iom tc tr

7/27/2019 IOM TC TR

1/11

Pressure andTemperature Measurement

Date: 5th November 2004

WIKA Alexander Wiegand

GmbH & Co. KG

Alexander -Wiegand-Str ae63911 Klingenb erg Germany

Tel +49 93 72 132-0

Fax +49 93 72 132-406/414

[email protected]

KommanditgesellschaftSitz Klingenberg

Amtsgerich t AschaffenburgHRA 1819

Komplementrin: WIKA AlexanderWiegand Verwaltungs GmbHSitz Klingenberg

Amtsgericht AschaffenburgHRB 306Geschftsfhrer: AlexanderWiegand

Page 1 of 11

Operating instructionsfor resistance thermometers and thermocouples

Content:

1. Safety instructions

2. Installation

3. Special measures for electrical connection

4. Storage

5. Maintenance / Repairs

6. Electrical conections

7. Explosion protection

7.1 Explosion protection, EN 50 020 EEx-i

7.2 Explosion protection, ATEX, EEx-i7.3 Explosion protection, ATEX, EEx-d

1. Safety instructionsIt is strictly necessary to observe the corresponding national safety regulations (ex: VDE 0100) wheninstalling, starting and operating these instruments.Please ensure the right selection of instruments/ thermowell with regard to the maximum pressure (ie.Table of contact ratings in DIN 43 772).Serious injuries and/or damages may occur should the appropriate regulations not be observed. Onlyqualified persons are authorized to work with these instruments.The instructions regarding the installation and operation in potentially explosive areas according tosection 7 are to be observed.

2. InstallationWith regard to the convection and heat radiation one must neither remain under nor exceed thepermissible working temperature (ambient, process medium) when mounting the thermometers.Thermometers may only be removed if the relevant part of the plant is free of pressure!The electrical connection must be terminated according to the instrument data sheets which show theappropiate sensor connections / terminals.

3. Special measures for electrical connectionDamaged cables, wires and connection points must be avoided.Fine-stranded conductor ends must be covered with end splices.The inner active capacitance and inductance must be observed.

4. StorageMeasuring instruments are to be protected from humidity and dust.

5. Maintenance / Repairs:The instruments require no maintenance or servicing.The manufacturer exclusively is authorized to do any repairs.Traces of process medium on removed thermometers may endanger human beings, the environmentand facilities. Sufficient precautionary measures must take action.

7/27/2019 IOM TC TR

2/11




GmbH & Co. KG


Tel +49 93 72 132-0

Fax +49 93 72 132-406/414

[email protected]





Page 2 of 11

6. Electrical connections

Electrical connections of RTDs with terminal block

7/27/2019 IOM TC TR

3/11




GmbH & Co. KG


Tel +49 93 72 132-0

Fax +49 93 72 132-406/414

[email protected]





Page 3 of 11

Electrical connection of thermocouples with terminal block

7/27/2019 IOM TC TR

4/11




GmbH & Co. KG


Tel +49 93 72 132-0

Fax +49 93 72 132-406/414

[email protected]





Page 4 of 11

Electrical connection of RTDs with cable or connector

7/27/2019 IOM TC TR

5/11




GmbH & Co. KG


Tel +49 93 72 132-0

Fax +49 93 72 132-406/414

[email protected]





Page 5 of 11

Electrical connection of thermocouples with cable or connector

7/27/2019 IOM TC TR

6/11




GmbH & Co. KG


Tel +49 93 72 132-0

Fax +49 93 72 132-406/414

[email protected]





Page 6 of 11

7. Explosion protection:

The regulations according to directive 94/9/EG (ATEX) must be valid.In addition the instructions of the respective countries regarding the use of explosive goods must bevalid (ex: EN 60079-10 and EN 60079-14).

A) The operator of a plant is responsable for the zone-classification not the manufacturer or supplier ofthe equipment.

B) Damaged thermometers must not be used.The procedure of repairs of electric equipment has been stipulated according to 9 ElexV.According to ElexV repairs must be executed by authorized persons only.Repairs must be done with original spare parts of the origin manufacturer. Else the requirements ofthe approval are not fulfilled.

C) If a part of an electrical equipment which is necessary for the explosion protection has beenrepaired, the electrical equipment must not operate again after a qualified person has stateded thecorrespondance of the important features according to the requirements of explosion protection.Furthermore the official expert must write up a certificate therefor and mark the equipment with acontrol mark.

D) Item C) is not valid if the equipment was repaired by the manufacturer and has passed themanufacturers routine test.

E) When using a transmitter please observe the following:- The contents of this instruction as well as the instructions of the transmitter.- The appropriate regulations of the construction and operation of electric installations.

- The regulations and directives of the explosive protection.- Transmitters must have their own approval.

F) Detailed information regarding the origin delivery are necessary in case of replacement orders:- Explosion protection method (eg. EEx-d, EEx-i)- Test certificate number- Order number- Serial number- Order item

G) Explosion protected thermometer only fulfill the safety requirements as a modular unit, as stipulated inthe certificate.Stand alone measuring inserts or connection heads do not fulfill the requirements for explosion

protection.The interconnection of any intrinsic safe components does not guarantee a intrinsic safe circuit.

H) If WIKA delivers thermometers without thermowell for use in hazardous zones, the operator of a plantis responsible for the use of the thermometer only in Ex-zones respective to the certificate of thethermometer.

I) Mounting in zone 20 / 21 / 22 (dust):The requirements of DIN EN 50 281-1-2 and DIN EN 60 529 must be observed.The electric circuit must be of type Ex ia.The surface temperature of the equipment must not exceed the ignition temperature of dispersed dustor dust lying on the surface of the equipment.

7/27/2019 IOM TC TR

7/11




GmbH & Co. KG


Tel +49 93 72 132-0

Fax +49 93 72 132-406/414

[email protected]





Page 7 of 11

Without dust deposit:The surface temperature must not exceed 2/3 of the ignition temperature of the respective dust/air mixture (DIN VDE 0165 chapter 3.2).

With dust deposit:On surfaces where an effective prevention of a deposit of possibly smouldering dust it is notpossible, the surface temperature must not exceed a temperature which is 75 K lower than theignition temperature of the respective dust. If the deposit thickness is greater than 5 mm anotherreduction of the temperature is necessary.

J) The operator of a plant must ensure that the relevant thermometer can be identified in all safety-relevant characteristics.

K) Conductive shieldings must be connected at one side only. This must take place outside of the Ex-area.A galvanic isolation between intrinsic-save and not-intrinsic-save circuit is necessary.The housing must be grounded against electromagnetic fields and electrostatic loads.

Metalic vessels:It is essential to connect the shielding with the grounding of the vessel.

Nonmetalic vessels:All conductive thermometer parts reaching into hazardous areas must have an potentialequalization.

L) Using thermometer with open cable endings (eg. TR/TC101, TR/TC730) the operator of a plant mustensure that the installation is conducted appropiate, respecting all relevant regulations.Qualified connectors must be used if the cables of the thermometer end inside a hazardous area.Open cable endings have to be connected outside of the hazardous area. Connecting the cables in anexplosive dust environment must be realised inside of housings according to directive 94/9/EC and EN50 281-1-1 with a ingress protetion grade of IP 65 min. The min. air- and creepage-distance is 2 mm.

7.1 Explosion protection according to EN 50 020 EEx-i

A) Operating in zone 2 (category 3):Equipment for use in hazardous areas of zone 2 do not need a special labeling (EN 50 020 paragraph5.4)

B) Measuring point grounded:If a thermometer does not withstand the isolation-voltage (500 VDC) as required in EN 50 020, theintrinsic safe circuit is deemed to be grounded (DIN EN 60 079-14 paragraph 12.2.4)This also applies to thermocouples with measuring points welded with the bottom.(See also NAMUR NE24)

7/27/2019 IOM TC TR

8/11




GmbH & Co. KG


Tel +49 93 72 132-0

Fax +49 93 72 132-406/414

[email protected]





Page 8 of 11

7.2 Explosion protection according to ATEX EEx-i

EC-Type test certificate TV 02 ATEX 1793 X

A) Classification:Classification max. temperature in C

at thermowell / measuring insertat power Pmax at sensor*

1

minimal necklength

M h *2

ambienttemperature

range Ta *3

currency with ia 50 mW 100 mW 250 mW 500 mW

II 1 GD EEx ia IIC T80 C IP65and / or II 1 G EEx ia IIC T6

62 59 52 43 --20C...55 C

II 1 GD EEx ia IIC T95 C C IP65

and / or II 1 G EEx ia IIC T5

74 71 64 55 - -20C...70 C

II 1 GD EEx ia IIC T130 C IP65


102 99 92 83 20 mm -20C...100 C

II 1 GD EEx ia IIC T195 C IP65and / or II 1 G EEx ia IIC T3

154 151 144 135 50 mm -20C...100 C



230 227 220 211 100 mm -20C...100 C



350 347 340 331 100 mm -20C...100 C

currency with ib 50 mW 100 mW -

II 1/2 GD EEx ib IIC T80 C IP65

and / or II 1/2 G EEx ib IIC T6

52 43 --20C...55 C



64 55 - -20C...70 C



92 83 20 mm -20C...100 C



144 135 50 mm -20C...100 C



220 211 100 mm -20C...100 C



340 331 100 mm -20C...100 C

currency with ib 50 mW 100 mW 250 mW 500 mW

II 2 GD EEx ib IIC T80 C IP65

and / or II 2 G EEx ib IIC T6

78 75 68 59 --20C...55 C



93 90 83 74 - -20C...70 C



128 125 118 109 20 mm -20C...100 C



193 190 183 174 50 mm -20C...100 C



288 285 278 269 100 mm -20C...100 C



438 435 428 419 100 mm -20C...100 C

7/27/2019 IOM TC TR

9/11




GmbH & Co. KG


Tel +49 93 72 132-0

Fax +49 93 72 132-406/414

[email protected]





Page 9 of 11

*1 If multiple RTD sensors are used (or several single RTD sensors) and operating at the same

time, the summary of the single power rates must not exeed the value of the max. permissiblepower acc. to the classification table.

*2 The minimal neck length is defined as the distance between the lower edge of the connectionhead to the heat emitting surface.

*3 When using a transmitter or a loop powered display, the permissible ambient-temperature has tobe taken from the corresponding approval. The respective lowest temperature value of the usedequipment must be used.

B) The thermometer is not marked with the max. permissible medium temperature. For theinterrelationship of temperature class, the permissible ambient temperature, the minimal necklenth and the maximal temperature at the thermowell / measuring insert see classification table.

C) Mounting in zone 0 / 20 (category 1):The electrical circuit must be of type EEx ia.The process connections must have a certain effectual tightness, according to EN 50 284paragraph 4.5.The requirements of EN 50 284 must be observed.The process pressure and the temperature of the medium must range between 0.8 bar to 1.1 barand -20 C to +60 C. If the thermometer operates outside of the range of this atmosphericconditions, the approval of the category 1 apparatus has to regard as guideline. Additional testsfor the special application conditions are recommended.

D) Mounting at zone 0 / 20 (category 1/2):The electrical circuit must be of type EEx ib.

The process connections must have a certain effectual tightness, according to EN 50 284paragraph 4.5.The requirements of EN 50 284 must be observed.

7/27/2019 IOM TC TR

10/11




GmbH & Co. KG


Tel +49 93 72 132-0

Fax +49 93 72 132-406/414

[email protected]





Page 10 of 11

7.3 Explosion protection according to ATEX EEx-d

EC-Type test certificate TV 02 ATEX 1858 X

A) Classification:classification max. temperature in C

at thermowell / measuring insertat power Pmax at sensor: *1

minimalnecklength

M h *2

ambienttemperature

range Ta *32-fault-safety

(e.g. currency with ia)50 mW 100 mW 250 mW 500 mW

II 1/2 GD EEx d IIC T80 C IP65

and / or II 1/2 G EEx d IIC T6

63 61 56 46 --20C...55 C

II 1/2 GD EEx d IIC T95 C C IP65


75 73 68 58 - -20C...70 C



103 101 96 86 20 mm -20C...100 C

II 1/2 GD EEx d IIC T195 C IP65and / or II 1/2 G EEx d IIC T3

155 153 148 138 50 mm -20C...100 C



231 229 224 214 100 mm -20C...100 C



351 349 344 334 100 mm -20C...100 C

1-fault-safety with limited currency

(e.g. currency with ib)50 mW 100 mW



56 46 --20C...55 C



68 58 - -20C...70 C



96 86 20 mm -20C...100 C



148 138 50 mm -20C...100 C



224 214 100 mm -20C...100 C



344 334 100 mm -20C...100 C

1-fault-safety

(e.g. currency with ib)50 mW 100 mW 250 mW 500 mW

II 2 GD EEx d IIC T80 C IP65

and / or II 2 G EEx d IIC T6

78 75 68 59 --20C...55 C



93 90 83 74 - -20C...70 C



128 125 118 109 20 mm -20C...100 C



193 190 183 174 50 mm -20C...100 C



288 285 278 269 100 mm -20C...100 C



438 435 428 419 100 mm -20C...100 C

7/27/2019 IOM TC TR

11/11




GmbH & Co. KG


Tel +49 93 72 132-0

Fax +49 93 72 132-406/414

[email protected]





Page 11 of 11

*1 If multiple RTD sensors are used (or several single RTD sensors) and operating at the sametime, the summary of the single power rates must not exeed the value of the max. permissiblepower acc. to the classification table.

*2 The minimal neck length is defined as the distance between the lower edge of the connectionhead to the heat emitting surface.

*3 When using a transmitter or a loop powered display, the permissible ambient-temperature has tobe taken from the corresponding approval. The respective lowest temperature value of the usedequipment must be used.

B) The thermometer is not marked with the max. permissible medium temperature. For theinterrelationship of temperature class, the permissible ambient temperature, the minimal necklenth and the maximal temperature at the thermowell / measuring insert see classification table.

C) Mounting at zone 0 / 20 (category 1/2):

The electrical circuit must be of type EEx ia or EEx ib.A separation device is necessary for operation.The process connections must have a certain effectual tightness, according to EN 50 284paragraph 4.5.The requirements of EN 50 284 must be observed.

iom tc tr

Documents