Ultrasonic Measuring

Delta Sigma Ultrasonic Box

The Delta Sigma pulse-echo ultrasonic time-of-flight (TOF) measurement device measures, displays, stores and transfers bolt load and elongation data in a new, single purpose unit. The Delta Sigma uses a rugged, sealed color touch screen for all operator I/O. The screen uses proven medical touch panel hardware. The measurement system is a hybrid technique, using the best of both analogue and digital signal processing techniques for fast signal acquisition and precise single shot TOF measurement.

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Delta Sigma Ultrasonic Box

The Delta Sigma pulse-echo ultrasonic time-of-flight (TOF) measurement device measures, displays, stores and transfers bolt load and elongation data in a new, single purpose unit. The Delta Sigma uses a rugged, sealed color touch screen for all operator I/O. The screen uses proven medical touch panel hardware. The measurement system is a hybrid technique, using the best of both analogue and digital signal processing techniques for fast signal acquisition and precise single shot TOF measurement.

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Product Details

Low Cost Ultrasonic bolt elongation and load measuring instrument.
Simple medical grade color touch screen interface (Can be used with gloves or stylus).
Export measurements directly to PC with no proprietary software required.
IP44 Rated aluminum body construction offers unmatched durability in the field.
Long-Lasting rechargeable batteries offer 20 hours of continuous operation.
Temperature Probe is included for automatic temperature compensation.
Ultrasonic Specs
Resolution0.1ns
Size1.75”l x 7”w x 7”h
Weight3.2 lbs

How does Ultrasonic Measurement Work?

Bolt Tension

A bolt is a spring. The elastic behavior of materials within a bolt holds it together. Much like an elastic band, there is a point at which a bolt can be stretched but still maintain its integrity. Design engineers push the limits of these materials to properly fasten joints. Over torqueing can push a fastener to yield. Undertorquing can cause the joint to fail. Joint failure for either of these two reasons can be dangerous and costly. Therefore, it is important to know the tension of a fastener.

What is Ultrasonic Measurement?

Ultrasonic measurement provides a precise method of determining bolt tension after preload. An ultrasonic signal is sent down one end of the fastener and the time it takes to return to the transducer is measured. Based on the time of flight of this ultrasonic signal, the bolt elongation can be determined using a reference measurement (unloaded fastener length). The delta, or change in length of the bolt before and after preload paired with the bolt geometry, can be used to accurately calculate the amount of tension within the installed bolt. Ultrasonic measurements can be used to validate torque applications and reduce preload scatter by up 20%. Unlike deflection validation, ultrasonic measurements can be used in applications with blind holes as the transducer used only needs access to one end of the fastener. Additionally, if the unloaded length of the fasteners used in known prior to the initial preload, ultrasonic measurements can be used to measure residual preloads after application loading and ensure bolts are still within specification.

See the Delta Sigma Ultrasonic Box in Action

Delta Sigma Intro

DS DNV II

ISO 9001 Certified

U.S. Patent Nos. 8,434,389 and 8,991,284

European Patent No. 2396147

Canadian Patent No. 2,752,088

Japanese Patent No. 5699338

U.S. Patent Nos. 8,434,389 and 8,991,284

European Patent No. 2396147

Canadian Patent No. 2,752,088

Japanese Patent No. 5699338