The Delta HLA – Foul is designed to detect high water levels within packaged pumping stations and sumps. The Delta HLA is an independent high water level alarm with an 85 dB audible alarm and LED status display on the front fascia.

It acts as a warning system in the event of:

  • power failure to the Delta HLA

  • a high water level state in the chamber/sump

  • a high water level state has been recorded

  • a service due

Key features

  • An internal battery ensures continuous protection in the event of mains power failure

  • Quick and simple installation

  • Robust and reliable high water alarm

  • Includes a sump float switch and counterweight

  • LED’s for visual status and warning

  • Mute and reset buttons

  • Three volt-free contacts for connection to external systems

  • Can be retrofitted

Technical specification

  • The Low Voltage Directive, EN61010:2010.

  • The EMC Directive EN55014:2006, A1 and EN55014-2:2015

Associated products

  • Delta Foul V3 Packaged Pumping Station

The Delta HLA provides a secondary line of protection in the event of mains power failure. Its internal battery ensures continued operation of the alarm until mains power is restored.

The Delta HLA is simple to install and offers three volt-free contacts for connection to external systems.

The Delta HLA operates via sump float switch. If the water level rises above the start point of the primary pump, the alarm float switch lifts until a point of contact is made internally. This signals to the panel that the water level is high and the panel goes into alarm.
When the level drops, the switch falls which resets the alarm.

The sump float switch is secured to the chamber’s integral float bracket by a cable gland and cable tie.

For areas where the Delta HLA may not be seen or heard, we recommend using the Delta HLA Plus.