Drop It In. Read It Right. Every Time.
A submersible hydrostatic level transmitter operates on a straightforward principle; static pressure at the submerged sensor is directly proportional to the height of liquid above it. The probe is lowered to the base of a tank, well, or reservoir, where it continuously converts hydrostatic pressure into a 4-20 mA or digital output signal for real-time level monitoring.
The hydrostatic level transmitter range covers piezoresistive and ceramic sensing variants in SS316L, titanium, and PVDF housings, with vented cables for atmospheric compensation and measuring ranges suited to shallow tanks through deep boreholes. Output options include 4-20 mA, 0-10V, and RS485 Modbus.
Dutco Tennant LLC supplies process instrumentation across the UAE and GCC, sourcing the right hydrostatic submersible level transmitter for water treatment, oil and gas, chemical storage, and environmental monitoring applications.
Accurate, Continuous Level Data With Zero Complexity
- No external mounting hardware — the probe is simply lowered into the liquid for immediate measurement
- A vented vent tube integrated into the cable cancels barometric pressure fluctuations, ensuring only true hydrostatic head is reported
- Corrosion-resistant SS316L, titanium, and PVDF housings handle freshwater, seawater, acids, alkalis, and slurries without material degradation
- IP68 ingress protection rating guarantees full submersion reliability across deep tanks, sumps, boreholes, and open channels
- No moving parts result in long service life and minimal maintenance requirements across continuous operation
Built-In Capabilities That Deliver Reliable Readings
- Piezoresistive Sensing Element: Diffused silicon chip converts hydrostatic pressure to an electrical signal with high linearity and low hysteresis across the full measurement range
- Atmospheric Compensation: Integrated vent tube within the cable referencing atmospheric pressure eliminates measurement errors caused by barometric changes or elevation differences
- Flush Diaphragm Tip: PTFE-coated flush diaphragm variants resist clogging in slurries, sludge, and viscous media where standard nose-cone designs would block
- Overvoltage Protection: Built-in surge suppression shields the sensing circuit from electrical spikes caused by lightning or power transients in remote outdoor installations
- Multi-Output Compatibility: 4-20 mA, RS485 Modbus, and 0-10V signal options allow direct integration with PLC, DCS, SCADA, and data-logger systems
Types
Standard Vented Cable Submersible Transmitters
The submersible hydrostatic level transmitter with vented cable is the most widely used configuration, suited for open tanks, sumps, lift stations, and groundwater wells.
- SS316L housing with polyurethane or Teflon cable jacket for corrosion and abrasion resistance
- Vent tube within the cable automatically compensates for atmospheric pressure changes
- Loop-powered 4-20 mA output for compatibility with standard control panels and data loggers
Ceramic Diaphragm Submersible Transmitters
Ceramic sensing cell variants deliver excellent chemical resistance and mechanical stability for water, wastewater, and ship ballast tank applications.
- Alumina ceramic diaphragm withstands scaling, fouling, and mild chemical attack without surface degradation
- No oil fill in the sensing cell eliminates contamination risk in potable water and food-grade applications
- Preferred configuration for municipal water treatment and groundwater pump control systems
Titanium Housing Submersible Transmitters
Titanium construction provides superior corrosion resistance for seawater, brackish water, marine environments, and aggressive chemical storage.
- Titanium body withstands chloride-induced corrosion that degrades standard stainless steel over time
- Suited to ship ballast monitoring, coastal groundwater boreholes, and offshore water injection systems
- Available with DNV and marine certifications for vessel and offshore platform installations
PVDF and Polymer Housing Submersible Transmitters
PVDF, PTFE, and PP housing variants handle highly corrosive acids, alkalis, and solvents where metallic construction is not compatible with the process medium.
- Fully non-metallic wetted parts for compatibility with hydrochloric acid, sodium hydroxide, and organic solvents
- Available with integral weight to keep the sensor anchored at the tank base for consistent readings
- Suited to chemical storage tanks, leachate pits, and industrial effluent holding tanks
Miniature and Narrow Bore Submersible Transmitters
Compact designs with diameters as small as 10 mm are built for boreholes, piezometers, and narrow-diameter monitoring wells in environmental and geotechnical applications.
- Narrow profile allows deployment in bore holes and groundwater monitoring points with restricted diameters
- Long vented cable runs with strain relief accommodate deep well installations without signal degradation
- RS485 Modbus and data-logger outputs support remote and solar-powered telemetry stations
Standout Features & Benefits
Robust All-Environment Construction
- SS316L, titanium, and PVDF housing options cover the full spectrum from clean water to aggressive chemical media
- Polyurethane and Teflon cable jackets resist moisture ingress, abrasion, and chemical attack across extended submersion periods
- IP68-rated assemblies remain fully operational at continuous submersion depths beyond installation requirements
Simple Drop-In Installation
- No process shutdown or complex mechanical mounting required — the probe is lowered and suspended at the desired depth
- Custom cable lengths accommodate installations from shallow storage tanks to boreholes exceeding 100 metres
- Lightweight, compact profile fits easily into restricted access points without specialised tools or equipment
Unaffected by Surface Conditions
- Unlike ultrasonic or radar transmitters, measurement accuracy is unaffected by foam, vapour, turbulence, or condensation at the liquid surface
- Density-based hydrostatic measurement remains stable regardless of changes in surface reflectivity or media colour
- Consistent signal output maintained in liquids with agitation, aeration, or floating debris
Wide Signal and Protocol Compatibility
- 4-20 mA output is immune to electrical noise across long cable runs to remote control panels
- RS485 Modbus digital output enables advanced data integration into SCADA and building management systems
- HART protocol variants allow remote configuration, diagnostics, and status monitoring without on-site access
Application Areas
Water & Wastewater Treatment
- Continuous level monitoring in raw water intake tanks, clarifiers, sedimentation basins, and treated water reservoirs
- Lift station and wet well management to automate pump duty cycles and prevent overflow events
- Flow measurement over weirs and in open channels using hydrostatic head calculation
Groundwater & Environmental Monitoring
- Borehole and piezometer level monitoring for aquifer management, dewatering control, and groundwater contamination tracking
- River, canal, and flood monitoring using narrow submersible probes in remote, solar-powered telemetry systems
- Leachate pit and landfill monitoring with chemically resistant PVDF housing variants
Oil, Gas & Chemical Storage
- Fuel oil, diesel, and lubricant storage tank level monitoring in terminals, depots, and process plants
- Chemical storage vessel level in tanks containing acids, alkalis, and solvents using non-metallic housing variants
- Produced water and condensate pit level tracking in upstream oil and gas operations
Marine, Offshore & Infrastructure
- Ship ballast tank monitoring using titanium housing units certified for marine environments
- Coastal and offshore groundwater borehole level measurement with marine-grade materials
- Cooling water tower basin and HVAC plant room sump level management in large commercial and industrial facilities
