The upper part of the piston is connected to a platform for. Pdf estimation of error in bourdon type pressure gauge using. Our testers are engineered to offer userfriendly, safe. This type of tester operates on the principle of balancing a known mass against the force exerted by an unknown pressure on a. By using accurate weights and a piston of accurately determined area, these devices form a. Pneumatic deadweight tester model cpb3500 pneumatic deadweight tester, model cpb3500 description proven primary standard the model cpb3500 deadweight tester is a genuine primary standard, which derives the measurement of pressure directly from its fundamental equation p fa. Purchase, rent, and calibration available on most products. A deadweight tester consists of a pumping piston with a screw that presses it into the reservoir containing a fluid like oil, a primary piston that carries the dead weight, w, and the pressure gauge or transducer to be calibrated as shown in the schematic above. How a dead weight tester works learning instrumentation. Pressure gauge calibration with dead weight tester. If a deadweight gage tester is to be used in work for which an accuracy of 0.
How to calibrate a pressure gauge with a dead weight tester. A plunger with a handle has been provided to vary the pressure of oil in the chamber. The type t tester features a reentrant type measuring piston and cylinder assembly, which reduces the rate of fluid leakage and increases float time, helping to maintain accuracy as test pressures increase. The electronic deadweight tester fluke calibration. This mechanical measuring principle provides superior reliability. This design eliminates the necessity to rotate the weights during testing, and allows the user to concentrate on the instrument itself. They work in accordance with the basic principle that p fa, where the pressure p acts on a known area of a sealed piston a, generating a force f.
All three systems have their own specific operational demands. Deadweight testers are the basic primary standard for the accurate. The dead weight tester apparatus consists of a chamber that is filled with oilfree impurities and a pistoncylinder combination is installed on top of the chamber as shown in the diagram. Dwt dead weight tester is based on the principle of pascals law. The law states that in a closed system of incompressible fluid, the pressure applied will exert equal amount of force in all the directions.
Dead weight tester description the dead weight tester apparatus consists of a chamber which is filled with oil free impurities and a piston cylinder combination is fitted above the chamber as shown in diagram. Dead weight tester manufacturers, deadweight tester. Construction and working principle of dead weight tester video lecture of pressure. Hydraulic dead weight tester page 2 of 4 jm test systems. Calibration basics to carry out tests or calibrate a pressure gauge with the dead weigh tester dwt, accurately calibrated weight masses force are loaded on the piston area, which rises freely within its cylinder. As primary standards, they are the most accurate instruments for the calibration of electronic or mechanical pressure measuring instruments. Dead weight testers are a pistoncylinder type measuring device. In dwt system, silicon oil is used within the closed boundaries of the piston cylinder arrangement, piping. Deadweight testers and gauges instruction manual chandler.
Pressurements presscal deadweight tester software pdf. The fluke calibration p3800 series hydraulic deadweight testers can calibrate virtually any high pressure sensing device including transducers, transmitters, gauges, pressure switches or. Deadweight testers and gauges instruction manual revision d october 2006 pn 002a00 sn. A dead weight tester dwt is a calibration sta ndard method that uses a piston cylinder on which a load is placed to make an equilibrium with an ap plied pressure underneath the piston. The dead weight tester is one of the few instruments that can be used to generate pressure in terms of the fundamental units of force and area. Since only the fundamental units of force and area are involved for measurements, the dead weight tester need not be connuously referenced to another pressure instruments for its calibraon accuracy. Data sheets showing similar products and accessories. We provide the worlds only balltype deadweight testers, where the ball and weights float on a thin film of air, which is virtually frictionless. P3800 series high pressure hydraulic deadweight testers. Choosing a backup generator plus 3 legal house connection options transfer switch and more duration. A dead weight tester apparatus uses known traceable weights to apply pressure to a fluid for checking the accuracy of readings from a pressure gauge. The pressure gauge to be tested is fitted at an appropriate plate.
872 812 388 160 563 27 182 1296 656 1061 238 133 1334 773 427 79 980 111 1133 1380 336 87 298 1011 88 1175 525 139 705 1331 328 160 485 33 1345 171 1086 1162 528 447 699 1372 1459 1420 689 478 1044 8 635 489 1364