The series 50 Proving Rings are designed for specific applications requiring high capacities with low profiles. They are particularly well -suited for the calibration of concrete testing machines and other types of testing machines with limited daylight openings.
Other Morehouse proving rings are designed to give the greatest possible deflection under load to achieve maximum accuracy. This design criteria, however, requires large outside proving ring diameters. In high capacity proving rings, the size is prohibitive in many applications.
The series 50 proving rings are produced only in higher capacities where size is critical. because of their low-profile, they are also lighter in weight than comparable capacities in larger diameter rings resulting in easier handling.
While the amount of deflection under load is reduced in the series 50 proving rings, it is still sufficient to provide low uncertainties with good readability. An adjustable vernier index supplied supplied with the proving ring may be set to zero at the no-load condition to further simplify readings during calibrations. Series 50 proving rings fall well within the specifications outlined in ASTM E74 for standards used in Class A loading ranges.
Specification
Uncertainty
: 0.075% of capacity (75 lbf per 1000 lbf)
Readability
: 1/10 division (0.024% of full scale)
Sensitivity
: 1/20 division (0.012% of full scale)
Capacity Load Deflection
: Approx. 400 major divisions
Calibration
: By Morehouse Force Calibration Laboratory to ASTM E-74 Standard
Capacity:
: 500 to 1000,000 pounds in compression mode only
Series 100
Description
The Classic Series 100 proving rings is the forerunner of the entire current series of Morehouse proving rings. It is perhaps the most widely used and respected proving ring in the world. It has been the field calibration standard preferred by many experienced operators for more than 40 years-and most of the original rings are still in use. The series 100 proving ring offers all the accuracy, reliability and consistency ever needed for many force calibrations. It is recommended for calibrating materials testing machines, torque-measuring dynamometers, thrust stands and other force measuring systems. The micrometer dial is read with a single index line pointer. However, a vernier index pointer is available as an optional accessory. All capacities are available in compression types and combination compression/ tension types with threaded external bosses to which pulling rods may be attached for use in tension calibrations.
Specification
Uncertainty
: 0.05% of capacity (.5 lbf per 1000 lbf)
Readability
: 1/10 division (0.016% of full scale)
Sensitivity
: 1/20 division (0.008% of full scale)
Capacity Load Deflection
: Approx. 600 major divisions
Calibration
: By Morehouse Force Calibration Laboratory to ASTM E-74 Standard
Capacity:
: 500 to 1000,000 pounds in compression and tension mode
Series 200
Description
The Series 200 proving ring, while similar to the series 100, has three performance-proven features which increase its accuracy. It has a larger 200-division dial, a finer-pitch micrometer screw and a greater deflection under load. As a result, its uncertainty is reduced and operator confidence is improved. Ease of use is further increased with the adjustable vernier index. Readings to 1/10 division and interpolation to 1/20 division are possible. Because the index is adjustable, the dial will actually read zero on the no-load reading. The Series 200 proving rings are suggested for calibrating load cells and materials testing machines where high degree of accuracy are desired. All capacities are available in compression types and combination compression/ tension types with threaded external bosses to which pulling rods may be attached for use in tension calibrations.
Specification
Uncertainty
: 0.025% (.25 lbf per 1000 lbf of capacity)
Readability
: 1/10 division (0.01% of full scale)
Sensitivity
: 1/20 division (0.005% of full scale)
Capacity Load Deflection
: Approx. 1000 major divisions
Calibration
: By Morehouse Force Calibration Laboratory to ASTM E-74 Standard
Capacity:
: 500 to 1000,000 pounds in compression and tension mode
Series 1000
Description
The extremely low uncertainty and high resolution capability of the Series 1000 proving ring has never been equalled by any other secondary force standard. Every Series 1000 proving ring is calibrated by primary standards with direct traceability to the United States National Institute of Standards & Technology. In addition, the resulting "Report of Calibration" issued by the force calibration laboratory is included with the ring. Therefore, the Series 1000 proving ring is the perfect choice for use in standards laboratories where the highest possible accuracy is required and direct traceability preferred.
The uncertainty of the Series 1000 proving ring is 0.0125% of capacity. This capability results from the ring design which allows greater deflection under load than other proving rings. The increased change in diameter can be measured up to 2000 major divisions on the micrometer dial. A vernier index further improves readability to one-tenth of a major dial division and makes possible interpolation to one-twentieth of a division.
To facilitate calibrations, the Series 1000 proving rings are equipped with an electric reed vibrator, a dial revolution counter, a vernier index, a carbide micrometer contact to minimize wear and a ball seat in the top boss.
Specification
Uncertainty
: 0.0125% (.125 lbf per 1000 lbf of capacity)
Readability
: 1/10 division (0.005% of full scale)
Sensitivity
: 1/20 division (0.0025% of full scale)
Capacity Load Deflection
: Approx. 2000 major divisions
Calibration
: By Morehouse Force Calibration Laboratory to ASTM E-74 Standard
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