Deltapilot FMB70 Series
Hydrostatic Level Measurement Technology
Submersible pressure transmitters for reliable level measurement in tanks, wells, and open basins unaffected by foam, vapor, or surface conditions
Deltapilot FMB70
±0.1% AccuracySubmersible hydrostatic level transmitter for water and wastewater
Key Features:
- Ceramic sensor for long-term stability
- IP68 submersible rating
- Integrated lightning protection
- Marine-grade 316L stainless steel
Specifications:
- Measuring Range:
- Up to 200 m H₂O (20 bar)
- Temperature Range:
- -40°C to +80°C
- Cable Length:
- Up to 1000 meters
- Protection Rating:
- IP68 continuous submersion
Deltapilot FMB70Z
±0.1% AccuracyAdvanced hydrostatic transmitter with digital communication
Key Features:
- HART communication for remote configuration
- Density compensation capability
- Titanium option for seawater
- Extended temperature range available
Specifications:
- Special Versions:
- Up to 600 m depth
- Accuracy:
- ±0.1% of calibrated span
- Long-term Stability:
- ±0.1% per year
- Communication:
- 4-20mA HART
Proven Applications
Simple, reliable level measurement for challenging conditions
Water & Wastewater
Reliable level measurement in basins, tanks, and lift stations
Deep Wells
Groundwater monitoring with cable lengths to 1000 meters
Tank Monitoring
Unaffected by foam, vapor, or agitation in storage tanks
Open Channel Flow
Level measurement for flow calculation in flumes and weirs
Technology Comparison
Hydrostatic vs. non-contact level measurement
| Feature | Hydrostatic FMB70 | Radar/Ultrasonic |
|---|---|---|
| Foam/Vapor Effect | No effect | Signal loss/errors |
| Surface Agitation | No effect | Measurement noise |
| Installation | Simple - drop in | Precise mounting required |
| Minimum Tank Size | Any size | Beam angle limitations |
| Density Changes | Requires compensation | No effect |
| Cost | Lower | Higher |
| Maintenance | Minimal | Sensor cleaning needed |
Hydrostatic Advantages
Why hydrostatic measurement excels in challenging conditions
- Unaffected by foam, vapor, or surface turbulence unlike radar/ultrasonic
- Simple installation - just drop into tank or well
- Ceramic sensor provides exceptional long-term stability
- IP68 rating for permanent submersion in harsh environments
- Built-in lightning protection for outdoor installations
- Density compensation available for varying liquid properties
Frequently Asked Questions
Common questions about hydrostatic level measurement
What is hydrostatic level measurement and how does it work?
Hydrostatic level measurement uses pressure sensors to measure liquid column weight. The FMB70 measures pressure at tank bottom proportional to liquid height (P = ρgh). Unlike radar or ultrasonic, it's unaffected by foam, vapor, or surface conditions.
How do I compensate for liquid density changes?
FMB70 offers multiple density compensation methods: manual entry for fixed density, temperature compensation using density tables, or continuous measurement with secondary sensor. The transmitter calculates actual level using: Level = Pressure/(Density × Gravity).
Can hydrostatic transmitters measure interface levels?
Yes, FMB70 can measure interface between two liquids with differential pressure technique. Install two transmitters: one at interface zone, one at bottom. The pressure difference indicates interface position if density difference >100 kg/m³.
What's the maximum depth FMB70 can measure?
FMB70 measures depths to 200 meters water column (20 bar) standard, with special versions to 600 meters. Cable length available to 1000 meters for deep wells. The ceramic sensor maintains accuracy over entire range.
How do I install FMB70 in tanks with agitation?
For agitated tanks, install FMB70 in stilling well or side-mounted standpipe to isolate from turbulence. Mount away from agitator discharge. The hydrostatic principle naturally averages pressure variations.
Is FMB70 suitable for outdoor water/wastewater applications?
FMB70 is specifically designed for water/wastewater with IP68 submersible rating, marine-grade 316L construction, lightning protection built-in, and wide temperature range. Proven in millions of installations worldwide.
How do I prevent cable damage in FMB70 installations?
Protect FMB70 cable through proper cable selection (PUR or FEP jacket), strain relief at suspension point, protective conduit in traffic areas, and slack loop for thermal expansion. The integral cable design eliminates connection failures.
What are the advantages of ceramic sensors in FMB70?
FMB70's ceramic sensor provides exceptional stability (±0.1% per year), universal chemical compatibility, no oil fill to leak, excellent overload protection (40x), and no hydrogen permeation. This reliability reduces maintenance frequency.