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To complement its range of ultrasonic thickness gauges, Cygnus Instruments offer a range of ultrasonic probes. The performance of any ultrasonic thickness gauge relies heavily on the quality of the probe and its suitability to the material being measured. Therefore selecting the right probe is vital.
All Cygnus probes are constructed from stainless steel and incorporate a replaceable wear membrane to protect the probe face ensuring years of reliable, accurate service
Cygnus Remote Probes Brochure
Enquire about the Remote Probes
Guidelines for Probe Frequency Selection
The probe frequency will be determined by the minimum thickness you need to measure, however the lower the probe frequency the more effective the ultrasound will be at penetrating coatings and corrosion. The 2.25 MHz 13mm probe is recommended for the majority of applications as it performs the best on corroded metal and through thick coatings.
| Frequency | Face Size | Face Colour | Range In Steel | Typical Applications |
| 5.0 MHz | 6 mm (1/4”) | Black | 1 to 50 mm | Small diameter pipes and boiler tubes/heat exchangers |
| 5.0 MHz | 13 mm (1/2") | Black | 1 to 50 mm | Measuring wall thickness down to 1mm |
| 3.5 MHz | 13 mm (1/2") | Orange | 2 to 150 mm | Measuring wall thickness down to 2mm with corrosion through coatings |
| 2.25 MHz | 13 mm (1/2") | Red | 3 to 250 mm | Standard probe supplied, best for all round measurement of wall thickness with corrosion through coatings. |
| 2.25 MHz | 19 mm (3/4") | Red | 3 to 250 mm | Large flat plates with heavy corrosion and/or through thick coatings. |
Probe Membranes
All Cygnus probes have a protective membrane fitted in front of the probe face to protect it from damage during use on rough corroded surfaces. A thin film of membrane couplant sits between the membrane and the probe face to allow the ultrasound to pass through. The membrane also helps the probe face “mould” to uneven corroded surfaces aiding measurement.
The performance of the probe depends on the condition of the membrane and how well it has been fitted. Cygnus recommends membranes are replaced frequently as a precaution or at the first sign of any scoring, tearing or damage.
Membranes are available in two materials, the standard Polyurethane membrane is suitable for surface temperatures up to 75°C (167°F), the Teflon membrane is suitable for surface temperatures up to 150°C (302°F) with a maximum contact time of 5 seconds.
Standard Polyurethane (75°C) Pack of 20
| Order Code | Probe Size |
| 001-3702 | 6mm Probe |
| 001-3701 | 13mm Probe |
| 001-3700 | 19mm Probe |
Teflon (150°C) Pack of 10
| Order Code | Probe Size |
| 001-4873 | 6mm Probe |
| 001-4874 | 13mm Probe |
| 001-4875 | 19mm Probe |
Remote Probes
Remote Probes for use with Cygnus 2, Cygnus 3 & Cygnus 4 Gauges. Probes are fitted with a BNC connector as standard but can be supplied with a Lemo-00 connector upon special request.
All Remote Probes are supplied with a 1.35 meter probe cable with a choice of connector to suit the model of thickness gauge.
Note. For Underwater, Intrinsically Safe & Heavy Duty gauges specific remote probes are available and are detailed on separate Data Sheets.
| Order Code | Frequency | Face Size | Probe Connector | Cable Connector | Cable Connects to |
| 004-9361 | 5.0 MHz | 13mm | BNC | Lemo 1 | Mk4 Cygnus 2, 3 & 4 Gauges |
| 004-9313 | 3.5 MHz | 13mm | BNC | Lemo 1 | Mk4 Cygnus 2, 3 & 4 Gauges |
| 004-9310 | 2.25 MHz | 13mm | BNC | Lemo 1 | Mk4 Cygnus 2, 3 & 4 Gauges |
| 004-9311 | 2.25 MHz | 19mm | BNC | Lemo 1 | Mk4 Cygnus 2, 3 & 4 Gauges |
| 004-9314 | 5.0 MHz | 6mm | Lemo 00 | Lemo 1 | Mk4 Cygnus 2, 3 & 4 Gauges |
| 004-9315 | 5.0 Mhz | 13mm | Lemo 00 | Lemo 1 | Mk4 Cygnus 2, 3 & 4 Gauges |
| 004-9312 | 3.5 MHz | 13mm | Lemo 00 | Lemo 1 | Mk4 Cygnus 2, 3 & 4 Gauges |
| 004-9301 | 2.25 MHz | 13mm | Lemo 00 | Lemo1 | Mk4 Cygnus 2, 3 & 4 Gauges |
Remote Probe Dimensions
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