Kobold TWR Manuale utente

Operating Instructions

for

Temperature Switch

Model: TWR

TWR

page 2 TWR K10/0322

1. Contents

1.Contents ........................................................................................................ 2

2.Note .............................................................................................................. 3

3.Regulation Use ............................................................................................. 3

4.Operating Principle ........................................................................................ 4

5.Instrument Inspection .................................................................................... 4

6.Use in Hazardous Areas ............................................................................... 5

6.1.General ................................................................................................ 5

6.2.Electrical Contact ................................................................................. 5

6.3.Equipotential Bonding .......................................................................... 5

6.4.Warnings for use in hazardous areas .................................................. 6

7.Mechanical Connection ................................................................................. 7

8.Electrical Connection .................................................................................... 7

9.Maintenance ................................................................................................. 9

10.Accessories ................................................................................................... 9

11.Technical Information .................................................................................. 10

12.Order Codes ............................................................................................... 11

13.Dimensions ................................................................................................. 12

14.EU Declaration of conformance ATEX version ........................................... 13

15.EU Declaration of Conformance Standard version ..................................... 14

16.UK Declaration of Conformity Standard version .......................................... 15

Manufactured and sold by:

Kobold Messring GmbH

Nordring 22-24

D-65719 Hofheim

Tel.: +49(0)6192-2990

Fax: +49(0)6192-23398

E-Mail: [email protected]

Internet: www.kobold.com

TWR

TWR K10/0322 page 3

2. Note

Please read these operating instructions before unpacking and putting the unit

into operation. Follow the instructions precisely as described herein.

The instruction manuals on our website www.kobold.com are always for currently

manufactured version of our products. Due to technical changes, the instruction

manuals available online may not always correspond to the product version you

have purchased. If you need an instruction manual that corresponds to the

purchased product version, you can request it from us free of charge by email

([email protected]) in PDF format, specifying the relevant invoice number and

serial number. If you wish, the operating instructions can also be sent to you by

post in paper form against an applicable postage fee.

The devices are only to be used, maintained and serviced by persons familiar

with these operating instructions and in accordance with local regulations

applying to Health & Safety and prevention of accidents.

When used in machines, the measuring unit should be used only when the

machines fulfil the EC-machine guidelines.

as per PED 2014/68/EU

No CE mark

The minimum service life is 100,000 switching cycles at a maximum of 150 °C

when the switching capacities specified in the operating instructions are

observed.

3. Regulation Use

TWR model devices are used to monitor the temperature of liquids. The

temperature switches are delivered with a preset temperature switching value

with N/O or N/C contacts. Only liquids to which the thermostat materials are

resistant should be monitored.

TWR

page 4 TWR K10/0322

4. Operating Principle

The switching element in the model TWR is a thermal time-delay switch. Two

strips of metal with different coefficients of thermal expansion are rolled together

in the switch. When temperature is applied the bimetal reed bends and thus

opens/closes the contact. The switching function is current-independent.

5. Instrument Inspection

The devices are inspected before shipping and are sent out in perfect working

condition. Should there be any visible damage to the device, we recommend that

the delivery packaging is carefully examined. Immediately inform the postal

service or forwarding agency in the event of a claim, as the haulier is responsible

for damage in transit.

Scope of delivery:

The standard delivery includes:

 Temperature Switch model: TWR

TWR

TWR K10/0322 page 5

6. Use in Hazardous Areas

6.1. General

The temperature switches TWR-3 **** and TWR-4 **** can be used as follows

(taking into account the notes and the approved electrical limit values):

a) In zone 2 (Gas-Ex, EPL Gc) in explosion group IIA, IIB and IIC

b) In zone 22 (Dust Ex, EPL Dc) in explosion groups IIIA, IIIB and IIIC

c) In zone 1 (Gas-Ex, EPL Gb) in explosion group IIA, IIB and IIC, if the

temperature switch is operated via an intrinsically safe isolation amplifier

taking into account the defined characteristic data.

d) In zone 21 (Dust Ex, EPL Db) in explosion groups IIIA, IIIB and IIIC, if the

temperature switch is operated via an intrinsically safe isolating amplifier

taking into account the defined characteristic data.

The temperature switch also fulfills the requirements for a simple apparatus

according to EN 60079-14, section 12 and EN 60079-11, section 5.7.

6.2. Electrical Contact

The following limit values for the switching contact must not be exceeded:

Max. Switch capacity: Ui IIC = 30 V AC / DC

Ui IIB = 45 V AC / DC

Switching current: li IIC = 150 mA

li IIB = 250 mA

li IIIB = 250 mA

PiII = 1.2 W 40° C 550 mW @ 125° C

Li = negligible

Ci = negligible

The electrical connection is explained in section 8 Electrical Connection.

6.3. Equipotential Bonding

In order to achieve potential equilibrium, the temperature switch should be

properly grounded. This will occur only when the connection pipes are made of

metal.

TWR

page 6 TWR K10/0322

6.4. Warnings for use in hazardous areas

a) Equalizing currents must not be routed through the metallic constructions.

b) The temperature switch must be installed so that possible electrostatic

charges can be charged off. (Leakage resistance to PA <1 MΩ)

c) The temperature switch should be protected against mechanical shocks.

d) At medium temperatures> 90 ° C the installation must ensure that the

plugs do not overheat.

e) Stuck parts, e.g. by frost or corrosion, must not be released by force in the

presence of an explosive atmosphere.

f) In order to ensure the protection against explosion, electrical equipment

and additional (mechanical) equipment must comply with the requirements

of the local conditions and must be checked separately by the installer of

the machine.

g) The ignition limit curves from EN 60079-11 must be taken into account

without a safety factor and must be complied with during installation.

h) The requirements for simple electrical equipment in the gas and dust

explosion area of zone 1/21 according to EN 60079-11 section 5.7 should

be met.

i) Operation only in intrinsically safe circuits.

j) A power reduction Pi according to 15c) must be complied with at higher

ambient temperatures.

k) The installer / operator must prepare a control drawing (proof of intrinsic

safety) and attach the explosion protection document.

TWR

TWR K10/0322 page 7

7. Mechanical Connection

Before installation:

 Make sure that the desired TWR switching temperature and switching function

corresponds with your plant requirements. The TWR data is to be found on the

metal nameplate (OFF = N/C contact, ON = N/O contact at the specified

temperature).

 Ensure that the permitted maximum operating pressures for the temperature

switches are not exceeded.

Installation:

 The TWR is installed in a G 3/4 fitting. Seal the connection threads with sealing

tape or a flat gasket.

 Chose the installation position so that the sensor tip is always immersed in the

liquid, thus optimising the heat exchange between medium and temperature

switch.

 Please note that solid deposits in soiled media may cause thermal

insulation and thus inaccuracies.

 If possible, after mechanical installation, check that the joint connection pipe

fitting is sealed.

8. Electrical Connection

Important! Ensure that voltage and current values in your plant do

not exceed the temperature switch values.

 Make sure that electrical supply lines are de-energized.

 Undo the retaining screw from the plug cap and remove the cap from the plug

socket.

 Install the supply line in the plug cap according to the wiring diagram below.

 Mount the connector on the contact base and fasten with the retaining screw.

The device is ready for operation when you have connected your external

devices to the limit output.

TWR

page 8 TWR K10/0322

Contacts

TWR-1...

TWR-2...

TWR-3... TWR-4...

TWR-1/3...

TWR-2/4..., N/O function

The contact closes when the

temperature rises and the switching

value has been reached or

exceeded. It opens again when the

temperature falls below the limit

value less the switching hysteresis.

Electrical wiring option –L and –G

(The circuit is placed inside of the connector in parallel to the contact, not for

ATEX version):

Option –L (24VAC/DC Option –G (230VAC)

TWR

TWR K10/0322 page 9

Hysteresis

Hysteresis is the difference between make and break points, which are at

different temperatures. The hysteresis is max.20 °C.

Example: TWR-110500

Contact opens at 50 °C ±5 °C

Contact closes at approximately 30 °C ±5 °C

Note: Temperature switches with low switching temperatures, when

used at high ambient temperatures, are only reset when the switch

is cooled to below the ambient temperature.

Example: TWR-210300, ambient temperature 25 °C

Contact closes at 30 °C ±5 °C

Contact opens at approximately 10 °C ±5 °C

(i.e., below ambient temperature)

9. Maintenance

The TWR requires no maintenance if the measured medium is clean. Dirt

deposits can cause inaccuracies or a malfunction. Depending on the degree of

soiling of your medium, we recommend that the devices are checked at regular

intervals.

10. Accessories

10.1) 2-pin connector with lamp 180–240 VAC incl. silicone gasket

(energized if contact is open)

10.2) 2-pin connector with LED 24 VDC/AC incl. silicone gasket

(energized if contact is open)

TWR

page 10 TWR K10/0322

11. Technical Information

Contact operation: N/O contact or N/C contact

Electrical connection: plug connector according to DIN EN 175301-803

optional with pilot lamp

Max. switch capacity: 250 VAC; 30 VDC; (TWR-1...0, TWR-2...0)

250 VAC; 42 VDC; (TWR-3...0, TWR-4...0)

24 VDC (TWR-...L)

230 VAC (TWR-...G)

Switching-current: 0.1...4 A (TWR-1...0, TWR-2...0)

0.1...1 A (TWR-1...L, TWR-2...L)

0.1...1 A (TWR-1...G, TWR-2...G)

max. 5...200 mA (TWR-3, TWR-4)

Housing: brass or stainless steel 1.4301

Connection: G 3/4 male

Nominal pressure: PN 64

Weight: 0.5 kg

Ambient temperature: -30…125 °C

Switching

hysteresis max.: 20 °C

Accuracy:

Protection: IP 65

Technical data ATEX version see section 6.2

switch points T

TWR-1/2 TWR-3/4

30…90 °C +-5 K +-3 K

100…120 °C +-7 K +-4 K

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