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
21
TWR-1...
21
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
y
p
TWR-1/2 TWR-3/4
30…90 °C +-5 K +-3 K
100…120 °C +-7 K +-4 K
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