Steam, vapor, and condensation in closed tanks
Hot liquids, boiler feed, and condensate tanks generate vapor and surface condensation that scatter ultrasonic echoes and fog optical sensors, while the level still has to be tracked continuously.
Confirm the site problem, the Volivue approach, and the expected operating benefit before final selection.
Vapor and condensation weaken ultrasonic echoes and coat sensor faces, causing dropouts and false level readings.
Use a Volivue FMCW radar transmitter whose microwave beam passes through vapor, with antenna and process seal selected for the temperature and condensation load.
Level stays continuous and stable through vapor and condensation, so pump control and inventory data remain trustworthy.
Vapor and condensation rule out sound and light, not microwaves
Boiler feed tanks, condensate receivers, and hot process vessels keep a layer of vapor above the liquid and a film of condensation on every cold surface, including instrument faces. Ultrasonic echoes scatter in the vapor column and optical sensors fog over, yet the level feeds pump protection and inventory and cannot simply drop out during peak steaming.
FMCW microwave radar passes through vapor that defeats sound and light, which is why this scenario sits squarely with a Volivue radar transmitter. The boundary runs the other way: a vented, cool, clean water tank is often served more economically by a Volivue ultrasonic level sensor, and very hot vessels move the selection to the high-temperature R30A variant with appropriate seals.
Sealed antennas, reviewed nozzles, and one-shift commissioning
Antenna choice is the core of the design: a sealed or lens-style antenna sheds condensate droplets, and the process seal is matched to the tank temperature and condensation load. The nozzle is reviewed for height and diameter, placed away from the fill stream, and checked so the dead zone clears the maximum level. Aiming keeps the beam off internal heating coils.
The transmitter delivers 4-20mA with HART as the default hand-off to PLC pump control, with Modbus available where the project needs it, and Bluetooth commissioning lets technicians review echo quality and set empty and full references without opening the housing in a hot, wet space. A single tank is typically instrumented and commissioned within a normal maintenance shift.
What to capture before instrumenting a steaming tank
- Record process temperature range, steaming cycles, and how heavy condensation gets on cold surfaces.
- Measure nozzle height and diameter, and confirm the dead zone clears the maximum fill level.
- Position the nozzle away from fill streams and heating coils that disturb the measured surface.
- Define output and alarm targets: 4-20mA, HART, and high and low trip points for pump protection.
Will condensation dripping from the antenna face distort the reading?
Sealed and lens-style antennas are shaped so condensate films drain instead of pooling, and FMCW processing tolerates a thin film far better than ultrasonic transducers tolerate fog. Heavy, continuous condensation is treated as a selection input: the review matches antenna style and mounting angle to your steaming pattern rather than ignoring it.
Could we just use an ultrasonic sensor on this tank?
If the tank is vented, cool, and largely vapor-free, an ultrasonic sensor is often the more economical choice and Volivue will say so. Once steaming, hot liquids, or persistent condensation enter the picture, ultrasonic echoes scatter and the radar transmitter becomes the option that keeps the level continuous.
Five checks that decide antenna, mounting, conversion, and output scope for the radar.
Collect tank drawings and geometry
Confirm tank height, diameter, shape, nozzle size, mounting position, dead zone, and internal obstacles before any range claim.
Review medium and process conditions
Medium name, vapor, foam, turbulence, corrosion, temperature, pressure, and hazardous area decide antenna, seal, and wetted material.
Select radar model and package
Choose range, antenna, wetted material, process connection, seal, protection class, and accessories from the reviewed conditions.
Map usable outputs
Define 4-20mA, HART, relay, optional RS485/Modbus, PLC, dashboard, alarm, trend, or volume fields so the signal is useful after installation.
Commission and validate
Check scaling, empty/full references, false echo suppression, tank conversion, alarm points, and trend behavior with site data.
Selection questions for engineers, procurement teams, and site maintenance.
When should I choose radar instead of ultrasonic?
Choose radar when vapor, foam, condensation, temperature swings, pressure, corrosion, long range, or high reliability requirements make ultrasonic echo unstable. For clean, vented, low-cost tanks, ultrasonic stays a good and more economical fit.
Does the transmitter measure weight?
No. It measures liquid level. Volume or percent fill is calculated from tank geometry or a strapping table; mass needs documented density assumptions.
Can radar handle foam and vapor?
The microwave beam passes through vapor and condensation, and echo filtering or a stilling well can stabilize foaming or turbulent surfaces. Severe foam is reviewed per application to confirm the antenna and mounting.
What media can it handle?
Fuel, lubricants, solvents, acids, chemicals, additives, condensate, and food-grade liquids, with antenna, seal, and wetted material confirmed by review.
Can it connect to PLC or SCADA?
Yes, the project scope can include 4-20mA, HART, relay, optional RS485/Modbus, gateway, dashboard, or API integration, with Bluetooth available for commissioning.
Do you support hazardous area or pressurized tank projects?
We can review hazardous-area, temperature, and pressure requirements, but no ATEX, IECEx, SIL, or local compliance claim is made without verified product data and documentation.
What information should we send first?
Send the tank drawing, medium name, height, nozzle details, temperature, pressure, vapor or foam condition, required outputs, and site conditions.
Send tank drawings, medium, temperature, pressure, and output target.
Share tank drawings, medium name, height, nozzle details, temperature, pressure, vapor or foam condition, output target, country or region, and hazardous-area need if any.