NM01T40332845
The DAKOTA FC3750 Non-Magnetic Single Element Contact Transducer is a specialized ultrasonic probe designed for precise ultrasonic testing (UT) of fastener materials (all metals). This transducer is particularly suited for applications like bolt tension monitoring and detecting flaws or measuring thickness in critical fastener components.
Here's a breakdown of its key specifications and features:
Non-Magnetic: This is a crucial feature, especially when dealing with magnetic particle inspection (MPI) or in environments where magnetic fields could interfere with the ultrasonic signal or alter the material's properties. It also ensures the transducer itself doesn't become magnetized, which is important for certain applications or subsequent inspection methods.
Single Element: This indicates that the transducer contains a single piezoelectric crystal that functions as both a transmitter and receiver of ultrasonic waves (pulse-echo mode). Single element transducers are generally good for general flaw detection and thickness gauging.
Contact Transducer: Designed for direct contact with the test surface, requiring a coupling medium (like gel or glycerin) to transmit ultrasonic energy effectively into the material.
Fastener Material Types: All metals: This highlights its versatility, confirming it's suitable for inspecting a wide range of metallic fasteners, including steel, aluminum, titanium, and other alloys, which is critical in aerospace, automotive, and construction industries.
3/8" Element Diameter: Refers to the size of the active piezoelectric element, which is 0.375 inches. This is a common size that offers a good balance between beam spread and penetration.
5 MHz Frequency: This is the nominal frequency of the ultrasonic waves generated by the transducer. A 5 MHz frequency provides a good balance between penetration and resolution. Higher frequencies offer better resolution for smaller flaws or thinner materials, while lower frequencies offer greater penetration for thicker or more attenuating materials. For fasteners, 5 MHz is often a good choice for detecting smaller flaws or for precise length/elongation measurements.
Model – FC3750: This is the specific model number assigned by Dakota, where "FC" likely indicates "Finger Tip Contact" and "3750" relates to the 0.375" diameter and 5.0 MHz frequency. Dakota's "Finger Tip" series of transducers are often noted for their compact size and good near-surface resolution.
Microdot Connector, Side Entry:
Microdot: This is a very common type of coaxial connector used on ultrasonic transducers, known for its small size and secure connection.
Side Entry: This refers to the orientation of the connector on the transducer housing. A side-entry connector means the cable exits from the side of the transducer body, which can be advantageous in tight spaces or when a low-profile setup is required for scanning.
Manufacturer: DAKOTA: Dakota Ultrasonics is a well-known and reputable manufacturer of ultrasonic testing equipment, including thickness gauges and transducers, particularly recognized for their instruments used in bolt tension monitoring.
Primary Applications:
Bolt Tension Monitoring: The FC3750, especially as a non-magnetic single element contact transducer for fasteners, is commonly used with bolt tension monitors (like Dakota's own BT1-DL or Mini-Max series) to measure the elongation, load, stress, and percent strain of tightened fasteners. This is a far more accurate method of ensuring proper bolt tension than relying solely on torque.
Flaw Detection in Fasteners: Detecting internal flaws such as cracks, voids, or inclusions within the body of a fastener.
Thickness Measurement: Measuring the length or thickness of fasteners.
Material Characterization: Assessing the integrity and sound velocity of the fastener material.
Key Benefits:
Precision and Accuracy: Designed for accurate measurements in critical applications like bolt tension.
Versatility: Suitable for all metal fastener types.
Interference Reduction: Non-magnetic properties prevent interference in certain environments.
Access in Tight Spaces: The compact "finger tip" design and side-entry connector facilitate inspection in confined areas.
Reliable Performance: From a reputable manufacturer like Dakota, known for quality NDT probes.