XA02759T/09/EN/01.21-00
71553433
2021-12-27

ProductsSolutions

Safety Instructions
TMS21
RTD/TC thermometers
ATEX: II 1/2D Ex ia IIIC or
II 1/2G Ex ia IIC
IECEx: Ex ia IIC

Services

TMS21

XA02759T

TMS21
RTD/TC thermometers
Table of contents
Supplementary Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Manufacturer address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Instructions: Installation of intrinsic safety . . . . . . . . . . . . . . . . . . . 6Safety instructions: Installation of Dust ignition protection . . . . . . . . . . . 6
Safety instructions: Specific conditions of use . . . . . . . . . . . . . . . . . . . . . . . 6
Temperature tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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Supplementary
Documentation

Explosion-protection brochure: CP00021Z/11

Certificates

ATEX certificate

The Explosion-protection brochure is available: In the download area of
the Endress+Hauser website: www.endress.com → Download →Advanced → Documentation code: CP00021Z

Certificate number: CESI 20 ATEX 033 X
Affixing the certificate number certifies conformity with the following
standards (depending on the device version).
• EN IEC 60079-0 : 2018
• EN 60079-11 : 2012
• EN 60079-26 : 2015
IECEx certificate
Certificate number: IECEx CES 21.0002X
Affixing the certificate number certifies conformity with the following
standards (depending on the device version).
• IEC 60079-0 : 2017
• IEC 60079-11 : 2011
• IEC 60079-26 : 2014

Manufacturer
addressEndress+Hauser Wetzer GmbH + Co KG
Obere Wank 1
D-87484 Nesselwang
Germany
Phone: +49 (0)8361 308 0

Safetyinstructions

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Non-hazardous area

Non-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

TaHazardous area
Zone 1, 2 or Zone 21, 22
EPL Gb, Gc or EPL Db, DcTabushingSee illustration
below

Partition wall,
Process connection
See illustration
below

Tp

Tp

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

Local potential equalization

A0047521

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

Zone 1, 2
Zone 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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TMS21

SafetyInstructions:
Installation ofintrinsic safety• Comply with the installation and safety instructions in the OperatingInstructions.
• Install the sensor according to the manufacturer's instructions andany other valid standards and regulations (e.g. IEC 60079-14, IEC60079-25).
• Observe the safety instructions for the used transmitters.
• The TMS21’s sensors are not isolated to the metallic sheath inconformance with IEC/EN 60079-11 chapter 6.3.13, therefore theTMS21’s sensors shall be supplied by an intrinsically safe circuit witha galvanic isolation.
• If the equipment is mounted across the boundary between an area
requiring EPL Ga and a less hazardous area, install TMS21 in amanner that the process connection will fulfill requirements of clause
4.3 of IEC/EN 60079-26.

Safetyinstructions:
Installation of
Dust ignition
protection• These instructions concern the required enclosure, accessories andsupply cables in final application.
• Comply with the installation and safety instructions in the Operating
Instructions.
• Install the temperature assembly according to the manufacturer's
instructions and any other valid standards and regulations (e.g.
IEC/EN 60079-14).
• For ambient temperatures higher than +70°C, use suitable heatresisting cables or wires, cable entries and sealing facilities for Ta+5K above surrounding.

LWARNING
Explosive atmosphere‣ In an explosive atmosphere, when voltage is supplied, do not open
the device or any enclosure connected to it in order to avoid
impacting the IP grade (required for the installation)
Safetyinstructions:
Specific
conditions of use6

• The TMS21 and final enclosure shall be connected to the same local
potential equalization.
• When install the TMS21 in conjunction with a junction box, theenclosure and its accessories (e.g. cable gland with barrier) shall becertified providing a degree of protection of at least IP54 according to
IEC/EN 60079-0.
• The mechanical construction of sensors’ thermowell andreinforcement tube complies with a partition wall in accordance with
IEC/EN 60079-26 clause 4.1.3.2. For those constructive variants
where the material thickness is less than 1mm, the user shall ensurethat the material shall not be subject to environmental conditions
which may adversely affect the partition wall.
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XA02759T

Supply circuit: in type of protection intrinsic safety Ex ia IIC, for connection to a certified
intrinsically safe circuit for each sensor circuit with following maximumvalues:
UiIi

PiCi

Li

9V

26 mA

50 mW

10 nF

50 μH

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Temperaturetables
Category

Type of protection (ATEX)

Type

II1/2G
II1/2D

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

TMS21

Type of protection (IEC)Type

Ex ia IIC T6… T1 Ga/Gb
Ex ia IIIC T85°C… T450°C Da/DbTMS21

The dependency of the ambient and process temperature upon the temperature class/maximumsurface temperature for each sensing element:
Sensor Type

Temperatureclass/
Maximum
surfacetemperature

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

Ta (ambienttemperature)- Maximum
allowedambienttemperature
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 at
cable/bushing does not exceed the maximum allowed surface
temperature.

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Partition wall
Processconnection

Surface Temp. -50°C...105°C

Surface Temp. -50°C...450°C

Ambient Temp. -50°C...100°C

Process temperature
residual influence

Process Temp. -50°C...440°C

Tp
Typical surfeace
temperature distribution
on TMS21

TaA0047524

Endress+Hauser

9*71553433*71553433

www.addresses.endress.com