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SQ4 leak sensor

Safety liquid leak sensor, type 4.

Safety liquid leak sensor, type 4

SQ4 series safety leak sensors detect leaks and thereby curb danger resulting from them. The two-part design, consisting of the sensor and the mounting bracket, simplifies installation. The sensor itself incorporates two-stage detection: a detection unit at the front of the sensor issues a warning if it comes into contact with liquid, whereas if the detection unit in the center of the sensor becomes immersed, the leak is considered critical and the sensor initiates an emergency stop. To provide utmost flexibility, a chemically resistant version is also available. Up to 4 safety liquid leak sensors can be connected to the SQ4-C11 controller.


  • Two-stage detection (mild leak, critical leak)
  • Type 4, PLe, SIL3 (with SQ4-C11 controller)
  • Chemically resistant housing (PFA)
  • Operation also possible without controller


  • Mounting bracket
  • Controller
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SQ4 leak sensor
  • Leakage monitoring during wafer production


Name File Type Size Date Language
PDF Brochure Capteurs Catalog, Shortform 32.5 MB 13.09.2021 French
PDF Catálogo Resumen Sensores Data sheet 30.6 MB 28.04.2021 Spanish
PDF Data sheet SQ4 Data sheet 2.7 MB English
PDF Programma Sensori Catalog, Shortform 2.6 MB 11.01.2021 Italian
Raccolta Applicazioni Sensori Data sheet 24.2 KB 20.12.2018 Italian
ZIP SQ4 series, 2D Data CAD 208.5 KB
ZIP SQ4 series, 3D Data CAD 721.8 KB
PDF SQ4-A Instruction Manual, MJE-SQ4A Manual 590.1 KB 16.12.2021 English
PDF SQ4-A Series Controller for Safety Liquid Leakage Sensor Instruction Manual Manual 1.3 MB 01.06.2011 English
PDF SQ4-A Série Contrôleur pour capteur de fuite de liquide de sécurité manuel d'instructions Manual 585.4 KB 01.06.2011 French
PDF SQ4-C11 Instruction Manual, MJE-SQ4C11 Manual 704.6 KB 16.12.2021 English
PDF Sensor Selection Guide for Packaging Industry Catalog 14.7 MB 12.07.2022 English
PDF Sensori Fotoelettrici Guida tecnica Data sheet, Technical information 1.9 MB 01.05.2006 Italian
PDF Senzory - Zkrácená verze Catalog, Shortform 10.1 MB 28.01.2013 Czech
PDF Short Form Sensors for Factory Automation Catalog, Shortform 32.7 MB 08.07.2021 English
PDF Série SQ4-A Captuer de fuite de liquide de sécurité manuel d'instructions Manual 273.7 KB 01.07.2011 French
PDF Übersicht Sensoren Catalog, Shortform 28 MB 05.05.2022 German