TI01298T/09/EN/04.23-00
71637644
2023-09-25

Products

Solutions

ServicesTechnical Information
iTHERM TMS21
MultiSens Slim
Minimally invasive, flexible TC multipoint
thermometer for petrochemical and chemical
applications

Application• Easy-to-use thermometer with flexible design, for use in measuring applications
with direct contact and fast measurements• Specifically designed for light chemical processes• Thermocouple (TC) measuring range:• Standard: –270 to 920 °C (–454 to 1 688 °F)• ATEX/IECEx: –50 to 440 °C (–58 to 824 °F)• Static pressure range: Up to 90 bar (1 305 psi). Specific maximum pressure
achievable depending on process type and temperature• For installation in a container, reactor, tank, or similarYour benefits• High degree of flexibility thanks to a wide variety of options for an easy productconfiguration selection and process integration• High precision temperature profile detection due to an high number of measuring
points - up to 59 points• Easy process monitoring thanks to low invasiveness and high installation flexibility• Fast response time
• Compliance to several national and international standards, such as IEC60584,
ASTM E230 and IEC 60751• Wide range of accessories for the best process integration and monitoring as well
as for protection against mechanical shocks and environmental conditions• Adjustable immersion length to reach the exact measuring point location

iTHERM TMS21 MultiSens Slim

Table of contents
Function and system design . . . . . . . . . . . . . . . . . . . 3

Measuring principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Measurement system . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Equipment architecture . . . . . . . . . . . . . . . . . . . . . . . . . 4

Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Document function . . . . . . . . . . . . . . . . . . . . . . . . . . .

20

Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Measured variable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7Output signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Family of temperature transmitters . . . . . . . . . . . . . . . . . 6

Wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Performance characteristics . . . . . . . . . . . . . . . . . . . 8

Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Response time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additional tests (on request) . . . . . . . . . . . . . . . . . . . . . .
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8
8
9
9

Mounting procedure . . . . . . . . . . . . . . . . . . . . . . . . . 9

Installation point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installation instructions . . . . . . . . . . . . . . . . . . . . . . . . 10

Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Ambient temperature range . . . . . . . . . . . . . . . . . . . . .
Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . .
Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Degree of protection . . . . . . . . . . . . . . . . . . . . . . . . . .
Electromagnetic compatibility (EMC) . . . . . . . . . . . . . . .

11
11
11
11
11

Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Process temperature range . . . . . . . . . . . . . . . . . . . . . . 11
Process pressure range . . . . . . . . . . . . . . . . . . . . . . . . . 11

Mechanical construction . . . . . . . . . . . . . . . . . . . .

Design, dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Materials of insert sheath, thermowell, main bushing and
all wetted parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Process connection . . . . . . . . . . . . . . . . . . . . . . . . . . .

12

12
15

15
16

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Certificates and approvals . . . . . . . . . . . . . . . . . . .

16

Ordering information . . . . . . . . . . . . . . . . . . . . . . . 17
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Device-specific accessories . . . . . . . . . . . . . . . . . . . . . .
Communication-specific accessories . . . . . . . . . . . . . . . .
Service-specific accessories . . . . . . . . . . . . . . . . . . . . . .

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18
19
20

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iTHERM TMS21 MultiSens Slim

Function and system design
Measuring principle

Thermocouples (TC)
Thermocouples are comparatively simple, robust temperature sensors which use the Seebeck effectfor temperature measurement: if two electrical conductors made of different materials are connected
at a point, a weak electrical voltage can be measured between the two open conductor ends if the
conductors are subjected to a thermal gradient. This voltage is called thermoelectric voltage orelectromotive force (emf.). Its magnitude depends on the type of conducting materials and thetemperature difference between the "measuring point" (the junction of the two conductors) and the"cold junction" (the open conductor ends). Accordingly, thermocouples primarily only measuredifferences in temperature. The absolute temperature at the measuring point can be determinedfrom these if the associated temperature at the cold junction is known or is measured separately andcompensated for. The material combinations and associated thermoelectric voltage/temperature
characteristics of the most common types of thermocouple are standardized in the IEC 60584 and
ASTM E230/ANSI MC96.1 standards.

Measurement system

Endress+Hauser offers a complete portfolio of optimized components for the temperature measuring
point – everything you need for the seamless integration of the measuring point into the overall
facility.
These include:• Power supply unit/active barrier• Configuration units• Overvoltage protection
For more information, see the brochure 'System Components – Solutions for a Complete
Measuring Point' (FA00016K/09)

Endress+Hauser

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7

7

7
6

6
5

1
+
2
-

4

5

1
+
2
-

4

3

3

7

7
6

6
5

1
+
2
-

4
3

5

1
+
2
-

4
3

+
+
+
+
+
+
-

HAW56x3 OUT 4

HAW56x3 OUT 4

HAW56x

1
2
3
4
5
6

3 OUT 4

HAW56x3 OUT 4

1 IN 2

1 IN 2

1 IN 2

1 IN 2

A0033065

1

Application example in a reactor; mounted multipoint thermometer in a locally existing thermowell withfour measurement points and four transmitters or terminal blocks in remote junction box.

1
2
3
4

Device configuration with application software FieldCare
Commubox
PLC
Active barrier of the RN series (24 VDC, 30 mA) that has a galvanically isolated output for power supply toloop-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.
Surge arrester modules from the HAW product family for protection of signal lines and components inhazardous areas, e.g. 4 to 20 mA- , PROFIBUS® PA, FOUNDATION Fieldbus™ signal lines. More information
can be found in the associated Technical Information.
Remote junction box available as an option with built-in transmitter for 4 to 20 mA, PROFIBUS® PA,
FOUNDATION Fieldbus™ signal lines.
Mounted multipoint thermometer in a locally existing conduit.

567

Equipment architecture

The new iTHERM MultiSens Slim has an innovative design able to allow a wide variety of options interms of materials selection, nominal diameters and number of measuring points. In addition a
portfolio of selectable accessories (not in contact with the process) individually managed for easy
maintenance and spare part ordering, like adapters and conduits, is available.
It consists of five main sub-assemblies:• Extension: it consists of a threaded bushing for sealed electrical connections, matched to an
adapter from which flexible conduit containing the extension cables.
• Main bushing and reinforcing sleeve: to seal and protect electrical junctions and to adjust
immersion length.
• Process connection: represented by a compression fitting. When necessary, an ASME or EN
flange is available on request.
Other standards or connection types can be offered on request. The flanges are provided withwelded compression fitting for process tightness.
• Thermowell: with reinforcing sleeve.
• Insert: composed of metal sheathed sensing measuring elements (thermocouples), extension
cable and transition bushing. The sensing elements are mounted inside a thermowell with a small
pipe diameter.
Part of the thermowell can be a flexible hose to guarantee additional bendability and thus better
positioning of the probe in the process (above all in the case of misalignment between installation
nozzle and the distribution of measuring points).
• Additional accessories: Components that can be ordered independently from the selected productconfiguration, such as junction boxes and transmitters, able to fit with all the already installedcustomer devices.

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iTHERM TMS21 MultiSens Slim

In general, the system measures the temperature profile in the process environment using several
sensors. These are connected with a suitable process connection, which guarantees the tightness ofthe process. Externally, the extension cables (protected by the conduit) are wired into the junction
box, which can be installed integrated or remote (optional).
Some of the options listed in this document may not be available in your country. Please contact
your local Endress+Hauser representative.
Device type

Description
1: Extension

6

Flexible conduit to protect extension cables against environmental
pollutants and phenomena (such as abrasion, moisture, salt).
Material:• Polyamide• Metal (for Atex version)• Other materials on request
IP68 degree is guaranteed through the selected adapters.

1

2: Mainbushing

2a
2

3

7

2a:
Reinforcing
sleeve3: Processconnection

High-pressure compression fitting to guarantee tightness
between the process and the external environment. For many
media and different combinations of high temperatures andpressures.
In the case of a flange, the process connection is welded on theflange (standard). Other versions available on request.

4: ThermowellAnnealed tube used as protective sheath for sensing elements,
inserted into the process.

4a: Flexible
thermowellpart

Annealed tube provided of an upper flexible part (corrugatedconduit) to allow to reach different paths into the installation
environment.

5: Inserts

Not replaceable grounded or ungrounded thermocouple insertswith high accuracy measurement performance, long-term stability
and reliability.

6: Extension
cablesFor electrical connections between the inserts and junction box.

7: Groundterminal

For electric sensors grounding

4a
2a
3
2a

4

4
5

A0033069

Used to seal and protect electrical junctions and to adjust
immersion length.

• Shielded PVC• Shielded or unshielded FEP

A0030865

The modular multipoint thermometer is characterized by the following possible main
configurations:• Linear configuration• Flexible configuration

Input
Measured variable

Endress+Hauser

Temperature (temperature linear transmission behavior)

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iTHERM TMS21 MultiSens Slim

OutputOutput signal

Generally, the measured value can be transmitted in one of two ways:• Directly-wired sensors – sensor measured values forwarded without a transmitter.
• Via all common protocols by selecting an appropriate Endress+Hauser iTEMP temperaturetransmitter. All the transmitters listed below are mounted directly in the junction box and wiredwith the sensory mechanism.

Family of temperaturetransmitters

Thermometers fitted with iTEMP transmitters are an installation-ready complete solution to
improve temperature measurement by significantly increasing measurement accuracy and reliability,
when compared to direct wired sensors, as well as reducing both wiring and maintenance costs.
PC programmable head transmitters
They offer a high degree of flexibility, thereby supporting universal application with low inventory
storage. The iTEMP transmitters can be configured quickly and easily at a PC. Endress+Hauser offers
free configuration software which can be downloaded from the Endress+Hauser Website. Moreinformation can be found in the Technical Information.
HART programmable head transmitters
The transmitter is a 2-wire device with one or two measuring inputs and one analog output. The
device not only transfers converted signals from resistance thermometers and thermocouples, it alsotransfers resistance and voltage signals using HART communication. It can be installed as an
intrinsically safe apparatus in Zone 1 hazardous areas and is used for instrumentation in theterminal head (flat face) according to DIN EN 50446. Quick and easy operation, visualization andmaintenance using universal configuration software like FieldCare, DeviceCare or
FieldCommunicator 375/475. For more information, see the Technical Information.
PROFIBUS PA head transmitter
Universally programmable head transmitter with PROFIBUS PA communication. Conversion ofvarious input signals into digital output signals. High measurement accuracy over the complete
ambient temperature range. PROFIBUS PA functions and device-specific parameters are configured
via fieldbus communication. For more information, see the Technical Information.
FOUNDATION Fieldbus head transmitter
Universally programmable head transmitter with FOUNDATION Fieldbus communication.
Conversion of various input signals into digital output signals. High measurement accuracy over thecomplete ambient temperature range. All transmitters are approved for use in all the main processcontrol systems. The integration tests are performed in Endress+Hauser's 'System World'. For more
information, see the Technical Information.
Advantages of the iTEMP transmitters:• Double or single sensor input (optionally for certain transmitters)• Unsurpassed reliability, accuracy and long-term stability in critical processes• Mathematical functions• Monitoring of the thermometer drift, sensor backup functionality, sensor diagnostic functions• Sensor-transmitter-matching for dual-channel transmitters, based on Callendar/Van Dusencoefficients

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iTHERM TMS21 MultiSens SlimPower supply• Electrical connecting cables must be smooth, corrosion resistant, easy to be cleaned andinspected, robust against mechanical stresses, no-humidity sensitivity.
• Grounding or shielding connections are possible via ground terminals on the junction box.
Wiring diagrams

2 x TC

1 x TC
-

+

-

-

+

+

A0012700

2

Mounted terminal block

Wiring diagrams for TC connection
2

3

1
7
6

7
6

1

+

5
5

1
+
2
-

4

2

3

4
A0033075

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1
2
3
4

Wiring diagram of the double sensor input head transmitters (TMT8x)
Sensor input 1
Sensor input 2
Bus connection and supply voltage
Display connection

1
6

+
1+
5

+
-

4

-2-

3

3

2
A0045353

4
1
2
3

Endress+Hauser

Wiring diagram of the single input head transmitters (TMT7x)
Sensor input
Bus connection and supply voltage
Display connection and CDI interface

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iTHERM TMS21 MultiSens Slim

Performance characteristics
Permissible deviation limits of thermoelectric voltages from standard characteristic forthermocouples as per IEC 60584 and ASTM E230/ANSI MC96.1:

AccuracyStandard

ModelStandard tolerance

ASTM E230/
MC.96.1

Deviation; the larger value applies in each caseSpecial tolerance (on request)

K (NiCr-Ni)±2.2 K (±3.96 °F) or ±0.02 · |t| (–200 to 0 °C (–328 to 32 °F)±2.2 K (±3.96 °F) or ±0.0075 · |t|(0 to 1 260 °C (32 to 2 300 °F)±1.1 K (±1.98 °F) or ±0.004 · |t|(0 to 1 260 °C (32 to 2 300 °F)

J (Fe-CuNi)±2.2 K (±3.96 °F) or ±0.0075 · |t| (0 to 760 °C (32 to 1 400 °F)±1.1 K (±1.98 °F) or ±0.004 · |t|(0 to 760 °C (32 to 1 400 °F)

N (NiCrSiNiSi)±2.2 K (±3.96 °F) or ±0.02 · |t| (–200 to 0 °C (–328 to 32 °F)±2.2 K (±3.96 °F) or ±0.0075 · |t|(0 to 1 260 °C (32 to 2 300 °F)±1.1 K (±1.98 °F) or ±0.004 · |t|(0 to 1 260 °C (32 to 2 300 °F)

E (NiCr-CuNi)±1.7 K (±3.06 °F) or ±0.01 · |t| (–200 to 0 °C (–328 to 32 °F)±1.7 K (±3.06 °F) or ±0.005 · |t| (0 to 870 °C (32 to 1 598 °F)±1 K (±1.8 °F) or ±0.004 · |t|(0 to 870 °C (32 to 1 598 °F)

The materials for thermocouples are generally supplied such that they meet the tolerances fortemperatures > 0 °C (32 °F) as specified in the table. These materials are not usually suitable fortemperatures < 0 °C (32 °F). The specified tolerances cannot be observed. For this temperature range,a separate material selection is required. This cannot be processed using the standard product.
Standard

Model

IEC60584

Standard tolerance

Special tolerance (on request)

Class

Deviation

Class

Deviation

K (NiCr-Ni)

2±2.5 °C (±4.5 °F) (–40 to 333 °C (–40 to 631.4 °F)±0.0075 · |t| (333 to 1 200 °C (631.4 to 2 192 °F)

1±1.5 °C (±2.7 °F) (–40 to 375 °C (–40 to 707 °F))
±0.004 · |t| (375 to 1 000 °C (707 to 1 832 °F)

J (Fe-CuNi)

2±2.5 °C (±4.5 °F) (–40 to 333 °C (–40 to 631.4 °F)±0.0075 · |t| (333 to 750 °C (631.4 to 1 382 °F)

1±1.5 °C (±2.7 °F) (–40 to 375 °C (–40 to 707 °F))
±0.004 · |t| (375 to 750 °C (707 to 1 382 °F)

N (NiCrSiNiSi)

2±2.5 °C (±4.5 °F) (–40 to 333 °C (–40 to 631.4 °F)±0.0075 · |t| (333 to 1 200 °C (631.4 to 2 192 °F)

1±1.5 °C (±2.7 °F) (–40 to 375 °C (–40 to 707 °F))
±0.004 · |t| (375 to 1 000 °C (707 to 1 832 °F)

E (NiCr-CuNi)

2±2.5 °C (±4.5 °F) (–40 to 333 °C (–40 to 631.4 °F)±0.0075 · |t| (333 to 900 °C (631.4 to 1 652 °F)

1±1.5 °C (±2.7 °F) (–40 to 375 °C (–40 to 707 °F))
±0.004 · |t| (375 to 800 °C (707 to 1 472 °F)

Thermocouples made of non-precious metals are generally supplied such that they meet the
manufacturing tolerances for temperatures > –40 °C (–40 °F) as specified in the table. Thesematerials are not usually suitable for temperatures < –40 °C (–40 °F). The tolerances for Class 3
cannot be observed. For this temperature range, a separate material selection is required. Thiscannot be processed using the standard product.
Response time

Response time for the sensor assembly without transmitter.
Test architecture
Multimeter Keithley 2000
Fluid bath for response time tests
Test description
Tests in water at 0.4 m/s (1.3 ft/s), according to IEC 60751 and ASTM E644; 10 K temperature stepchange.
At the beginning the thermometer to be tested is stabilized in its raised position, outside the fluid atambient temperature, then it is immersed rapidly in the fluid bath. Measurement of the output
values of the thermometer begins at the latest at the moment in which the thermometer isimmersed in the bath. Recording continues until the thermometer has reached the temperature of
the medium.

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Tested thermowell diameter and length

Average response time at a temperature of
177 °C (350.6 °F)177 °C

6 mm (0.24 in), 4 520 mm (177.95 in)

t50

3s

t63

4.1 s

t90

9s

Additional tests (on request)• Functional test measurement at a fixed temperature over the entire thermowell: the multipoint
product under test is simultaneously checked by comparing its individual sensors with a multipointreference device having an already known behavior and accuracy. This test has not to be seen as acalibration test.
• Thermal excitation: this test allows the evaluation of the response time of each measuring point
when a local thermal excitation is applied. Additionally it shows the effects of the local excitationon the closest points due to the thermal equalization effect of the thermowell sheath.

Calibration

Calibration is a service that can be performed in house, either on single sensors before assembling oron the complete device before dispatching.
Calibration involves comparing the measured values of the measuring elements of the multipoint
inserts (DUT = device under test) with those of a more precise calibration standard using a definedand reproducible measurement method. The aim is to determine the deviation of the DUT measured
values from the true value of the measured variable.
Two different methods are used for the inserts:• Calibration at fixed points, e.g. at the freezing point of water at 0 °C (32 °F).
• Calibration compared against a precise reference thermometer.
Evaluation of inserts
If a calibration with an acceptable measurement uncertainty and transferable measurement
results is not possible, Endress+Hauser offers an insert evaluation measurement service, if
technically feasible.

Mounting procedure
Installation point

The installation location must meet the requirements listed in this document – such as ambient
temperature, ingress protection, climate class, etc. Care should be taken when checking the sizes ofpossible existing support frames or brackets welded on the reactor’s wall (usually not included in thescope of delivery) or of any other existing frame in the installation area.

Orientation

It is recommended to install the multipoint thermometer in vertical configuration. When verticalinstallation is not possible, care has to be taken in order to ensure that the reinforcing sleeve is notunder bending loads due to the any conduit cable tension.
When the flexible configuration is ordered, even offset routings, which do not correspond to thealignment of the longitudinal axis of the multipoint thermometer, are allowed thanks to the flexible
part of the thermowell.

Endress+Hauser

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2

1

A0033848

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1
2

Installation instructions

Main configuration possibilities
Vertical installation with rigid configuration
Installation with flexible configuration

The multipoint thermometer is designed to be installed by means of a compression fitting, whennecessary with a flange mounted on a vessel, reactor, tank or similar environment.
The thermometer has been developed to ensure utmost flexibility in terms of possible routing
through any encumbrance and constraint that can be met in any plant. It guarantees a high sealinglevel, noiseless signals, and high mechanical protection of the extension cables.
All parts and components have to be handled with care. During the installation phase, lifting andintroduction of the equipment through the preset nozzle, the following must be avoided:• Misalignment with the nozzle axis.
• Any load on the welded or threaded parts due to the action of the weight of the device.
• Overtightening of the compression fittings.
• Any tensile and torsional load on the conduit cable.
• Any bending load on the conduit cable.
• Fixing the extension conduit on the plant's infrastructures without allowing axial displacements ormovements.
• Deformation or crushing of the threaded components, bolts, nuts, cable glands and compression
fittings.
• Bending radius of the flexible part of the thermowell smaller than 20 times the diameter of theflexible hose.
• Tension loads on the flexible part.
• Friction between the flexible part and the internals of the reactor.
• Fixing the flexible part on the reactor's infrastructures without allowing axial displacements ormovements.

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Environment
Ambient temperature range

Configuration without junction box: –40 to +95 °C (–40 to +203 °F)
Configuration with junction box, ordered as accessory:

Storage temperature

Junction box

Non-hazardous area

Hazardous area

Without mounted
transmitter–40 to +85 °C (–40 to +185 °F) –40 to +60 °C (–40 to +140 °F)

With mounted headtransmitter–40 to +85 °C (–40 to +185 °F) Depends on the respective hazardous area
approval. Details see Ex documentation.

Configuration without junction box: –40 to +95 °C (–40 to +203 °F)
Configuration with junction box, ordered as accessory:
Junction box

Humidity

With head transmitter–40 to +95 °C (–40 to +203 °F)

With DIN rail transmitter–40 to +95 °C (–40 to +203 °F)

Condensation according to IEC 60068-2-14:• Head transmitter: Permitted• DIN rail transmitter: Not permitted
Maximum relative humidity: 95% according to IEC 60068-2-30

Degree of protection• Extension conduit: IP68
• Junction box: IP66/67

Electromagnetic
compatibility (EMC)

Depending on the transmitter used. For detailed information see the related Technical Information,
listed at the end of this document.

Process
The process temperature and pressure are the minimum input parameters for the selection of theright product configuration. If special product features are requested, additional data such as process
fluid type, phases, concentration, viscosity, stream and turbulences, corrosion rate have to beconsidered as mandatory for the whole product definition.
Process temperature range

Process pressure range

Tmax depending on thermocouple types
Diameter in mm (in)Type N

Type K

Type J

Type E

1.5 (0.06)

920 °C (1 688 °F)

920 °C (1 688 °F)

440 °C (824 °F)

510 °C (950 °F)

1 (0.04)

700 °C (1 292 °F)

700 °C (1 292 °F)

260 °C (500 °F)

300 °C (572 °F)

0.5 (0.02)

700 °C (1 292 °F)

700 °C (1 292 °F)

260 °C (500 °F)

300 °C (572 °F)

0.8 (0.03)

700 °C (1 292 °F)

700 °C (1 292 °F)

260 °C (500 °F)

300 °C (572 °F)

0 to 90 bar (0 to 1 305 psi)
In any case, the maximum required pressure must be combined with the maximum allowableprocess temperature. Process connections like compression fittings and flanges with their
specific ratings, selected according to the plant requirements, define the maximum process
conditions at which the device has to operate.
Endress+Hauser experts can support the customer on any related questions.

Endress+Hauser

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iTHERM TMS21 MultiSens Slim

Process applications• Syngas Treatment• Methanol and urea production• Ammonia process• Ethylene oxide/ethylene glycol production• Purified Terephthalic Acid (PTA) production• Polyethylene Terephthalate (PET) production• Vinyl Chloride Monomer (VCM) production• Methyl Methacrylat (MMA) production• Polyurethane (PUR) production• Tube bundle reactor• Pilot plants temperature measurement
Higher pressures can be achieved according to the specific process requirements by selecting thecorrect flange, compression fittings and materials that are permanently consistent to the processtemperature.

Mechanical construction
Design, dimensions

The overall multipoint assembly is composed of standardized parts with different features allowing awide range of product configurations. Different inserts, in terms of TC types, standards, materials,
lengths and thermowells are available. They can be selected based upon specific process conditions,in order to have the highest application match and the most extended lifetime. Associated extension
cables are provided with high resistance sheath materials and shielded for steady and noiselesssignals, protected by a polymeric conduit to withstand different environmental conditions (salt, sand,humidity, etc.). The transition between the probe and the conduit is obtained by the usage of a mainbushing, containing the electrical junctions between the TC sensors and the extension cables. It iscompletely sealed to ensure the declared degree of protection IP68.
It also works as the transition part between the reinforcing sleeve and the conduit cable for signal
communication. The reinforcing sleeve is the dedicated probe’s zone to adjust the immersion length
through sliding compression fittings or flanges. For the flexible configuration the reinforcing sleeve
has integrated the flexible thermowell that allows non-linear routings into the process. If there is amisalignment between the installation connection and the direction of the measurement given by
the rigid part of the thermowell, the flex configuration is the proper solution.

12

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iTHERM TMS21 MultiSens Slim

A

M

C

B

TD

FL

RD

LMP1

LMPn
L

A

C/2

H

C

B

M

OD

FD

RD

TD

FL

LMP1

LMPn

L
A0033087

6

Rigid and flexible design of the modular multipoint thermometer. All dimensions in mm (in)A
Conduit cable length
B
Main bushing length 190 mm (7.50 in)CReinforcing sleeve length, 200 mm (7.87 in)
FD Flexible part diameter
FL Flying leads lengthH
Flexible part length
LMPx Immersion length of sensing elements
L
Device length
M Thermowell length
RD Reinforcement diameter
TD Thermowell diameter
OD Outer diameter

Conduit cable length A and flying leads length FL
A: Maximum 5 000 mm (197 in), minimum 1 000 mm (39.4 in)
FL: 500 mm (19.7 in) as standard
Specifically customized lengths are available on request.

Reinforcing sleeve length C
200 mm (7.87 in)Specifically customized lengths are available on request.

Flexible part diameter FD
9.8 mm (0.39 in), 16.2 mm (0.64 in)Outer diameter OD
14 mm (0.55 in), 21 mm (0.83 in)

Flexible hose length H
Max. 4 000 mm (157 in)Specifically customized lengths are available on request.

Immersion lengths MPx of measuring elements
Max. 13 m (512 in)Specifically customized lengths are available on request.

Endress+Hauser

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iTHERM TMS21 MultiSens Slim

Maximum circuits total length
For Ex-version, rigid design
FL+L ≤ 50 m (164 ft)
Specifically customized lengths are available on request.

Compression fitting pressure rating at ambient temperature
NPT/ISO Size

bar

psi

1/4"

550

8000

1/2"

530

7700

3/4"

500

7300

1"

370

5300

Thermowell diameter
Different insert types are available. For any different requirement that is not described here,
please contact the Endress+Hauser sales department.
Thermowell
Diameter

Available for
Ex-version• 3.2 mm (0.13 in)• 6 mm (0.24 in)• 6.35 mm (0.25 in)• 8 mm (0.31 in)• 9.5 mm (0.37 in)

Rigid

FlexibleSensorEx ia

Sheathmaterial

Thermocoupl Standard
e type316, 316L
Inconel600
316Ti
321
347

1x type K
1x type J
1x type N
1x type E
2x type K
2x type J
2x type N
2x type E

Measuringpoint
execution

IEC 60584
ASTM E230

Grounded
Ungrounded

Main bushing

316 + 316L

Reinforced sleeve + thermowell316 + 316L, 347, 321,
Inconel600, 316Ti

Main bushing

316 + 316L

Reinforced sleeve

316 + 316L, 347, 321,
Inconel600, 316Ti

Thermowell316 + 316L, 347, 321,
Inconel600, 316Ti

Flexible part

Inconel600, 347 (specification on request)
321, 316 + 316L (standard)

For improved reliability, Endress+Hauser can offer duplicate measuring point sensors, in orderto achieve a sensor backup. This is achieved either through duplicate thermocouples or throughthe coupling of two independent sensors (same length). Improved monitoring can be achievedin combination with double channel transmitters TMT8x.
Maximum number of inserts for every combination of thermowell and insert diameter 1)
Thermowell OD in mm (in)3.2 (0.13)
Insert diameter in mm (in)14

6 (0.24)

6.35 (0.25)

8 (0.31)0.5 (0.02)

8

28

22

46

0.8 (0.03)

3

15

12

24

2)

9.5 (0.37)
59 2)
30

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iTHERM TMS21 MultiSens Slim

Thermowell OD in mm (in)1)2)

3.2 (0.13)

6 (0.24)

6.35 (0.25)

8 (0.31)

9.5 (0.37)

1 (0.04)

2

10

8

18

22

1.5 (0.06)

-

6

4

8

12

For Ex-version, the maximum number of sensors is limited to 20.
For this configuration the main bushing has to be specially engineered

Weight

The weight can vary depending on the configuration: extension and thermowell length, type anddimensions of process connection as well as the number of inserts.

Materials of insert sheath,thermowell, main bushing
and all wetted parts

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.

Endress+Hauser

Material
nameShort form

Recommended
max.
temperature forcontinuous use
in air

Properties

AISI
316/1.4401

X5CrNiMo 17-12-2

650 °C (1 202 °F)• Austenitic, stainless steel• High corrosion resistance in general• Particularly high corrosion resistance in chlorinebased and acidic, non-oxidizing atmospheres
through the addition of molybdenum (e.g.
phosphoric and sulfuric acids, acetic and tartaric
acids with a low concentration)

AISI 316L/
1.44041.4435

X2CrNiMo17-12-2
X2CrNiMo18-14-3

650 °C (1 202 °F)• Austenitic, stainless steel• High corrosion resistance in general• Particularly high corrosion resistance in chlorinebased 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

Alloy600/
2.4816NiCr15Fe

1 100 °C
(2 012 °F)• A nickel/chromium alloy with very good
resistance to aggressive, oxidizing and reducing
atmospheres, even at high temperatures• Resistance to corrosion caused by chlorine gases
and chlorinated media as well as many oxidizing
mineral and organic acids, sea water etc.
• Corrosion from ultrapure water• Not to be used in sulfur-containing atmospheres

AISI
304/1.4301

X5CrNi18-10

850 °C (1 562 °F)• Austenitic, stainless steel• Can be used well in water and wastewater withlow level of pollution• Only at relatively low temperatures resistant toorganic acids, saline solutions, sulphates, alkaline
solutions, etc.

AISI 304L/
1.4307

X2CrNi18-9

850 °C (1 562 °F)• Good welding properties• Impervious to intergranular corrosion• High ductility, excellent drawing, forming, andspinning properties

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iTHERM TMS21 MultiSens Slim

Process connection

Material
nameShort form

Recommended
max.
temperature forcontinuous use
in air

PropertiesAISI 316Ti/
1.4571X6CrNiMoTi17-12-2 700 °C (1 292 °F)• Addition of titanium means increased resistanceto intergranular corrosion even after welding• Broad range of uses in the chemical,
petrochemical and oil industries as well as in coalchemistry• Can only be polished to a limited extent, titanium
streaks can form

AISI
321/1.4541

X6CrNiTi18-10

815 °C (1 499 °F)• Austenitic, stainless steel• High resistance to intergranular corrosion evenafter welding• Good welding characteristics, suitable to allstandard welding methods• It is used in many sectors of the chemicalindustry, petrochemical, and pressurized vessels

AISI
347/1.4550

X6CrNiNb10-10

800 °C (1 472 °F)• Austenitic, stainless steel• Good resistance to a wide variety ofenvironments in the chemical, textile, oilrefining, dairy and food industries• Added niobium makes this steel impervious tointergranular corrosion• Good weldability• Main applications are furnace fire walls, pressure
vessels, welded structures, turbine blades

FlangeExamples of most common flanges according to the following standards: ASME, EN
Standard 1) Size

RatingMaterial 2)

ASME½", 1”, 1½”, 2”, 3”, 4”

150#, 300#AISI 316 + 316L, 316Ti, 321, 347

EN

DN15, DN25, DN32, DN40, DN50, DN80, PN10,PN16, PN40
DN100

1)
2)

Other flange standards are available on request. Please refer to our technicians for support.
Plated flanges with special alloys (i.e. Alloy 600) are available

Compression fittings
The compression fittings are used directly as the process connection or welded or threaded into theflange to ensure proper process tightness and performances. Dimensions are coherent with thereinforcing sleeve dimensions.

Operation
For details of operability, see the Technical Information of the Endress+Hauser temperaturetransmitters or the manuals of the related operating software.

Certificates and approvals
Current certificates and approvals for the product are available at www.endress.com on the relevant
product page:16

1.

Select the product using the filters and search field.

2.

Open the product page.

Endress+Hauser

iTHERM TMS21 MultiSens Slim

3.

Select Downloads.

Ordering information
Detailed ordering information is available from your nearest sales organizationwww.addresses.endress.com or in the Product Configurator at www.endress.com:
1.

Select the product using the filters and search field.

2.

Open the product page.

3.

Select Configuration.
Product Configurator - the tool for individual product configuration• Up-to-the-minute configuration data
• Depending on the device: Direct input of measuring point-specific information such asmeasuring range or operating language• Automatic verification of exclusion criteria• Automatic creation of the order code and its breakdown in PDF or Excel output format• Ability to order directly in the Endress+Hauser Online Shop

Endress+Hauser

17

iTHERM TMS21 MultiSens Slim

Accessories
The accessories currently available for the product can be selected at www.endress.com:

Device-specific accessories

1.

Select the product using the filters and search field.

2.

Open the product page.

3.

Select Spare parts & Accessories.

Accessories

Description

Junction box

The junction box is suited for chemical agents
environments. Sea water corrosion resistance andextreme temperature variation stability is guaranteed.
Ex-e, Ex-i terminals can be generally installed.

Transmitter

Head transmitter• PC programmable head transmitter• With HART®-, PROFIBUS® PA or FOUNDATION
FieldbusTM communication protocol
8-channel DIN rail transmitter with FOUNDATION
FieldbusTM communication protocol

Pads, clips, spacers• Pads and clips: in order to fix the multipoint
thermometer along its immersion length.
• Spacer: Used in presence of an existing thermowell inorder to guarantee the centering.

Specific extension for on-board junction box

When the junction box cannot be remotely installed, it
has to be configured on-board at the multipoint
thermometer. Therefore, a specific extension design has
to be provided. This design is available on request only
for flanged process connection.

C
A

B

A0030866

7Junction box as accessory for remote installation

Possible junction box dimensions (A x B x C) in mm (in):Stainless Steel

Aluminum

18

A

B

C

Min.

150 (5.9)

150 (5.9)

100 (3.9)

Max.

500 (19.7)

500 (19.7)

160 (6.3)

Min.

305 (12)280 (11)238 (9.4)

Max.

600 (23.6)

600 (23.6)

365 (14.4)

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iTHERM TMS21 MultiSens Slim

Communication-specificaccessories

Type of specification

Junction box

Cable glands

Material

AISI 316 / aluminum

NiCr Plated brass
AISI 316 / 316L

Ingress protection (IP)IP66/67

IP66

Ambient temperature range–50 to +60 °C(–58 to +140 °F)–52 to +110 °C (–61.1 to +140 °F)

Approvals

IECEx, ATEX, UL, CSA, NEPSI/ CCC, EAC Ex approval for use
in hazardous area approval

Identification

ATEX II 2GD Ex e IIC
T6/T5/T4 Gb/Ex ia IIC
T6/T5/T4 Ga Ex tb IIIC T85°C/
T100°C/T135°C Db IP66
UL913 Class I, Zone 1, AEx e
IIC; Zone 21, AEx tb IIIC IP66
CSA C22.2 No.157 Class I,
Zone 1 Ex e IIC; Class II,
Groups E, F and G
IECEx Ex e IIC T6/T5/T4
Gb/Ex ia IIC T6/T5/T4 Ga Ex
tb IIIC T85°C/T100°C/T135°C
Db IP66
EAC 1 Ex e IIC T6/T5/T4 Gb
X/1 Ex ia IIC T6/T5/T4 Gb X/
Ex tb IIIC T85°C/T100°C/
T135°C Db IP66

Cover

Hinged-Maximum sealing diameter-

6 to 12 mm (0.24 to 0.47 in)

Configuration kit TXU10

Configuration kit for PC-programmable transmitter with setup software andinterface cable for PC with USB port
Order code: TXU10-xx

Commubox FXA195
HART

For intrinsically safe HART communication with FieldCare via the USB port.

Commubox FXA291

 For details, see "Technical Information" TI00404F
Connects Endress+Hauser field devices with a CDI interface (= Endress+Hauser
Common Data Interface) and the USB port of a computer or laptop.

 For details, see "Technical Information" TI00405C
Field Xpert SMT70

The tablet PC for device configuration enables mobile plant asset management inhazardous and non-hazardous areas. It is suitable for commissioning andmaintenance.

 For details, see "Technical Information" TI01342S
Wireless HART adapter
SWA70

Is used for the wireless connection of field devices.
The WirelessHART adapter can be easily integrated into field devices and existing
infrastructures, offers data protection and transmission safety and can be operated
in parallel with other wireless networks with minimum cabling complexity.

 For details, see Operating Instructions BA061S

Endress+Hauser

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iTHERM TMS21 MultiSens Slim

Service-specific accessories

Accessories

Description

Applicator

Software for selecting and sizing Endress+Hauser measuring devices:• Calculation of all the necessary data for identifying the optimum measuring
device: e.g. pressure loss, accuracy or process connections.
• Graphic illustration of the calculation results
Administration, documentation and access to all project-related data andparameters over the entire life cycle of a project.
Applicator is available:
Via the Internet: https://portal.endress.com/webapp/applicator

FieldCare SFE500

FDT-based plant asset management tool from Endress+Hauser.
It can configure all smart field units in your system and helps you manage them. By
using the status information, it is also a simple but effective way of checking theirstatus and condition.

 For details, see Operating Instructions BA00027S and BA00065S
DeviceCare SFE100

Configuration tool for devices via fieldbus protocols and Endress+Hauser service
protocols.
DeviceCare is the tool developed by Endress+Hauser for the configuration ofEndress+Hauser devices. All smart devices in a plant can be configured via a pointto-point or point-to-bus connection. The user-friendly menus enable transparent
and intuitive access to the field devices.

 For details, see Operating Instructions BA00027S
Documentation
For an overview of the scope of the associated Technical Documentation, refer to the following:• Device Viewer (www.endress.com/deviceviewer): Enter the serial number from thenameplate• Endress+Hauser Operations app: Enter serial number from nameplate or scan matrix code on
nameplate.
Document function

20

The following documentation may be available depending on the version ordered:
Document type

Purpose and content of the document

Technical Information (TI)

Planning aid for your device
The document contains all the technical data on the device and provides
an overview of the accessories and other products that can be ordered forthe device.

Brief Operating Instructions (KA)

Guide that takes you quickly to the 1st measured value
The Brief Operating Instructions contain all the essential informationfrom incoming acceptance to initial commissioning.

Operating Instructions (BA)Your reference document
The Operating Instructions contain all the information that is required in
the various phases of the life cycle of the device: from productidentification, incoming acceptance and storage, to mounting,connection, operation and commissioning through to troubleshooting,
maintenance and disposal.

Description of Device Parameters(GP)

Reference for your parameters
The document provides a detailed explanation of each individual
parameter. The description is aimed at those who work with the device
over the entire life cycle and perform specific configurations.

Endress+Hauser

iTHERM TMS21 MultiSens Slim

Document type

Purpose and content of the document

Safety Instructions (XA)

Depending on the approval, safety instructions for electrical equipment inhazardous areas are also supplied with the device. The Safety Instructions
are an integral part of the Operating Instructions.
Information on the Safety Instructions (XA) relevant to the device is provided
on the nameplate.

Supplementary device-dependent
documentation (SD/FY)

Endress+Hauser

Always comply strictly with the instructions in the relevant
supplementary documentation. The supplementary documentation is an
integral part of the device documentation.

21

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71637644

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