About Multiple Echo

All Ultrasonic Thickness Gauges should be calibrated to the velocity of sound of the material being measured. Coatings have a different velocity of sound than metal and it is important they are not included in the measurement. Multiple Echo ensures all coatings, up to 6mm thick, are completely eliminated from the measurement.

How it works:

A transmitted ultrasound pulse travels though both the coating and the metal and reflects from the back wall. The returned echo then reverberates within the metal, with only a small portion of the echo travelling back through the coating each time. The timing between the small echoes gives us the timing of the echoes within the metal, which relate to the metal thickness. The returned echoes need not be consecutive as the gauge will interpret them automatically and calculate the thickness. A minimum of three echoes are checked each time. This is referred to as the Automatic Measurement Verification System (AMVS).

Specification:

• Sound Velocity Range From 1000 m/s to 8000 m/s (0.0394 in/μs to 0.3150 in/μs)
• Single Crystal Soft Faced Probe Options 2.25 MHz, 3.5 MHz, 5 MHz
• Probe Measurement Range 3 – 250 mm(0.120” to 10”), 2 – 150 mm(0.080” to 6”), 1 – 50 mm(0.040” to 2”)
• Probe Sizes 13 mm (0.5”), 19 mm (0.75”), 13 mm (0.5”), 6 mm (0.25”), 13 mm (0.5”)
• Resolution 0.1 mm (0.005”) or 0.05 mm (0.002”)
• Accuracy ± 0.1 mm (0.005”) or ± 0.05 mm (0.002”)
• Display Colour LCD
• Coatings Range Up to 6mm (Standard Mode)*; up to 20mm (Coating Plus+)*
• Batteries 3 x disposable AA alkaline batteries or rechargeable NiMH / NiCD
• Battery Life Up to 50 hours continuous use using alkaline batteries
• Gauge Dimensions 147 mm x 90 mm x 28 mm (5.75” X 3.5” X 1”)
• Gauge Weight 325 g (11.5 ounces) including batteries
• Environmental Case rated to IP65. RoHS and WEEE compliant
• Operating Temperature -10°C to +50°C (14°F to 122°F)
• Storage Temperature -10°C to +60°C (14°F to 140°F)