XA02904T/09/EN/01.22-00
71580786
2022-07-25

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Safety Instructions
iTHERM MultiSens Slim TMS21
TC thermometers
Ex ia IIC T1...T6 Ga/Gb
Ex ia IIIC T85 °C...T450 °C Db
Safety instructions for electrical apparatus in
explosion-hazardous areas

iTHERM MultiSens Slim TMS21

XA02904T

iTHERM MultiSens Slim TMS21
TC thermometers
Table of contents
About this document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Associated documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Supplementary documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Manufacturer's certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Manufacturer address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Special conditions for Safe use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Condition for Safe use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Manufacturer’s Responsibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Marking of equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Temperature tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical connection data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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XA02904T

About thisdocument

iTHERM MultiSens Slim TMS21

This document has been translated into several languages. Legallydetermined is solely the English source text.
The document translated into EU languages is available:• In the download area of the Endress+Hauser website:www.endress.com -> Downloads -> Manuals and Datasheets ->Type: Ex Safety Instruction (XA) -> Text Search: …
• In the Device Viewer: www.endress.com -> Product tools ->Access device specific information -> Check device features
If not yet available, the document can be ordered.

Associateddocumentation

This document is an integral part of the following OperatingInstructions:• Operating instructions: BA01705T• Technical information: TI01298T

Supplementary
documentation

Explosion-protection brochure: CP00021Z/11

Manufacturer'scertificates

NEPSI Certificate of Conformity

The Explosion-protection brochure is available:• In the download area of the Endress+Hauser website:www.endress.com -> Downloads -> Brochures and Catalogs ->Text Search: CP00021Z• On the CD for devices with CD-based documentation

Certificate number: GYJ22.1798X
Affixing the certificate number certifies conformity with the following
standards (depending on the device version).
• GB/T 3836.1 : 2021
• GB/T 3836.4 : 2021
• GB 3836.20 : 2010

Manufacturer
address

4Endress+Hauser Wetzer GmbH + Co. KG
Obere Wank 187484 Nesselwang, Germany

Endress+Hauser

iTHERM MultiSens Slim TMS21

XA02904TSafety
instructions
Non-hazardous area

Hazardous area

Power supply

Associated intrinsically safe
power supply units with max.
electrical specifications foreach circuit from table below

certified junction box,e.g. type SB-383816
Intrinsically safe
transmittersor terminals
TMS21

Ta
Hazardous area
Zone 1, 2 or Zone 21, 22
EPL Gb, Gc or EPL Db, Dc

Tabushing
See illustration
below

Partition wall,
Process connection
See illustration
below

Tp

Tp

Process
Zone 0, 1, 2 orZone 20, 21, 22
EPL Ga, Gb, Gcor EPL Da, Db, Dc

Local potential equalization

A0047521

Partition wall
Zone 1, 2
Zone 21, 22
EPL Gb, Gc
EPL Db, Dc

Zone 1, 2Zone 21, 22
EPL Gb, Gc
EPL Db, Dc

Zone 0, 1, 2
Zone 20, 21, 22
EPL Ga, Gb, Gc
EPL Da, Db, Dc

Zone 0, 1, 2
Zone 20, 21, 22
EPL Ga, Gb, Gc
EPL Da, Db, Dc

A0047522

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XA02904T

iTHERM MultiSens Slim TMS21

Special conditionsfor Safe use

The suffix "X" placed after the certificate number indicates that thisproduct is subject to special conditions for safe use, that is:• If the equipment is mounted between an area requiring EPL Ga andan area with EPL Gb, the TMS21 shall be installed in a way thatprocess connection meets the requirements of GB 3836.20-2010.
• For construction variants where the thickness of this wall is less than
1 mm, the user shall ensure that the equipment is not subject toenvironmental conditions that may adversely affect the partitionwall.
• For ambient temperatures above +70 °C, shall be used accessories
with an operational temperature at least +5 K higher than thesurrounding environment.

Condition for Safeuse• The connection of TMS21 with a junction box shall not invalidate thetype of protection of the latter and the junction box and its
accessories shall be certified according to GB/T 3836 relevant
standard series. The equipment and the final junction box shall beconnected equipotentially to each other.
• The sensors of the equipment are not isolated from the enclosure,therefore, the circuits shall be powered by intrinsically safe
equipment galvanically isolated.
• The user shall not change the configuration in order to maintain/
ensure the explosion protection performance of this product. Anychange may impair safety.
• For installation, use and maintenance of this product, the end user
shall observe the instruction manual and the following standards• GB 3836.13-2021 "Explosive atmospheres- Part 13:Equipment
repair, overhaul and reclamation".
• GB/T 3836.15-2017 "Explosive atmospheres- Part 15:Electricalinstallations design, selection and erection".
• GB/T 3836.16-2017 "Explosive atmospheres- Part 16:Electricalinstallations inspection and maintenance".
• GB/T 3836.18-2017 “Explosive atmospheres- Part 18:Intrinsicallysafe electrical systems”.
• GB50257-2014 “Code for construction and acceptance of electric
equipment on fire and device for explosion hazard electricalinstallation engineering”.
• GB 15577-2007 "Safety regulations for dust explosion preventionand protection".

Manufacturer’s
Responsibility• Conditions for safe use and special conditions for safe use, as
specified above, should be included in the documentation the user isprovided with.
• Manufacturing should be done according to the documentation
approved by NEPSI.

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iTHERM MultiSens Slim TMS21XA02904T

Marking ofequipment
Type of protectionType

Ex ia IIC T6…T1 Ga/Gb
Ex ia IIIC T85 °C…T450 °C Da/Db

TMS21Temperaturetables
The relationship between process temperature, ambient temperature, temperature class andmaximum surface temperature is shown as follows:
Sensor Type

Temperature class/Maximum surface
temperature

Tp (process) - Maximum
allowed process temperature(sensor)

Ta (ambient temperature) Maximum allowed ambienttemperature cable/bushing

K, J, N, E

T1/T450 °C–50 to +440 °C–50 to +100 °C

T2/T300 °C–50 to +290 °C–50 to +100 °C

T3/T200 °C–50 to +195 °C–50 to +100 °C

T4/T135 °C–50 to +130 °C–50 to +100 °C

T5/T100 °C–50 to +95 °C–50 to +95 °C

T6/T85 °C–50 to +80 °C–50 to +80 °C

LWARNING
Ambient temperature‣ It shall be verified, taking into account the worst case process andambient temperatures of the application, that the temperature atcable/bushing does not exceed the maximum allowed surface
temperature.

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XA02904T

iTHERM MultiSens Slim TMS21Partition wallProcessconnection

Surface Temp. -50°C...105°C

Surface Temp. -50°C...450°C

Ambient Temp. -50°C...100°C

Process Temp. -50°C...440°C

Process temperature
residual influence

Tp
Typical surfeace
temperature distribution
on TMS21TaA0047524

Electricalconnection data
For TMS21 the type of protection Ex ia IIC and Ex ia IIIC shall be connected from 2 up to 20
certified intrinsically safe circuits. Electrical parameters of each input circuit are the followings:
UiIi

Pi

Ci

Li

9V

26 mA

0.05 W

10 nF

0.5 µH

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