JUMO exTHERM-AT Explosion-Protected Surface-Mounted Thermostat Instruction Manual

JUMO exTHERM-AT Explosion-Protected Surface-Mounted Thermostat

Introduction

Application

• JUMO exTHERM-AT explosion-protected surface-mounted thermostats monitor or control temperatures in explosion-protected areas.
  • Zone 1 or 2: Gases, vapors and mist
  • Zone 21 or 22: Combustible dusts and dust/air mixtures.
• When used in potentially explosive areas, the requirements applicable to mounting and operating devices in these areas must be followed.
• Hybrid mixtures: If a hazardous atmosphere can occur at the place of installation that is potentially explosive because of gases, vapors or mist, and at the same time, one that is potentially explosive because of combustible dust, the safety characteristics of the gases, vapors, mist and combustible dusts may change. In such cases, it is advisable to have the suitability of the intended device checked by a relevant specialist agency.

Marking

• Designed in according to EN 14597 as a:
  • TW Temperature monitor
  • STW Safety temperature monitor
  • STB Safety temperature limiter
• Type examination according to EN 60079 series of standards
• JUMO exTHERM-AT surface-mounted thermostats comply with EN 60730 (VDE 0631).
• ATEX mark:
  • II 2G Ex db eb IIC T4/T5/T6 Gb
  • II 2D Ex tb IIIC T85°C/T100°C/T130°C Db
• IECEx mark (optional):
  • Ex db eb IIC T4/T5/T6 Gb
  • Ex tb IIIC T85°C/T100°C/T130°C Db
• Test certificate ATEX: EPS 11 ATEX 1 354
• Test certificate IECEx (optional): IECEx EPS 13.0046
• Test certificate EAC-Ex (optional): RU C-DE.HB07.B.00057/20
• Test certificate UA TR: СЦ 21.0635
• Test certificate SIL (optional): EPS 11 ATEX 1 354 (SIL 2)

Safety notes

• It is not admissible to open the internal thermostat case. Explosion protection will be lost.
• It is not admissible to open the lid in zones 21 and 22.
• The yellow dust protection inserts in the cable glands must be replaced with suitable inserts or cables during operation.
• Cutting through or kinking the capillary will lead to permanent device failure.
• When routing the capillary ensure a bending radius of  5 mm.
• Liquid may escape in the event of a measuring system fracture.

Physical and toxicological properties of the expansion medium that may escape in the event of a measuring system fracture:

Device identification

• Typ
• Control range or limit val
• Part no.
• Fabrication number
• Admissible ambient temperature
• Ex mark
• Testing agency/test certificate
• Testing agency/test certificate (optional) Year of production
• Week of production
• Serial number
• Switching capacity

Example

Mounting

General

• Installation position acc. to DIN 16257; NL 0 to NL 90

Opening the case

Mounting the switching head

1. With a rigid shaft
2. With a wall mounting

For a double thermostat.

Protection tube mounting

• The appliances may only be operated with suitable protection tubes.
• Do not use any protection tube in medium air.
• For the version with capillary, secure the probe against dropping using the clamping bracket (1).
• Ensure that the temperature probe (2) completely im-merges into the medium.

Settings/Functions

Setpoint value/limit value adjustment

TW/STW/STB
Adjust the setpoint value/limit value with a screwdriver.

Important information for installation and operation!
When used as a safety device for explosion protection in com-pliance with directive 2014/34/EU, it is necessary to run a functio-nality test in accordance with the applicable requirements. The installer must establish the switching point in a routine thermal test and put safeguards in place to prevent it being changed. Atten-tion should be paid to:

• Probe geometry and thermal coupling
• Max. ambient temperature
• Max. product temperature

Setting the limit value in accordance with the scale:

• Use the internal scale to set the limit value on the setpoint adjus- ter (Do not exert mechanical pressure to the setpoint value spin-del).
• Safeguard the setting by sealing the setpoint adjuster (e.g. with temperature-resistant screw-locking varnish).

Setting the limit value in accordance with installation-specific operational characteristics:

• Heat the temperature probe in the unit to the required limit temperature (temperature adjustment time at least 5 minutes), recording and monitoring the exact temperature on the temperature probe with a calibrated reference measuring device.
• Turn the setpoint adjuster from the scale limit value towards the scale start value, determine the required switching point position (circuit 1 to 2 opens and electrical circuit 1 to 4 is closed).
• Safeguard the setting by sealing the setpoint adjuster (e.g. with temperature-resistant screw-locking varnish).

STB reset
The STB can be reset (M1) when the temperature has fallen about 10 % below the limit value.

Response to measuring system fracture
If the measuring system is destroyed (i.e. the expansion liquid leaks) then the membrane pressure falls and the circuit will be permanently opened in the case of an STW or STB. On an STB, resetting is no longer possible.

Response to low temperature
The electrical circuit opens when cooling the probe of STW or STB down to the negative temperature range, but it then closes again if the temperature unlocks itself automatically.

Installation

Applicable regulations for electrical connections in a potentially explosive area must be followed!

Regulations and notes

• Electrical connection must only be carried out by qualified personnel.
• The choice of cable, the installation and the electrical connection must conform to the requirements of VDE 0100 “Regulations for the installation of power circuits with nominal voltages below 1000 V” or the appropriate local regulations.
• If contact with live parts is possible when working on the device it must be completely disconnected from the electrical supply.
• Ground the device to the protective earth at the PE terminal. The cross section of this cable must be at least the same as that of the supply cables. Wire the grounding conductors in a star configuration to a common earth point that is connected to the protective earth of the voltage supply. Do not loop the grounding cables, that is, do not run them from one device to another.
• Apart from faulty installation, incorrect settings on the thermostat may also adversely affect the proper functioning of the process or cause other damage. Adjustments should only be made by qualified personnel. The relevant safety regulations must be observed.

Electrical connection

• Prepare the cables. (A) Use a suitable crimping tool
• Run the connecting cable (Ø 7 to 13 mm at M20 or Ø 10 to 17 mm at M25) through the Ex cable gland (1).
• Make the connection in accordance with the wiring diagram on the terminal block (2), suitable for connection cross section 0.5 to 4 mm2.
• Attachment type X (no special tools).
• The connecting cable must be permanently installed.
• Connect the protective earth to the “PE” terminal.
• Position the connecting cable in the case and tighten the EX cable gland with the following tightening torque:

Wiring diagrams

• = upward adjustment
• = downward adjustment

Technical data

Examination certificate

Further information and downloads

• qr-605055-de.jumo.info
• qr-605055-en.jumo.info
• qr-605055-fr.jumo.info

Read these operating instructions before commissioning the device. If any difficulties should arise during commissioning, please contact the supplier or the head office. Do not undertake any unauthorized manipulations or actions.The warranty claim expires!

JUMO GmbH & Co. KG
Moritz-Juchheim-Straße 1
36039 Fulda, Germany
Tel.: +49 661 6003-0
Fax: +49 661 6003-500
mail@jumo.net
www.jumo.net

JUMO Mess- und Regelgeräte GmbH
Pfarrgasse 48
1230 Wien, Austria
Tel.: +43 1 610610
Fax: +43 1 6106140
info.at@jumo.net
www.jumo.at

JUMO Mess- und Regeltechnik AG
Laubisrütistrasse 70
8712 Stäfa, Switzerland
Tel.: +41 44 928 24 44
Fax: +41 44 928 24 48
jumostaefa@jumo.net
www.jumo.ch

JUMO Instrument Co. Ltd.
JUMO House
Temple Bank, Riverway
Harlow, Essex, CM20 2DY, UK
Phone: +44 1279 635533
Fax: +44 1279 625 029
info.uk@jumo.net
www.jumo.co.uk

JUMO Process Control, Inc.
6733 Myers Road
East Syracuse, New York 13057, USA
Phone: 315-437-5866
Fax: 315-437-5860
info.us@jumo.net
www.jumousa.com

JUMO Régulation SAS
7 Rue des Drapiers
57075 Metz Cedex 03, France
Tél: +33 3 87 37 53 00
Fax: +33 3 87 37 89 00
info.fr@jumo.net
www.jumo.fr

JUMO AUTOMATION S.P.R.L./P.G.M.B.H. / B.V.B.A
Industriestraße 18
4700 Eupen, Belgique
Tél.: +32 87 59 53 00
Fax: +32 87 74 02 03
info@jumo.be
www.jumo.be

References

• Automatisierte Mess- & Sensortechnik für die Industrie
• Geautomatiseerde meet- en sensortechnologie voor de industrie
• Automatisierte Mess- & Sensortechnik für die Industrie
• Automated measurement and sensor technology for the industrial sector
• Mesure automatisée et technologie des capteurs pour l'industrie
• Locations worldwide

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