Mini-Float Switch with ATEX approval for the process industry and industrial applications

UniEx.M mini float switch with ATEX approvalMini float switches with ATEX approval are suitable for use in explosive media and environments according to Directive 2014/34/EU. Mini float switches are passive devices and 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. UniEx.M mini 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.M now without obligation or arrange a consultation appointment!

Mini float switch in combination with temperature switch/sensor
Optionally, we equip the UniEx.M series devices with temperature switches/sensors. Both temperature switches, which open or close at a desired temperature, and temperature sensors, such as PT100/PT1000, can be combined with the mini-float switch.


  data sheet UniEx.M series


  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

aluminium housing, stainless steel housing, plug-type connector, sheathed cable
for details please see data sheet UniEx.M

  Process connection

thread, flange | For details please see data sheet UniEx.M


ø 8 mm, material stainless steel 1.4571 | further materials on demand

  Tube length

according to specification | max. 1500 mm


ø 27 x 31 mm cylinder, material stainless steel 1.4571

  Reed contacts

max. 3 normally open/ normally closed contacts or change-over contacts (without temperature switch or PT100/PT1000)

  Switching capacity

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


max. 6 bar

  Protection rating

IP 65

  Operating temperature

-20°C to 105°C in medium, -20°C to 70°C above mounting

  Temperature switch

in combination with max. 2 switching contacts n.o. / n.c. contact or change over contact

  PT100 / PT1000

in combination with max. 2 switching contacts n.o. / n.c. contact or change over contact

Optional: temperature switch / temperature  sensor

  Temperature switch          
  Switching function
± 5 °C, smaller tolerances on demand | reset-temperature = Temp.-switching point - 30°C ± 15 °C
  Number of contacts
max. 2 temperature switches
  Switching capacity
30 V / 100 mA
  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
PT100: 0,4 K/mW | PT1000: 0,2 K/mW
  Long-term stability
  after 1000h at 150°C    
R0 < 0,06 %

For further technical features and details as well as the ordering code, please see data sheet UniEx.M.

  • Level measurement in many liquid media, e. g. water, oil, fuel
  • Large field of application due to the proven functional principle:
    Monitoring of processes, predetermined levels as well as pumps and level controls
  • Chemical industry, petrochemical industry, mechanical engineering, shipbuilding industry, offshore facilities, energy plants and others
  • areas of application are, for example, barrier pressure vessels, agitators or printing machines
  • Temperature range from -20°C to 105°C in medium, -20°C to 70°C above mounting
  • High reliability and long life span
  • The mini 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 mini float switch must be electrically connected to the equipotential bonding system of the plan

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)

Configure and request UniEx.M

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Engler Steuer- und Messtechnik GmbH & Co. KG
Lange Straße 151
D-72535 Heroldstatt

Telefon +49 7389 / 9092-0
Fax +49 7389 / 9092-40

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