Dead Weight Pressure Gauge Tester - PDW 20 Series

PDW 20 series have a lever operated Priming Pump that supplies oil to fill up the gauges or external piping. It can create 10% of instrument range and with isolating valves at the extremes forming a closed circuit for removing air.

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: 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. 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.

Incremental Weights: For getting better least count, it is available with every model by paying an extra charge.

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.

Calibration/ Traceability: Cross float method are used to calibrate against Master Weight Pressure Gauge Tester and Master Dial Pressure gauges. Our instruments possess test certificates traceable to National Standard which meets the requirements of QS 14000, ISO 9000 and other Inspection agencies.

Specification

• Operating Fluid-Hydraulic Oil (Mobil Oil)
• Environmental Condition Temperature 23°C ± 1°C
• Humidity 50% ±10%
• Accuracy of instrument ±0.5 % 
• Gauge connector ½” BSP(female)
• Standard Adaptors : M20 x 1.5, 1/4" BSP & 3/8" BSP
• Optional Adaptor 1/8", 1/4", 3/8", 1/2" NPT
• Gravity : 9080665 m/s2
• Air Density : 1.159087 Kg/m3 (For Low Pressure)
• 1.155872 Kg/m3 (For High Pressure)

Features

• Priming Pump is capable of developing 5% - 10% of the instruments range
• Storage Box for weights are provided
• Set of spare seals
• Dust cover to prevent dust
• Instruction manual is provided
• Tin of Oil (1/2L)
• Provision of Standard Tool Kit including Spanners, Allen Key, Screw Driver, Spirit Level
• Stainless steel pipelines
• Weights are made up of stainless steel/ MS Phosphated black
• Base of the instrument is MS Painted
• Piston is made up of HCHCr and Tungsten Carbide
• Cylinder HCHCr and Tungsten Carbide