Endress+Hauser S TR66 Specifications

Technical Information

Omnigrad S TR66

Modular RTD assembly, flameproof
Barstock thermowell, with thread or flange

Application

• Heavy duty applications

• Oil & Gas processing industry

• Measuring range: -200...600 °C (-328...1115 °F)

• Static pressure range up to 500 bar (7250 PSI)

• Protection class: 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 based on modular assembly with a
terminal head and customized immersion length

• Extension neck for head transmitter heat protection

• Types of protection for use in hazardous locations:
Flameproof (Ex d)
Intrinsic Safety (Ex ia)
Non-Sparking (Ex nA)
Dust ignition proof (protection by enclosure)

4 0

TI284T/02/en
71078770

TR66

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).

-1

.

Measuring system

a0010191

Example of an application

A RIA 261 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 volt drop is almost negligible
(< 2.5 V). The dynamic internal resistance (load) makes sure that independently from the loop current, the
maximum volt drop is never exceeded. The analog signal at the input is digitalized, analyzed and displayed. For
details see Technical Information (see "Documentation").

B 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 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 "Documentation").

C Built-in RTD assembly TR66 with head transmitter

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TR66

Equipment architecture

a0010220

Equipment architecture of the Omnigrad S TR66

1 Insert TPR100, ∅ 6 mm (0.24 in) with mounted head

transmitter, for example. For applications in non-hazardous
areas (except: Ex ia and Ex nA)

2 Insert TPR300, ∅ 6 mm (0.24 in) with mounted ceramic

terminal block, for example.

For applications in hazardous areas (Ex d)
3 Terminal head IL Insertion length = U + T + N + 41 mm (1.6 in)
4Extension neck

The Omnigrad S TR66 RTD assemblies are modular. The terminal head serves as a connection module for the
extension neck to the thermowell 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. Where required, threads or flanges can be fixed onto the thermowell.

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 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)

5

Thread or flange as process connection

6

Thermowell from bar stock material

N

Extension neck length

T

Thermowell lag

U

Immersion length

A

Thermowell length (= U + T)

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

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TR66

Process pressure (static)

Process connection Standard Max. process pressure

Thread ANSI B1.20.1 75 bar (1088 psi)

Flange ASME B16.5 Depending on flange pressure stage

150, 300 or 600 psi

Permitted flow velocity depending on the immersion length

The highest flow velocity tolerated by the thermometer diminishes with increasing immersion length exposed
to the stream of the fluid. In addition it is dependent on the diameter of the thermometer tip, on the kind of
measuring medium, on the process temperature and on the process pressure. The following figures exemplify
the maximum permitted flow velocities in water and superheated steam at a process pressure of 4 MPa
(40 bar = 580 PSI).

!

a0010219

Maximum flow velocity

--------------- Thermowell ∅ D1 = 35 mm (1.38 in), ∅ Q1 = 25 mm (0.98 in), ∅ Q2 = 18 mm (0.71 in)

- - - - - - - - Thermowell ∅ D1 = 30 mm (1.18 in), ∅ Q1 = 20 mm (0.8 in), ∅ Q2 = 14 mm (0.55 in)

A Medium water at T = 50 °C (122 °F) U Immersion length thermowell, material 1.4401 (316)
B Medium superheated steam at T = 400 °C (752 °F) v Flow velocity

Note!
Information on the thermowell dimensions ∅ Q1, ∅ Q2, ∅ D1, ∅ Df and U, → ä 10.

Shock and vibration resistance

4g / 2 to 150 Hz as per IEC 60068-2-6

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TR66

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|

± (0.1 + 0.0017 · |t|

Temperature range Characteristics

1)

) -50 °C to +250 °C

1)

) 0 °C to +150 °C

1)

) -50 °C to +400 °C

1)

) -200 °C to +600 °C

1)

) 0 °C to +250 °C

1)

) -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:

∅ Q1 thermowell Response time ∅ Q2 tapered tip

!

20 mm (0.79 in) t

t

25 mm (0.98 in) t

t

34 s

50

105 s

90

37 s

50

115 s

90

Note!
Response time for the RTD insert without transmitter.

14 mm (0.55 in)

18 mm (0.71 in)

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

Endress+Hauser 5

TR66

Calibration specifications The manufacturer provides comparison temperature calibration from -80 to +600 °C (-110 °F to 1112 °F) 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 measuring insert is
calibrated.

Insert: Ø 6 mm (0.24 in) Minimum insertion length (IL) in mm (inch)

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 (5.91)

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 Extension neck and thermowell

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

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

Short form Recommended max.

temperature for
continuous use in air

650 °C (1200 °F)
X2CrNiMo17-12-2
X2CrNiMo18-14-3

X6CrNiMoTi17-12-2 700 °C (1292)

for further information.

Properties

1)

1)

• 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

Transmitter specifications

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 Ι ≤ 0.6 mA Ι ≤ 0.2 mA Ι ≤ 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

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