Endress+Hauser S TC88 Specifications

TI01098T/09/EN/04.19 71428883 2019-01-17

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Technical Information

Omnigrad S TR88, TC88

Modular Thermometer

TR88 with resistance insert (RTD) TC88 with thermocouple insert (TC) Extension neck and threaded connection for installation in an existing thermowell

Application

• Universal range of application

• Suitable for installation in already existing thermowells

• 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)

• 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 as per DIN EN 50446 and customer-specific immersion lengths

• Variable total length in suitable thermowells thanks to compression fitting on extension neck

• Types of protection for use in hazardous locations: – 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).

Omnigrad S TR88, TC88

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.

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Omnigrad S TR88, TC88

20-250V DC/AC

4...20 mA

24V DC / 30 mA

°C

1 2

6 7

Measuring system

A0012641

 1 Application example

A Thermometer with fitted head transmitter mounted in an existing onsite thermowell 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").

Equipment architecture

A0012672

 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 Complete thermometer with terminal head 4 Thermowell connection: Threaded connection on extension neck 5 Thermowell connection: Adjustable compression fitting on the extension neck. Possible maximum length of

the extension neck E as basic condition for the nominal calculation of the insertion length IL.

6 Thermowell connection: Adjustable compression fitting on the extension neck. The length E can be adjusted

7 Existing onsite thermowell located in the process 8 Version without extension neck, if thermowell and extension neck are present on site in the process (E = 0

E Length of extension neck IL Insertion length ML Insertion length for existing onsite components

during the installation.

mm)

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Omnigrad S TR88, TC88

Thermometers from the Omnigrad S TR88 and TC88 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. If installed in a thermowell the insert can be exchanged and calibrated without interrupting the process. The insert has flying leads, a ceramic connection socket or mounted temperature transmitter. The thermometers are designed for installation in an existing onsite thermowell. Different threaded connections are available on the bottom of the extension neck for installation in the thermowell. Insofar as the thermowell is suited to this purpose, the thermometer may also be mounted using a suitable compression fitting on the extension neck. This means that thermometers with a fixed insertion length (ML) can be used variably, even in thermowells of varying length, and can be installed in such a way that an optimum thermal contact is guaranteed between the tip of the insert and the bottom of the thermowell.

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 range

Terminal head Temperature in °C (°F)

Without mounted head transmitter

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

With mounted head transmitter and display

Process pressure

The maximum process pressure depends on the thermowell into which the thermometer is screwed. For an overview of the Endress+Hauser thermowells which may be used, see →  22.

Permitted flow rate as a function of immersion length

The maximum permitted flow rate to which the thermometer can be subjected, reduces the greater the immersion depth of the thermowell in the flowing medium. In addition, it is dependent on the diameter of the tip of the thermowell, the medium type, process temperature and process pressure. For an overview of the Endress+Hauser thermowells which may be used, see →  22 .

Depends on the terminal head used and the cable gland or fieldbus connector, see 'Terminal heads' section

–20 to 70 °C (–4 to 158 °F)

Shock and vibration resistance

The Endress+Hauser inserts meet the requirements of IEC 60751 which specify shock and vibration resistance of 3g in the range from 10 to 500 Hz. The vibration resistance at the measuring point depends on the sensor type and design, see the following table:

Version Vibration resistance for the sensor tip

Pt100 (WW or TF) 30 m/s² (3g)

iTHERM StrongSens Pt100 (TF) > 600 m/s² (60g)

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Omnigrad S TR88, TC88

-200 -100 0 100 200 300 400 500 600°C

0.5

1.0

1.5

2.0

2.5

3.0

- 0.5

- 1.0

- 1.5

- 2.0

- 2.5

- 3.0

Max. deviation (°C)

Accuracy

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

RTD resistance thermometer as per IEC 60751

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|

(333 to 750 °C)

(333 to 1 200 °C)

Deviation, the larger respective value applies

J (Fe-CuNi) ±2.2 K or ±0.0075 |t|

K (NiCrNiAl)

±2.2 K or ±0.02 |t| ±2.2 K or ±0.0075 |t|

1 ±1.5 °C (–40 to 375 °C)

±0.004 |t|

1 ±1.5 °C (–40 to 375 °C)

±0.004 |t|

(0 to 760 °C) ±1.1 K or ±0.004 |t|

(0 to 760 °C)

(–200 to 0 °C)

(0 to 1 260 °C)

±1.1 K or ±0.004 |t| (0 to 1 260 °C)

(375 to 750 °C)

(375 to 1 000 °C)

Class Max. tolerances (°C) Characteristics

Cl. AA, former 1/3

± (0.1 + 0.0017 · |t|

)

Cl. B

Cl. A ± (0.15 + 0.002 · |t|)

Cl. B ± (0.3 + 0.005 · |t|)

Temperature ranges for compliance with the tolerance classes

Wire wound sensor (WW):

Cl. A Cl. AA

–

–50 to +250 °C

100 to +450 °C

Thin-film version

Cl. A Cl. AA

(TF):

• Standard

• iTHERM StrongSens

–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.

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A0008588-EN

Omnigrad S TR88, TC88

Response time

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

Insert:

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

< 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

5 s

1 s

2.5 s

7 s

Insulation resistance

Dielectric strength

Self heating

Calibration

Response time for the sensor assembly without transmitter.

• 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).

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Omnigrad S TR88, TC88

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.

Material

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)

Extension neck, insert and process connection.

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

AISI 316L/

1.4404

1.4435

AISI 316Ti/

1.4571

Alloy 600/

2.4816

Short form Recommended

max. temp. for continuous use in air

X2CrNiMo17-12-2 X2CrNiMo18-14-3

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

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

650 °C (1 202 °F)

Properties

• Austenitic, stainless steel

• High corrosion resistance in general

• Particularly high corrosion resistance in chlorinebased 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

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

1) Can be used to a limited extent up to 800 °C (1472 °F) for low compressive loads and in non-corrosive media. Please contact your Endress+Hauser sales team for further information.

Components

Family of temperature transmitters

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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.

Omnigrad S TR88, TC88

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 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

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