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ADHESIVE MOUNTING  BUSHINGS

 

 

An adhesive mounting bushing may be 
bonded  to  an  object  so  that  the 
accelerometer may be screwed into the 
bushing rather than into the object being 
measured.  This is appropriate for those 
applications  where  it is  not  practical to 
drill into an object  for stud mounting. It is 
also appropriate for applications where it 
is anticipated that the accelerometer will 
need to be removed periodically. 
 
The  bushings  may  be  welded  or 
adhesively  bonded  in  place.  Care 
should  be  taken  when  bonding the 
bushings to make certain no adhesive is 
allowed  to  seep  into  the  bushing's 
mounting hole. 
 

This can be avoided by  threading the accelerometer or a  dummy bolt

  i

nto  the 

bushing before bonding It  to the surface.  Additional  care  should be  taken to 
prevent  uncured adhesive  from  being  drawn  up  through  the  hole  when  the 
accelerometer or bolt is removed.

 

 

 

MAGNETIC MOUNTING

 

 

Magnets are not generally recommended for measurements above 5KHz. They 

are quite adequate for lower frequency measurements and can be helpful when 
a  single  accelerometer is  used to measure  a  great  number  of  points.  The 
obvious  requirement is that the measurement point must be ferro-magnetic  so 
that the magnet can stick to 

it.

 

 

A flat magnet with smooth machined surfaces and perpendicular mounting hole 
is recommended.  This  allows  the magnet to bond efficiently to the  mounting 
surface  providing good  dynamic  transmissibility.  For  those points  where  the 
magnet  does  not  seat  well,  it  may be  necessary  to bond a  sizeable  ferro-
magnetic bushing.  Note  that most  adhesive mounting  bushings are  made  of 
Series 300 stainless steel which will  not rust and is not ferro·magnetic.

 

 

As with other mounting techniques,  a thin film of grease can be used to enhance 

the dynamic transmissibility when using a magnet.

 

 

Using  horse-shoe  (or  U-shaped)  magnets  on  curved  surfaces,  although 
popular, should be restricted to measurements below 1 KHz. See figure 7-3 for 
an example of magnetic mounting. 

 

 

 

Figure 7-2.   Adhesive 

Mounting Bushing

 

Summary of Contents for ACC101

Page 1: ...e mail info omega com For latest product manuals www omegamanual info Shop online at omega comSM User sGuide ACC101 ACC102A ACC103 ACC301A ACC310 ACC320 Accelerometers...

Page 2: ...rves the right to alter specifications without notice Servicing North America U S A Omega Engineering Inc Headquarters Toll Free 1 800 826 6342 USA Canada only Customer Service 1 800 622 2378 USA Cana...

Page 3: ...TS 5 Power Supplies 5 SECTION 5 CONNECTOR WIRING 7 Coaxial Connectors 7 Two Pin Connectors 7 Four Pin Connectors 7 SECTION 6 CABLING TECHNIQUES 8 Splicing and Extending Cables 8 Securing Cables 8 SECT...

Page 4: ...jj...

Page 5: ...pment inspect the container and equipment for any signs of damage Take particular note of any evidence of rough handling in transit Immediately report any damage to the shipping agent NOTE The carrier...

Page 6: ...r case The materials and physical construction used iIn an accelerometer design are selected to furnish the particular performance characteristics desired For more information about the construction o...

Page 7: ...will provide years of reliable trouble free service NOISE IN ACCELEROMETERS Electrical Grounding An accelerometer may be designed with the output signal ground either connected to the case of the acce...

Page 8: ...the accelerometer will transduce shock and vibration that is input normal to the accelerometer s mounting base It shouldbe noted that the accelerometer will have some sensitivity to motion in the othe...

Page 9: ...celerometer Is not over powered POWER SUPPLIES If the data acquisition system being used does not incorporate its own power supply then a separate power supply must be used OMEGA manufactures single c...

Page 10: ...ow Impedance Wiring Directly to Instrumentation For those applications where the data acquisition system does not supply the constant current power an external power supply must be used Essentially th...

Page 11: ...l connectors are wired The result Is that the two pins correspond to the center conductor and shield of a coaxial accelerometer The two pin configuration lends itself to be wired with either coaxial c...

Page 12: ...ypically low impedance devices are not affectedby sharp cable bends or cable motion Figure 6 1 Cable Routing and Securing SPLICING EXTENDING CABLES Common sense and care should be used when splicing a...

Page 13: ...or noise source Letting a connector which is signal common touch ground can cause ground loop noiseInterjection When working with permanently routed cable systems it is recommended that the splices be...

Page 14: ...have a mounting stud protruding from the bottom of the unit This stud may or may not be removable depending upon the model When attaching the accelerometer with the mounting stud you should make certa...

Page 15: ...s lend themselves to be adhesively bonded to an object Temporary bonds can be achieved with many different tacky adhesives beeswax or cyanoacrylate type cements such as Krazy Glue These types of bonds...

Page 16: ...ets are not generally recommended for measurements above 5KHz They are quite adequate for lower frequency measurements andcanbe helpfulwhen a single accelerometer is used to measure a great number of...

Page 17: ...13 Figure 7 3 Magnetic Mounting...

Page 18: ...g and 105mV g The actual sensitivity for each unit is verified at 100 Hz and recorded on the accelerometer s calibration certificate BASIC FREQUENCY RESPONSE The frequency response specification for...

Page 19: ...y 1 Temperature Range 10 to 200 F 20 to 95 C Transverse Sensitivity 5 Shock Limit 5 000 g pk Mounted Resonant Frequency 18 kHz Output Impedance 100 ohms Bias Voltage 12 VDC typ Base Strain 250 in in 0...

Page 20: ...0 to 200 F 20 to 95 C Transverse Sensitivity 5 Shock Limit 5 000 g pk Mounted Resonant Frequency 18 kHz Output Impedance 100 ohms Bias Voltage 12 VDC typ Base Strain 250 in in 001 g pk in in typ Noise...

Page 21: ...ity 2 Temperature Range 40 to 250 F 40 to 121 C Transverse Sensitivity 5 Shock Limit 5 000 g pk Mounted Resonant Frequency 50 kHz Output Impedance 1000 ohms Bias Voltage 7 VDC typ Base Strain 250 in i...

Page 22: ...e Range 40 to 250 F 40 to 121 C Transverse Sensitivity 5 Shock Limit 5 000 g pk Mounted Resonant Frequency 25 kHz typ Output Impedance 1000 ohms Bias Voltage 7 VDC typ Base Strain 250 in in 005 g pk i...

Page 23: ...ty 1 Temperature Range 40 to 250 F 40 to 121 C Transverse Sensitivity 5 Shock Limit 5 000 g pk Mounted Resonant Frequency 40 kHz Output Impedance 100 ohms Bias Voltage 12 VDC typ Base Strain 250 in in...

Page 24: ...Temperature Range 40 to 250 F 40 to 121 C Transverse Sensitivity 5 Shock Limit 5 000 g pk Mounted Resonant Frequency 18 kHz Output Impedance 100 ohms Bias Voltage 12 VDC typ Base Strain 250 in in 005...

Page 25: ...21 NOTES...

Page 26: ...therwise shall not exceed the purchase price of the component upon which liability is based In no event shall OMEGA be liable for consequential incidental or special damages CONDITIONS Equipment sold...

Page 27: ...ine Paddlewheel Systems M U Totalizers Batch Controllers pH CONDUCTIVITY M U pH Electrodes Testers Accessories M U Benchtop Laboratory Meters M U Controllers Calibrators Simulators Pumps M U Industria...

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