BDT Blocked Sewer Alarm
Manufactured by Radio Data Networks Limited
Product Buying Options
Product Capacity: 1 to 5,000 pcm
Minimum Order Quantity: 1
Additional Sales Information: The BDT Blocked Sewer Alarm is the UK's most popular sewer and drainage alarm and has now clocked up 15-years of service and is available with either a 10 or 20-year plus battery life. Many units are reaching 15-years in service on a single battery
Product Description
BDT Blocked Sewer and Sewer Flooding Alarm
The UK’s Leading Sewer & Drainage Alarm – 15 Years Proven in the Field
The BDT Blocked Sewer Alarm is the most trusted British-manufactured sewer and drainage alarm on the market. With over 15 years of proven service, it is available with 10-year or 20+ year battery life and is fully compatible with BMS, SCADA systems, and our IoT+ Dashboard.
Who Uses BDT?
Utilities – Water & Wastewater
Railways – Track flooding & culvert monitoring
Drainage Contractors
Local Authorities
Healthcare (including the NHS)
Hotels & Hospitality
Schools & Education
Offices & Commercial Buildings
Heavy Industry
Food Production, Agriculture & Farming
Domestic & Residential
Why Monitoring Matters
Sewers and drains block for many reasons: collapses, tree root ingress, FOG (fats, oils, grease) build-up, wet wipes, and more. Blockages in critical locations require 24/7 monitoring—especially where kitchens, public toilets, and baby-change facilities are present.
Early warning is essential:
Prevent spills and contamination
Protect public health and reputation
Plan maintenance outside business hours
Minimise disruption to customers
Industry-Proven Technology
Designed and manufactured in Britain, the BDT is an award-winning, robust monitoring device for sewer and drain applications.
Installed discreetly beneath existing manhole covers
Wireless for quick, disruption-free installation
No cables or complex setup required
Proven alternative to ultrasonic sensors, consuming just 1/50,000th of the energy
How It Works
The Bulk Dielectric Transducer (BDT) technology:
Has no moving parts to clog with sewage or get tangled up
Can often be installed without confined-space entry
Delivers data wirelessly every 2.5 seconds
Achieves up to 10 years battery life (20+ option available)
Supports drive-by or fixed network monitoring
Integrates with SCADA, BMS, gateways, or cellular/satellite systems
Flood Alarm Applications
The BDT is also widely used as a flood alarm, offering advantages over ultrasonics:
Immune to debris, webs, or obstructions
Self-testing – reports positively even when covered
Long-range communication up to 25 km via booter repeater
Satellite and cellular connectivity available via iridium booster repeater
Typical Areas of Use
Sewer blockage detection
Wet well high alarms
Surcharge monitoring
Storm drain monitoring
Industrial & commercial sewer alarms
Basement flooding protection
Community flood alarms
Key Features
15+ years proven service life
Measurement range: 0.3m to 4.5m (10m optional)
IP68 – fully submersible
Injection-moulded HDPE transducer housing
Real-time data at 2.5 or 30 second intervals
10 or 20+ year battery life
Zero programming or software setup required
Surface installation – no confined-space entry
ATEX Zone 2 certified
Licence-free radio: EN-300-220, RED compliant
✅ Reliable
✅ Low-maintenance
✅ Proven in the field since 2010
The BDT Blocked Sewer Alarm remains the industry standard for monitoring, protecting infrastructure, and preventing costly damage.
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