01-27-2011 03:27 PM CET - Industry, Real Estate & Construction
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James Instruments Inc. announces the release of the redesigned Windsor Probe™ electronic measuring unit and manual depth gauge.

Press release from: James Instruments Inc.
Windsor Probe Test System
Windsor Probe Test System
The re-designed WP-725 Windsor Probe™ electronic measuring unit and manual depth gauge offers direct concrete strength readings in both PSI and MPa.

Chicago, IL, USA January 12th , 2011 -James Instruments Inc. manufacturer of the world's most advanced Non Destructive Test Equipment for construction materials officially announces the release of the redesigned Windsor Probe™ electronic measuring unit and manual depth gauge.


Central to the improvement of the concrete infrastructure are tools that evaluate the condition of existing construction. Destructive and non-destructive testing (NDT) techniques are applied. Destructive tests can provide direct information, but are relatively expensive, time-consuming and cause damage to the structure. Destructive test results often cannot be evaluated using statistical approaches because the number of locations in the structure that can be tested without damage to the structure is limited. On the other hand, NDT techniques are relatively inexpensive to apply, and they can detect, localize, and characterize flaws and damage in concrete structures without leaving any undesirable discontinuities or causing damage to concrete members.

The Windsor HP Probe™ System is designed to evaluate the compressive strength of concrete in place. It is non-destructive and can be used with equal effectiveness on fresh and mature concrete. Equally accurate results are obtained on horizontal or vertical surfaces provided that the probe is perpendicular or at

right angles to the test surface. A hardened steel alloy probe is propelled at high speed by an exactly measured explosive charge into the concrete and its penetration measured. Each power load is guaranteed to have an energy level to give an exit muzzle velocity tolerance within ±3%. The compressive strength of the concrete is directly related to the resistance to penetration of the crushed
aggregate and cement matrix: this is determined by the distance required to absorb the specific amount of kinetic energy of the probe. The compressive strength of the concrete is empirically related to the penetration that varies with the hardness of the aggregate. This relationship is recognized by determining the Moh’s scale of hardness of the aggregate and applying a correction factor to the penetration.

The combined contributions of both the aggregate and the cement paste to concrete strength are examined by the test. The accuracy of the inferred strengths has been examined in many independent tests and trials. The Windsor HP results correlate well with the concrete strength determinations

obtained by conventional means.

For most accurate test results ASTM recommends that a correlation be developed for the particular mix design being tested. Exact duplication of cylinder test results should not be expected. The probes measure the strength of the actual concrete in a structure rather than that of a sample compacted and cured under strict and somewhat artificial conditions which do not necessarily represent those of the structure itself. The Windsor Probe test has been approved by federal, state and municipal agencies as well as a number of foreign countries. It conforms to the following tests, specifications and practices:

ASTM C803

ACI 347
ANSI A.10-3
BS 1881 #207

The re-designed WP-725 Windsor Probe™ electronic measuring unit and manual depth gauge offers direct concrete strength readings in both Psi and MPa. No need to purchase a separate unit to obtain both strength values. “ The new redesign allows the end user obtain strength analysis in PSI in Chicago, IL on Monday and conveniently take concrete strength value analysis for example in Germany on Tuesday with the same measuring unit.”, says Nestor Chonillo, Vice President of James Instruments Inc. The new design also allows PC download of your results via USB port for post analysis.

James Instruments Inc. is the leading manufacturer of non-destructive test equipment for construction materials, specifically concrete, ceramic, wood and other coarse grained materials. We supply the instruments that measure and analyze strength, structure, corrosion and moisture in concrete. And more.

James Instruments -- rugged, quality equipment for field use -- backed by factory service and an ongoing program of research and development.

James Instruments Inc. ( Head Quarters )
3727 N. Kedzie Avenue Chicago, IL 60628-4545, USA
1-800-426-6500 +1.773.463.6565 | +1.773.463.0009
info@NDTJames.com | www.NDTJames.com

James Instruments Inc. - Europe
Windmolen 22, 7609 NN Almelo, The Netherlands
Phone: +31 (0)548 659032 | Fax: +31 (0)548 659010
europe@NDTJames.eu | www.NDTJames.com

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