European hazardous area ATEX approved sensors for liquid level measurement in intrinsically safe installations on petrochemical, pharmaceutical, landfill and sewage treatment sites.
Our ATEX approved liquid level sensors are engineered for demanding applications within hazardous areas, particularly Zone 0 and Zone 1 environments where flammable gases and vapors pose a constant explosion risk. These sensors achieve safety through intrinsic safety (Ex i) principles, limiting electrical and thermal energy to prevent ignition, and must be integrated with certified intrinsically safe barriers. Critical for industries like petrochemical, pharmaceutical, landfill operations, and sewage treatment, they provide reliable level measurement while ensuring compliance with stringent European safety directives for installations such as fuel storage, solvent handling, leachate monitoring, and digester gas environments.
LMP307 Submersible Level Transmitter - Submersible level transmitter for measuring liquid level with a 4-20mA current loop or a 0-10V voltage output plus optional ATEX approval for intrinsically safe use in hazardous areas in ranges from 1mH2O up to 250mH2O. The LMP307 is suitable for use on potable water with no leaching, and can be supplied with a drinking water certificate according to DVGW and KTW.
LMK458 Marine Approved Hydrostatic Level Transmitter - Marine approved level transmitter with 4-20mA output for measuring level of contents inside ship ballast, fuel, liquid cargo or wastewater tanks
LMK351 High Overpressure Flush Level Transmitter - Flush capacitive ceramic pressure sensor for measuring corrosive and viscous liquid level from levels 0.4 metres of water up to 200 mH2O. 
LMK331 Screw-In Ceramic Level Transmitter - Level pressure sensor with semi-flush ceramic diaphragm and stainless steel or PVDF wetted parts in ranges from 0-4 to 600mH2O gauge.
DPT200 Pressurised Tank Level Differential Pressure Transmitter - Pressurised tank liquid level differential pressure cell transmitter for process plant storage.
DMP331P Hygienic Flush Pressure Transmitter - Sanitary pressure sensor wth exposed diaphragm with no crevices for high temperatures up to 300 Degrees Celsius in ranges from 100mb up to 40 bar gauge or absolute
LMK382 Low Range IP68 Waste Water Level Transmitter - Submersible Low Range waste water level transmitter with intrinsically safe option for monitoring the level of sewage and effluent in water treatment plants.
DS200 Combined Hydrostatic Level Switch, Gauge and Sensor - Three in one hydrostatic level switch, digital level gauge and level sensor with level ranges from 1 mWG up to 600 mWG (3.3 to 1969 ftWG).
LMP 308 Removable Waterproof Cable Connection Water Level Sensor - Groundwater, tank & reservoir water level detachable submersible cable hydrostatic liquid level sensor for multiple municipal water level measurement locations.
DMK 458 Seawater Low Range Pressure Transmitter - Sea water corrosion resistant low range pressure transmitter for marine, ship and offshore engineering.
LMK 487 Submersible Ballast Tank and Draught Level Pressure Transmitter - A 22mm diameter titanium body seawater depth and level probe with a 4-20mA output with Lloyds and DNV-GL ship approval, for monitoring the quantity of ballast or the draft of a ship’s hull.
LMK307 Submersible Waste Water Level Sensor - Submersible waste water level sensor with optional intrinsic safety certification for monitoring the level of sewage and effluent in water treatment plants.
Find out more about ATEX Approved Liquid Level Sensors for Hazardous Areas to determine which product options and capabilities will best meet your application requirements.
ATEX approved liquid level sensors are specifically engineered for deployment in environments where the presence of flammable gases, vapors, or dusts creates a persistent risk of explosion. The ATEX certification signifies compliance with stringent European Union directives, ensuring these sensors are suitable for intrinsically safe installations. This intrinsic safety (Ex i) protection concept is paramount, as it limits the electrical and thermal energy within the sensors and associated wiring to levels below that which could ignite a specific hazardous atmospheric mixture. This is achieved through careful design that restricts voltage, current, and power, even under fault conditions.
When selecting these sensors, a critical consideration is the designated hazardous area classification, such as Zone 0 or Zone 1. Zone 0 environments are those where an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is present continuously or for long periods or frequently. Zone 1 areas are locations where such an explosive atmosphere is likely to occur in normal operation occasionally. Therefore, liquid level sensors intended for Zone 0 must meet the most rigorous safety requirements, often involving multiple redundant safety features. The choice of sensor must align precisely with the zoning and the specific gas group (e.g., IIA, IIB, IIC) and temperature class (T1-T6) of the hazardous materials present.
The integration of these ATEX certified liquid level sensors with compatible, certified intrinsically safe (I.S.) barriers is a non-negotiable aspect of system design. These barriers, typically Zener barriers or galvanic isolators, are installed in the safe area and regulate the energy supplied to the field-mounted sensor in the hazardous area. This ensures that even if a fault occurs within the control system or power supply in the safe area, the energy entering the hazardous zone remains below ignition levels. Incorrect barrier selection or installation can compromise the entire safety concept, negating the sensor’s ATEX approval.
Applications for these specialized liquid level sensors are diverse and critical. In petrochemical facilities, they are essential for monitoring levels in storage tanks containing volatile fuels, solvents, or chemical feedstocks, preventing overfills and ensuring process stability. Pharmaceutical manufacturing often involves the use of flammable solvents in reactors and mixing vessels, where precise level control under ATEX conditions is vital for both safety and product quality. Landfill sites utilize these sensors for monitoring leachate levels, where the presence of methane (a highly flammable gas) necessitates intrinsically safe instrumentation. Similarly, in sewage treatment plants, particularly in anaerobic digesters or confined spaces where sewer gases can accumulate, ATEX approved level sensors provide crucial monitoring to prevent hazardous situations and optimize process control. The robust construction and material compatibility of these sensors are also key, ensuring they can withstand corrosive substances often found in these industrial environments while maintaining their safety integrity.