Operating instructions manual [PDF] (18 pages)
- Updated: 14.04.2026
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Operating Instructions
for
Level Switch for Liquids
Model: RFS
RFS
page 2
RFS K02/0118
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
7. Mechanical Connection ................................................................................. 5
8. Electrical Connection .................................................................................... 6
9. Technical Information .................................................................................... 8
10. Order Codes ................................................................................................. 9
11. Dimensions ................................................................................................. 10
12. EU Declaration of Conformance .................................................................. 11
13. ATEX-Certificate ......................................................................................... 12
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
RFS
RFS K02/0118
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 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.
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:
Level Switch
model: RFS
Operating Instructions
4. Regulation Use
Model RFS devices are used for when monitoring liquid levels. The device should
only be used with liquids that are compatible with the unit’s materials of
construction.
Level control is often accomplished with at least two level switches - one acting to
sense the minimum level and the other for maximum level detection.
Any use of the Level Switch, model: RFS, which exceeds the manufacturer’s
specification, may invalidate its warranty. Therefore, any resulting damage is not
the responsibility of the manufacturer. The user assumes all risk for such usage.
RFS
page 4
RFS K02/0118
5. Operating Principle
The Level Switch RFS is designed for economical control of liquids in vessels.
The following three versions are available: A device with plug connection and two
devices with aluminium housing connection of which one is an ATEX-version for
the use in environment with gas explosion hazards. The switch is remarkable for
its maintenance-free design and small dimensions. The switch is mounted on the
side of the vessel. A hinged stainless steel float with a magnet floats up and down
through the liquid level. In the end position a potential-free reed contact is
operated by the magnet. The switching function (N/O contact / N/C contact) is
determined by the mounting position. The switching function is reserved by
simply rotating the switch through 180°.
6. Use in Hazardous Areas
With the approval the Level Switch, model RFS, can be used within hazardous
areas. Thereby the aluminium housing is applicable outside the process in zone
of category 2D. The float is appropriate for the use within the process in zone of
category 2D and 1D.
The approvals are as follows:
II 1 GD Ex ia IIC T6 Ga
-20≤Ta≤+60 °C
An additional intrinsically safe relay is required in environment with gas explosion
hazards (KFA…and respectively KFD).
For a correct and professional potential equalization, the ground terminal on the
housing of the RFS must be connected in applications in hazardous areas.
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