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Cygnus 3 Data Logger Multiple-Echo Ultrasonic Thickness Gauge Kit
SKU: 37154
A rugged multiple-echo ultrasonic thickness gauge with a built-in data logger, error-checked readings through coatings and 18-hour battery life, made for corrosion surveys on tanks, pipes, ships and plant.

| ±0.1 mmAccuracy | 200,000Stored measurements | 18 hBattery life | IP65Aluminum enclosure |
The Cygnus 3 Data Logger is a multiple-echo ultrasonic thickness gauge built for a simple yet versatile way to log metal thickness measurements through protective coatings. Three data logging modes make it easy to record remaining wall thickness across tanks, cylinders, pipes and plant.
Every reading is error checked using three return echoes for repeatable, reliable results, and the multiple-echo technique is accepted by all major classification societies. Housed in a rugged IP65 aluminum enclosure, the gauge comes as a complete kit with a 2.25 MHz probe, test block, software and travel case.
Key Features
![]() | Error-checked readings through coatingsThe gauge measures the time between three consecutive back wall echoes and ignores the time spent in the coating, so there's no need to remove paint or decals. A reading is only verified when the echo times match. "Deep Coat" mode handles coatings up to 20 mm (3/4") thick. |
Built for the Field
Three data logging modes
Choose simple linear logging (up to 5,000 points per record), XY grid logging (up to 100 rows × 50 columns), or template logging with defined measurement points, minimum and reference thickness values and up to 40 user fields. You can also add radial measurements around any chosen point.
Auto-Log for one-handed work
Auto-Log records stable thickness readings automatically, with no key to press. A super-bright multi-color LED confirms each logged reading, and out-of-tolerance alarms flag thin areas.
Secure storage and easy reporting
Data is stored on an internal SD memory card for security and transfers over USB with no driver installation. Data Logger Manager software generates reports, and the Excel add-in imports data straight into worksheets or templates.
Smart, simple operation
The gauge senses the probe type and adjusts its settings automatically. A secure twist-to-lock BNC connection, phone-style alphanumeric keys, an echo strength indicator and a customizable velocity table keep work quick and simple.
Rugged and long-lasting
An IP65 aluminum enclosure with a protective silicone sleeve withstands water, dirt, dust and shocks. Three AA batteries give 18 hours of continuous use, and the gauge can be worn on a waist belt for climbing.
Specifications
| General | |
| Manufacturer | Cygnus Instruments |
|---|---|
| Model | Cygnus 3 Data Logger |
| SKU | 37154 |
| Instrument type | Multiple-echo ultrasonic thickness gauge with data logger |
| Probe connector | BNC, twist-to-lock |
| Compliance | CE; BS EN 15317:2007; RoHS and WEEE compliant |
| Warranty | 3 years on gauge, 6 months on probe |
| Shipping dimensions (estimated) | 457 × 356 × 203 mm (18.0 × 14.0 × 8.0 in) |
| Shipping weight (estimated) | 4.5 kg (10 lb) |
| Measurement | |
| Technique | Multiple-echo, error checked on 3 back wall echoes |
| Range in steel | 3 to 250 mm with 2.25 MHz probe; 2 to 150 mm with 3.5 MHz probe; 1 to 50 mm with 5.0 MHz probe |
| Accuracy | ±0.1 mm (0.005 in) when calibrated to Cygnus Instruments procedures |
| Resolution | 0.1 mm or 0.05 mm, selectable (0.005 in or 0.002 in) |
| Material velocities | 2,000 to 7,000 m/s (0.079 to 0.276 in/µs), covering virtually all common engineering materials |
| Coating thickness | Up to 20 mm (3/4 in) in Deep Coat mode |
| Probe options | Single-crystal soft-faced: 6 mm 5 MHz; 13 mm 2.25, 3.5 or 5 MHz; 19 mm 2.25 MHz |
| Units | Metric or imperial, switchable |
| Data Logger | |
| Logging modes | Linear, XY grid and template, with radial points |
| Capacity | 200,000 measurements; 100 records of up to 5,000 points each |
| Grid record size | 100 rows × 50 columns |
| User data fields | Up to 40 |
| Storage and output | Internal SD flash memory card; USB output with no driver needed |
| Software | Data Logger Manager reporting software; Microsoft Excel add-in |
| Physical & Power | |
| Displays | Large graphic LCD with automatic white backlight; super-bright multi-color LED |
| Power | 3 × AA alkaline, or rechargeable NiMH or NiCd |
| Battery life | 18 hours continuous with alkaline batteries |
| Size | 85 × 170 × 25 mm (3.34 × 6.69 × 0.98 in) |
| Weight | 400 g (14.1 oz) including batteries |
| Operating temperature | -10°C to 50°C (14°F to 122°F) |
| Environmental protection | IP65 |
What's in the Box
- Cygnus 3 instrument with built-in data logger
- 2.25 MHz, 13 mm (1/2") probe
- Protective silicone sleeve
- Adjustable neck strap
- Accessory pouch with couplant, spare membranes and machined test block
- Software and USB cable
- Travel case
- Operation manual
Contents can vary by package, so contact us to confirm what ships with your order.
Complete your thickness testing setup
Add Cygnus 3.5 MHz or 5 MHz probes for thinner sections, a 19 mm 2.25 MHz probe for heavy corrosion and coatings, extra membranes and couplant, or the optional belt/harness clip for climbing and rope access work.
Applications
The Cygnus 3 Data Logger handles maintenance and safety checks of metal thickness on corroded and coated structures.
| ✓ Ships and hull surveys | ✓ Storage tanks |
| ✓ Pipelines | ✓ Bridges and street lighting columns |
| ✓ Offshore platforms | ✓ LPG and process vessels |
| ✓ Road transport tankers | ✓ Cranes, piers, jetties and pilings |
About Cygnus Instruments
Founded in 1983, Cygnus Instruments pioneered the digital multiple-echo technique, now an industry standard for accurate, error-checked thickness measurement through coatings. Its UK-made range includes intrinsically safe, underwater, ROV-mountable, hands-free and data logging thickness gauges.
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