Endress+Hauser TH56 Specifications

TI00111R/09/EN/14.18
71404940
2018-05-31

Products

Solutions Services

Technical Information

TH51, TH52 and TH56

General purpose MgO insulated thermocouples
with connection head, extension lead wires or
connectors for process and laboratory applications

Application

Magnesium Oxide insulated thermocouples, commonly referred to as MgO
thermocouples, are used in many process and laboratory applications. They have
many desirable characteristics making thermocouples a good choice for general and
special purpose applications.

The sensors can be used on:

• Heat exchangers

• Power and recovery areas

• Furnaces, dryers, flue gas

• Compressor stations

• Process reactors

• Metallurgical and glass manufacturing

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™

Field transmitter

Temperature field transmitters with HART® or FOUNDATION Fieldbus™ protocol for
highest reliability in harsh industrial environments. Backlit display with large
measured value, bargraph and fault condition indication for ease of reading.

®

Your benefits

• One source shopping for temperature measurement solutions. World class
transmitter with integrated sensor offering.
Remove and install straight out of the box!

• Improved galvanic isolation on most devices (2 kV)

• Simplified model structure: Competitively priced, offers great value. Easy to order
and reorder. A single model number includes sensor and transmitter assembly for
a complete point solution.

• All iTEMP transmitters provide long-term stability ≤ 0.05% per year

Function and system design

Thermocouples with
head transmitter
(TMT181 TC/RTD PCP or
TMT182 TC/RTD HART)
mounted inside
connection head

T 51H

RIA15
process display

Power supply
RNS 221

4 to 20 mA

Channel 1

Channel 2

24V DC / 30 mA

Universal Data
Manager (RSG35)

Tank

ENDRESS+HAUSER
TMT 122

DIN Rail Temp.
Transmitter
TMT121 PCP
TMT122 HART

®

TH52

= 20-253V DC/AC

» 50/60Hz

Measuring principle 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.

Measuring system

TH51, TH52 and TH56

A0025862

 1 Application example

RIA15 process display

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 process display unit is integrated in the 4 to 20 mA or HART® loop and is powered directly from
the current loop. Optionally up to four of a sensor's HART® process variables can be displayed. More
information on this can be found in the Technical Information, see "Documentation".

RNS221

The RNS221 (24 V DC, 30 mA) power supply has two galvanically isolated outputs for supplying voltage to
loop-powered transmitters. The two-channel 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".
RNS221 is an UL recognized component according to UL-3111-1.

Ecograph T, RSG35

Universal graphic display recorder with up to 12 universal inputs, 5.7" TFT screen for displaying measured
values in a maximum of four groups, with digital, bar graph and curve display. More information on this can be
found in the Technical Information, see "Documentation".

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TH51, TH52 and TH56

Input

Measured variable

Measurement range

Temperature (temperature-linear transmission behavior)

Measuring range by type and size

Upper temperature limits for various sheath diameters °C (°F)

Nominal diameter Thermocouple type

Sheath
O.D.

⌀ ¹⁄₁₆ in 0.010 30 260 °C (500 °F) 440 °C (825 °F) 510 °C (950 °F) 920 °C (1 690 °F)

⌀ ¹⁄₈ in 0.020 24 315 °C (600 °F) 520 °C (970 °F) 650 °C (1 200 °F) 1 070 °C (1 960 °F)

⌀ ³⁄₁₆ in 0.029 21

⌀ ³⁄₈ in 0.060 15

Maximum element temperature

Element
wire ⌀
(in)

range limits

Element
wire
gauge

T J E K N

370 °C (700 °F)

–270 to +400 °C
(–454 to +752 °F)

620 °C (1 150 °F) 730 °C (1 350 °F)

–210 to +1 200 °C
(–346 to +2 192 °F)

–270 to +1 000 °C
(–454 to +1 832 °F)

1 150 °C (2 100 °F)⌀ ¹⁄₄ in 0.039 19 720 °C (1 330 °F) 820 °C (1 510 °F)

–270 to +1 372 °C
(–454 to +2 500 °F)

These values are valid for single and duplex thermocouples. The temperature limits given are
intended only as a guide to the user and should not be taken as absolute values or as
guarantees of satisfactory life or performance. These types and sizes are sometimes used at
temperatures above the given limits, but usually at the expense of stability or life or both. In
other instances, it may be necessary to reduce the above limits in order to achieve adequate
service.

Duplex versions (2 elements) of type N with ¹⁄₁₆ in, ³⁄₁₆ in and ³⁄₈ in sheath diameter are not
available. Thermocouples with 316 SS sheath are rated for a maximum temperature of
927 °C (1 700 °F).

–270 to +1 300 °C
(–454 to +2 372 °F)

Output signal

Family of temperature transmitters

Output

Generally, the measured value can be transmitted in one of two ways:

• Directly-wired sensors - sensor measured values forwarded without a transmitter.

• Via all common protocols by selecting an appropriate Endress+Hauser iTEMP temperature
transmitter. All the transmitters listed below are mounted directly in the terminal head or as field
transmitter and wired with the sensory mechanism.

Thermometers fitted with iTEMP transmitters are an installation-ready complete solution to
improve temperature measurement by significantly increasing accuracy and reliability, when
compared to direct wired sensors, as well as reducing both wiring and maintenance costs.

PC programmable head transmitters

They offer a high degree of flexibility, thereby supporting universal application with low inventory
storage. The iTEMP transmitters can be configured quickly and easily at a PC. Endress+Hauser offers
free configuration software which can be downloaded from the Endress+Hauser Website. More
information can be found in the Technical Information.

HART® programmable head transmitters

The transmitter is a 2-wire device with one or two measuring inputs and one analog output. The
device not only transfers converted signals from resistance thermometers and thermocouples, it also
transfers resistance and voltage signals using HART® communication. It can be installed as an
intrinsically safe apparatus in Zone 1 hazardous areas and is used for instrumentation in the
terminal head (flat face) as per DIN EN 50446. Swift and easy operation, visualization and

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TH51, TH52 and TH56

maintenance using universal device configuration tools like FieldCare, DeviceCare or
FieldCommunicator 375/475. For more information, see the Technical Information.

PROFIBUS® PA head transmitters

Universally programmable head transmitter with PROFIBUS® PA communication. Conversion of
various input signals into digital output signals. High accuracy over the complete ambient
temperature range. The configuration of PROFIBUS PA functions and of device-specific parameters is
performed via fieldbus communication. For more information, see the Technical Information.

FOUNDATION Fieldbus™ head transmitters

Universally programmable head transmitter with FOUNDATION Fieldbus™ communication.
Conversion of various input signals into digital output signals. High accuracy over the complete
ambient temperature range. All transmitters are released for use in all important process control
systems. The integration tests are performed in Endress+Hauser's "System World". For more
information, see the Technical Information.

Advantages of the iTEMP transmitters:

• Dual or single sensor input (optionally for certain transmitters)

• Pluggable display (optionally for certain transmitters)

• Unsurpassed reliability, accuracy and long-term stability in critical processes

• Mathematical functions

• Monitoring of the thermometer drift, sensor backup functionality, sensor diagnostic functions

• Sensor-transmitter matching for dual sensor input transmitters, based on Callendar/Van Dusen
coefficients

Field transmitter

Field transmitter with HART® or FOUNDATION Fieldbus™ communication and backlit display. Can
be read easily from a distance, in sunlight and at night. Large measurement value, bargraph and
fault indication displayed. Benefits are: dual sensor input, highest reliability in harsh industrial
environments, mathematic functions, thermometer drift monitoring and sensor back-up
functionality, corrosion detection.

Galvanic isolation

Galvanic isolation of Endress+Hauser iTEMP transmitters

Transmitter type Sensor

TMT181 PCP Û = 3.75 kV AC

TMT182 HART® U = 2 kV AC

TMT162 HART® Field transmitter U = 2 kV AC

TMT82 HART®

U = 2 kV ACTMT84 PA

TMT85 FF

In applications where fast response time is needed, grounded thermocouples are recommended.
This thermocouple design may cause a ground loop. This can be avoided by using iTEMP
transmitters with high galvanic isolation.

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TH51, TH52 and TH56

1

2

11.5...35 V

11.5...30 V Ex

4

6

TC

mA

4...20 mA

-

+

+

1

-

2

7

6

5

4

3

1

2

7

6

5

4

3

Sensor
input 2

Sensor
input 1

Bus connection

and supply voltage

Display connection

TC

TC

+

-

1

2

3

4

5

6

+

-

3

4

S1

3

S2

-

+

+

-

#

Sensor 1

Sensor 2 (not TMT142)

Power supply
field transmitter and
analog output 4 to 20 mA,
or bus connection

1

6

2

5

TC

TC

Sensor 1

Sensor 2 (not TMT142)

Power supply

Terminal assignment

Type of sensor connection TH51

Head transmitter mounted TMT18x (single input)

A0026046

Head mounted transmitter TMT8x (dual input)

Endress+Hauser 5

A0012699-EN

Field mounted transmitter

A0026944-EN

TH51, TH52 and TH56

1

2

-

-

+

+

Sensor 2

Sensor 1

4

+

-

1

2

3

5

6

+

-

3

4

S1

3

S2

-

+

+

-

!

+

Sensor 2

Sensor 1

-

Bus connection and
supply voltage

Terminal block mounted

A0026045-EN

DIN rail transmitters (TMT121 PCP/TMT122 HART®) can be purchased separately when using
a TH52.

The blocks and transmitters are shown as they sit inside the heads in reference to the conduit
opening.

Integrated overvoltage protection

The integrated overvoltage protection module can be ordered as an optional extra
protects the electronics from damage from overvoltage. Overvoltage occurring in signal cables (e.g.
4 to 20 mA, communication lines (fieldbus systems) and power supply is diverted to ground. The
functionality of the transmitter is not affected as no problematic voltage drop occurs.

1)

. The module

Connection data:

Maximum continuous voltage (rated voltage) UC = 42 V

Nominal current I = 0.5 A at T

Surge current resistance

• Lightning surge current D1 (10/350 µs)

• Nominal discharge current C1/C2 (8/20 µs)

• I

• In = 5 kA (per wire)

Temperature range –40 to +80 °C (–40 to +176 °F)

Series resistance per wire 1.8 Ω, tolerance ±5 %

 2 Electrical connection of the overvoltage protection

DC

= 80 °C (176 °F)

amb.

= 1 kA (per wire)

imp

In = 10 kA (total)

A0033027-EN

Grounding

The device must be connected to the potential equalization. The connection between the housing and the local
ground must have a minimum cross-section of 4 mm2 (13 AWG) . All ground connections must be secured
tightly.

1) Available for the field transmitter with HART® 7 specification

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TH51, TH52 and TH56

Wire specifications TH51

Thermocouple grade, TFE insulated 20 AWG, 7 strands with wire termination

TH52

All thermocouple extension wires are thermocouple grade.

Sheath OD Number of elements Extension wire (gauge)

⌀¹⁄₁₆"

⌀¹⁄₈"

⌀³⁄₁₆"

⌀¹⁄₄"

⌀³⁄₈"

1 24

2 24

1 20

2 24

1 20

2 24

1 20

2 20

1 20

2 20

Thermocouple wire types Construction and characteristics

Type Single conductor Duplex conductor Max. continuous temperature Notes

Insulation Impregnation Insulation Impregnation

Fiberglass Glass braid

0.006"

Teflon FEP extruded

0.008"

Silicone modified resin Glass braid

0.006"

/ Impregnation

0.010"

Impregnation 482 °C (900 °F) Impregnation retained to

204 °C (400 °F)

/ 204 °C (400 °F)

Flex armor is 0.272" nominal OD, 304SS 0.010" thick, square lock style.

TH52 is also available with connector, see section "Connector style",

Connector style

Type of connectors TH52 and TH56, standard and miniature plugs

A = STANDARD

max. 176.7 °C (350 °F)
TH52, all types J and K
TH56, types J and K
³⁄₁₆" and ¹⁄₄" only

A0026049

max. 176.7 °C (350 °F)
All Others!

A0026050

B = STANDARD W/FEMALE

C = MINI

max. 176.7 °C (350 °F)

A0026051

max. 176.7 °C (350 °F)

A0026052

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TH51, TH52 and TH56

Thermocouple color codes according to ASTM E-230

D = MINI W/FEMALE

E = STANDARD (high temp.)

G = STANDARD W/FEMALE (high temp.)

max. 176.7 °C (350 °F)

A0026053

max. 426.7 °C (800 °F)

A0026054

max. 426.7 °C (800 °F)

A0026055

Y = SPECIAL

T.C. Type POS

Material MAGNETIC Insulation Plug &

NEG

YES NO Single

conductor

Overall T.C.
wire

Jack

E EP (+) Nickel - 10% chromium X Purple Brown Purple

EN (-) Copper - 45% nickel

X Red

(constantan)

J JP (+) Iron X White Brown Black

JN (-) Copper - 45% nickel

X Red

(constantan)

K KP (+) Nickel - 10% chromium X Yellow Brown Yellow

KN (-) Nickel - 5% (aluminum,

silicon)

2)

X Red

T TP (+) Copper X Blue Brown Blue

TN (-) Copper - 45% nickel

X Red

(constantan)

N NP (+) Nickel - 14% chromium -

X Orange Brown Orange

1.5% silicon

NN (-) Nickel - 4.5% silicon - 0.1%

X Red

magnesium

1)

1) References for Plug & Jack Color Codes are based on ASTM E-1129/E 1129M-98, Standard Specification of

Thermocouple connectors and ASTM E-1684, Standard Specification for Miniature Thermocouple
Connectors.

2) Silicon, or aluminum and silicon may be present in combination with other elements.

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TH51, TH52 and TH56

Performance characteristics

Reference conditions

Response time

Maximum measured error

These data are relevant for determining the accuracy of the temperature transmitters used. More
information on this can be found in the Technical Information of the iTEMP temperature
transmitters.

63% response time per ASTM E839

Junction style ⌀¹⁄₁₆" ⌀¹⁄₈" ⌀³⁄₁₆" ⌀¹⁄₄" ⌀³⁄₈"

Grounded 0.3 s 0.6 s 0.9 s 1.3 s 3.5 s

Ungrounded 0.4 s 1.6 s 2.4 s 2.9 s 7.2 s

Response time for the sensor assembly without transmitter.

Thermocouples corresponding to ASTM E839

Type Temperature range Standard tolerance (IEC class 2) Special tolerance (IEC class 1)

[°C] whichever is greater [°C] whichever is greater

E 0 to 870 °C (32 to 1 600 °F)

J 0 to 760 °C (32 to 1 400 °F) ±2.2 or ±0.75% ±1.1 or ±0.4%

K 0 to 1 260 °C (32 to 2 300 °F) ±2.2 or ±0.75% ±1.1 or ±0.4%

T 0 to 370 °C (32 to 700 °F) ±1 or 0.75% ±0.5 or ±0.4%

N 0 to 1 260 °C (32 to 2 300 °F) ±2.2 or ±0.75% ±1.1 or ±0.4%

±1.7 or ±0.5% ±1 or ±0.4%

Transmitter long-term stability

Insulation resistance

For measurement errors in °F, calculate using equation above in °C, then mulitply the outcome
by 1.8.

≤ 0.1 °C (0.18 °F) / year or ≤ 0.05 % / year

Data under reference conditions; % relates to the set span. The larger value applies.

Insulation resistance for MgO insulated thermocouples with ungrounded hot junction between
terminals and probe sheath, test voltage 500 VDC.

1000 MΩ at 25 °C (77 °F)

These values for insulation resistance also apply between each thermocouple wire at single and
duplex constructions with ungrounded hot junction.

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