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Electronic Water Sensor



Electronic sensor for the detection of free water in aviation fuels. The AFGUARD® sensor is qualified for use as an alternative to Chemical Water Detectors (CWD). The AFGUARD® is considered fail-safe and hazardous area (ATEX and IECEx) approved. The sensor system complies with the ISO 13849 standard.

  • Qualified to specification EI 1598 2nd Edition
  • Accepted by Joint Inspection Group (JIG)
  • Recommended by IATA Fuel Quality Pool (IFQP)
  • Required in conjunction with EI 1599 Dirt Defence filter elements
  • Recommended for use downstream of all filtration technologies to verify filter performance (PerformanceBasedFilterLife™)

Eliminate uncertainties by installing AFGUARD® and be free to choose from the alternative filtration technologies as they become qualified and endorsed by JIG following field trial.


  • Constant monitoring of aviation fuel quality

  • Cost-effective (cost savings on CWD)

  • High-precision measurement

  • Maximum accuracy through reliable sensor technology and traceable recertification

Technical Data

  • Measurement range: 0 - 50 ppm
  • Accuracy of the measurement range: +/- 3 ppm
  • Linear analogue output signal: 4 to 20 mA
  • Contact load DC: 16 - 30 V DC
  • Hazardous area approvals (ATEX and IECEX): II 1 / 2G Ex ib [ia] IIB T4 II 1 / 2G Ex ia IIB T4Ex ia / ib IIB T4 Ga / GbEx ia IIB T4 Ga / GbII 3G Ex ic IIB TEx ic IIB T4 Gc
  • Protection class: IP 67
  • Operating temperature range: -30 to + 60 ° C (-22 ° F to 140 ° F)
  • Storage temperature range: -30 °C to + 70 °C (-22 °F to 158 °F)
  • Energy consumption: Max. 750 mW
  • Maximum operating pressure: 16 bar

AFGUARD® EWS System Principle

AFGUARD® EWS System Installation

With the kind support of ACTEUS Group (www.acteusfueling.com). Copyright ACTEUS Group 2020.


Reduce redundancy and complexity. Increase operational efficiency.

The AFGUARD-ready® symbol indicates the ability of systems to provide a signal transfer between the EI 1598 AFGUARD® sensor and a logic controller. The requirements to receive input from a sensor qualified to EI 1598 are derived from JIG Technical Bulletin No. 130 with regard to alert, alarm and data storage function.

Many international manufacturers already offer AFGUARD-ready®-compatible logic controllers.

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