Endress+Hauser S TR88 Specifications

Technical Information

Omnigrad S TR88

Modular RTD assembly Extension neck and threaded connection for installation in an existing thermowell

Application

• Universal application

• Suitable for installation in already existing thermowells

• Measuring range: -200 to +600 °C (-328 to +1112 °F)

• Installation without thermowell possible in unpressurized processes

• Degree of protection up to IP 68

• Replaceable insert

Head transmitters

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...20 mA

•HART

•PROFIBUS® PA

• FOUNDATION Fieldbus™

Your benefits

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

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TI271T/02/en 71107907

TR88

Function and system design

Measuring principle These resistance thermometers use a Pt100 temperature sensor according to IEC 60751. This 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

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 (1112 °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).

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Measuring system

a0012641

Example of an application

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 active barrier (24 V DC, 30 mA) has an 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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TR88

Equipment architecture

a0012672

Thermometer design

12Insert (∅ 3 mm, 0.12 in) with mounted

head transmitter (example) Insert (∅ 6 mm, 0.24 in) with mounted ceramic connection socket (example)

34Terminal head

Thermowell connection: Threaded connection or compression fitting on extension neck

The resistance thermometers from the Omnigrad S TR88 series have a modular design. The terminal head is used as a connection module for the mechanical and electrical connection of the insert. The actual sensor element of the resistance thermometer sits in the insert and is mechanically protected. If installed in a thermowell, the insert can be replaced and calibrated directly in the process. Either ceramic connection sockets or transmitters can be mounted on the internal connection socket. The TR88 is 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 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 -200...+600 °C (-328...+1112 °F)

Performance characteristics

Existing onsite thermowell located in the process

Version without extension neck, if thermowell and extension neck are present on site in the process

Length of extension neck

ILMLTotal length of insert = ML + E + 10 mm (0.4 in)

Insertion length for existing onsite components

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 connec-

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

With mounted head transmitter and display -20 to 70 °C (-4 to 158 °F)

tor, see 'Terminal heads' section, → ä 8

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 → ä 17.

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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 → ä 17.

Shock and vibration resistance

3g / 10 to 500 Hz as per IEC 60751 (RTD-Thermometer)

Accuracy RTD corresponding to IEC 60751

TR88

Class max. Tolerances

(°C)

RTD max. error type TF - range: -50 to +400 °C

Cl. A ± (0.15 + 0.002 · |t|

Cl. AA, former 1/3 Cl. B

Cl. B ± (0.3 + 0.005 · |t|

RTD max. error type WW - range: -200 to +600 °C

Cl. A ± (0.15 + 0.002 · |t|

Cl. AA, former 1/3 Cl. B

Cl. B ± (0.3 + 0.005 · |t|

± (0.1 + 0.0017 · |t|

Temperature range Characteristics

) -50 °C to +250 °C

) 0 °C to +150 °C

) -50 °C to +400 °C

) -200 °C to +600 °C

) 0 °C to +250 °C

) -200 °C to +600 °C

a0008588-en

1) |t| = absolute value °C

Note! For measurement errors in °F, calculate using equations above in °C, then multiply the outcome by 1.8.

Response time Tests in water at 0.4 m/s (1.3 ft/s), according to IEC 60751; 10 K temperature step change. Measuring probe

Pt100, TF/WW:

Insert diameter Response time

3.5 s 8 s

2 s 5 s

6 mm (0.24 in) t

3 mm (0.12 in) t

Note! Response time for RTD insert without transmitter.

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TR88

Insulation resistance Insulation resistance ≥100 MΩ at ambient temperature.

Insulation resistance between each terminal and the sheath is measured with a voltage of 100 V DC.

Self heating RTD elements are passive resistances that are measured using an external current. This measurement current

causes a self heating 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 self heating error is negligible when an Endress+Hauser

temperature transmitter (very small measurement current) is connected.

iTEMP

Calibration specifications Endress+Hauser provides comparison temperature calibration from -80 to +600 °C (-110 °F to 1112 °F) based

on the International Temperature Scale (ITS90). Calibrations are traceable to national and international standards. The calibration report is referenced to the serial number of the thermometer. Only the measurement insert is calibrated.

Insert-Ø: 6 mm (0.24 in) and 3 mm (0.12 in)

Temperature range without head transmitter with head transmitter

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

-40 °C to 0 °C (-40 °F to 32 °F) 160 (6.3)

0 °C to 250 °C (32 °F to 480 °F) 120 (4.72) 150 (5.9)

250 °C to 550 °C (480 °F to 1020 °F) 300 (11.81)

550 °C to 650 °C (1020 °F to 1202 °F) 400 (15.75)

Material Neck, measuring insert.

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.

AISI 316L/

1.4404

1.4435

AISI 316Ti/

1.4571

X2CrNiMo17-12-2 X2CrNiMo18-14-3

X6CrNiMoTi17-12-2 700 °C (1292 °F)

temperature for continuous use in air

650 °C (1200 °F)

Minimum insertion length IL in mm (inch)

Properties

• 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

• Properties comparable to AISI316L

• 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

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.

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Transmitter specifications

TR88

TMT180

PCP

Pt100

Measurement accuracy 0.2 °C (0.36 °F), optional

0.1 °C (0.18 °F) or 0.08%

% is related to the adjusted measurement range (the larger value applies)

Sensor current I ≤ 0.6 mA I ≤ 0.2 mA I ≤ 0.3 mA

Galvanic isolation (input/output) - Û = 2 kV AC

TMT181

PCP

Pt100, TC, Ω, mV

0.2 °C (0.36 °F) or 0.08% 0.1 °C (0.18 °F)

TMT182

HART

Pt100, TC, Ω, mV

TMT84 PA / TMT85 FF

Pt100, TC, Ω, mV

Components

Family of temperature transmitters

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

PC programmable head transmitter TMT180 and TMT181

They offer a high degree of flexibility, thereby supporting universal application with low inventory storage. The

transmitters can be configured quickly and easily at a PC. Endress+Hauser offers the ReadWin® 2000

iTEMP configuration software for this purpose. This software can be downloaded free of charge at www.readwin2000.com. More information can be found in the Technical Information (see "Documentation" section).

TMT182 head transmitter

HART

communication is all about easy, reliable data access and getting additional information about the

measurement point more inexpensively. iTEMP

system and provide painless access to numerous diagnostic information. Configuration with a hand-held (Field Xpert SFX100 or DXR375) or a PC with configuration program (FieldCare, ReadWin

2000) or configure with AMS or PDM. Details see Technical Information (see chapter

’Documentation’).

Type of transmitter Specification

iTEMP

TMT18x

PROFIBUS

R09-TMT182ZZ-06-06-xx-en-001

PA TMT84 head transmitter

• Material: Housing (PC), Potting (PUR)

• Terminals: Cable up to max. ≤ 2.5 mm wire end ferrules

• Eyelets for easy connection of a HART clips

• Degree of protection NEMA 4 (see also type of terminal head)

Details see Technical Information (see chapter ’Documentation’)

Universally programmable head transmitter with PROFIBUS signals into a digital output signal. High accuracy over the complete ambient temperature range. Swift and easy operation, visualization and maintenance using a PC directly from the control panel, e. g. using operating software such as FieldCare, Simatic PDM or AMS. Benefits are: dual sensor input, highest reliability in harsh industrial environments, mathematic functions, thermometer drift monitoring, sensor back-up functionality, sensor diagnosis functions and sensor-transmitter matching using Callendar-Van Dusen coefficients. Details see Technical Information (see chapter ’Documentation’).

transmitters integrate seamlessly into your existing control

/ 16 AWG (secure screws) or with

-handheld terminal with alligator

PA communication. Converting various input

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