Kobold DSV Series User manual

Operating Instruction
for
Float-Type Flow Meter
and Switch
Model: DSV-...

DSV
page 2 DSV K09/0322
1. Contents
1.Contents ........................................................................................................ 2
2.Note .............................................................................................................. 3
3.Instrument Inspection .................................................................................... 3
4.Regulation Use ............................................................................................. 4
5.Operating Principles ...................................................................................... 5
6.Mechanical Connection ................................................................................. 6
7.Electrical Connection .................................................................................... 7
7.1.DSV-2... and DSV-3 ........................................................................... 7
7.2.Note for reed switch ........................................................................... 7
7.3.Examples of contact protection devices ............................................. 7
8.Use in hazardous area .................................................................................. 8
8.1.Statement an apparatus not containing an own potential ignition
source ................................................................................................ 8
8.1.ATEX reed contact 41R57** .............................................................. 9
9.Commissioning............................................................................................ 16
10.Maintenance ............................................................................................... 17
11.Technical Information .................................................................................. 18
12.Order Codes ............................................................................................... 19
13.Recommended Spare Parts ........................................................................ 20
14.Dimensions ................................................................................................. 21
15.EU Declaration of Conformance (DSV) ....................................................... 22
16.UK Declaration of Conformity (DSV) ........................................................... 23
17.EU Declaration of Conformance (Reed contact 41R57**) ........................... 24
18.Statement of conformity reed contact 41R57** ........................................... 25
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.kobold.com

DSV
DSV K09/0322 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
In acc. with Article 4 Paragraph (3), "Sound Engineering Practice", of the
PED 2014/68/EU no CE mark.
Table 8, Pipe, Group 1 dangerous fluids
3. Instrument Inspection
Instruments are inspected before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of
the delivery packaging. In case of damage, please inform your parcel service /
forwarding agent immediately, since they are responsible for damages during
transit.
Scope of delivery:
The standard delivery includes:
 Float-Type Flow Meter / Switch model: DSV

DSV
page 4 DSV K09/0322
4. Regulation Use
The model DSV is employed for the measurement and monitoring of liquid flows
which are homogeneous, free from impurities and have a low viscosity. In
addition, they must be compatible with the materials used in fabrication of these
units. High viscosity media can introduce considerable measurement errors. Also,
large dust particles can block the float, resulting in error-messages and erroneous
measurements. In addition, ferrite particles that may deposit on the embedded
magnets of the float can trigger the same effect. To overcome this problem, the
installation of a magnetic filter is recommended.
The units are provided as follows:
Flow measurement
The reading of the present media flow takes place on site. The top edge of the
float indicates the flow directly in l/min (water) on the scale attached to the
graduated measuring glass.
Limit-contacts (only with model DSV-2... and DSV-3...)
To monitor the flow values, the units are provided with one or two adjustable limit-
contact(s).
Standard version: Normally Open function (with increasing flow)
Special version: Change-over contact function
The switch contact is adjustable over most of the measuring range of the device,
under consideration of the switch hysteresis.

DSV
DSV K09/0322 page 5
5. Operating Principles
The proven KOBOLD flow meters and switches
model DSV are based on the principle of the
well-known float-type flow meters except for the
conventional tapering measuring tube.
These patented instruments are provided
instead with a cylindrical flow tube with conical
slots around the periphery. This eliminates the
usual problems of guiding the cylindrical float
within a tapering measuring glass. The novel
design including the provision of an
appropriately dimensioned annular gap of
constant width between the float and the flow
tube has enabled the sensitivity to dirt to be
considerably reduced.
The float contains a permanent magnet which
actuates a bistable reed contact external to the
flow circuit, that is, the flowing medium is
hermetically separated from the electrical
contact. In addition, it is embedded in a height-
adjustable switch housing thus ensuring that
the contact is protected even in an aggressive
atmosphere.
As the medium enters the instrument the float
rises. Once its magnetic field reaches the
contact tips of the reed switch the contact
closes. As the flow increases the float rises
further until it reaches its stop. This prevents
the float from going beyond the contact range
of the magnetic operating tube, that is, the
contact remains closed thus ensuring bistable
switching. The top edge of the float serves to
indicate the flow on the measuring glass in
L/min.
Flow

DSV
page 6 DSV K09/0322
6. Mechanical Connection
Before installation:
 Make sure that the permitted max. operating pressure and temperature limits
are not exceeded (see section 11. Technical Information)
 Remove all transport safety locks and ensure that no remains of packing
material reside inside the unit.
 The sealing of union fittings is carried out through Teflon tape or similar
material.
 During installation of these devices, attention must be paid that no large
course or pressure-load is exercised on the union fittings. We recommend
fastening the inlet and outlet line at approx. 50 mm distance mechanically,
from the union fittings.
 The units may not be installed at a location within an inductive field.
Attention! The union fittings of these devices must be held
fixed by means of a suitable wrench while screwing in.
Otherwise, stresses will transfer to the housing which may
lead to the destruction of graduated measuring glass.
 If possible, it should be checked after mechanical installation whether the
connections between union fittings and pipes are properly sealed
Attention! While installing in a free and open environment,
please pay attention to the fact that the freezing of medium
can destroy the measuring tube.

DSV
DSV K09/0322 page 7
7. Electrical Connection
7.1. DSV-2... and DSV-3
 Make sure that the electrical supply wires are powerless.
 Undo the locking screw on the plug cap and remove the plug
from the socket.
 Mount supply line in the plug cap as shown in the wiring
diagram.
 If the contact has not been adjusted, adjust it now. (see
section 9. Commissioning).
 Place the plug on the socket and fasten it with the safety-
screws. (see section 9. Commissioning).
7.2. Note for reed switch
Attention! Every single specified electrical value for the sealed
contact should not be exceeded even for short periods. We
recommend contact protection relays or other contact protection
device for higher switching values.
 When the external devices have been connected to the limit contact and the
switch point has been set, the electrical connection is complete.
 The instrument can now be placed into operation.
7.3. Examples of contact protection devices
For capacitive and inductive loads, (long leads and relays/contactors) we
recommend contact protection relays or the following suppressor circuits.

DSV
page 8 DSV K09/0322
8. Use in hazardous area
8.1. Statement an apparatus not containing an own potential
ignition source

DSV
DSV K09/0322 page 9
8.1. ATEX reed contact 41R57**
ATEX N/O contact 41R57
II 3G Ex ic IIC T4 Gc
II 3 D Ex ic IIIC T125 °C Dc
-20 °C ≤Ta≤80 °C
max. 250 VAC/DC/1.5 A/100 W/100 VA
ATEX changeover contact 41R57U
II 3G Ex ic IIC T4 Gc
II 3 D Ex ic IIIC T125 °C Dc
-20 °C ≤Ta≤80 °C
max. 250 VAC/DC/1 A/30 W/60 VA

DSV
page 10 DSV K09/0322
Ex-relevant excerpt of the operating instructions of the reed contact
41R57 **
1. Preambel
This excerpt of the operating instructions only represents the ex-relevant aspects.
It is copied into the original operating manual in the same or analogous form;
Textual changes are permitted; the ex-relevant statements remain.
To ensure the function and for your own safety, please read the enclosed
operating instructions carefully before you begin the installation. If you have any
questions, please contact the KOBOLD Messring GmbH, Hofheim. It applies with
the original operating instructions.
The following standard issues were considered in the evaluation of the product:
a) IEC 60079-0:2017 Ed. 7 / EN 60079-0:2018 Explosive atmospheres –
Part 0: Equipment - General requirements
b) IEC 60079-11:2011 Ed. 6 + Corr. 2012 / EN 60079-11:2012 Explosive
atmospheres - Part 11: Equipment protection by intrinsic safety "i"
2. General information on explosion protection
The reed switches work together with various KOBOLD products and serve there
for monitoring. It is available as N/O contact or changeover contact.
The electrical connection is made via a plug - only in intrinsically safe systems.
The reed switch is intended for commercial use and may only be used in
accordance with the specifications in the technical documentation of Kobold and
the information on the nameplate. It is only operated together with certified
products via an intrinsically safe circuit. They comply with the valid standards and
regulations.
The installation regulations (e.g. EN 60079-14) for systems in potentially
explosive atmospheres must be observed.
Further important details can be found in the corresponding EC-type examination
certificate.
Permitted use
• The intrinsically safe reed switch can be used as follows:
• In Zone 2 (Gas-Ex, EPL Gc) in explosion groups IIA, IIB and IIC
• In Zone 22 (Dust-Ex, EPL Dc) in explosion groups IIIA, IIIB and IIIC
• The requirements for simple electrical equipment for use in intrinsically safe
circuits in zones 1/21 are fulfilled.
• The qualification regarding the surface temperature is T4. For all gases, vapors,
mists with an ignition temperature> 135 ° C the equipment is not an ignition
source.
• In the dust Ex area, 125 ° C is the reference temperature for further
consideration regarding the safety distance from the smoldering temperature.
• The ambient temperature range is -20 ° C ≤ Ta ≤ 80 ° C.