EM4000

Magnetic Crawler Corrosion Thickness Measurement System

Suitable for plates, bars, tubes, austenitic stainless steel, high-temperature pipelines, and the detection of wall thickness and coatings in pressure vessels.

Feature Overview

• No scaffolding required—no need to sand or apply anti-corrosion coatings, and no coupling agents are needed. The remote control system enables rapid detection of high-altitude wall thickness corrosion, making it suitable for conducting tests on conductive materials such as carbon steel, cast steel, and alloy steel.
• No need to polish the workpiece surface, remove the anti-corrosion coating or rust from the surface, or apply a coupling agent.
• Measurement of non-perpendicularity (transducer/probe relative to the normal of the test object) up to ±25° allows for relaxed verticality requirements after probe placement.
• Utilizing an expert intelligent algorithm, it features three thickness measurement modes: automatic mode, single-gate manual mode (single-peak method for measurement), and dual-gate manual mode (peak-to-peak method for measurement). This significantly reduces the influence of human error and simplifies the operational steps.
• Equipped with an automatic high-temperature sound velocity compensation and correction function, the probe features a built-in sensor that automatically triggers an alarm when the probe temperature exceeds the preset threshold.
• Wireless operation and transmission—no coil required, making it easy to carry.
• The thickness measurement device comes with a built-in database of basic material shear wave velocities, and the shear wave velocity values can also be customized.
• The robot weighs less than 5 kg, making it lightweight and highly maneuverable.
• Plug-in lithium battery, easy to replace for longer-lasting battery life.
• Interchangeable fixture. Compatible with various thickness gauges and customizable to suit other instruments.
• Dual cameras provide real-time feedback on the test environment.

EMAT electromagnetic ultrasonic technology consists of a permanent magnet and a conductor carrying alternating current. As AC energy flows through the non-contact coil, it generates an alternating magnetic field, which induces eddy currents on the surface of the base material. Charged particles moving within this magnetic field experience the Lorentz force, causing them to repeatedly change direction along the surface of the object being inspected. This Lorentz force induces controlled micro-vibrations in the particles within the eddy-current region, ultimately generating ultrasonic waves at the surface of the base material. The rebounded ultrasonic energy is then directly detected by the non-contact coil—primarily through magnetostrictive effects—yielding measurable detection signals that reflect the material's characteristics.

The EM4000 Creep Corrosion Thickness Measurement System connects wirelessly to tablets, smartphones, or other Android devices. It supports both A-scan and B-scan modes.

Instrument Function

1. Ultra-portable design, easy to operate, carry, and store.
2. High-brightness 7-inch display screen, with peak brightness up to 1000 nits (cd/m²).
3. Internal storage and playback of technical materials
4. Real-time transmission of robot's travel distance
5. Full-screen touch and physical button dual-mode operation
6. Full HD Digital Video Transmission
7. Equipped with wireless remote operation, with an effective range of (0–24) km.
8. Multi-camera system for monitoring surrounding conditions, with multi-channel composite auxiliary lighting.
9. Capable of being used with a variety of host devices, including ETGmini-X1, ETGmini-X2, and EM4000, enabling multiple consecutive measurements.
10. The minimum pipe diameter for crawling is 50 mm.
11. Built-in high-capacity battery—no external power supply needed.

Water-cooled Wall Tube Inspection	50-tube testing

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