Float switch with ATEX approval

UniEx.SS_Float switch with ATEX appovalFloat switches with ATEX approval are suitable for the use in explosive media and atmospheres according to Directive 2014/34/EU.
Float switches are passive devices. They do not require a power supply. All standard ATEX devices are offered for a temperature range of -20°C to +105°C in the medium, or -20°C to 70°C above process connection. Our high temperature devices are suitable for an operating temperature of -40°C to +180°C. UniEx.SS float switches are manufactured according to customer requirements and can therefore be individually configured and used for a wide range of applications.

Simply configure and request UniEx.SS now without obligation or arrange a consultation appointment!

Float switch in combination with temperature switch/sensor
Optionally, the UniEx.SS series devices can be equipped with temperature switches or sensors. Both temperature switches, which open or close at a desired temperature, and temperature sensors, such as PT100/PT1000, can be combined with the float switch.

 Data sheet UniEx.SS 105°

 Data sheet UniEx.SS 180°


 Temperature range from -20°C to 105°CTemperature range from -40°C to 180°C
  ATEX certification

BVS 21 ATEX ZQS/E377 Production Quality Assurance Notification
BVS 15 ATEX E 086 X EU-Type Examination Certificate

  Applied standards EN IEC 60079-0:2018 General requirements
EN 60079-11:2012 Intrinsic Safety “i”
EN 60079-26:2015 Equipment protection level (EPL) Ga

  ATEX marking

CE 0158 2000px EX Logo II 1/2G Ex ia IIC T3...T6 Ga/Gb
CE 0158 2000px EX Logo II 1/- D Ex ia IIIC T* °C Da
CE 0158 2000px EX Logo II 1 D Ex ia IIIC T* °C Da

  Electrical connection   
e. g. aluminium housing, stainless steel housing, plug-type connector, sheathed cable
for details please see data sheet UniEx.SS 105°
aluminium housing
For details please see  data sheet UniEx.SS 180°
  Process connection
e. g.  thread, flange
for details please see data sheet UniEx.SS 105°

  Tube ø 12 mm, material stainless steel 1.4571
further materials on demand

  Tube length
according to specification, max. 3000mm | max. 3000 mm

  Float ø 45 x 52 mm cylinder, stainless steel 1.4571
ø 52 mm bullet, stainless steel 1.4571

  Reed contacts max. 6x n.o. contact / n.c. contact or change-over contact

  Switching capacity

30V / 100 mA – Ex barrier mandatory!
To be operated in intrinsically safe circuits - type of protection Ex i!

  Pressure max. 40 bar

  Protection rating
IP 65

IP 66
  Operating temperature

-20°C to 105°C in medium
-20°C to 70°C above process connection

-40°C to 180°C

Optional: temperature switch / temperature  sensor

  Temperature switch Bi-Metal
  Switching function
normally closed / normally open contact
± 5°C, smaller tolerances on demand | reset-temperature = Temp.-switching point - 30°C ± 15°C
  Number of contacts
max. 2 temperature switches
  Switching capacity
30V / 100 mA – Ex barrier mandatory!


  Temperature sensor platinum resistor PT100 / PT1000 according DIN EN 60751, class B
  Nominal resistance
PT100: 100 Ohm | PT1000: 1000 Ohm
  Temperature coefficient:
  Tolerance class DIN EN 60751, class B
  Self-heating PT100: 0,4 K/mW | PT1000: 0,2 K/mW
  Long-term stability
  after 1000h at 150°C:
R0 Drift < 0,06 %

For further technical features and details as well as the ordering code, please see data sheet UniEx.SS 105° or  data sheet UniEx.SS 180°.

  • Level Control in Hazardous Areas
    ATEX float switches are used to monitor the liquid level in containers and tanks in environments with potentially explosive atmospheres. They enable precise level detection and ensure that the liquid level remains within specified limits to minimize potential safety risks.
  • Pump Control and Protection
    In hazardous areas, ATEX float switches take on the task of controlling and protecting pumps. They monitor the liquid level and activate the pump when necessary to ensure an adequate liquid supply. In case of a too-low liquid level, they can deactivate the pump to prevent dry running and associated hazards.

  • Alarm Signaling
    ATEX float switches also serve as alarm devices in hazardous environments. They can trigger a visual or audible alarm when the liquid level reaches a critical value or when a system malfunction occurs. This enables a quick response and measures to prevent accidents or damage.

  • Process Monitoring
    ATEX float switches play a crucial role in monitoring processes in hazardous areas. They ensure that the required liquid levels are maintained in the equipment to ensure safe and efficient operation. By automatically controlling the liquid flow, they contribute to optimizing process workflows.

  • Liquid Shutdown in Case of Danger
    ATEX float switches can also serve as a safety precaution by shutting off the liquid supply to a facility or system in hazardous areas when a danger is detected. This may be necessary, for example, in the case of a gas leak or another critical situation to ensure safety and prevent the spread of an explosion.

  • The float switch may only be operated with certified intrinsically safe circuits with the permissible maximum values.
  • The device must be included in the periodic pressure/safety test of the container
  • The float switch must be electrically connected to the equipotential bonding system of the plant.
  • Chemical Industry
    In the chemical industry, ATEX float switches are indispensable for monitoring the level of chemicals in tanks, storage tanks, and containers. They ensure accurate detection of liquids such as solvents, acids, and other chemicals to detect potential risks early and maintain safety standards.
  • Oil and Gas Industry
    In the demanding oil and gas industry, ATEX float switches are used to control the level of oil, fuels, and other liquids in tanks, pipelines, and storage facilities. With their precise monitoring, they help prevent leaks and overfills, thus ensuring the safety of the facilities.
  • Petrochemical Industry
    In the petrochemical industry, ATEX float switches play a crucial role in monitoring liquids such as crude oil, chemicals, and gases in tanks, storage tanks, and processing plants. They enable precise level detection to minimize accidents and security risks.
  • Mining Industry
    In the mining industry, ATEX float switches are essential for monitoring liquids such as water, slurry, and chemicals in settling ponds, slurry tanks, and other facilities. Their reliable measurement contributes to the safety of workers and the prevention of environmental pollution.
  • Energy Generation
    In the energy generation sector, whether in power plants or renewable energy facilities, ATEX float switches are essential components for monitoring coolants, oils, and other liquids in tanks and equipment. They ensure precise level detection to maximize the efficiency and safety of the energy generation process.
  • Tanks for Flammable Liquids
    ATEX float switches are the ideal choice for monitoring tanks containing flammable liquids. They reliably detect the level of liquids such as fuels, oils, and chemicals, providing timely warnings of overfill or low liquid levels to minimize potential security risks.
  • Pressure Vessels
    ATEX float switches play a crucial role in pressure vessels and perform specific tasks to ensure the safety and functionality of these vessels in hazardous environments. Here are some of the functions of ATEX float switches in pressure vessels:
    Level Control
    One of the main tasks of ATEX float switches in pressure vessels is to monitor the liquid level. They detect the level of the liquid and signal when a certain threshold is reached. This allows for control of the level and prevention of overfill or too-low liquid levels. This is crucial to ensure the proper functioning of the pressure vessel and minimize potential safety risks.
    Alarm Functions
    ATEX float switches serve as a safety precaution by triggering alarms when a critical condition in the pressure vessel is detected. This could be, for example, a too-low liquid level. The alarm can take various forms, such as a visual display, an audible alarm, or the triggering of a stop signal. This allows operators to respond to potential issues in a timely manner and take appropriate measures to ensure the safety of the pressure vessel.
    Safety Shutdown
    In certain situations, ATEX float switches can also initiate a safety shutdown of the pressure vessel. For example, if a critical condition is detected, they can close the supply valve or deactivate the system to eliminate a potential hazard.
    Process Control
    ATEX float switches also enable the automatic control of processes in pressure vessels. They can be connected to control systems to regulate the flow of liquids. This ensures controlled operation of the pressure vessel and optimizes process efficiency.

Get an individual consultation!

Vertriebsleitung Matthias Kuhn

Together we will find a solution that precisely suits you and your needs.
Call me for your individual consultation or request a callback!

Matthias Kuhn
phone: +49 (0) 73 89-90 92-22
mail: mkuhn(at)engler-msr.de

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