Endress+Hauser M TR12 Specifications

Technical Information

Omnigrad M TR12

Modular RTD assembly protection tube and compression fitting

Application

• Universal range of application

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

• Pressure range up to 40 bar (580 psi)

• Degree of protection: up to IP 68

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

• FOUNDATION Fieldbus™

Your benefits

• High flexibility due to modular assembly with standard terminal heads and customized immersion length

• Highest possible compatibility with a design according to DIN 43772

• Fast response time with reduced/tapered tip form

• Types of protection for use in hazardous locations: Intrinsic Safety (Ex ia) Non-Sparking (Ex nA)

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TR12

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  at 0 °C (32 °F) and a temperature coefficient  = 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

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Example of an application

A Built-in RTD assembly TR12 with head transmitter B RIA261 Field display

– The display measures an analog measurement signal and indicates this on the display. The display is connected in a

4 to 20 mA current loop and also derives its supply from the loop. The voltage drop is almost negligible (< 2.5 V). The dynamic internal resistance (load) makes sure that independently from the loop current, the maximum voltage drop is never exceeded. The analog signal at the input is digitalized, analyzed, and shown in the rear illuminated display. For details see Technical Information (see chapter "Documentation").

C Active barrier RN221N

– The RN221N active barrier (24 V DC, 30 mA) has a galvanically isolated output for supplying voltage to loop powered

transmitters. The power supply has a wide-range input for mains power, 20 to 250 V DC/AC, 50/60 Hz to be used in any electrical circuit. For details see Technical Information (see chapter "Documentation").

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TR12

Equipment architecture

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Equipment architecture of the Omnigrad M TR12

1 2Insert ( 3 mm, 0.12 in) with mounted head

transmitter, for example Insert ( 6 mm, 0.24 in) with mounted ceramic

terminal block, for example 3 Terminal head L Immersion length 4 Protection armature IL Insertion length = L + 35 mm (1.38 in) 5 Compression fittings TA50, TA70 as process connection

The Omnigrad M TR12 RTD assemblies are modular. The terminal head serves as a connection module for the protection armature in the process as well as for the mechanical and electrical connection of the measuring insert. The actual RTD sensor element is fitted in and mechanically protected within the insert. The insert can be exchanged and calibrated even during the process. Either ceramic terminal blocks or transmitters can be fitted to the internal base washer. The TR12 can be fitted onto a pipe or tank through the use of a compression fitting, which can be chosen from the most common models (see  ä 13).

Measurement range -200...+600 °C (-328...+1112 °F)

Various tip shapes - detailed information see chapter ’tip shape’:

Reduced or tapered for inserts with  3 mm (0.12 in)

Straight or tapered for inserts with  6 mm (0.24 in)

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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 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)

Process pressure

The maximum allowable process pressure depends on the process connection used. See the "Process connection" section,  ä 13 for an overview of the process connections that can be used.

Maximum flow velocity

The highest flow velocity tolerated by the protection tube diminishes with increasing immersion length exposed to the stream of the fluid. Detailed information may be taken from the figures below.

TR12

tor, see 'Terminal heads' section,  ä 9

Flow velocity depending on the immersion length – Protection tube diameter 9 x 1 mm (0.35 in) ----------– Protection tube diameter 12 x 2.5 mm (0.47 in) - - - - - -

A Medium water at T = 50 °C (122 °F) L Immersion length B Medium superheated steam at T = 400 °C (752 °F) v Flow velocity

Shock and vibration resistance

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

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TR12

Accuracy RTD corresponding to IEC 60751

Class max. Tolerances

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|

(°C)

± (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

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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:

Protection tube

Diameter Response

time

9 x 1 mm (0.35 in) t

11 x 2 mm (0.43 in)

12 x 2.5 mm (0.47 in)

Note! Response time for the sensor assembly without transmitter.

Reduced tip  5.3 mm (0.2 in)

7.5 s 21 s

not available not available

Tapered tip

 6.6 mm (0.26 in) or  9 mm (0.35 in)

11 s 37 s

not available not available

11 s 37 s

Straight tip

18 s 55 s

38 s 125 s

Insulation resistance Insulation resistance 100 M at ambient temperature.

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

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TR12

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 Protection tube, 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

AISI310/

1.4841

X2CrNiMo17-12-2 X2CrNiMo18-14-3

X6CrNiMoTi17-12-2 700 °C (1292 °F)

X15 CrNiSi 25 20 1100 °C (2012 °F) • Good resistance to thermal, mechanical and corrosive influences

temperature for continuous use in air

650 °C (1200 °F)

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

Similar but better properties than AISI 316L Less resistant against sulfurous gasses Application areas: – Garbage incinerators – Industrial furnace construction – Heating plant construction

Minimum insertion length IL in mm (in)

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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