Endress+Hauser Omnigrad M TR44, Omnigrad M TR45 Technical Information

Technical Information

Omnigrad M TR44, TR45

Hygienic, modular RTD assembly,
thermowell for TR45,
various process connections and neck tube

Application

• All hygienic applications for food, pharmaceutical and
fine chemicals industries

• Measuring range: -50...400 °C (-58...752 °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® PA

• FOUNDATION Fieldbus™

®

Your benefits

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

• Providing most common hygienic process connections
with EHEDG certification and hygienic design due to
3-A® guidelines

• High accuracy with Pt100 sensors according
to IEC 60751 (class A or better)

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

4 5 0

TI244T/02/en
71073141

TR44, TR45

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

a0008948

Example of an application

A Built-in RTD assembly TR44 or TR45 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

TR44, TR45

Equipment architecture

TR44

3

E

4

5

L

666a 6b 6c

Equipment architecture of the Omnigrad M TR44 (non-replaceable insert) and TR45 (replaceable insert)

12Insert (∅ 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 Various terminal heads E Neck tube
4 Protection armature L Immersion length
5 Various hygienic process connections, detailed

information see chapter ’process connection’

TR45

3

10 mm
(0.4 in)

E

5

L

6
6a
6b
6c

IL TR45 Insertion length = E + L + 10 mm (0.4 in)

E

4

L

Various tip shapes, detailed information see chapter ’tip shape’:
Straight and reduced for TR44
Tapered and reduced for TR45 inserts with ∅ 3 mm (0.12 in)
Straight for TR45 inserts with ∅ 6 mm (0.24 in)

12

IL

IL

a0009567

The RTD assemblies Omnigrad M TR44 and TR45 are built up for hygienic processes and the main
requirements regarding "Cleaning-in-process" (CIP) and "Sterilization-in-process" (SIP). The architecture is
according to 3-A

®

standard. The hygienic process connections are easy to clean and thus they are complient
with EHEDG. The thermometers can be installed in the process (pipe or tank) using a hygienic process
connection. The most common process connections are available.

• Omnigrad M TR44 RTD assemblies consist of a terminal head and a protection armature with integrated

insert. With a diameter of 6 mm (0.24 in) resp. 8 mm (0.31 in) reduced to 5.3 mm (0.21 in) at the tip, it is
possible to realize best thermal response times. Insert and neck tube are welded together. The hygienic
process connection is also fixed connected to the neck tube.

• The Omnigrad M TR45 RTD assemblies are constructed in three modules: terminal head, protection

armature and a replaceable insert. The protection armature consists of a neck tube, process connection
welded between neck tube and integrated thermowell.

Measurement range • TR44: -50 °C…250 °C (-58 °F...482 °F)

• TR45: -50 °C…400 °C (-58 °F...752 °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)

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

Endress+Hauser 3

TR44, TR45

Permitted process pressure at the protection armature

The maximum process pressure is 40 bar (600 psi). It is limited further by the process connection in question.
See → ä 13.

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).

Maximum flow velocity TR44

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

a0008065-en

a0008967

Maximum flow velocity TR45
– Tube diameter 9 x 1 mm (0.35 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

TR44, TR45

Shock and vibration resistance 4g / 2 to 150 Hz as per IEC 60068-2-6

Accuracy RTD corresponding to IEC 60751

Class max. Tolerances

(°C)

Temperature
range

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

Cl. A ± (0.15 + 0.002 · |t|1)) -50 °C to +250 °C

C. AA, former

± (0.1 + 0.0017 · |t|1)) 0 °C to +150 °C

1/3 Cl. B

Cl. B ± (0.3 + 0.005 · |t|

1)

) -50 °C to +400 °C

Characteristics

2)

a0008965-en

1) |t| = absolute value °C

2) For TR44: -50 °C to 200 °C

!

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

Response time Tests of the sensor assemblies without transmitter in water at 0.4 m/s (1.3 ft/s), according to IEC 60751;

10 K temperature step change; For immersion length L > 45 mm (1.77 in):

Thermometer TR44 without thermowell

Outer diameter Response time Reduced tip ∅ 5.3 mm (0.2 in) Straight tip ∅ 6 mm (0.24 in)

8 mm (0.31 in) t

t

6 mm (0.24 in) t

t

TR45 with thermowell

Diameter Response

time

9 x 1 mm
(0.35 in)

t

50

t

90

50
90

50
90

Reduced tip
∅ 5.3 mm (0.2 in)

1)

A

7.5 s
21 s

≤ 3 s
≤ 7 s

not available
not available

2)

B

3.5 s
8 s

Tapered tip
∅ 6.6 mm (0.26 in)

A

11 s
37 s

1)

2)

B

5 s
12 s

not available
not available

≤ 4s
≤ 10 s

Straight tip
∅ 9 mm (0.35 in)

1)

A

18 s
55 s

2)

B

10 s
30 s

1) without thermally conductive paste

2) with thermally conductive paste

Endress+Hauser 5

TR44, TR45

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 -50 to +400 °C (-58 to 752 °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.

TR44 (the complete thermometer is calibrated)
TR45 (only the measurement instert is calibra­ted)

Temperature range without head transmitter with head transmitter

-80 °C < -40 °C (-110 °F < -40 °F) 200 (7.9)

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

0 °C to 250 °C (32 °F to 480 °F) 120 (4.7) 150 (5.9)

250 °C to 400 °C (480 °F to 752 °F) 300 (11.8)

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

Short form Recommended max.

temperature for
continuous use in air

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

1)

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

Minimum standard immersion length L in mm (inch)

(thermometer without neck)

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.

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

6 Endress+Hauser

TR44, TR45

System 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

HART® communication is all about easy, reliable data access and getting additional information about the
measurement point more inexpensively. iTEMP® transmitters integrate seamlessly into your existing control
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

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

• Terminals: Cable up to max. max. ≤ 2.5 mm
with 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’)

2

/ 16 AWG (secure screws) or

®

-handheld terminal with alligator

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

®

PROFIBUS

Universally programmable head transmitter with PROFIBUS

PA TMT84 head transmitter

®

PA communication. Converting various input
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’).

FOUNDATION Fieldbus™ TMT85 head transmitter

Universally programmable head transmitter with FOUNDATION fieldbus™ communication. Converting
various input 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 ControlCare from Endress+Hauser or the NI Configurator from National
Instruments.
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’).

Endress+Hauser 7

Type of transmitter Specification

®

iTEMP

TMT84 and TMT85

• Spring range L ≥ 5 mm (0.2"), see Pos. A

• Fixing elements for pluggable measured value display, see Pos. B

• Interface for contacting measured value display, see Pos. C

• Material (RoHS-compliant)
Housing: PC
Potting: PU

•Terminals:
Screw terminals (cable up to max. ≤ 2.5 mm
or spring terminals (e. g. from 0.25 mm
for flexible wires with wire-end ferrules with plastic ferrule)

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

a0007301-en

Details see Technical Information (see chapter ’Documentation’)

Pluggable display TID10 as option

• Displays the actual measured value and the measurement point identification

• Displays fault events in inverse color with channel ident and diagnostics code

• DIP-switches on the rear for hardware set-up, e. g. PROFIBUS
address

Note!

!

Display is only available with suitable terminal head with display window, e.g.
TA30

TR44, TR45

2

/ 16 AWG)

2

to 0.75 mm2/ 24 AWG to 18 AWG

®

PA bus

a0009955

8 Endress+Hauser

TR44, TR45

Terminal heads All terminal heads have internal geometry according to DIN 43729, form B and thermometer connection

M24x1.5.
All dimensions in mm (inch). All cable gland dimensions in the graphics are based on SKINTOP ST M20x1.5

TA20A Specification

• Degree of protection: IP66

• Max. temperature: 100 °C (212 °F)

• Material: aluminum alloy, rubber seal under the cover

• Cable entry: G ½", NPT ½" or M20x1.5; plug: M12x1 PA

• Protection armature connection: M24x1.5, NPT ½" or G ½"

• Head color: blue RAL 5012, epoxy resin coating

• Cap color: grey RAL 7035, epoxy resin coating

• Weight: 180 g (6.35 oz)

®

•3-A

marked

a0008650

TA30A Specification

107.5 (4.23)

• Degree of protection: IP66/68

• Max. temperature: 150 °C (300 °F)

• Material: aluminum, polyester powder coated
Seals: silicone

• Cable entry incl. glands: ½" NPT and M20x1.5, only thread: G ½",
plugs: M12x1 PA, 7/8" FF

70 (2.76)

15.5 (0.6)

• Protection armature connection: M24x1.5

• Head color: blue RAL 5012

• Cap color: grey RAL 7035

28

(1.1)

• Weight: 330 g (11.64 oz)

78 (3.1)

a0009820

TA30A with display window Specification

• Degree of protection: IP66/68

• Max. temperature: 150 °C (300 °F)

• Material: aluminum, polyester powder coated
Seals: silicone

• Cable entry incl. glands: ½" NPT and M20x1.5, only thread: G ½",
plugs: M12x1 PA, 7/8" FF

• Protection armature connection: M24x1.5

• Head color: blue RAL 5012

• Cap color: grey RAL 7035

• Weight: 420 g (14.81 oz)

• Head transmitter optional with TID10 display

a0009821

Endress+Hauser 9