• Ravika Instruments

Dead Weight Pressure Gauge Testers

Ravika Instruments offers a wide range of Dead Weight Pressure Gauge Testers. These are used in calibration of pressure gauges and other sensing, transmitting and recording pressure instruments. The testers make use of the relationship between pressure acting on the known area of a vertically free floating piston producing a force balanced by a known dead weight. Main component of the tester is the screw pump to generate pressure in the circuit of adequate capacity operated by a spoked handle, which permits easy and accurate setting of pressure. High pressure calibrators are provided with a lever operated priming pump as well. Free piston assembly of special steel, hardened, tempered, ground and lapped to accurate size and very fine surface finish provides true floating action. Higher accuracy dead weight testers having accuracy of ±0.03% are provided with tungsten carbide piston assembly. A set of weights directly marked in convenient values of pressure and easily stacked on the weight carrier, which is placed on to the free piston, is incorporated. It is mounted on a sturdy base plate provided with levelling screws. The entire circuit is covered by a sheet metal cover. The calibration is done against master dead weight pressure gauge tester certified and characterised by National Physical Laboratory, New Delhi, using cross-float method. The instruments have accuracies of ±0.1%, 0.05% and 0.03%, backed by Test & Calibration Certificates traceable to National Standard to meet the requirements of ISO 9000, QS 14000 and other inspection agencies. The dead weight testers are available up to 1000 kgf/cm² pressure range in various units of calibration, viz., kgf/cm², lbf/in², bar and MPa units. The company also manufactures precision dial pressure and vacuum gauges of accuracies ±0.25% with test certificate traceable to National Physical Laboratory.