Model PDW - 30
PDW 30 series models have 2 free piston assemblies to apply low pressure range with small steps and high pressure range with larger steps. It is combined in a single instrument with a large amount of cost saving. The ratio of LP and HP free pistons areas is 10:1. The ratio of 5:1 or 20:1 can be made available.
Working Principle: The instrument relates between the pressure applied to the known area of a vertically free floating piston generating a force equalized by the known dead weights.
Main components of the tester are:
Screw Pump: The screw pump applies pressure in the circuit of sufficient capacity. The screw pump makes sure that the spoked handle allows accurate pressure setting.
Priming Pump: (Provision is given only in High pressure Calibrators): A lever operated a pump that supplies oil to fill up the huge gauges or external piping. It has the ability to create 5% to 10% of the instrument range and with isolating valves at the extremes forming a closed circuit for removing air.
Free Piston Assembly: A high strength steel piston adjusted with accurate size and fine surface topography providing floating action.
Set of Weights: Every single weight is stamped with values of pressure and kept one over the other on the weight carrier fixed on the free piston. Dual marking is provided on every weight for low and high pressure range respectively in Dual range Dead Weight Testers. The different units of pressure measurement such as KN/m2, kPa, lbf.in2, kgf/cm2, can be adjusted according to the customer. The weights are provided in two material options: SS 304 and MS Phosphated black. A separate storage box is given for safe storage of weights.
Gauge Connector: ½” BSP (female) union for connecting the gauge to be tested. Various other sizes of gauge may be connected using adaptors.
Base Plate: A strong base plate which can take the load of the instrument having legs and levelling screws. The whole circuit is protected by a sheet metal cover.
Incremental Weights: For getting better least count, it is available with every model by paying an extra charge.
Calibration/ Traceability: Cross float method are used to calibrate against Master Dead Weight Pressure Gauge Tester that possesses certification and characterisation by National Physical Laboratory, New Delhi. The instruments have accuracies of +/- 0.1%, +/-0.05% and +/- 0.03%. Our instruments possess test certificates traceable to National Standard which meets the requirements of QS 14000, ISO 9000 and other Inspection agencies.
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