Leak Alert 73/75/80

Compact Sensor for dust measurement

LEAK ALERT 73/75/80 are compact sensors for electrodynamic filter damage and leakage monitoring in industrial filter systems.
The instrument is used in an industrial environment in order to carry out continuous trend measurement on clear gas sides after dust filters. Leak Alert can also be used for pure filter break detection.

With the option of calibrating the device and providing a real volume signal (mg/m³), this compact system can in principle cover all measurement tasks, which do not have to meet official requirements.


  • 3 status-LEDs
  • Internal display and internal set up keys for service purposes
  • Flue-gas temperature up to 250 °C (400 °C option)
  • For applications up to 95 %, non-condensing,
  • Relative humidity (with optional insulated rod)
  • Compact sensor with isolated 4 ... 20 mA-output
  • For aggressive flue-gas (with optional insulated rod)
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  • Technical Specifications
  • Applications
  • Operating Principle
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  • Ambient Air Temperature: -25 ... +55 °C
  • Stack Gas Temperature: 250 °C standard or 400 °C option
  • Stack Connection: 1½ BSP
  • Enclosure Rating: IP 65
  • Power Requirements:100 ... 24 V AC or 24 V DC
  • Outputs(Standard): 4 ... 20 mA (500 Ω)
  •                                   Warning alarm relay (SPST 1 A @ 24 V DC)
  •                                   Emission alarm relay (SPST 1 A @ 24 V DC)
  • Optional:                    RS 232 ModBus
  •                                   Rs 485 ModBus - enables use of PC-ME Dust Tools PC software suite
  • Inputs:   Plant stop signal (output to zero when plant is off) marker for start of bag cleaning sequence
  • External LEDs x3): 1 Power / sensor OK
  •                                  2 Warning and limit alarm
  •                                  3 Self check status (options)
  • User Set Up: 4 digit display and set up buttons (external keypad and display option)
  • Cable Entries: 3 x M20 gland/conduit entries
  • Air purge Connection: Optional , ¼ BSP connection to instrument air line

The Leak Alert series are used to monitor emissions from the following types of processes:

  • Quarrying (eg Rotary Dryers, Roller Mills)
  • Carbon Black filter plant
  • HEPA filters (eg pharmaceutical / biomedical plant)
  • Coal Mill / Cement Mill/ Cement Kiln arrestment plant
  • Humid applications eg Dryers, Calcinators
  • Wood cutting & chipping plant

LEAK ALERT uses the electrodynamic measurement principle.

If the dust to be measured is constant, then the generated measuring signal is proportional to the dust concentration, even if there are dust deposits on the measuring probe. Experience shows that the measuring method provides very exact results with little required maintenance.

The technology outperforms conventional DC triboelectric systems and alternative AC systems by extending the velocity range over which the instrument has no cross sensitivity to changing velocity, and is unaffected by contamination of the sensor rod eliminating concerns of signal drift.