °C (°F)

Without mounted head transmitter Depends on the terminal head used and the cable gland or fieldbus

With mounted head transmitter –40 to 85 °C (–40 to 185 °F)

With mounted head transmitter and
display

connector, see 'Terminal heads' section

–20 to 70 °C (–4 to 158 °F)

4

Omnigrad M TR15, TC15

0

5

10

15

20

25

30

35

40

45

100 200 300 400

v (m/s)

A

B

0

4 8 12 16

0

15

30

50

65

80

100

115

130

145

v (ft/s)

U1 (mm)

U1 (in)

50

165
160

0

5

10

15

20

25

30

35

40

45

100 200 300 400

v (m/s)

0

4 8 12 16

0

15

30

50

65

80

100

115

130

145

v (ft/s)

U1 (mm)

U1 (in)

Process pressure (static)

Process connection Standard Max. process pressure

Weld-in version - ≤400 bar (5 800 psi)

Flange

EN1092-1 or ISO
7005-1

ANSI B16.5 150 or 300 psi depending on the flange pressure rating

JIS B 2220 20K, 25K or 40K depending on the flange pressure rating

20, 40, 50 or 100 bar depending on the flange pressure rating
PNxx

Permitted flow velocity depending on the immersion length

The highest flow velocity tolerated by the thermometer diminishes with increasing immersion length
exposed to the stream of the fluid. In addition it is dependent on the diameter of the thermometer
tip, on the kind of measuring medium, on the process temperature and on the process pressure. The
following figures exemplify the maximum permitted flow velocities in water and superheated steam
at a process pressure of 5 MPa (50 bar).

 3 Permitted flow velocity depending on the immersion length

A Medium water at T = 50 °C (122 °F)
B Medium superheated steam at T = 400 °C (752 °F)
U1 Immersion length thermowell, material 1.4571 (316Ti)
v Flow velocity

----- Thermowell diameter 18 mm (0.71 in), U = 65 mm (2.56 in)

- - - Thermowell diameter 24 mm (0.94 in), U = 125 mm (4.9 in)

Shock and vibration resistance

• RTD: 3G / 10 to 500 Hz according to IEC 60751

• TC: 4G / 2 to 150 Hz according to IEC 60068-2-6

A0011123

5

Omnigrad M TR15, TC15

A

AA

-200 -100 0 100 200 300 400 500 600°C

0.5

1.0

1.5

2.0

B

2.5

3.0

- 0.5

- 1.0

- 1.5

- 2.0

- 2.5

- 3.0

B

A

AA

Max. deviation (°C)

Max. deviation (°C)

Accuracy

RTD resistance thermometer as per IEC 60751

Class Max. tolerances (°C) Characteristics

Cl. AA, former 1/3

± (0.1 + 0.0017 · |t|

1)

)

Cl. B

Cl. A ± (0.15 + 0.002 · |t|

Cl. B ± (0.3 + 0.005 · |t|

1)

)

1)

)

Temperature ranges for compliance with the
tolerance classes

Wire wound
sensor (WW):

Cl. A Cl. AA

–100 to

–50 to +250 °C

+450 °C

Thin-film version

Cl. A Cl. AA

(TF):

• Standard

• iTHERM
StrongSens

®

–30 to +300 °C

–30 to +300 °C

0 to +150 °C

0 to +200 °C

1) |t| = absolute value °C

In order to obtain the maximum tolerances in °F, the results in °C must be multiplied by a factor
of 1.8.

Permissible deviation limits of thermoelectric voltages from the standard characteristic for
thermocouples as per IEC 60584 or ASTM E230/ANSI MC96.1:

Standard Type Standard tolerance Special tolerance

IEC 60584 Class Deviation Class Deviation

1) |t| = absolute value °C

Standard Type Standard tolerance Special tolerance

ASTM E230/ANSI
MC96.1

1) |t| = absolute value °C

J (Fe-CuNi) 2 ±2.5 °C (–40 to 333 °C)

±0.0075 |t|

K (NiCr-NiAl) 2 ±2.5 °C (–40 to 333 °C)

±0.0075 |t|

Deviation, the larger respective value applies

J (Fe-CuNi) ±2.2 K or ±0.0075 |t|

K (NiCr-NiAl) ±2.2 K or ±0.02 |t|

±2.2 K or ±0.0075 |t|
(0 to 1 260 °C)

1)

(333 to 750 °C)

1)

(333 to 1 200 °C)

1)

(–200 to 0 °C)

1 ±1.5 °C (–40 to 375 °C)

±0.004 |t|

1 ±1.5 °C (–40 to 375 °C)

±0.004 |t|

1)

(0 to 760 °C) ±1.1 K or ±0.004 |t|

1)

(375 to 750 °C)

1)

(375 to 1 000 °C)

(0 to 760 °C)

1)

±1.1 K or ±0.004 |t|
(0 to 1 260 °C)

A0008588-EN

1)

1)

6

Omnigrad M TR15, TC15

Response time

Calculated at an ambient temperature of approx. 23 °C by immersing in running water (0.4 m/s flow
rate, 10 K excess temperature):

Thermowell, U = length of tapered tip

Thermometer type Outer diameter t

Resistance
thermometer

18 mm (0.71 in)

(measuring probe
Pt100, TF/WW)

24 mm (0.94 in)

Thermowell, U = length of tapered tip

Thermometer
type

Thermocouple

Outer
diameter

18 mm
(0.71 in)

24 mm
(0.94 in)

t

(x)

t

50

t

90

t

50

t

90

(x)

U =
⁶⁵⁄₇₃ mm (².⁵⁶⁄₂.₈₇ in)

U =
¹²⁵⁄₁₃₃ mm

U =
275 mm (10.83 in)

Outer diameter
(tapered tip)

(⁴.⁹²⁄₅.₂₄ in)

t

50

t

90

t

50

t

90

22 s 22 s -

9 mm (0.35 in)

60 s 60 s -

31 s 31 s 31 s

12.5 mm (0.5 in)

96 s 96 s 96 s

Grounded Ungrounded

U =
⁶⁵⁄₇₃ mm
(².⁵⁶⁄₂.₈₇ in)

U =
¹²⁵⁄₁₃₃ mm
(⁴.⁹²⁄₅.₂₄ in)

U =
275 mm
(10.83 in)

U =
⁶⁵⁄₇₃ mm
(².⁵⁶⁄₂.₈₇ in)

U =
¹²⁵⁄₁₃₃ mm
(⁴.⁹²⁄₅.₂₄ in)

U =
275 mm
(10.83 in)

7 s 7 s - 7.5 s 7.5 s -

18 s 18 s - 19 s 19 s -

17 s 15 s 15 s 18 s 16 s 16 s

47 s 43 s 43 s 50 s 46 s 46 s

Insert: Tested in accordance with IEC 60751 in flowing water (0.4 m/s at 30 °C):

Sensor type Diameter ID Response time Thin film (TF)

iTHERM® StrongSens 6 mm (0.24 in) t

3 mm (0.12 in) t

TF Sensor

6 mm (0.24 in) t

3 mm (0.12 in) t

WW Sensor

6 mm (0.24 in) t

3 mm (0.12 in) t

Thermocouple (TPC100)
grounded

6 mm (0.24 in) t

3 mm (0.12 in) t

Thermocouple (TPC100)
ungrounded

6 mm (0.24 in) t

50

t

90

50

t

90

50

t

90

50

t

90

50

t

90

50

t

90

50

t

90

50

t

90

50

t

90

<3.5 s

<10 s

2.5 s

5.5 s

5 s

13 s

2 s

6 s

4 s

12 s

0.8 s

2 s

2 s

5 s

1 s

2.5 s

2.5 s

7 s

Response time for the sensor assembly without transmitter.

7

Omnigrad M TR15, TC15

Insulation resistance

Dielectric strength

Self heating

Calibration

• RTD:
Insulation resistance according to IEC 60751 > 100 MΩ at 25 °C between terminals and sheath
material measured with a minimum test voltage of 100 V DC

• TC:
Insulation resistance according to IEC 1515 between terminals and sheath material with a test
voltage of 500 V DC:
– > 1 GΩ at 20 °C
– > 5 MΩ at 500 °C

Tested at a room temperature for 5 s:

• 6 mm (0.24 in): ≥1 000 V DC between terminals and insert sheath

• 3 mm (0.12 in): ≥250 V DC between terminals and insert sheath

RTD elements are passive resistances that are measured using an external current. This
measurement current causes a self-heating effect in the RTD element itself which in turn creates an
additional measurement error. In addition to the measurement current, the size of the measurement
error is also affected by the temperature conductivity and flow velocity of the process. This self­heating error is negligible when an Endress+Hauser iTEMP® temperature transmitter (very small
measurement current) is connected.

Endress+Hauser provides comparison temperature calibration from
–80 to +1 400 °C (–110 to +2 552 °F) based on the International Temperature Scale (ITS90).
Calibrations are traceable to national and international standards. The calibration certificate is
referenced to the serial number of the thermometer. Only the insert is calibrated.

Insert:
⌀6 mm (0.24 in) and 3 mm (0.12 in)

Temperature range without head transmitter with head transmitter

–80 to –40 °C (–110 to –40 °F) 200 (7.87)

–40 to 0 °C (–40 to 32 °F) 160 (6.3)

0 to 250 °C (32 to 480 °F) 120 (4.72) 150 (5.91)

250 to 550 °C (480 to 1 020 °F) 300 (11.81)

550 to 1 400 °C (1 020 to 2 552 °F) 450 (17.72)

Minimum insertion length of insert in mm (in)

8

Omnigrad M TR15, TC15

Material

Extension neck and thermowell.

The temperatures for continuous operation specified in the following table are only intended as
reference values for use of the various materials in air and without any significant compressive load.
The maximum operation temperatures are reduced considerably in some cases where abnormal
conditions such as high mechanical load occur or in aggressive media.

Material name Short form Recommended max.

temperature for
continuous use in
air

AISI 316L/

1.4404

1.4435

AISI 316Ti/

1.4571

AISI A105/

1.0460

Duplex
SAF2205/

1.4462

Inconel600/

2.4816

Hastelloy
C276/ 2.4819

X2CrNiMo17-12-2
X2CrNiMo18-14-3

X6CrNiMoTi17-12-2 700 °C (1 292 °F) • Properties comparable to AISI316L

C22.8 450 °C (842 °F) • Heat-resistant steel

X2CrNiMoN22-5-3 300 °C (572 °F) • Austenitic ferritic steel with good

NiCr15Fe 1 100 °C (2 012 °F) • A nickel/chromium alloy with very good

NiMo16Cr15W 1 100 °C (2 012 °F) • A nickel-based alloy with good resistance to

650 °C (1 202 °F)

Properties

1)

• Austenitic, stainless steel

• High corrosion resistance in general

• Particularly high corrosion resistance in
chlorine-based and acidic, non-oxidizing
atmospheres through the addition of
molybdenum (e.g. phosphoric and sulfuric
acids, acetic and tartaric acids with a low
concentration)

• Increased resistance to intergranular
corrosion and pitting

• Compared to 1.4404, 1.4435 has even
higher corrosion resistance and a lower
delta ferrite content

• Addition of titanium means increased
resistance to intergranular corrosion even
after welding

• Broad range of uses in the chemical,
petrochemical and oil industries as well as
in coal chemistry

• Can only be polished to a limited extent,
titanium streaks can form

• Resistant in nitrogen-containing
atmospheres and atmospheres that are low
in oxygen; not suitable for acids or other
aggressive media

• Often used in steam generators, water and
steam pipes, pressure vessels

mechanical properties

• High resistance to general corrosion, pitting,
chlorine-induced or transgranular stress
corrosion

• Comparatively good resistance to
hydrogeninduced stress corrosion

resistance to aggressive, oxidizing and
reducing atmospheres, even at high
temperatures

• Resistant to corrosion caused by chlorine
gas and chlorinated media as well as many
oxidizing mineral and organic acids, sea
water etc.

• Corrosion from ultrapure water

• Not to be used in a sulfur-containing
atmosphere

oxidizing and reducing atmospheres, even at
high temperatures

• Particularly resistant to chlorine gas and
chloride as well as to many oxidizing
mineral and organic acids

9