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KOHTECT BT-77, Operating Instructions Manual

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Summary of Contents for BT-77

Page 1: ...BT 77 Bearing Tester with Non Contact Tacho Operating Instruction Manual...

Page 2: ......

Page 3: ...ng Diagnosis Measurements 2 2 1 Selection and setting up the measuring points 2 2 2 Set up initial parameter taking bearing measurements 2 2 3 Taking bearing diagnosis measurement and save 2 2 4 File...

Page 4: ...KOHTECT BT 77...

Page 5: ...for Operation Operating temperature device sensor 10 to 55 5 Relative humidity 80 at temperature 30 Atmospheric pressure 84 to 106 7 KPa 630 800 mm Hg Resonance frequency 32 kHz Measurement unit dBi d...

Page 6: ...rrect lubrication all these factors cause the collision of the bearing elements and as a result acoustic oscillations of a wide spectrum are generated in the bearing body A specially designed transduc...

Page 7: ...mplitude over running the value of dBi dBsv features a damage and is used for the evaluation of bearing condition This enable BT 77 to tell the difference of shock pulse values induce is low shock and...

Page 8: ...um value At the measurements the bearing checker allows to filter out and measure two specified values of the shock acceleration amplitude the Carpet value dBc and the Max value dBm The dBc background...

Page 9: ...of the shock acceleration amplitude measurement for drives bearings can be influenced by shocks produced during the running in of a gear mesh which can be transferred onto the bearings However mostly...

Page 10: ...attery power supply socket for the measuring probe and USB port for tachometer sensors or file upload to PC for data management The controls and connectors location is shown on the Fig 1 2a Fig 1 2b F...

Page 11: ...y and Measuring Modes To switch ON the BT 77 bearing tester press The device perform self test as shown in Fig 2 1 and automatically enter the first default operation mode USB interface Fig 2 2 To con...

Page 12: ...account the following and see Fig3 3 Metal column between the probe tip and bearing must be if possible straight don t take readings from the cap that covers the bearing housing It is critical that t...

Page 13: ...the D input value and go to next setting parameters Screen will display RPM shaft rotating speed setting same using or key to set and press to confirm The display now shows Single Average or Contin se...

Page 14: ...t on machine place the probe firmly against the machine at the desired measurement location and ready to take reading Press and wait until bearing reading is displayed While taking the reading display...

Page 15: ...en data file for review press or to go to my documents screen and press to see file and directory as Fig 2 6 Press or to move cursor to data file with b77 extension and press to open for view 2 3 Eval...

Page 16: ...ts Bearing 3 is in good technical condition Condition of bearing 4 is getting worse after the measurement dated 15 03 90 the lubrication was replaced no positive results were shown it is advisable to...

Page 17: ...away to the mark surface this will decrease fault response from the surface of the shaft surface Use retro reflecting tape as a mark It is possible to use the correction fluid Stroke to apply the mar...

Page 18: ...of high frequency compression shock waves caused by mechanical impact Acceleration of material particles generates pressure or shock wave that propagates as ultra sonic frequency band through the obj...

Page 19: ...e moment when a bearing needs replacement Because of the very large dynamic range shock pulses are measured on a decibel scale Empirical tests showed that even the new and lubricated bearing generates...

Page 20: ...background of the bearing However under the work of the bearing the peak strikes have not only varying magnitudes but frequencies as well Fig 3 2 shows the typical examples of the evaluation of bearin...

Page 21: ...ncreasing dBc 10 even there are not any defects on the outer raceway of a the bearing The Max Value and the Carpet Value are relatively close dBm 30 dBc 20 4 Under pump cavitation both backgrounds fea...

Page 22: ...ble within some time interval bearing condition is acceptable 3 4 Method and measurement location of the bearings Shock pulse measurements should be completed on the bearing housing When free access t...

Page 23: ...Fig 3 3d 4 0 Delivery Set Description Qty Note 1 BT 77 w rechargeable battery inserted 1 2 Bearing Vibration measuring probe 1 3 IR Tachometer w mounting stand 1 4 AC Charger 220 230Volts 1 5 Liquid...

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