Dead-weight tester

Hydrostatic test gauges shall be calibrated prior to production and at least once a week. Certified dead weight testers shall be used for calibrations. A buyer representative shall witness the calibration of all... 

The operation of monitoring instrumentation (e.g., transmitters, switches) should be checked by either injecting a suitable signal at the field instrument terminals or by installing the instrument in a comparator (e.g., a hot oil bath, dead weight tester). The result received by the control system on the control room display or local controller I/O register, as applicable, should be recorded. Any problems should be reported to the company/companies responsible. 

The calibration of the pressure transducer was checked regularly using a dead weight tester. The pressure transducer is accurate to less than 0.05 bar. The temperature probe was calibrated against a Prema 3040 precision thermometer. The uncertainty on temperature measurements is estimated to be better than 0.1 °C. 

Dead-weight tester 250 MPa and higher Atmospheric Very accurate, 0.05% f.s. Lab and calibration only... 

Pressure transducers were calibrated using a Model SS2170-150 Seegar Transfer gauge (0 to 150 psia) as a secondary pressure standard. Accuracy of this gauge was 0.05 percent of full scale (0,075 psi), but it was calibrated to the precision of the dial (0.05 psi) with a Ruska dead-weight tester. 

If a dead-weight tester is used instead of the mercury manometer (See 16.2), apply the calibration factor in kilopascals (pounds-force per square inch) established for the pressure gage to the uncorrected vapor pressure. Record this value as the calibrated gage reading and use in Section 7 in place of the manometer reading. 

A 1.7 Dead-Weight Tester—k dead-weight tester can be used in place of the mercury manometer (A 1.5) for checking gage readngs above 180 kPa (26 psi). 

This is an instrument for hardness testing and not a plastometer. The Pusey and Jones tester is used for determining hardness particularly on curved surfaces, such as rubber-covered rolls. It operates on a dead-weight principle. 

The most commonly used techniques involve measurement of vapour pressure up to the critical temperature. The sample is confined over mercury in a tube sealed at the upper end. The mercury can be pressurized using a dead-weight pressure tester and the pressure on the sample varied at will. The critical pressure can either be obtained by measuring the vapour pressure as a function of temperature up to a kelvin or so below the critical point and extrapolating to the critical temperature, or by measurement of the pressure at which the meniscus... 

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