Endress+Hauser T55, T53 Specifications

TI00127R/09/EN/14.18 71404951 2018-05-31

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Solutions Services

Technical Information

T53, T54 and T55

Explosion proof thermocouple assemblies in thermowells with spring loaded insert and enclosure for process industry

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 sensor assemblies can be used in process industries such as:

• Chemicals

• Petrochemical

• Refineries

• Offshore Platforms

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

• FM/CSA XP Class I, Div. 1 approved temperature assemblies for maximum safety.

• One source shopping for temperature measurement solutions. World class

• Improved galvanic isolation on most devices (2 kV)

• Simplified model structure: Competitively priced, offers great value. Easy to order

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

transmitter with integrated sensor offering for heavy process industry applications. Remove and install straight out of the box!

and reorder. A single model number includes sensor, thermowell and transmitter assembly for a complete point solution.

Function and system design

= 20-250V DC/AC

» 50/60Hz

4...20 mA

24V DC / 30 mA

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

T53, T54 and T55

A0024883

 1 Application example

1 Mounted thermometer with head transmitter installed. 2 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".

3 Active barrier RN221N - The RN221N (24 VDC, 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".

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Input

Measured variable

Measurement range

Sheath O.D. Type T Type J Type E Type K Type N

⌀ ¹⁄₄ in 370 °C (700 °F) 370 °C (700 °F) 820 °C (1 510 °F) 1 150 °C (2 100 °F)

Maximum element temperature range limits

–270 to +400 °C

(–454 to +752 °F)

Temperature (temperature-linear transmission behavior)

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

–210 to +1 200 °C

(–346 to +2 192 °F)

–270 to +1 000 °C

(–454 to +1 832 °F)

–270 to +1 372 °C

(–454 to +2 500 °F)

–270 to +1 300 °C

(–454 to +2 372 °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.

Thermocouples with 316 SS sheath and assemblies with 316 SS thermowells are rated for a maximum temperature of 927 °C (1 700 °F).

Output

Output signal

Family of temperature transmitters

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 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

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T53, T54 and T55

11.5...35 V

11.5...30 V Ex

4...20 mA

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

Terminal assignments

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

Power supply

Type of sensor connection

Head transmitter mounted TMT18x (single input)

A0026046

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Sensor input 2

Sensor input 1

Bus connection

and supply voltage

Display connection

Sensor 1

Sensor 2 (not TMT142)

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

Sensor 1

Sensor 2 (not TMT142)

Sensor 2

Sensor 1

Head mounted transmitter TMT8x (dual input)

A0012699-EN

Field mounted transmitter

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

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A0026944-EN

Terminal block mounted

A0026045-EN

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

. The module

protects the electronics from damage from overvoltage. Overvoltage occurring in signal cables (e.g.

T53, T54 and T55

Sensor 2

Sensor 1

Bus connection and supply voltage

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.

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)

amb.

= 1 kA (per wire)

imp

= 80 °C (176 °F)

In = 10 kA (total)

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

A0033027-EN

Wire specifications

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.

Thermocouple grade, TFE insulated 20AWG, 7 strands with stripped ends

Electrical connection

Flying leads, standard 139.7 mm (5.5 in) for wiring in connection head, head mounted transmitter or terminal block mounted, and for wiring with TMT162 or TMT142 assemblies

Design of leads

Flying leads 139.7 mm (5.5 in) with stripped ends

A0027297

Connection with terminal block (4 pole) with stripped ends

A0027298

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Thermocouple color codes according to ASTM E-230

T.C. Type POS

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

J JP (+) Iron X White Brown

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

T TP (+) Copper X Blue Brown

N NP (+) Nickel - 14% chromium - 1.5% silicon X Orange Brown

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

Material MAGNETIC Insulation

NEG

EN (-) Copper - 45% nickel (constantan) X Red

JN (-) Copper - 45% nickel (constantan) X Red

KN (-) Nickel - 5% (aluminum, silicon)

TN (-) Copper - 45% nickel (constantan) X Red

NN (-) Nickel - 4.5% silicon - 0.1% magnesium X Red

YES NO Single conductor Overall T.C.

X Red

wire

Performance characteristics

Reference conditions

Response time

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

Thermocouple assembly T55 without thermowell

Junction style Thermocouple insert ⌀¹⁄₄"

Ungrounded 2.9 s

Response time for the sensor assembly without transmitter.

Response time examples for thermocouples assemblies with thermowell T53 and T54

Construction Stepped thermowell Tapered thermowell ³⁄₄" straight thermowell

Time 15 s 20 s 25 s

Response times for thermocouple assemblies with thermowell are provided for general design guidance without transmitter.

When the temperature of a process media changes, the output signal of a Thermocouple assembly follows this change after a certain time delay. The physical cause is the time related to heat transfer from the process media through the thermowell and the insert to the sensor element (thermocouple). The manner in which the reading follows the change in temperature of the assembly over time is referred to as the response time. Variables that influence or impact the response time are:

• Wall thickness of thermowell

• Spacing between thermocouple insert and thermowell

• Sensor packing

• Process parameters such as media, flow velocity, etc.

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T53, T54 and T55

Maximum measured error

Transmitter long-term stability

Insulation resistance

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%

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.

Orientation

Installation instructions

Installation conditions

No restrictions.

A0025312

 3 Installation examples

A-C In pipes with a small cross section the thermowell tip should reach or extend slightly past the center line of

the pipe (= U) B Threaded, angled installation of T53 assembly C Flange installation of T54 assembly

The immersion length of the thermometer influences the accuracy. If the immersion length is too small then errors in the measurement are caused by heat conduction via the process connection and the container wall. If installing into a pipe then the immersion length should be at least half of the pipe diameter. A further solution could be an angled (tilted) installation (see B). When determining the immersion length all thermometer parameters and the process to be measured must be taken into account (e.g. flow velocity, process pressure).

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