Endress+Hauser M TR11 Specifications

TI00257T/02/EN/13.19 71443089

Products Solutions Services

Technical Information

Omnigrad M TR11

Modular RTD assembly protection tube, thread

Application

• Universal range of application

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

• Pressure range up to 75 bar (1088 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® PA

•FOUNDATION Fieldbus™

Your benefits

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

• 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:

customized immersion length

Intrinsic Safety (Ex ia) Non-Sparking (Ex nA)

TR11

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).

-1

Measuring system

a0009536

Example of an application

A Built-in RTD assembly TR11 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").

2 Endress+Hauser

TR11

Equipment architecture

Equipment architecture of the Omnigrad M TR11

Various tip shapes - detailed information see chapter ’tip

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 + 45 mm (1.8 in) 5 Threads as process connection

shape’:

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

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

Neck tube = 35 mm (1.4 in)

a0009537

The Omnigrad M TR11 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. TR11 RTD assemblies are constructed without a neck.

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

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

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

With mounted head transmitter and display

connector, see 'Terminal heads' section,   10

-20 to 70 °C (-4 to 158 °F)

Endress+Hauser 3

TR11

Process pressure

The pressure values to which the actual protection tube can be subjected at the various temperatures and maximum permitted flow velocity are illustrated by the figure below. Occasionally, the pressure loading capacity of the process connection can be considerably lower. The maximum allowable process pressure for a specific thermometer is derived from the lower pressure value of the thermowell and process connection.

a0008604-en

Maximum permitted process pressure for tube diameter, limited to 75 bar (1088 psi) by the threaded process connection – 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) P Process pressure BLMedium superheated steam at T = 400 °C (752 °F)

Immersion length

Maximum permitted process pressure,

max.

limited by the process connection

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.

a0008605-en

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

4 Endress+Hauser

TR11

Shock and vibration resistance

Endress+Hauser inserts comply the IEC 60751 requirements stating a shock and vibration resistance of 3g within a range of 10...500 Hz. The vibration resistance of the measurement point depends on sensor type and construction. Refer to the following table:

Sensor type Vibration resistance for the thermowell tip

• Pt100 (WW or TF)) • 30 m/s² (3g)

•iTHERM

StrongSens Pt100 (TF)

QuickSens Pt 100 (TF), version Ø 6

mm (0.24 in)

1) Vibration resistance valid also for iTherm Quickneck.

Accuracy RTD corresponding to IEC 60751

• > 600 m/s² (60g)

Class max. Tolerances

(°C)

RTD max. error type TF - range:

Cl. A ± (0,15 + 0,002 · |t|1))

Cl. AA, for-

± (0,1 + 0,0017 · |t|

mer 1/3 Cl. B

Cl. B ± (0,3 + 0,005 · |t|

)

Characteristics

)

a0008588-DE

1) |t| = absolute value °C

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

Endress+Hauser 5

TR11

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)

11 x 2 mm (0.43 in)

12 x 2.5 mm (0.47 in)

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

Response time for the sensor assembly without transmitter.

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.

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 iTEMP

temperature transmitter (very small measurement

current) is connected.

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)

Minimum insertion length IL in mm (in)

6 Endress+Hauser

+ 14 hidden pages