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1、Dead 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 weight
2、s. 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 weigh
3、ts, 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 exactl
4、y.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.Th
5、e 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.Technical data Pressure range: PD 6 0.1 to 6 bar PD 10 0.1 to 10 bar PD 25 0.1 to 25 bar Set of weights in bar / kPa External pressurised air supply for PD 10 and PD 25 required, indeed as
6、 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 effective pressure. Up to 0.6 bar the maximu
7、m error is constantly 0.3 mbar (at 0.05%) resp. 0.18 mbar (at 0.03%) Reference conditions for the granted accuracy: ambient temperature + 20 C 2 C accelaration 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 V
8、AC / 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-pai
9、nted Al-case (self-supporting cap), 3 machine mounts for the exact horizontal positioning according 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“) Required working surface: 520 x 450 mm (20.47“ x 17.72“) Weights: (approx.)
10、PD 6 PD 10 PD 25 Dead weight tester 28 kg 28 kg 28 kg Set of weights 7 kg 16 kg 31 kg Transport box dead weight tester 21 kg 21 kg 21 kg Transport box set of weights 2 kg 5 kg 5+2 kg 1) To reach these pressures, a gas cylinder (nitrogen) or an air pressure intensifier can be applied. PD 6 PD 10 PD 2
11、5ModelsDead Weight Testers Dead weight testers for pressurised air or neutral gasPressure ranges 0.1. 6 bar, 0.1 . 10 bar and 0.1 . 25 bar10912 12/11Scope of delivery Beside the dead weight tester and the set of weights the scope of delivery comprises the following: 1 operating instruction 1 caniste
12、r 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 as replacement 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
13、 plugged in when being deliveredSpecial versions and accessory Set of weights in kp/cm2; other set of weights upon request Test certificate 3.1.B according to EN 10204 for indication accuracy Official verification or DKD-approval(the installation location has to be specified for this) Hose N 4 x 1 f
14、or Prestolock Fitting of the hose 4 x 1 on “ NPT maleOperating 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
15、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
