Cable Guided Wave Radar Level Gauge for Wide-Range, Anti-Interference Level Measurement

Tall tanks and deep vessels need a probe that reaches the bottom without the weight and handling problems of a rigid rod. The cable guided wave radar level gauge combines a flexible cable probe with guided wave technology to deliver wide-range measurement up to 30 meters, <0.1% accuracy and strong anti-interference for oil storage, silos and water treatment.

Why Do You Need a Cable Guided Wave Radar Level Gauge?

Large oil storage tanks, coal powder silos, transformer oil tanks and sewage basins share a common requirement: reliable level measurement over significant depths in conditions that disturb other instruments. A cable guided wave radar meets this need because its flexible probe can extend far into tall vessels, where a rigid rod would be impractical and a free-space radar would fight foam, vapor and internal structures. The guided wave principle concentrates the signal along the cable, so the measurement is not significantly affected by changes in medium density or temperature, and it resists interference from tank walls, agitators and nearby equipment. With wide range, <0.1% accuracy and 1mm resolution, it delivers the dependable data needed for large-scale inventory, process control and environmental monitoring, in a design that is practical to transport and install even at extreme probe lengths.

Working Principle: Guided Microwave Pulses Along a Flexible Cable

The gauge transmits high-frequency microwave pulses along a cable probe that extends from the top of the vessel to the bottom. When a pulse reaches the product surface, the dielectric change creates a reflection that returns along the cable, and the electronics convert the round-trip time into an accurate level value. Because the signal energy is concentrated around the cable, the measurement is stable and strong, with accuracy better than 0.1%, resolution of 1mm and repeatability of ±3mm. The guided signal is not significantly affected by changes in medium density or temperature, and it is immune to the interference that disturbs free-space instruments, including foam, vapor, vessel internals and electromagnetic noise. The cable probe's flexibility allows ranges far beyond those of rod probes, making the gauge suitable for very tall tanks and deep vessels, while the probe weight is kept manageable for installation.

Structural Advantages of the Cable Guided Wave Gauge

• Flexible cable probe: reaches tall vessels, easy to install.
• Wide measuring range: up to 30 m for tall tanks and silos.
• <0.1% accuracy: precise measurement over full range.
• 1mm resolution: fine level detail for control and inventory.
• Strong anti-interference: immune to foam, vapor and internals.
• Media-independent: unaffected by density or temperature changes.
• ±3mm repeatability: consistent, reliable readings.
• Multi-industry design: petrochemical, power, food, water, mining.

Pain Point Analysis: 2 Challenging Working Conditions

Application Cases

Product Advantages

• Flexible cable probe for tall vessels and deep tanks
• Wide measuring range up to 30 m
• <0.1% accuracy and 1mm resolution
• Strong anti-interference from foam, vapor and internals
• Unaffected by density or temperature changes
• ±3mm repeatability for consistent readings
• Suitable for oil, powders, slurries and water
• Practical installation at extreme probe lengths

Technical Parameters

SEO FAQ

Q1: How long can a cable guided wave probe be?

Cable probes are typically available for measuring ranges up to about 30 meters, with some designs supporting even longer lengths for special applications. Unlike rigid rod probes, which are limited to roughly 6 meters by their weight and handling, the flexible cable can be coiled for transport and unrolled during installation, so long probes remain practical to ship and mount. The actual maximum depends on the specific model and application, and the probe must be anchored at the bottom of the vessel to maintain tension and stability. For very tall oil tanks, deep silos and large basins, a cable guided wave radar is the standard solution. Specify your vessel height when ordering to confirm the required probe length.

Q2: Why is the measurement not affected by density and temperature changes?

Guided wave radar measures the time for a microwave pulse to travel along the probe and reflect at the product surface. The propagation speed of the guided signal is essentially constant regardless of the medium's density, viscosity or temperature, because the signal travels along the probe structure rather than through the medium itself. Changes in density, such as oil warming up or sludge settling, therefore do not shift the measurement, unlike hydrostatic methods which depend on density, or ultrasonic methods whose sound speed varies with temperature and vapor composition. This media independence gives the cable guided wave gauge exceptional stability across changing process conditions and product batches, making it a reliable choice for storage, process and environmental applications.

Q3: What makes the anti-interference performance so strong?

The anti-interference strength comes from the guided wave principle itself. The microwave signal is confined around the cable probe instead of radiating freely through the vessel, so it cannot be confused by reflections from tank walls, beams, ladders, agitators or nearby equipment, which are the main sources of false echoes in free-space radar. Foam on the surface and vapor in the atmosphere also have minimal effect, because the signal does not need to travel through them to reach the surface. The result is a clean, unambiguous echo that the electronics evaluate reliably. This makes the cable guided wave gauge suitable for vessels with complex internal structures and difficult surface conditions where other instruments produce erratic readings.

Q4: What industries and media is this gauge suitable for?

The gauge is designed for broad industrial service. In petrochemical plants it measures large oil storage tanks, raw material tanks and process vessels; in power and energy it monitors coal powder silos, ash silos and transformer oil tanks; in food processing it measures slurries and granular materials with its non-polluting, easy-to-clean design; in water treatment it monitors sewage tanks, sludge tanks and basins; and in building materials and metallurgy it measures cement and mineral powder silos. The combination of wide range, accuracy and interference immunity makes it a versatile choice wherever liquids, slurries or solids must be measured reliably over significant depths.

Q5: What support and customization do you offer?

As the manufacturer, we provide direct technical support including probe length selection, anchoring requirements, configuration and installation guidance. Customization options include cable length, process connection, output protocol, materials for corrosive service, labeling and packaging, plus OEM and ODM programs. Every gauge is factory-calibrated and tested before shipment, and our engineers can review your vessel dimensions and medium to confirm the correct cable configuration. Contact us with your tank details and measurement requirements for a tailored recommendation and quotation.

Why Choose Our Cable Guided Wave Radar Level Gauge?

Depth and reliability define this gauge. The cable guided wave radar reaches up to 30 meters into tall oil tanks, silos and basins, delivering <0.1% accuracy, 1mm resolution and ±3mm repeatability with a signal that foam, vapor and vessel internals cannot disturb. Its media-independent measurement stays stable through density and temperature changes, and the flexible cable makes extreme probe lengths practical to install. As the manufacturer, you receive factory calibration, application-matched probe configuration and direct engineering support. When the tank is deep and the measurement must be dependable, choose the cable guided wave radar that goes all the way down.