Level instruments & probes
Precise level measurement with our leakage probes and overfill protections, according to the German Water Resources Act (WHG) with EX approval and SIL
Full product range
Note for our customers: This is only an extract of our product range on the subject of level instruments. Our full product list with further information can be found here: E.L.B. Füllstandsgeräte (a company of ZILA GmbH).
If you have any questions, please do not hesitate to contact us, using the contact information provided. We will be pleased to fulfill your request.
Overfill protection devices / Ex / WHG / SIL
Our level sensors are approved as limit switches for overfill protection systems by the German Institute for Construction Engineering (DIBt) and are used for storing water-contaminating liquids. As soon as the level rises, the float switch activates the reed contacts installed in the guide tube through a magnetic system. Any change in resistance in the sensor circuit, triggered by switching, will then be evaluated by the system and the output relay will be activated. The wetted parts of the level sensors are entirely made of PE, PP, PCV, PVDF.
This makes the level sensors ideal for use in tanks storing extremely aggressive media.
More product information:
Overfill protction devices / Ex / WHG / SIL
Overview overfill protection devices
Leak detectors / Ex / WHG / SIL
Our leak detectors are approved by the German Institute for Construction Engineering (DIBt) for detecting leaking, water-contaminating liquids in accordance with the regulation "WasBauPVO". This regulation determines the qualification of construction products and types under German Water Law.
Amongst other locations of use, they can be applied in the space between a tank and its collection tray.
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Alarm indicators / WHG / SIL with approval by the German General Construction Supervision Authority
Alarm indicators are stand-alone devices for alarm indication and signalling an alert of an overfill protection device or a leakage probe. They detect limit value signals of the connected level sensors / leakage probes and trigger an acoustic signal (acknowledgeable) and an optical signal (non-acknowledgeable).
The main field of application and use, when used with an overfill level sensor and a leakage probe, is on-site tank monitoring.
More product information:
Contacts / Ex / SIL &
floats and weights
The floats and weights with magnetic elements are used along with our level instruments MTA, ÜTA and W-35...
The bistable contacts BK-380 and BK-390 are magnetically operated changeover switches, changing their electrical switching state, when a magnetic system passes by, depending on the direction of movement of the magnet. They can be (retro-)fitted onto level indicators, e.g. our water level indicator W-35..., the tank level indicator MTA-50 or the over-tank indicator ÜTA-32... etc. in order to control the liquid level.
Our floats and weights with magnetic insert are also used along with our MTA, ÜTA and W-35... level devices.
More product information:
Contacts / Ex / SIL & floats and weights
Electrodes &
Ex electrodes / zone 0 / WHG / SIL / Ex / SIL
When using a level electrode together with a ground electrode, it is possible to detect when the level exceeds or falls below a limit. The electrodes can be mounted in all positions. This allows the electrode rod to be screwed in manually.
Our conductive electrodes can be used in min-max controls, limit value signalling and as dry and overflow protection in combination with our electrode relays for example.
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Float switches / Ex / SIL / RoHS
Float switches are used for simple limit value detection. Because of the liquid's higher density, the float swims on its surface and triggers a switching operation when there is a deviation from its horizontal position. This is a simple way to control the level of fluids.
When using 2 float switches, one working as a maximum contactor and the other as a minimum contactor, you will achieve automatic level control. In addition, the float switches can be used as overflow and dry run protection.
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Magnetic immersible probes / zone 0 / Ex / WHG / SIL
Our magnetic immersible probes can detect level limits for liquid media in containers. Depending on the requirements, the materials used are PVC, PE, PPH, PTFE, brass or stainless steel (1.4571).
Our explosion-proof magnetic immersible probes can also be used to detect limit values in containers for liquid media, where an explosive atmosphere of category 1 (zone 0) can be found in the space above the liquid and category 2 (zone 1) outside the container in the area of the connection socket.
Due to the high-quality materials used, all of our magnetic immersible probes are also suitable for use with highly aggressive media.
More product information:
Magnetic immersible probes / Ex / SIL
Magnetic immersible probes zone 0 / WHG / SIL
Pneumatic level switches
Our pneumatic level switches are highly reliable and easy-to-use sensors for liquid detection, especially suitable for overflow protection. It does not matter whether the fluids are aggressive, sticky or highly contaminated - our level switches work reliably in any fluid, even the most contaminated ones.
Moreover, the switches can be used to signal minimum levels. However, use is only permitted in open and unpressurised containers, tanks, etc.
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Hydrostatic limit switches
Our hydrostatic limit switches have been designed for use in liquids, including aggressive liquids in unpressurised containers and tanks. The hydrostatic pressure of the medium used affects the membrane of the measuring cell inside the sensor and thus causes a change in an electrical parameter. This change is then converted into an output signal via an integrated electronic evaluation system.
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Vibration limit switch
The vibration limit switch is a level limit switch for any kind of fluid and is applied in tanks, containers and pipelines. For example, it can be installed in cleaning and filter systems as well as in coolant and lubricant tanks as an overfill or a pump protection. Its function is also ensured in areas where other measuring principles do not work, due to conductivity, deposits, turbulences, currents or air bubbles.
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One-channel and two-channel amps & transducer relays / Ex / WHG / SIL
The electrode relays are used for conductive level detection. Possible applications include all areas in which liquid, conductive media must be detected, controlled or regulated in any way. This can include both limit level detection (overflow / dry run) and min-max controls.
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Continuous immersible probe / SIL / Ex made of brass and stainless steel
The main application of our continuous magnetic immersible probes TK30... is continous liquid level detection in containers. Depending on the requirements, they are made of PVC, PE, PPH, PTFE, brass or stainless steel (1.4571).
This makes our magnetic immersible probes suitable even for use in highly aggressive media.
More product information:
Continuous immersible probes / SIL
Continuous immersible probes / Ex / SIL
Overview continuous immersible probes / SIL
Type codes and connections / SIL
Hydrostatic screw-in probe / SIL
In our hydrostatic screw-in probes, the hydrostatic pressure of the medium affects the diaphragm of the measuring cell in the sensor and causes a change of an electrical parameter. This change can then be converted into a corresponding output signal via an integrated electronic evaluation system.
It is used for level measurement in water and in clean to slightly contaminated liquids, as well as in acids, alkalis or aggressive media. Its main area of application includes unpressurised containers and tanks.
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Evaluation & display units / SIL
Our evaluation units convert a resistance signal supplied by our continuous immersible probes into a current signal proportional to the liquid level. This standard current signal (0 / 4...20 mA) can be used for displaying, registering and controlling levels or other process variables in a three-wire circuit.
The indicators, in contrast, are used when process states, such as filling levels, need to be displayed visually. Due to the fact that the input variables and the display range can be parameterised, they can be applied universally and are also perfectly suitable for difficult areas, e.g. a bright environment.
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Turbidity measurement
Our turbidimeter TRM-100 is a compact device for measuring turbidity in liquids. Turbidity is measured by the scattered light method (angle 90 degrees) for the turbidity range < 1,000 FNU (Formazine Nephelometric Units) and by the transmitted light method (angle 0 degrees) for the turbidity ranges > 1,000 FAU (Formazine Attenuation Units).
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Warning system / oil & grease separator / Ex / SIL
The warning system OAA-400-A1/A2 is used to monitor oil, petrol, grease or light liquid separator systems in hazardous areas.
Monitoring options: Accumulation: Monitoring of the maximum liquid level
Leakage detection: When the liquid level drops, e.g. in the event of a leak
Boundary layer: Monitoring of a defined oil layer thickness
Sludge level: Detection of the sludge level / sand
The condition of connected sensors as well as their signal lines are monitored for line break and line short circuit.
More product information:
Prices and availability
For an individual offer for our level instruments and probes, please contact us by phone at
+49-6251-8462-0 , by email under This email address is being protected from spambots. You need JavaScript enabled to view it. or by using our contact form.
Our experienced sales team is looking forward to your enquiry!
