- Process- and system-specific production
- Operating limits: - Operating temperature: T = -196 ... +450 °C - Operating pressure: P = vacuum to 400 bar - Limit density: ρ ≥ 340 kg/m3
- Wide variety of different process connections and materials
- Mounting of level transmitters and magnetic switches possible as an option
- Explosion-protected versions
 Datasheet |
| User Manual |
- Process- and procedure-specific production
- Operating limits: - Operating temperature: T = -60 ... +300 °C - Operating pressure: P = Vacuum to 40 bar
- Wide variety of different process connections
- Mounting of level sensors and magnetic switches possible as an option
- Explosion-protected versions
| Datasheet |
| User Manual |
Level Indicators by WIKA / KSR Kuebler – rugged, highly legible local level display
Level indicators from WIKA / KSR Kuebler visualize tank/vessel level on site—clearly readable, optionally with electrical feedback. Common designs include magnetic flap indicators (bypass type), float/Reed-chain indicators, sight-glass indicators and scale/rod systems for plant and tank applications.
Depending on model: ATEX/IECEx, SIL, high-pressure/high-temperature, hygienic design, corrosion/seawater resistance, limit switches (Reed/Hall/magnetic), transmitters (4–20 mA/HART, Modbus/RS-485, IO-Link), metric scales, and process connections G/NPT, PN/ANSI flange or clamp/Varivent.
ICS Schneider Messtechnik supports sizing (density/temperature/pressure), materials, switch/transmitter configuration, calibration and PLC/SCADA/IIoT integration.
FAQ on Level Indicators (WIKA / KSR Kuebler)
Answers on principles, selection, accuracy, installation, materials, switches/signals, hygiene/ATEX/SIL and maintenance.
Which types exist and where are they used?
| Type | Principle | Strengths | Typical application |
|---|---|---|---|
| Magnetic flap indicator (bypass) | Float with magnet flips external flap/roller scale | Excellent readability, high T/p capability, no process window | Process vessels, chemical, energy, offshore |
| Reed-chain / magnetostrictive | Float moves along sensor rail | Continuous signal (4–20 mA), fine resolution | Tank gauging, inventory |
| Sight-glass indicator | Direct view of medium/float | Simple, economical, quick check | Utilities, non-critical media |
| Scale/rod systems | Mechanical display on tank | Media independent, very robust | Machine/vehicle tanks |
How does a magnetic flap indicator work?
A float in the bypass follows the tank level. Its permanent magnet actuates external flaps or a roller/flag scale, forming a clear color band readable from a distance.
What accuracy can I expect?
Reading accuracy is typically ±5…10 mm (flap/scale resolution). Electronic transmitters (Reed chain/magnetostrictive) achieve about ±2…5 mm or better—depending on design and installation.
Which media and conditions are supported?
Liquids from low to high viscosity, including moderate solids content. Temperature/pressure ranges are model-dependent; special versions exist for high pressure/high temperature and cryo.
What materials are available?
Bodies in 1.4404/316L, 1.4571, Hastelloy®, duplex, titanium or plastic-lined. Seals EPDM/FKM/PTFE/FFKM. Scales/windows with protective covers against UV/impact.
Can I add limit switches and a transmitter?
Yes. Magnetic switches (Reed/Hall) can be clamped to the bypass and positioned as needed. You can also add transmitters (Reed chain or magnetostrictive) for 4–20 mA/HART or IO-Link.
How is the right float selected?
By density (ρ), temperature, pressure, viscosity and medium. Density sets buoyancy; for varying ρ use adapted floats or apply corrections.
Which process connections are offered?
PN/ANSI flanges, G/NPT threads, clamp/Varivent (hygienic) and custom interfaces. Bypass indicators typically use side top/bottom nozzles on the vessel.
How do I install a bypass indicator?
- Side mounting with upper/lower take-off (add isolation valves).
- Provide venting at top and drain at bottom.
- Mount straight and stress-free; add insulation/heating if required.
Are ATEX/IECEx or SIL versions available?
Yes. Many models support Ex i/Ex d; electronic add-ons (switches/transmitters) with matching approvals. SIL use requires proof, proof-test intervals and suitable evaluation.
How do density and temperature influence the reading?
With the float principle, the float position is density-dependent. Density changes slightly shift the indication. Temperature affects ρ and viscosity—consider this during design.
What matters in hygienic applications?
316L, flush/crevice-free connections (clamp/Varivent), FDA/EU 1935/2004 seals, CIP/SIP resistance, polished surfaces and supporting certificates.
Can I display interfaces (oil/water)?
Yes. With interface floats and the proper bypass geometry the phase boundary can be shown; add a transmitter for continuous output if needed.
What IP ratings are typical?
Indicator housings are usually IP65…IP67; electronics may be IP67/IP69K. For outdoor use add UV protection and corrosion-resistant fasteners.
How is electrical connection made?
Switches with PNP/NPN or relay/Namur, transmitters with 4–20 mA/HART, Modbus/RS-485 or IO-Link. Use M12/circular plugs or junction boxes; route cables per EMC best practice.
What tests/acceptance can be provided?
Pressure/leak tests, EN 10204-3.1 material certificates, factory/DAkkS calibrations for transmitters and FAT per client plan.
How are switching points set?
Magnetic limit switches are slidable along the scale; lock in place, verify with a test magnet, and document set values.
What are typical pitfalls?
- Wrong float (ρ/T) → pick the correct float type
- Too large magnetic gap → set proper distance for flaps/switches
- Build-up/particles → add rinsing/cleaning provisions
- Air trapped in bypass → vent properly; ensure correct flow direction
- EMC issues on transmitter → shielded cable and grounding
Maintenance & cleaning—what’s sensible?
Regularly check mechanics (free-moving flaps), mounts, tightness and scale/window condition. In CIP/SIP service verify chemical compatibility. Function-test electronics periodically.
Do you support selection, sizing & commissioning?
Yes. We size the bypass & float, define materials/connections, configure switches/transmitters, supply calibration certificates and integrate into PLC/SCADA/IIoT with documentation.