ELGWR 40 Guided Wave Radar

LGWR-40 Guided Wave Radar (TDR) Level TransmitterFeatures

• Unmatched price-to-performance ratio
• Precise continuous level measurement + reliable point level detection in one device
• Fully modular probe design — probes are interchangeable without special tools or welding
• Complete galvanic isolation of electronics from tank/sensor potential
  (eliminates electrochemical corrosion issues)
• Highly robust measurement using advanced 4-wire design
• Innovative signal processing with disturbance suppression
• Suitable for challenging liquid applications and difficult tank geometries

Description

The Electronet ELGWR-40 is a 4-wire TDR (Time Domain Reflectometry) guided wave radar level transmitter designed for continuous level measurement and point level detection in liquids. It supports both single-rod and coaxial probes, enabling flexible use across a wide variety of applications.

The device emits low-energy, high-frequency electromagnetic pulses along the inserted probe. When these pulses strike the liquid surface, part of the signal is reflected back. The transmitter measures the time difference between emitted and reflected pulses to calculate the level.
The ELGWR-40 provides both analog output for continuous level and switching outputs for point detection.

Measurement Principle

• TDR-based high-frequency pulse reflection
• Probe immersed in liquid conducts the EM signal
• Reflected signal is analyzed for precise level calculation
• Outputs available:
  • Continuous analog level (4–20 mA)
  • Configurable switching outputs

Application Area

The ELGWR-40 supports reliable level measurement in nearly all liquids, regardless of:

• Density
• Conductivity
• Pressure
• Temperature
• Vapors
• Turbulence

It is ideal for:

• Storage tanks and process vessels
• Narrow nozzles and tall chambers
• Bypass chambers and stilling wells
• Liquids with low dielectric constant (oils, hydrocarbons)

The device offers exceptional reliability even near internal tank obstructions or in complex tank geometries.

Sensor Components & Probe Types

The ELGWR-40 consists of three modular elements:

1. Housing

• Contains electronics and I/O terminals
• No contact with tank atmosphere

2. Feed-Through Assembly

• Metal bushing secures the device to tank
• Guides HF measurement signal into tank
• Universal design — fits all probe types

3. Probe

Two modular probe options:

Single-Rod Probe

• Wide application range
• Slightly larger signal detection radius
• Suitable for bypass chambers / stilling wells
• Better for general-purpose industrial liquids

Coaxial Probe

• Fully contained HF signal
• Immune to external disturbances
• Ideal for low dielectric liquids (oils/hydrocarbons)
• Suitable for “drop-in anywhere” installation
• Not suitable for sticky, viscous, fibrous, slurry, crystallizing or particle-containing liquids

The modular design allows switching between probe types simply by adding or removing the coaxial outer tube.

ELGWR-40 Summary

• High accuracy guided wave radar
• Suitable for harsh industrial environments
• Flexible modular probe architecture
• Reliable measurement even with difficult tank geometries
• Ideal for low-reflectivity media