EMAT Thickness Gauge
Industrial inspection equipment
Overview
The EMAT Thickness Gauge is designed for industrial thickness measurement applications where conventional ultrasonic testing may be difficult because of surface conditions, high temperatures or the need for specialised inspection. Using electromagnetic acoustic transducer technology, it enables thickness measurement without requiring conventional liquid couplant in suitable applications. It is particularly relevant to industrial facilities that need to assess metal thickness, corrosion and material degradation during maintenance and inspection activities. The EMAT-A1 configuration offers automatic measurement, B-scan visualisation and thickness-limit control. Its published specifications include a measurement range of 3–300 mm in steel, a maximum operating temperature of 500°C and an accuracy of ±0.1 mm or ±1%, whichever is greater. Actual measurement capability depends on the probe, material properties and inspection conditions. For Indian industries such as steel manufacturing, power generation, petrochemicals, refineries and heavy engineering, EMAT technology can be considered for specialised thickness measurement and corrosion assessment. The B-scan function provides a visual representation of the inspected material, while thickness-limit control helps identify measurements outside defined limits. These functions can support inspection documentation and maintenance planning. When comparing an EMAT Thickness Gauge with a conventional ultrasonic thickness gauge, buyers should evaluate surface preparation requirements, operating temperature, material characteristics, measurement range and inspection accessibility. EMAT technology is not suitable for every material or inspection condition, so application-specific technical evaluation is important before purchasing.
Key Highlights
- EMAT-Based Thickness Measurement Through Challenging Surface Conditions: The NOVOTEST EMAT-A1 uses electromagnetic acoustic transducer technology to measure metal thickness through rust and compatible coatings and air gaps. It enables inspection where conventional contact-based ultrasonic measurement may require additional surface preparation or prove difficult to perform.
- Compatibility with Existing Ultrasonic Flaw Detectors: Designed as an active EMAT transducer the EMAT-A1 extends the capabilities of compatible ultrasonic flaw detectors and thickness gauges. It connects in place of a conventional piezoelectric probe when the instrument supports the required A-scan and bipolar excitation signal. This allows inspection teams to introduce EMAT measurement capability without necessarily investing in an entirely separate instrument.
- Thickness Profiling Through Controlled Surface Scanning: When fitted with the optional probe carriage the EMAT-A1 can scan elongated metal components and generate a profile of thickness variations. This supports the assessment of wall-thickness changes along selected inspection paths and helps identify areas that require further investigation.
- Autonomous Power Supply and Automatic Operation: The active transducer operates using replaceable rechargeable AA or compatible 14500 batteries. Its automatic activation and shutdown in response to excitation pulses from the connected flaw detector simplify operation and eliminate the need for separate manual power control.
- Broad Measurement Capability for Industrial Metal Inspection: The EMAT-A1 supports a stated steel thickness measurement range of 0.8–300 mm depending on the connected instrument and test-object characteristics. This makes it suitable for consideration in specialised inspection applications involving metal components with challenging surface conditions.
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Technical Specifications
| Measurement Range | 3 to 300 mm (steel) |
| Temperature Range | Up to 500°C |
| Accuracy | ±0.1 mm or ±1% (whichever is greater) |
| Frequency | 2.5 MHz |
| Display | 3.5 inch 320 * 480 |
| Power Supply | Built-in Li-ion Battery |
| Operating Time | Up to 8 hours continuous |
| Weight | 1.2 kg |
| Dimensions | 220 x 95 x 45 mm |
| Measuring thicknesses range for steel, mm | 0.6…300.0 (depending on the probe type and object characteristics) |
| Coating thickness or air gap range, mm | up to 6 (depending on the object characteristics) |
| Probes temperature measurement ranges, ° C: Standard probe High-temperature probe | -20 to +50 ° C -20 to +250 ° C, (depending on the conditions and measurement and cooling cycle – up to +500-600 ° C) |
| Measurement units | mm, inch, μs |
| Resolution, mm | 0,01 |
| Type of ultrasonic wave | transverse |
| Manual gain range, dB | 30-100 |
| Ultrasound velocity adjustment range, m/s | 1000-9999 |
| Frequency averaging signal | 1-128 |
| Operating modes | A-scan, B-scan, Control mode |
| Measurement methods | Autocorrelation function (ACF), Echo, Echo Echo (Dual Echo), Peak peak, Front |
| Menu Language | English, Ukrainian, Russian, (*additional languages available by request) |
| Standard | ASTM E797, ISO 16809:2017, EN 14127, EN15317, EN12668-1 |
| Weight of the electronic unit, not more, kg | 0.5 |
| Dimensions (L x W x H) | 165x90x50mm |
| Time of continuous work, not less than, h | 8 |
| Operating temperature range for the electronic unit, ° C | -20 to +50 |
Applications
High-temperature pipe and vessel inspection
Online monitoring of process equipment
Corrosion monitoring through coatings
Petrochemical plant maintenance
Power generation equipment inspection
Steel mill and foundry applications
Offshore platform inspection
Storage tank floor inspection
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Frequently Asked Questions
What advantages does the NOVOTEST EMAT Thickness Gauge offer over conventional ultrasonic thickness gauges?▼
The NOVOTEST EMAT Thickness Gauge utilizes Electromagnetic Acoustic Transducer (EMAT) technology, enabling thickness measurements without the need for couplants or direct surface preparation. This makes it particularly suitable for inspecting hot, oxidized, coated, or rough metallic surfaces while maintaining exceptional measurement accuracy and operational efficiency. EMAT technology is especially valuable in environments where conventional contact-based ultrasonic testing is impractical.
Which industries in India can benefit most from EMAT thickness measurement technology?▼
EMAT Thickness Gauges are widely adopted across asset-intensive industries, including steel manufacturing, thermal power generation, oil and gas, petrochemical processing, railway maintenance, heavy engineering, pressure vessel fabrication, and metal processing facilities. Their ability to perform rapid, couplant-free, non-contact thickness measurements on challenging metallic surfaces makes them an indispensable solution for integrity assessment, corrosion monitoring, and predictive maintenance of mission-critical infrastructure while ensuring uninterrupted operations and long-term asset reliability.
How does an EMAT Thickness Gauge improve predictive maintenance and asset reliability?▼
By enabling accurate thickness measurements on challenging metallic surfaces without interrupting operations, the EMAT Thickness Gauge allows maintenance teams to detect corrosion, wall thinning, erosion, and material degradation at an early stage. This supports condition-based maintenance strategies, reduces unexpected equipment failures, and extends the operational lifespan of valuable industrial assets.
Why is couplant-free inspection important for industrial maintenance applications?▼
Eliminating the need for couplants significantly accelerates inspection procedures while reducing preparation time, contamination risks, and operational complexity. This enables engineers to perform rapid inspections in demanding industrial environments, improving productivity and ensuring consistent measurement reliability under challenging operating conditions.
Why should Indian industries invest in the NOVOTEST EMAT Thickness Gauge?▼
For organizations responsible for managing critical metallic infrastructure, the NOVOTEST EMAT Thickness Gauge delivers superior inspection efficiency, lower maintenance costs, enhanced inspection accuracy, and improved asset integrity management. Its advanced non-contact measurement technology makes it an ideal investment for industries seeking to strengthen quality assurance and optimize long-term maintenance programs.