Blockage & Overflow Alarms
Level alarms that warn as a sewer surcharges, and Blockage Watch in FlowSense that finds a blockage weeks before it overflows.
At a glance
- Radar level to ± 5 mmLIDoTT Alarm measures up to 8.4 m
- Sydney Water panel providerFor sewer flow and level instrumentation
- SMS, email and websiteThree alarm states, and a daily heartbeat
- Zone 0ATEX and IECEx, the most hazardous classification
Blockages and surcharges give warning if something is watching. EDS deploys level monitoring through sewer networks that alerts crews to rising wastewater depth, so utilities can react quickly to a blockage, or a surcharge caused by a sewer collapse, before it becomes a spill.
Detectronic’s LIDoTT Alarm puts a radar level sensor, battery, modem and aerial into one Zone 0 certified device, suited to deployment throughout sewer networks and in domestic or lateral sewers. EDS supplies and installs it across Australia and runs it in our own monitoring fleet, and is a Sydney Water panel provider for sewer flow and level instrumentation.
Where flow meters are already installed, the data does the watching too. A steady rise in depth with no rain to explain it points to a developing blockage or sediment build-up, often long before field crews would report it.
How it works
Level alarms for every chamber
Three Detectronic radar instruments, all ATEX and IECEx certified for Zone 0, the most hazardous classification.
DetectronicLIDoTT AlarmPulsed coherent radar measuring up to 8.4 m to ± 5 mm, with three alarm states and a battery life of up to seven years, in a submersible, self-cleaning enclosure.
DetectronicAlarm2Radar level from 0 to 20 m with no deadband, accurate to ± 5 mm at 20 m. High and low, rate of change and profile alarms.
DetectronicLIDoTT RRadar and pressure level together, up to 17 m in total with zero deadband, for continuous monitoring through surcharge.
Blockage Watch in FlowSense
Where flow meters are installed, FlowSense reads the dry weather record and finds a developing blockage weeks before it overflows. It is included on every site, and shows that a line is blocking rather than exactly where; a level alarm in the chamber warns as the depth rises.
- Eight blockage signatures
Six of them from level alone. The strongest, conveyance at matched depth, uses velocity as well.
- Scored, not just flagged
Each case is scored: watch from 35, warning from 55 and critical from 75. A case closes itself once the signature goes.
- A likely cause and an action
Silt or grease, a sudden obstruction, a downstream restriction or increased load, with a suggested response: desilt, CCTV, inspect below the meter, or no action.
- Tested against your history
A backtest against your own overflow register shows how much warning it would have given.
What it helps you catch
- Blockages in main, domestic and lateral sewers
- Surcharges caused by sewer collapses
- Sediment build-up, cleared before the next storm
- Partial obstructions, sags and displaced joints
- Rising risk of a wet weather overflow
Raise the water. Watch the alarm.
An illustration of how a LIDoTT Alarm behaves. Thresholds are set on site during installation.
LIDoTT Alarm specifications and datasheetTalk to the people who measure it.
Tell us about your network, site or project. A real person from our team will come back to you.