Monitoring severe liquid volumes in deep dams, open reservoirs, municipal water towers, and open-pit mine dewatering sumps presents a major budgeting and mechanical hurdle. At depths approaching 100 metres, the structural cost of specialised cabling skyrockets, while the transmitter itself must continuously withstand massive hydrostatic pressures of up to 10 Bar in open, untreated water.
The Novus WL420 Deep-Range series is engineered explicitly to control project costs in deep, open water environments. By utilising a rugged, cost-effective 26.5 mm industrial footprint, it significantly lowers overall hardware expenses compared to specialized slim-line sensors. Its robust construction combines a 304 Stainless Steel shell with a high-performance 316L Stainless Steel diaphragm, structurally optimized to deliver accurate, drift-free level telemetry under intense deep-water stress.
Optimised Project Costs: At extreme depths, the physical cable length dominates your invoice. The WL420’s economical, highly resilient body design keeps total hardware costs down, making large-scale municipal and industrial tenders far more competitive.
Zero-Loss Signal Loops: Transmitting a standard 4-20 mA current loop ensures that your depth data travels through up to 100 metres} of vertical cable and hundreds of additional surface meters with absolutely zero signal drop or voltage degradation.
Heavy Strain-Relief Core: Hanging up to a 100m vertical column of heavy-jacketed cable creates enormous structural tension. The WL420’s premium polyurethane (PUR) cable is equipped with an integrated strain-relief wire, preventing the copper conductors from stretching or breaking under their own weight.
Red Wire: Power Supply VCC (+12 to 36 vDC)
Blue Wire: Output Current Signal (4-20 mA Loop Return)
Internal Red Tube: Atmospheric Vent Tube (Must remain completely unobstructed and dry inside your terminal junction box)
Novus also offers the premium, slimline WL320 for specialised deployments, the WL420 remains the undisputed industry workhorse and the most logical choice for standard 1m to 2.5m tank configurations.
By utilising a wider 26.5 mm footprint, the WL420 houses a larger, robust internal sensor element that delivers exceptional long-term stability and high repeatability without the premium price tag of a miniature borehole probe. It strikes the perfect balance for industrial utility tanks: you get the exact same 316L stainless steel measuring diaphragm as the higher-end models, wrapped in a rugged 304 housing that is fully optimised for standard water, oils, and neutral chemical solutions.
At the bottom of the product list are options for protecting the vent tube from water ingress and still leaving the sensor able to actively compensate for the current atmospheric pressure.
Applications
Frequently Asked Questions
The sensors listed below all come with standard vented cable lengths. Longer cables can be achieve being using the compensation box and adding standard cable.
WL420 Submersible Hydrostatic Level Transmitter. Depth Range 25mH2O. 2-Wire Loop Powered 4-20mA Output with a 12-36vDC Power Supply. 40m Polyurethane (PUR) Cable with Ventilation Tube. Over-Pressure 200% FS, Burst Pressure 500% FS. Stainless Steel Sensor with 105mm Body Length and 26.5mm Diameter.
WL420 Submersible Hydrostatic Level Transmitter. Depth Range 40mH2O. 2-Wire Loop Powered 4-20mA Output with a 12-36vDC Power Supply. 50m Polyurethane (PUR) Cable with Ventilation Tube. Over-Pressure 200% FS, Burst Pressure 500% FS. Stainless Steel Sensor with 105mm Body Length and 26.5mm Diameter.
WL420 Submersible Hydrostatic Level Transmitter. Depth Range 60mH2O. 2-Wire Loop Powered 4-20mA Output with a 12-36vDC Power Supply. 80m Polyurethane (PUR) Cable with Ventilation Tube. Over-Pressure 200% FS, Burst Pressure 500% FS. Stainless Steel Sensor with 105mm Body Length and 26.5mm Diameter.
WL420 Submersible Hydrostatic Level Transmitter. Depth Range 100mH2O. 2-Wire Loop Powered 4-20mA Output with a 12-36vDC Power Supply. 120m Polyurethane (PUR) Cable with Ventilation Tube. Over-Pressure 200% FS, Burst Pressure 500% FS. Stainless Steel Sensor with 105mm Body Length and 26.5mm Diameter.
Accurate hydrostatic measurement relies entirely on balancing the sensor against local atmospheric pressure changes via an internal cable vent tube. To prevent moisture, humidity, and dirt from entering this delicate tube and damaging your transmitter, we highly recommend installing a specialised Vented Compensation Box. This enclosure allows the sensor to breathe freely while utilising a replaceable desiccant to seal out the elements, ensuring long-term system accuracy and preventing premature sensor failure.
Small ABS Compensation Box. Provides a venting point for a depth sensor close to the monitoring location, whilst offering a connection for a longer cable back to monitoring equipment. Enclosure is IP67 rated to prevent water ingress but not air tight.
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