Next generation high resolution level monitoring

LIDoTT Water Level Monitoring Sensor

Not an ordinary water level monitoring sensor

  • Ultrasonic level measurement (above water)
  • Narrow beam angle
  • No deadband effect
  • Pressure sensor depth measurement (under water)
  • Integral temperature sensor
  • Modbus communications
  • ATEX and IECEx Zone 0 certified

LIDoTT® is a next generation water level monitoring sensor. It integrates ultrasonic level, pressure depth and temperature sensors into one compact device. LIDoTT® delivers high-quality data throughout normal dry-weather operating and either wet-weather or blockage induced surcharge conditions.

LIDoTT® is a unique, UK and Worldwide, patent-pending design. On rising and falling water levels, LIDoTT® seamlessly transitions from ultrasonic level measurement to pressure depth measurement and back again – delivering continuous data.

Widespread deployment

As a water level monitoring sensor, LIDoTT® is cost efficient and therefore ideal for widespread deployment. It can be positioned in sewer networks, in domestic sewer manholes and throughout other water courses.

designed for convenience

LIDoTT® is simple to install and ultra-low maintenance by design. It requires no external atmospheric breather for its pressure-sensor.

The enclosure is moulded from a carefully selected, resilient, naturally self-cleaning plastic polymer and is submersible. LIDoTT® is safe to use in all environments being
ATEX and IECEx certified Zone 0.

continuous measurement

When the sewer network is stressed during storm weather events or by blockages, the LIDoTT® water level monitoring sensor automatically switches sensor mode from ultrasonic (level) to pressure (depth) as the liquid level rises, seamlessly delivering high-quality network management data. This transition is transparent to the external datalogging device which needs only a single recording channel.


Three sensors in one

Ultrasonic level sensor

The LIDoTT® sensor reliably detects subtle changes in “normal” operating conditions – accurately delivering, for example, small silt-induced variations in Depth of flow.

“In Air” Temperature sensor

Primarily used to calibrate distance measurement for changes in air density, temperature can optionally be delivered to the datalogger as a measured parameter.

Pressure sensor

With its 10m H2O operating range, the pressure sensor deals with exceptional Depth measurement. LIDoTT® delivers seamless transition from Level measurement – using its Ultrasonic sensor, to Depth measurement – using its Pressure sensor. The pressure-sensor is activated and measures rising depth before the Ultrasonic sensor blanking distance (dead-band) is reached.

how it works

As the liquid level rises, the ultrasonic sensor is in charge. Once the level reaches the bottom of the pressure sensor, pressure reading starts and a calibration sequence begins.

By the time the level enters the ultrasonic dead-band, the calibration sequence is complete and the calibrated pressure sensor takes over, delivering continuous, accurate depth data.


data communications

The LIDoTT® Sensor communicates using a number of serial protocols including Modbus and will connect to many compatible data loggers.

  • Real time monitoring helps you better understand your sewer network
  • Automatic sensor switching enables continuous delivery of high quality network management data.
  • Data logging device needs only a single depth recording channel.
  • Designed to be compatible with many manufacturers’ data loggers.


product specification

Type: Piezo-ceramic, temperature-compensated
Range: 0.000 – 1.500m
Accuracy: +/- 2mm

Type: High Precision CMOS Temperature device

Type: Isolated Silicon Diaphragm
Range: 0-10.00m
Accuracy: ±0.2% FS

Operating temperature: -20°C to +60°C.
Protection: IP68/NEMA6P.
Connectors: IP68 Mil – Spec.
Dimensions: 200mm(h) x 125mm(d) x 115mm(w)


ATEX Zone 0 certified CML 20ATEX2039X
IECEx Zone 0 certified IECEx CML 20.0019X
II 1 G, Ex ia IIB T4 Ga. Ta= -20°C to +60°C

UK and Worldwide patents pending



MMS D049 – LIDoTT Sensor


project applications

Contact Us


+44 (0)1282 449124

Regent St
Whitewalls Industrial Estate


Start your enquiry

If you have a question please start by filling out the form below:

  • Search ...