Guided Radar Level Transmitters: TDR Technology Explained

What is TDR Technology?

Time Domain Reflectometry (TDR) or guided radar level transmitters send electromagnetic pulses along a probe. When the pulse reaches the product surface, it reflects back. The time difference determines the level with high precision.

Advantages Over Other Technologies

• Unaffected by foam, vapor, or dust
• Works in extreme temperatures and pressures
• No calibration required for different products
• Suitable for interface measurement
• Low maintenance requirements

Probe Types

Single rod probes suit most applications. Coaxial probes excel in low dielectric media. Flexible cable probes work in tall tanks. Twin rod probes handle turbulent conditions effectively.

Application Examples

TDR transmitters are ideal for chemical storage tanks, oil-water separation, food ingredient silos, and pharmaceutical vessels. They provide reliable measurement where other technologies fail.

Selection Guidelines

Consider process temperature, pressure, product dielectric constant, and tank height. Proper probe length and material selection ensure optimal performance and longevity.