Delta high level alarms provide independent warning of high water levels in sump chambers and packaged pump stations. They activate an audible and visual alert if water rises above the normal operating level, typically due to pump failure or power issues. All models include internal battery backup and are designed for use with Delta sump pumps and packaged stations in Type C cavity drainage waterproofing systems.

Delta HLA – Groundwater (DMS 190-1)

  • For groundwater, surface water, and clean water applications.

Delta HLA – Foul (DMS 191-1)

  • For foul and grey water applications.

Delta HLA – 800 Series (DMS 191-1)

  • Specifically designed for Delta 800 Series packaged pump stations.

Delta HLA Remote Alert (DMS 530)

  • Wi-Fi module for remote notifications.

Key Specifications

Delta HLA – Groundwater (DMS 190-1)

  • Mini float switch with protective shroud

  • 85 dB audible alarm

  • LED status display

  • Internal battery backup

  • Mute/reset buttons

  • Three volt-free contacts

Delta HLA – Foul (DMS 191-1)

  • Float switch with counterweight

  • 85 dB audible alarm

  • LED status display

  • Internal battery backup

  • Mute/reset buttons

  • Three volt-free contacts

Delta HLA – 800 Series

  • Designed for integration with Delta 800 Series chambers

  • Same core features as Foul model (float switch, 85 dB alarm, LED display, battery backup, volt-free contacts)

Delta HLA Remote Alert (DMS 530)

  • Wi-Fi enabled email notifications

  • Monitors high water, power failure, and service status

  • 2-year battery life

  • Works with standard HLA units

Range Comparison

Model

Code

Application

Audible Alarm

Battery Backup

Volt-free Contacts

Special Feature

HLA Groundwater

DMS 190-1

Ground/Surface

85 dB

Yes

3

Mini float + shroud

HLA Foul

DMS 191-1

Foul/Grey

85 dB

Yes

3

Float + counterweight

HLA 800 Series

DMS 191-1

800 Series stations

85 dB

Yes

3

For larger packaged stations

HLA Remote Alert

DMS 530

Any

—

2 years

Monitors existing

Wi-Fi email alerts

Standards & Compliance

All models comply with:

  • BS 8102:2022 (Type C drained protection)

  • NBS R18 (Clause 310)

  • Low Voltage Directive

  • EMC Directive

System Design Guidance

  • Selection: Match alarm type to water category and chamber type (standard vs 800 Series).

  • Integration: Retrofits easily to existing systems. Use volt-free contacts for linking to control panels or remote systems.

  • Best Practice: BS 8102:2022 recommends high level alarms in all occupied below-ground spaces, combined with dual pumps and battery backup.