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User Manual
Model BL510 Portable Deadweight Tester

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Summary of Contents for BL510

Page 1: ...User Manual Model BL510 Portable Deadweight Tester ...

Page 2: ...regulations plus the safety instructions provided in the operating instructions are complied with We do not accept liability for any damage caused by improper use or incorrect operation Please ensure that all persons operating the device have read and understood the operating instructions Keep these operating instructions in a safe place so that they are accessible at all times when needed If you ...

Page 3: ...ENTS 8 4 SETTING UP THE DEADWEIGHT TESTER 10 5 OPERATING THE DEADWEIGHT TESTER 12 5 1 Preparation 12 5 2 Pressure Transforming Media 12 5 3 Operation 12 6 MAINTENANCE 14 6 1 Cleaning and service tips 14 6 3 Oil changes 14 6 4 Maintenance schedule 15 7 TROUBLESHIOOTING 16 ...

Page 4: ...nsistent accurate results 1 2 Application Primary Pressure Standard in lab or site Secondary Reference Pressure Standard in lab or site 1 3 Operating Principle A deadweight tester is based on a high accurate manufactured piston and cylinder assembly This cylinder is mounted in a column The piston can rotate and freely move up and down Accurately calibrated masses are loaded on top of the verticall...

Page 5: ...the top of the sealing of the pressure connection If the weight set is marked with a pressure unit MPa bar psi or kg cm the pressure can be determined by the formula P m g 1 ρa ρm So 1 λPo 1 αp αc t 20 Where is P Measurement pressure Pa MPa m Mass kg g Standard gravity 9 80665 m s or customized local gravity ρa The density of the ambient air at the reference level of the deadweight tester the typi...

Page 6: ...essure distortion coefficient piston cylinder MPa Example the piston and cylinder is tungsten carbide material cylinder outside diameter is 22 mm cylinder height is 30 mm piston length is 38 mm the λ value as below Part Number Pressure Range Piston Diameter Piston Area λ value of tungsten carbide KY0 6 0 04 0 6 MPa 11 28 mm 1 cm2 Negligible KY1 0 04 1 MPa 11 28 mm 1 cm2 Negligible KY6 0 1 6 MPa 5 ...

Page 7: ...sters the effective area is determined by cross floating with a known reference primary standard deadweight tester The exact pressure can be calculated As per the formula of the item 1 4 compensation factors are listed for air buoyancy local gravity surface tension of the used oil and temperature and pressure expansion of the piston cylinder assembly All necessary data are listed in the calibratio...

Page 8: ...teel optional Sealing ring material Buna N Fluid Mineral oil Sebacate 25MPa water please contact with us in prior Working ambient temperature 15 25 Gravity Standard 9 80665 m s2 or customize local gravity value Engineering units MPa bar psi kg cm2 Certificate CNSA calibration traceable Pressure connector M20x1 5 female BSP or NPT is optional Dimension 300 x 320 x 260 mm Tester net weight 12kg with...

Page 9: ... 70 MPa 2MPa kg 0 05 cm2 35 kg KY100 1 100 MPa 2MPa kg 0 05 cm2 50 kg 2 3 Mass quantity and measuring range Part Number Pressure Range Piston and Bell Mass quantity and measuring range KY0 6 0 04 0 6 MPa 0 04MPa 10 x 0 05MPa 6 x 0 01MPa KY1 0 04 1 MPa 0 04MPa 11 x 0 5MPa 4 x 0 1MPa KY6 0 1 6 MPa 0 1MPa 11 x 0 5MPa 4 x 0 1MPa KY25 0 5 25 MPa 0 5MPa 11 x 2MPa 5 x 0 5MPa KY60 1 60 MPa 1MPa 11 x 5MPa ...

Page 10: ...Page 7 2 4 Instrument Outline Remark No priming hand pump and Float indicator for low pressure ranges 25MPa ...

Page 11: ...whenever testers are being used for instrument calibration Because a leak in the tester s high pressure line can release an explosive mist of oil proper fire extinguishers should be immediately available Pre load the tester s piston with weights before applying pressure to the gauge Otherwise shock from the pressure can dislodge the piston retainer ring allowing the piston to fly out of the tester...

Page 12: ...ocedure is to create a small leak minimizing the volume of oil that will enter the interconnecting tubing Hydraulic Fluid such as Shock absorber brake fluid or transmission fluid may not be substituted for the hydraulic oil specified for the instrument Never touch the cleaned piston with your bare hands The natural dermal grease can cause a jamming of the piston cylinder system Never press the pis...

Page 13: ...L510 portable deadweight tester should be placed on a rugged table which is rated for at least 140 kg without deforming The table should be horizontally leveled Room temperature needs to be stable between 23 2 C during the time the BL510 portable deadweight tester is used to avoid uncertainties due to the thermal expansion coefficients of the piston cylinder and adiabatic effects in the measuring ...

Page 14: ...O ring located in the center position of cylinder base the deadweight tester Screw the whole piston cylinder unit in cylinder base of the deadweight tester If necessary uses wrench to tight it till mechanical stop Do not open the piston and cylinder unit by unprofessional people In generally the factory installed the piston and cylinder unit on the base before delivery ...

Page 15: ...feet 5 2 Pressure Transforming Media 25MPa Mineral Oil Miglyol 812 Noil or equivalent oil with viscosity grade VG22 25MPa Sebacate Oil 5 3 Operation 1 Turn fine control screw press counter clockwise till end of its stroke open vent valve oil drain valve 2 Unscrew quick connector plug screw the device under tester DUT opens cut off valve 3 Calculate the weight s pressure and related quantities ...

Page 16: ... read the value 6 After read the 1st pressure test point use fine control screw press to decrease the pressure plus the other calculated mass sets and increase the pressure again rotates the table to test next pressure test point The test of rest of pressure points is same as this method 7 For down process measurement decline the pressure with fine control screw press slowly Reduces the calculated...

Page 17: ...ed cloth to avoid altering the mass of the weights 6 Avoid contaminating the instrument with dust and grit preventing unnecessary wear of moving parts Contamination of the oil in the system will accelerate piston and cylinder wear and degrade instrument accuracy 7 Ensure that high pressure fittings of the instrument are tight when operating the instrument indoors 8 Remove the piston and cylinder f...

Page 18: ...to minimize friction and lubricate the piston Therefore some leakage past the piston is normal and necessary A moderate escape of oil can be controlled by adding heavier oil Excessive leakage or blowing of oil past the piston indicates excessive wear of the assembly and requires replacement of the assembly If the model and serial numbers of the instrument are furnished the piston and cylinder asse...

Page 19: ... pressure Damaged Cylinder O Ring Unscrew the piston cylinder unit from cylinder base replace O Ring Not sensitive to small weight changes when used to determine unknown gas pressure Over tightened cylinder cap nut Unscrew cap nut re tighten only until snug Dirty oil Remove oil clean reservoir with solvent fill reservoir with clean oil Damaged Piston Remove piston cylinder as per above Damaged O R...

Page 20: ... Excessive oil leakage at piston Damaged cylinder O Ring Replace O Ring Oil too light Check and remove fluid in reservoir if it is shock absorber or brake fluid Replace with mineral oil or sebacate Worn piston cylinder assembly Replace with new Piston Cylinder Unit Not sensitive and or inaccurate operation during hydrostatic testing Water emulsifying with tester oil Best Use synthetic oil instead ...

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