Welcome to the Eletta Educational Series!
Hello {First Name},
Selecting the right flow monitor can feel overwhelming with so many technologies to choose from. Factors such as accuracy, cost, delivery time, wetted materials, pressure loss, and area classification all play a role.
In this first edition of our Eletta Educational Series, we’ll walk you through the most commonly used flow technologies and explain why differential pressure (DP) flow monitoring remains the preferred choice in demanding industrial applications.
Step 1: Understand the Application
Before selecting a flow monitor, it’s essential to clearly define the application. Collecting the right information ensures accurate sizing, selection, and long-term performance.
- Media (water, oil, air, steam, or other)
- Density & Viscosity (if not water or air)
- Measuring Range (min, nominal, & max)
- Pipe Size
- Fitting Type (threaded or flanged)
- Mounting Orientation
- Operating Temperature & Pressure (min, nominal, & max)
- Flow Parameter to be Monitored (switch, indication, and/or transmitter)
- Indoor or Outdoor Installation
- Area Classification Required
Pro Tip: The more information you collect upfront, the more accurate and reliable your flow monitor selection will be.
Step 2: Understand the Flow Technologies
There are several flow monitoring technologies available, each with unique strengths, limitations, and ideal applications. Here’s a quick overview of the most commonly used types:
1) Differential Pressure (DP)
- How it works: Measures pressure drop across an orifice, nozzle, or venturi.
- Strengths: Widely accepted industry standard; no moving parts; predictable long-term performance.
- Best for: Cooling water loops, lubrication circuits, high temperatures, steam, and general industrial service.
- Notes: Extremely versatile across to pipe sizes, media types, operating conditions, output options
2) Variable Area
- How it works: Floating element (float) in conical tube indicates flow.
- Strengths: Simple, reliable, direct visual indication.
- Best for: Low-pressure drop requirements.
- Notes: Some moving parts; very sensitive to viscosity changes.
3) Magnetic Inductive
- How it works: Faraday’s Law conductive liquid induces voltage proportional to velocity.
- Strengths: No obstruction, no moving parts, great for dirty fluids.
- Best for: Conductive liquids (water, acids, slurries).
- Notes: Requires conductivity above minimum threshold; not for gases.
4) Turbine
- How it works: Flow spins a turbine rotor; speed ∝ velocity.
- Strengths: Good accuracy, repeatability; relatively low cost.
- Best for: Clean, low-viscosity liquids.
- Notes: Moving parts may wear; sensitive to flow profile and particulates.
5) Coriolis
- How it works: Measures mass flow directly via inertial effects in vibrating tubes.
- Strengths: True mass flow, high accuracy, handles multiple fluid types.
- Best for: Custody transfer, batching, custody-sensitive applications.
- Notes: Costlier; heavier; requires straight runs; sensitive to vibration.
6) Vortex Shedding
- How it works: Flow past bluff body creates vortices; frequency ∝ velocity.
- Strengths: Good for steam/condensate, gases, saturated steam.
- Best for: Steam applications, compressed air, gases.
- Notes: Requires minimum Reynolds number; pressure drop can be higher; not ideal for dirty fluids.
Why Differential Pressure Measurement Continues to Lead
While newer technologies offer specialized advantages, differential pressure (DP) remains the most versatile and broadly applicable method across industrial environments.
Key Benefits of DP Flow Measurement:
- Proven performance in harsh industrial applications and environments
- No moving parts to wear, stick, or drift
- Established standards (ISO, ASME)
- Compatibility with a wide range of transmitters and control systems
- Predictable behavior over decades of service
In applications where reliability and long-term stability are paramount, DP remains the default choice for many engineers.
Why Eletta is your Best DP Flow Monitoring Option
With over 78 years dedicated exclusively to flow monitoring, Eletta has built its reputation on one core principle: durable, dependable differential pressure flow monitoring for demanding industrial environments.
Proven Experience
For nearly eight decades, Eletta has refined mechanical DP technology to deliver long-term reliability in mission-critical applications.
Industry-Leading Durability
Eletta manufactures some of the most robust mechanical DP flow monitors available — engineered for continuous operation in harsh industrial conditions.
Trusted in Critical Industries
Eletta flow monitors are installed in:
- Power generation facilities — including nuclear plants
- Steel manufacturing operations
- Hydropower stations
- Cyclotron and radioactive environments
- Medical and pharmaceutical processes
- These industries demand stability, repeatability, and zero tolerance for failure.
No Moving Parts
Eletta’s mechanical DP design eliminates rotating components that can wear, stick, or drift, ideal for high-vibration, dirty, or demanding applications.
Handles All Media
Differential pressure technology allows Eletta monitors to measure:
- Liquids
- Gases
- Steam
- Across a wide range of pressures and temperatures.
Scalable Across Pipe Sizes
From very small lines to extremely large pipe diameters, Eletta’s DP technology adapts reliably without fundamental design changes.
Simple, Robust Mechanical Design with Modern Output Options
Eletta combines rugged mechanical DP sensing with modern electrical outputs and integration capabilities, bridging traditional reliability with contemporary control systems.
Long-Term Cost Advantage
In many industrial environments, simplicity equals reliability. Mechanical DP monitoring often delivers:
- Lower maintenance requirements
- Reduced downtime risk
- Long service life
- Lower total cost of ownership