Continuous 0–100% Level
Provides complete real-time level information across the entire vessel span, not just high/low alarm points.
Level Instruments
Capacitance Level Transmitter
Continuous Level Measurement Using Capacitance Sensing Technology
Continuous Level Monitoring for Compatible Tanks & Vessels
The FlowDo Capacitance Level Transmitter is engineered for continuous liquid and bulk material level measurement in compatible industrial vessels. It accurately measures changes in electrical capacitance as process material rises or falls along the sensing probe and converts the signal into a calibrated 4–20 mA industrial process output.
CAPACITANCE
Technology
CONTINUOUS LEVEL
Measurement
PROBE BASED
Sensing
TANKS & VESSELS
Application
Product Overview
Reliable Capacitance-Based Level Measurement
Precision solid-state level monitoring engineered for industrial storage tanks and process vessels.
The FlowDo Capacitance Level Transmitter operates on the established electrical capacitance principle. In this sensing arrangement, the insulated or bare sensing rod acts as one plate of a capacitor, while the vessel wall (or a reference ground pipe) forms the opposing plate. The process medium acts as the dielectric insulator between them.
As the liquid level rises, it displaces the air or vapor phase with a medium of higher dielectric constant, increasing the total electrical capacitance linearly with height. High-frequency electronics convert this capacitance change into an isolated 4–20 mA DC current loop signal for remote SCADA, PLC, and indicator interfaces.
Key Engineering Highlights
- Solid-state sensing with no mechanical moving parts or float wear
- Custom probe lengths from 0.3 meters to 3.0 meters (rod) and up to 10+ meters (cable)
- PTFE / PFA probe insulation options for conductive and corrosive liquids
- Standard 2-wire 4–20 mA current loop output with high noise immunity
- Rugged cast aluminum IP65/IP66 weatherproof electronics enclosure
Verified catalogue data
Technical Specifications
Verified technical parameters for FlowDo Capacitance Level Transmitters.
Brand / Manufacturer
FlowDo Process Instruments
Product Name
FlowDo Capacitance Level Transmitter
Measurement Type
Continuous Liquid / Material Level (0–100%)
Operating Principle
Electrical RF / Capacitance Sensing
Measuring Range (Span)
0.3 m to 3.0 m (Rigid Rod Probe); up to 10 m (Flexible Rope / Cable)
Output Signal
Standard 4–20 mA DC (2-Wire Current Loop)
Power Supply
18–32 V DC (Nominal 24 V DC loop powered)
Accuracy
±0.5% of Full Scale (under calibrated dielectric conditions)
Probe Wetted Material
SS316 Stainless Steel (Bare or fully PTFE/PFA insulated)
Process Connection
1" / 1.5" / 2" BSP/NPT Male Thread or ANSI/BS Flanged
Operating Temperature
-20°C to +80°C (Standard); up to +150°C (High Temperature with cooling fin)
Operating Pressure
Atmospheric up to 10 bar (depending on connection & model)
Enclosure Rating
Die-cast Aluminum IP65 / Weatherproof
Product design
Key Features
Engineered for rugged industrial environments and reliable continuous level monitoring.
Solid-State Reliability
No moving floats, linkages, or mechanical seals to wear out, stick, or require frequent field maintenance.
PTFE/PFA Insulation
Heavy-duty fluoropolymer probe insulation allows reliable operation in conductive, acidic, and chemical liquids.
Custom Probe Lengths
Available in rigid rod configurations from 0.3 m to 3.0 m, and flexible rope probes for deep vessels up to 10 m.
Standard 4–20 mA Output
2-wire loop powered 4–20 mA output provides straightforward connectivity with PLCs, DCS, and indicators.
Threaded & Flanged Mounts
Versatile mounting options including standard 1" to 2" BSP/NPT threads and ANSI/DIN industrial flanges.
Industries and processes
Applications
Continuous level monitoring across diverse industrial tanks, vessels, and processing facilities.
Chemical & Acid Storage
Continuous level monitoring in chemical dosing tanks, acid reservoirs, and alkaline storage vessels with PTFE probe insulation.
Water & Wastewater Treatment
Raw water tanks, treated water reservoirs, effluent holding basins, and chemical dosing systems in ETP/STP plants.
Diesel & Fuel Oil Tanks
Day tanks, generator fuel reservoirs, transformer oil storage, and lubricating oil systems with stable dielectric properties.
Industrial Utility Vessels
Feedwater tanks, condensate collection tanks, cooling tower makeup sumps, and utility process vessels.
Machine & Skid Integration
Compact installation in OEM machinery, hydraulic power packs, cleaning skids, and packaged industrial filtration units.
Food & Beverage Tanks
Edible oil storage, non-sticky liquid ingredient tanks, and CIP liquid monitoring with stainless steel wetted parts.
System Integration
From Tank Measurement to Process Monitoring
Seamless signal transmission from field capacitance probe to plant automation architecture.
Capacitance Level Transmitter
Field Sensing Probe
↓
Continuous Level Value
Calibrated Dielectric Response
↓
4–20 mA DC Output
Linear Industrial Current Loop
↓
Local Indicator
FlowDo Level / Process Indicator
PLC / Controller
Pump Automation & Alarm Logic
↓
SCADA & Plant Monitoring
Real-time telemetry, automated pump interlocks & analytics
Level Technology Overview
Choose the Right Continuous Level Technology
Comparison of primary FlowDo continuous level measurement instruments.
Capacitance Transmitter
- Principle
- Electrical capacitance change
- Installation
- Top mounted probe
- Process Contact
- Probe in medium contact
- Best Suited
- Compatible liquids and vessels with stable dielectric properties.
Radar Level Transmitter
- Principle
- Electromagnetic radar / microwave
- Installation
- Tank top (Flanged / Horn antenna)
- Process Contact
- Non-contact for applicable models
- Best Suited
- Challenging process vessels, storage tanks, and non-contact continuous monitoring.
Ultrasonic Transmitter
- Principle
- Sound-wave / acoustic echo
- Installation
- Tank top
- Process Contact
- Non-contact
- Best Suited
- Compatible open/closed tanks where ultrasonic conditions are suitable.
Hydrostatic Transmitter
- Principle
- Liquid hydrostatic pressure
- Installation
- Submerged / pressure sensing
- Process Contact
- Sensor exposed to liquid
- Best Suited
- Deep sumps, reservoirs, borewells, and open storage tanks.
Technology selection should consider medium characteristics, tank geometry, installation access, measurement range, temperature, pressure, atmosphere and required accuracy.
Product Range
Available Level Transmitter Configurations
FlowDo level instruments can be selected according to measurement range, process connection, material compatibility, output and installation requirements.
Catalogue 1 of 2
Related Instrumentation
Related Level Instruments
Explore complementary FlowDo instruments for level measurement, indication and process monitoring.
Hydrostatic Level Transmitter
Model FLD-HLT Submersible hydrostatic level transmitter for continuous liquid-level measurement in tanks, reservoirs, sumps and open channels.
View details & specs →
Ultrasonic Level Transmitter
Non-contact ultrasonic transmitter for continuous liquid level measurement in tanks, vessels and industrial water applications.
View details & specs →
Side Mounted Level Transmitter
Side-mounted continuous liquid level transmitter for accessible side process connections in industrial tanks and vessels.
View details & specs →
Radar Level Transmitter
Radar-based transmitter for continuous non-contact level measurement in compatible industrial tanks and vessels.
View details & specs →Frequently Asked Questions
Capacitance Level Transmitter FAQs
Common technical questions regarding capacitance continuous level measurement.
What is a capacitance level transmitter?
It measures changes in electrical capacitance associated with changing process level and converts them into continuous level information.
Is it a continuous measurement device?
Yes. A transmitter provides continuous level information (0–100%), unlike a level switch that detects a single high or low point.
How does capacitance level measurement work?
The sensing probe and vessel wall form an electrical capacitance circuit; electronics process capacitance variations as the medium rises or falls.
Why are dielectric properties important?
Capacitance measurement is influenced by the medium’s electrical properties, which should be considered during selection and calibration.
Can it connect to a PLC or SCADA?
Compatible FlowDo configurations provide standard 4–20 mA process outputs suitable for direct PLC, DCS, and SCADA integration.
Can it be used for chemical tanks?
Suitability depends on the compatibility of the probe material, insulation (PTFE/PFA), and wetted components with the chemical medium.
Does probe build-up affect measurement?
Heavy coating can influence the electrical field around the probe; build-up prone applications should be reviewed during selection.
Which technology is best: capacitance, radar, or ultrasonic?
Capacitance, radar, ultrasonic, and hydrostatic each suit different media, tank geometries, conditions, and installation requirements.
Need Help Selecting a Level Transmitter?
Configure the Right Capacitance Level Solution for Your Tank
Share your tank dimensions, process medium, measurement range, temperature, pressure, process connection and output requirements with FlowDo to identify a suitable configuration.
For faster selection, provide: Tank Height • Measured Medium • Range • Temperature • Pressure • Connection • Probe Requirement • Required Output