Models of DW 30 series are provided with 2 free piston assemblies for giving Low Pressure range with smaller steps and High Pressure range with larger steps in a single instrument with substantial cost saving. The ratio of areas of LP and HP Free Pistons is generally 10:1. Ratio of 5:1 or 20:1 can also be provided.

WORKING PRINCIPLE: The Dead Weight Pressure Gauge Testers make use of the relationship between pressure acting on the known area of a vertically free floating piston producing a force balanced by known dead weight.

MAIN COMPONENTS of the tester are :-

Screw Pump: It is used to generate pressure in the circuit of adequate capacity and is operated by a spoked handle which permits easy and accurate setting of pressure.

Priming Pump: (provided only in High Pressure Calibrators) : It is a lever operated pump used for providing continuous oil delivery for filling up large gauges or even external piping. This pump is capable of developing 5% — 10% of the instrument range. Isolating valves are provided at both ends. It forms a unique closed circuit for effective air removal.

Free Piston Assembly: It is made of special steel, hardened, tempered, ground and lapped to accurate size and very fine surface finish provides true floating action.

Set of Weights: Each weight is directly marked in convenient values of pressure and is easily stacked on the weight carrier which is placed on to the free piston. Dual range Dead Weight Testers (DW 30 series) have dual markings on each weight for low & high pressure ranges respectively. The calibration can be provided in various units of pressure measurement namely kgf/cm2, bar, lbf/in2, kPa, KN/m2 as per customer requirement. Weights are available in two material options : MS Phosphated black & SS 304. Storage box is provided for storing weights safely.

Gauge Connector: of 1/2" BSP (female) union for connecting the gauge to be tested. Gauges with other connecting threads may be connected using adoptors provided.

Base Plate: The instrument is mounted on a sturdy base plate provided with levelling screws. The entire circuit is covered by a sheet metal cover.

Incremental Weights: to provide smaller steps (better least count) is available for all models at extra cost.

Calibration / Traceability: Calibration is done against Master Dead Weight Pressure Gauge Tester certified and characterised by National Physical Laboratory, New Delhi using cross-float method. Our instruments are of the accuracies +/- 0.1%, +/- 0.05% & +/- 0.03% and are backed by test certificates traceable to National Standard to meet the requirements of ISO 9000, QS 14000 and other Inspection Agencies.

FIELDS OF APPLICATION: Automobile Industry Breweries & Distilleries Textile Industry Pipe Manufacturers Pipeline Contractors Metals Industry Cement Industry Electronics Industry Paper Industry Engineering Industry Food & Drug Industry Chemicals & Fertilizer Industry Glass Industry Industrial & Medical Gases Sugar Industry Gas & LPG Cylinders Petroleum & Petrochemical Industry Airlines Railways Defence Organisation Engg. Colleges & Training Institutes Ceramic Industry Thermal Power Stations Hydro-Electric Power Generation     STANDARD PARAMETERS Gravity : 9080665 m/s2 Air Density : 1.159087 Kg/m3 (For Low Pressure)                         1.155872 Kg/m3 (For High Pressure)

OPERATING FLUID: Hydraulic Oil   (Multigrade Mobil Oil)     STANDARD ACCESSORIES: Storage Box for Weights Set of Spare Seals Dust Cover Instruction Manual Tin of Oil (1/2 L) Adaptors : M20 x 1.5, 1/4" BSP & 3/8" BSP Standard Tool Kit including Spanners, Allen Key, Screw Driver, Spirit Level     MATERIAL OF CONSTRUCTION Piston : HCHCr / Tungsten Carbide Cylinder : HCHCr / Tungsten Carbide Base Instrument : MS Painted Pipelines : Stainless Steel Weights : Stainless Steel / MS Phosphated Black     OPTIONAL ACCESSORIES Adaptors 1/8", 1/4", 3/8", 1/2" NPT Angle Connection (1/2" M x 1/2" F BSP) Pointer Puller & Pointer Punch Steel Carrying Box for Tester     ENVIRONMENTAL CONDITIONS Temperature : 23oC +/- 1oC Humidity : 50% +/- 10%     ACCURACIES AVAILABLE +/- 0.1% of reading taken +/- 0.05% of reading taken +/- 0.03% of reading taken

DW 10 SERIES      |      DW 20 SERIES      |      DW 30 SERIES