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User Manual
Model BL506 Vacuum Deadweight Tester

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Содержание BL506

Страница 1: ...User Manual Model BL506 Vacuum Deadweight Tester ...

Страница 2: ...gulations 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 re...

Страница 3: ...REMENTS 9 4 SETTING UP THE DEAD WEIGHT TESTER 11 5 OPERATION 16 5 1 PREPATATION 16 5 2 VACUUM CALIBRATION OPERATION 16 5 3 PRESSURE CALIBRATION OPERATION 21 6 MAINTENANCE 25 6 1 PISTON DISASSEMBLY 25 6 2 PISTON CLEANING 25 6 3 PISTON RE ASSEMBLY 26 7 TROUBLESHOOTING 27 ...

Страница 4: ...st a little swing of the masses 1 2 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 vertically mounted piston A pressure is applied on the bottom of the piston to lift the piston with masses This c...

Страница 5: ... air at the reference level the typical air density value is 1 2 kg m ρ2 The density of mass ρ value of stainless steel 7 93x10 kg m3 ρ value of carbon steel 7 8x103kg m3 So Effective area at zero pressure t 20 m λ Pressure distortion coefficient piston cylinder system MPa Po It is the pressure value when piston system doesn t be deformed can be instead by P MPa α1 Thermal expansion coefficient of...

Страница 6: ...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...

Страница 7: ...m H x 650mm L x 500mm D Pump dimension 225mm H x 455mm L x 380mm D Tester weight Appro 25kg Pump weight Appro 15kg Recalibration Every 2 5 years 2 2 PRESSURE RANGE SELECTABLE SHEET P N Pressure Accuracy Area Kn factor Mass Set KYQZ100 100 100 kPa 0 05 0 02 0 01 0 005 10cm2 10kPa kg 10kg 10kg KYQZ160 100 160 kPa 0 05 0 02 0 01 0 005 5 cm2 20kPa kg 5kg 8kg KYQZ250 100 250 kPa 0 05 0 02 0 01 0 005 5 ...

Страница 8: ...essure 10kPa 5kPa 5kPa 10kPa 20kPa Pieces 9 2 2 5 5 KYQZ250 100 250 kPa 5kPa Pressure 10kPa 5kPa 5kPa 10kPa 20kPa 50kPa Pieces 9 2 2 2 1 4 KYQZ400 100 400 kPa 5kPa Pressure 10kPa 5kPa 5kPa 10kPa 20kPa Pieces 9 2 2 15 12 KYQZ600 100 600 kPa 5kPa Pressure 10kPa 5kPa 5kPa 10kPa 20kPa 50kPa 100kPa Pieces 9 2 2 2 1 1 5 KYQZ1M 100 1000 kPa 5kPa Pressure 10kPa 5kPa 5kPa 10kPa 20kPa 50kPa 100kPa Pieces 9 ...

Страница 9: ...Page 6 2 4 SCOPE OF DELIVERY ...

Страница 10: ...Page 7 2 5 INSTRUMENT OUTLINE FOR VACUUM DEADWEIGHT TESTER BASE ...

Страница 11: ...Page 8 2 6 INSTRUMENT OUTLINE FOR MANUAL PUMP ...

Страница 12: ...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...

Страница 13: ...l must wear reinforced safety shoes to prevent injury Before bleeding pressure from the tester the valve at the pressure source should be closed The instrument s pressure should then be slowly bled to atmosphere If a vent valve is unavailable the fitting at the tester should be carefully and slowly loosened This procedure is to create a small leak minimizing the volume of oil that will enter the i...

Страница 14: ...e pump on a firm level base make the bubble level in the middle position by adjusting the three bottom feet of vacuum deadweight tester 4 2 Remove the bell jar from the vacuum deadweight tester base check whether the sealing ring in the groove Make sure the sealing ring is not aged or broken If not please replace it with new one ...

Страница 15: ...R FINGER TO TOUCH THE PISTON SUFACE The natural dermal grease can cause a jamming of the piston cylinder system 4 4 Use hand to screw out the knurled pressure cap of piston cylinder unit check whether if the internal seal ring is in good condition Make sure the sealing ring is not aged or broken If not please replace it with new one ...

Страница 16: ... THE PISTON SURFACE The natural dermal grease can cause a jamming of the piston cylinder system 4 5 Put the cylinder into the base with the lettered end facing up as following left picture hand tight the knurled pressure cap to the mechanical stop on the outside of the cylinder as following right picture ...

Страница 17: ...olding the piston by the larger head end carefully introduce the piston into the underside of the cylinder and push gently through as following left picture Never force the piston into its cylinder or damage will result Fully tight and three bottom dowel screws as following right picture ...

Страница 18: ... port negative port with flexible connection hose between vacuum deadweight base and manual pressure pump as following left picture Connect the electric vacuum pump with manual hand pump with flexible connection hose as following right picture ...

Страница 19: ...on of the deadweight tester as this results in unpredictable errors Room temperature needs to be stable between 23 2 C during the time the deadweight tester is used to avoid uncertainties due to the thermal expansion coefficients of the piston cylinder and adiabatic effects in the measuring system Air movement around the deadweight tester should be avoided Check if the bubble level is in the cente...

Страница 20: ...e check whether the sealing ring is in the groove Make sure it is not aged or broken If not please replace it with new one Step 3 Carefully take out the piston cylinder unit from the vacuum base put it on the table carefully DO NOT USE YOUR FINGER TO TOUCH THE PISTON SUFACE ...

Страница 21: ...otection tube left direction is to loose and put it on the table Step 5 Place the piston vertically and carefully DO NOT USE YOUR FINGER TO TOUCH THE PISTON SUFACE The natural dermal grease can cause a jamming of the piston cylinder system ...

Страница 22: ...ump Push the pressure vacuum switch inside on the manual pressure pump Put the bell jar on the base Step 7 Install the unit under test UUT on the one of three quick connectors close the vent valve open the shut off valve closes the isolation valve for electric vacuum pump Put the first calculated mass on the mass carrier ...

Страница 23: ...acuum till the piston goes up rotate the piston clockwise direction Use wheel pressure regulator to fine adjust the desired vacuum make sure the piston is between the two piston position make lines on the bell jar Step 13 Repeat the step 11 12 till the measure vacuum to 95kPa Step 14 For 100kPa vacuum we need the help from electric vacuum pump EVP Open the isolation valve of EVP power on the EVP t...

Страница 24: ...the piston to make sure its position is in the range of two mark lines on the bell jar records the measuring value Step 16 Repeat the step 15 to finish the rest of calibration points in the down process 5 3 PRESSURE CALIBRATION OPERATION Step 1 Calculate the weight s pressure and related quantities Step 2 Check if the bubble level is in the center if not level the instrument with the 3 adjustable ...

Страница 25: ...htly DO NOT USE YOUR FINGER TO TOUCH THE PISTON SUFACE The natural dermal grease can cause a jamming of the piston cylinder system But user can touch the thin pole when the piston is needed to rotate or handle Step 5 Hand tight the piston protection tube right direction is to screw inside ...

Страница 26: ... under test UUT on the one of three quick connectors of manual hand pump close the vent valve open the shut off valve and close the isolation valve for electric vacuum pump Use flexible hose to connect the positive port on the vacuum deadweight tester to the manual pressure pump Pull the pressure vacuum switch outside on the manual pressure pump make sure the applied pressure will be positive pres...

Страница 27: ...operation is for up process of pressure calibration For down process pressure calibration firstly take off one weight open the vent valve to release the air slowly Quickly close the vent valve if it is closing the desired value Use wheel pressure regulator to fine adjust the pressure rotate the piston to make sure its position is not ahead of the marked step on the pressure cap Close the shut off ...

Страница 28: ...non fluffing non abrasive lint free tissue or absorbent cloth Hold the piston by the larger head end and rub the tissue back and forth along its length 2 To remove all traces of contamination the piston can be cleaned in a suitable solvent 3 After removal from the solvent using a NEW tissue repeat the cleaning procedure in step 4 4 Place piston carefully on a NEW tissue where it will not be damage...

Страница 29: ...g the piston still will not slide freely within the cylinder then permanent damage may have occurred In which case the parts should be returned to the factory for evaluation or replacement 2 Stand assembly upright on a clean hard stable surface ensure that the mass carrier is clean especially the central mounting hole and place on the tapered end of the piston Tap lightly using the palm of the han...

Страница 30: ...mmediately Do not rotate the piston if it is dirty as permanent damage can occur If the spin sensitivity of a recently cleaned PCU deteriorates quickly then it is likely that the hydraulic or pneumatic system has become contaminated If this is the case the system must be completely dismantled thoroughly cleaned and rebuilt before further calibration is carried out During the normal operation of a ...

Страница 31: ...losed and test port connections are correctly made 2 The DUT may be leaking This can be verified by recording the fall rate and comparing it with the fall rate under the same conditions but with the DUT removed and the test port blanked off 3 If the system has been pressurized quickly then sufficient time must be allowed for the instrument to thermally stabilize Continue re floating the piston unt...

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