Single Crystal Ultrasonic Probes

Cygnus single crystal probes are for use with the gauge in Multiple-Echo mode to read through and ignore coatings.

These have one piezo-ceramic crystal. This crystal both sends and receives the ultrasound energy.

The S2C single crystal 2.25 MHz 13 mm (0.51 in) probe is recommended for the majority of applications and can be used to read through coatings up to 20 mm (0.79 in) thick with the gauge in Deep Coat mode.

Details of our Range of Single Crystal Probes

Probe ID
Number
Frequency
Face
Size
Band /
Face Color
Connector
Type
Range in
Steel
Typical Application
S2C 2.25 MHz
13 mm
(0.51 in)
Red Band BNC
3 – 250 mm
(0.120 – 10.00 in)
Standard probe supplied, best for all round measurement of wall thickness with corrosion through coatings
S2D 2.25 MHz
19 mm
(0.75 in)
Red Face BNC
3 – 250 mm
(0.120 – 10.00 in)
Large flat plates with corrosion and/or through thick coatings
S3C 3.5 MHz
13 mm
(0.51 in)
Orange Band BNC
2 – 150 mm
(0.080 – 6.000 in)
Measuring wall thickness down to 2 mm (0.08 in) with corrosion through coatings
S5A 5.0 MHz
6 mm
(0.24 in)
Black Face Lemo 00
1 – 50 mm
(0.040 – 2.000 in)
Small diameter pipes and boiler tubes / heat exchangers
S5C 5.0 MHz
13 mm
(0.51 in)
Black Band BNC
1 – 50 mm
(0.040 – 2.000 in)
Measuring wall thickness down to 1 mm (0.04 in)

Probe Membranes

All Cygnus single crystal 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 “mold” 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. Please visit our Technical Downloads page to see the probe membrane fitting and maintenance video and instructions.

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 (167°F)) Pack of 20

Order Code Probe Size
Size of Head inc.
Knurled Ring
Physical Size of
Membrane (approx.)
001-3702 6 mm (0.24 in) 18 mm (0.71 in) 14 mm (0.55 in)
001-3701 13 mm (0.51 in) 24 mm (0.94 in) 21 mm (0.83 in)
001-3700 19 mm (0.75 in) 30 mm (1.18 in) 28.5 mm (1.12 in)

Teflon (150°C (302°F)) Pack of 10

Order Code Probe Size
Size of Head inc.
Knurled Ring
Physical Size of
Membrane (approx.)
001-4873 6 mm (0.24 in) 18 mm (0.71 in) 14 mm (0.55 in)
001-3701 13 mm (0.51 in) 24 mm (0.94 in) 21 mm (0.83 in)
001-3700 19 mm (0.75 in) 30 mm (1.18 in) 28.5 mm (1.12 in)

Single Crystal Probe Connectors (if not potted with integral cable)

13 mm (0.51 in) and 19 mm (0.75 in) single crystal probes have a BNC connector   

5 MHz 6 mm (0.24 in) single crystal probes have a Lemo 00 connector   

Cables for use with Single Crystal Probes (that aren’t potted with integral cables)

Gauge Type
Probe Type C2 C4 C2+ C4+ C6+
Gauge has Lemo 1 Gauge has Twin Lemo 00 Connector
S2C

S2D

S3C

S5C

004-0406
Lemo 1 – BNC
004-0401
Lemo 00 – BNC
S5A 004-0401
Lemo 1 – Lemo 00
004-0412
Lemo 00 – Lemo 00

For DIVE, Underwater, ROV Mountable, Intrinsically Safe and Heavy Duty gauges, probes with integral cables fitted are supplied.

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