压力表检测仪器仪表Dead Weight TestersDead weight testers for pressurised air or neutral gasPressure ranges 0.1. 6 bar, 0.1 . 10 bar and 0.1 . 25 barDead weight testers are used for examination and calibration of pressure gauges and other pressure measuring instruments without using an external instrument. The main components are the measuring system, the valve units, the built-in screw pump for accurate pressure adjustment and the set of weights.The measuring system itself consists of a precise lapped-in pair of piston and cylinder. During the measuring process the piston is forced up by the pressure produced with the built-in screw pump re-spectively with external pressure supply, while the regular weights and maybe further extra weights, if required for the designated test pressure, press it down.With the built-in screw pump the test pressure can be adjusted to an equilibrium of the forces. When the forces on both sides of the piston are in balance, the piston will be floating, and the designated test pressure is reached exactly.For simplifying the handling, the instrument-specific weights are already referred to each relevant determined piston area and stamped with the pressure unit (bar/kPa).The influence of the friction between piston and cylinder is mini-mised by keeping piston and weights rotating while floating.The models described in this data sheet are available for pressure ranges 0.1 to 6, 0.1 to 10 resp.0.1 to 25 bar.PD 25ModelsPD 6PD 10 Technical data? Pressure range: PD 6 PD 10 PD 25 ? Set of weights in bar / kPa0.1 to 6 bar0.1 to 10 bar 0.1 to 25 barScope of delivery? External pressurised air supply for PD 10 and PD 25 required, indeed as high as the pressures that have to be examined1) ; external pressurised air supply for PD 6 recommended (compare page 2) ?Accuracy of the adjusted examination pressure: better 0.05 % resp. 0.03 % (with official verification or DKD-approval) referred to the effectivepressure. Up to 0.6 bar the maximum error is constantly0.3 mbar (at 0.05%)resp. 0.18 mbar (at 0.03%)Beside the dead weight tester and the set of weights the scope of delivery comprises the following:? 1 operating instruction? 1 canister with 1 litre special oil (drilling oil and sealing liquid)? 1 cover plate? 1 special sealing for test item with 2 chambered o- rings? 4 o-rings asreplacement? 2 expansion plugs for N 6x1 (admission pressure connection) for models PD 6 and PD 10? 2 plugs for oil drains (21, 26 compare page 3), already plugged in when being delivered? Reference conditionsfor the granted accuracy:ambient temperature + 20C2Caccelaration of fall = 9.8102 m/s2? Dimension of the crosssection of the measuring unit:1.0 cm2 0.2 % ? Rotation of the weights: by electrical drive (220 VAC /50 Hz / 45 mA)? Connection for pressure gauges:1 clamping sleeve G ? and M 20x1.5 each ? Connection for external pressurised air: plug connection(Prestolock) for PA hose N 4 x 1, for PD 6 and PD 10 with expansion plug for N 6 x 1 ? Medium: pressurised air or neutral gas, e.g. nitrogen? Case: grey -painted Al-case (self-supporting cap), 3 machine mounts for the exact horizontal positioningaccording to installed circular level ? Case dimensions including star handle: (L x W x H) 490 x 480 x 330 mm (19.29 x 18.9 x 12.99)Weights: (approx.) Dead weight tester Set of weightsTransport box dead weight tester Transport box set of weightsPD 6 28 kg 7 kg 21 kg 2 kgPD 10 28 kg 16 kg 21 kg 5 kg? Official verification or DKD-approval(t he installation location has to be specified for this)? Hose N 4 x 1 for Prestolock? Fitting of the hose 4 x 1 on ? NPT male Special versions and accessory Operating instructions(see also page 3, drawing 1.5b)ATTENTION !Please handle the dead weight tester only at the hanholds for transporting and repositioning, but never at the measuring system. Otherwise this could lead to serious damage.Putting into operationThe dead weight tester and the set of weights are supplied in separate wooden transport boxes (PD 25 two boxes for set of weights).Please release the transport screws before taking the instrument out of the transport boxes.Place the instrument at the workplace and adjust it via the in-tegrated circular level by screwing in the machine mounts. The machine mounts have orifices for mounting to the workplace.Screw in the clamp handles and the helicoidal gear pump head.Plug in the motor. .? Required working surface: 520 x 450 mm (20.47 x 17.72)?1)PD 25 28 kg 31 kg 21 kg 5+2 kgT o reach these pressures, a gas cylinder (nitrogen) or an air pressure intensifier can be applied.1091212/11Connection of the ad