Page 1
Operating Instructions
for
Low-Volume Flow Switch
Model: SVN / KSR
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SVN/KSR
1. Contents
1. Contents ........................................................................................................ 2
2. Note .............................................................................................................. 3
3. Instrument Inspection .................................................................................... 3
4. Regulation Use .............................................................................................. 3
5. Operating Principle ........................................................................................ 4
6. Use in Hazardous Areas ............................................................................... 4
6.1. General ................................................................................................ 4
6.2. Electrical Contact ................................................................................. 5
6.3. Potential Equalisation .......................................................................... 5
7. Mechanical Connection ................................................................................. 5
8. Electrical Connection .................................................................................... 6
8.1. SVN-1200 (Namur) .............................................................................. 6
8.2. SVN-1201 (Proximity Switch) ............................................................... 6
8.3. KSR with Reed Contact ....................................................................... 7
9. Maintenance ................................................................................................. 8
10. Technical Information .................................................................................... 8
11. Order Codes ................................................................................................. 9
12. Dimensions ................................................................................................... 9
13. Declaration of Conformance ....................................................................... 10
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim, Germany
Tel.: +49 (0)6192-2990
Fax: +49(0)6192-23398
E-mail: info.de@kobold.com
Internet: www.kobold.com
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SVN/KSR
2. Note
Please read these operating instructions before unpacking and putting the unit
into operation. Follow the instructions precisely as described herein.
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 EWG-machine guidelines.
as per PED 97/23/EC
In acc. with Article 3 Paragraph (3), "Sound Engineering Practice", of the
PED 97/23/EC no CE mark.
Diagram 6, 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:
• Low-Volume Flow Switch model: SVN / KSR
• Operating instructions
4. Regulation Use
Any use of the Flow Switch, model: SVN/KSR, which exceeds the manufacturers
specification may invalidate its warranty. Therefore any resulting damage is not
the responsibility of the manufacturer. The user assumes all risk for such usage.
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SVN/KSR
5. Operating Principle
The KOBOLD flow switch types SVN and KSR operate on the known suspended
float principle of measurement and are suited for liquids and gases.
This switch must be fitted vertically with the media flowing from bottom to top.
Set point
The flow switch is designed for small flows. The set point is set at the factory to
the value specified by the customer (a decreasing or increasing flow rate is
specified).
6. Use in Hazardous Areas
6.1. General
The Low-Volume Flow Switch, model: KSR, does not have a potential igniting
source of its own as a mechanical operating resource; it does not get any
identification according to the guideline 94/9/EC ("ATEX 100a”).
The mounted contact can be used in intrinsically safe circuits as a “simple
apparatus” according to EN 60079-14. The following limit values for the switching
contact should not be exceeded: U = 30 VUC, I = 100 mA, P = 1,2 W.
The measurement units can be used as follows:
a) In the Zone 2 (Gas-Ex, Cat. 3G) in explosion group of IIA, IIB and IIC
b) In the Zone 22 (Dust-Ex, Category 3D) with non-conductive dusts with a
minimum igniting energy of > 3 mJ
c) In the Zone 1 (Gas-Ex, Cat. 2G) into explosion group of IIA, IIB and IIC
d) In the Zone 21 (Dust-Ex, Category 2D) with non-conductive dusts with a
minimum igniting energy of > 3 mJ
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6.2. Electrical Contact
The Low-Volume Flow Switch, model: KSR, can be used in the Ex-area
according to category 2G, 2D Cluster II, in Zone 1 and 21, in zone 1 and 21 in
connection with a switching amplifier for protection type Ex II (2)GD [EEx ia] IIC
(intrinsically safe)
The electrical connection is explained in the section 8 Electrical Connection.
6.3. Potential Equalisation
The Low-Volume Flow Switches, model: KSR, have to be incorporated in the
potential equalisation system of the system. This is done by the connection tube
made of metal.
7. Mechanical Connection
Before installation:
• Remove all packing materials and transport retainers and ensure that no such
materials remain in the device.
• Make sure that the maximum operating pressure and temperature of the device
are not exceeded (see 10 Technical Information).
• Install the flow switch in the piping system, ensuring that the piping is rigidly
supported at the inlet and outlet of the switch with pipe clamps
• Ensure that the piping is aligned with the inlet and outlet fittings and the no
piping induced stresses are exerted in the switch. This stress can result in
damage to the switch during system operation
• Protect the measuring tube from external damage.
• Avoid pressure surges in the measuring tube, such as those arising from fast
start up/shut off of flow or pulsating flow.
• If possible, after completing the mechanical installation, check the threaded
connection between the device and the piping for leakage immediately.
For complete information on the proper installation of float-type flow
meters, see VDI/VDE Directive 3513.
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8. Electrical Connection
• Make sure that the electrical supply lines are de-energized when connecting
the device!
• Connect the power supply line to the device connection as shown in the
illustration below.
8.1. SVN-1200 (Namur)
Supply/
UB = 7.7 – 9 VDC , 2-wire
Attention! The electrical values specified for the proximity switch
must not be exceeded.
8.2. SVN-1201 (Proximity Switch)
UB = 10 – 30 VDC , 3-wire
Output: NPN, N/O contact
Attention! The electrical values specified for the proximity switch
must not be exceeded.
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8.3. KSR with Reed Contact
SPST contact
SPDT contact
Attention! The electrical values specified for the contact must not
be exceeded, even for a short time. For higher switching capacities,
we recommend installation of our contact protection relay (such as
model MSR) or other contact protection measures.
After connection of all necessary external devices to the limit contact, the device
is completely set up and can now be placed in operation.
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9. Maintenance
If the medium to be measured is not dirty, SVN/KSR Flow Monitors are
essentially maintenance-free. However, any lime or dirt deposits on the housing
or the internal parts should be removed regularly.
To clean the flow monitor, proceed as follows:
• Make sure that the electrical supply lines are de-energized.
• Unscrew the flow monitor from the line.
• To disassemble the flow monitor, remove the stud screws.
• Clean the flow monitor in a cleaning bath or in an ultrasonic bath.
• When reassembling the flow monitor, be sure that the gaskets are seated
properly.
10. Technical Information
Switching ranges (permanently set)
Water : 2 – 250 cm3/min (model SVN)
2 – 160 cm³/min (model KSR)
Air: 50 – 6000 Ncm³/min at 1013 mbar; 20 °C
Technical Details
Connection: G 1/4 female
(1/4 NPT optional)
Protection: IP 67
Max. pressure: 16 bar
Max. temperature: 70 °C
Materials
(media contacting): St. steel 1.4305; borosilicate glass
Gasket: FPM
Average electrical switch contact life (MTTF):
at max. electrical load: 105 switching operations
at half load (<10%max. load): 5*107 switching operations
at low load (<10V/<1mA): 108 switching operations
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SVN/KSR
11. Order Codes
Order Details (Example: SVN-1200 W R08; 100 cm³/min decreasing flow rate)
Order number Limit switch Medium
SVN-1200
SVN-1201
KSR-1200
KSR-1201
*We recommend our transistor relay for the Namur switch: for example
model REL-6000 (230 V
Switch Namur*
7.7 - 9 V
Switch DC voltage 10 - 35 V
3-wire, NPN, N/O contact
Reed contact N/O contact
24 V / 0.1 A / 1 Watt
Reed contact changeover cont.
100 V / 0.5 A / 5 Watt / VA
2 - wire
DC,
DC
, 1 changeover contact, 4 A/ 500 VA)
DC
,
W = Water
L = Air
12. Dimensions
Connection
(female)
R08 = G 1/4
N08 = 1/4 NPT
(please specify in writing)
For example: 100 cm³/min.
decreasing flow rate
Set point
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13. Declaration of Conformance
We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Low-Volume Flow Monitor Model: SVN-1201
to which this declaration relates is in conformity with the standards noted below:
DIN EN 50081-1 03/1993
Electromagnetic compatibility (EMC) - Basic specification: Interference emission
DIN EN 50082-2 04/1995
Electromagnetic compatibility (EMC) - Basic specification: Noise immunity
DIN EN 61010-1 01/2001
Safety requirements for electrical measuring, control and laboratory instruments
Also in conformance with the specifications in the following EEC directives:
2004/108/EC EMC Directive
Hofheim, 10. March 2007
H. Peters M. Wenzel
General Manager Proxy Holder
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SVN/KSR
We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Low-Volume Flow Monitor Model: KSR-...
to which this declaration relates is in conformity with the standards noted below:
DIN EN 61000-4-4 04/1995
Electromagnetic compatibility (EMC) BURST
DIN EN 61010 01/2001
Safety requirements for electrical measuring, control and laboratory instruments
Also in conformance with the specifications in the following EEC directives:
2006/95/EC Low Voltage Directive
Hofheim, 10. March 2007
H. Peters M. Wenzel
General Manager Proxy Holder
SVN/KSR K01/0413 Page 11
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