IMI Industrial Vibration Sensors Katalog Seite 167

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Accelerometer Selection Guidelines Typical Ceramic Accelerometer Temperature Response Typical Quartz Accelerometer Response Top Requires More Clearance 5 Size In many cases the style of the sensor used can be restricted by the amount of space that is available on a machine to mount the sensor There are typically two parameters that govern which sensors will fit the footprint and the clearance The footprint is the area covered by the base of the sensor The clearance is the height above the surface required to fit the sensor and cable As an example a top exit sensor will require more clearance than a side exit model Footprint hex length width and clearance height values are provided in this catalog Space Constraints Select a sensor that will fit into the space that is available Basic dimensions are provided in this catalog for that purpose Caution Before machining any surfaces or tapping any holes contact IMI for a current installation drawing One of the main reasons for different accelerometer designs top exit side exit swivel mount etc is the need to fit the accelerometer into a particular space on a machine For example top exit models are typically more cost effective than side exit models but require much more clearance space than side exit models Orientation Cable orientation is another consideration Ring style side exit models can be oriented 360 however in some very tight spaces even these may be difficult to install For example there may not be enough height clearance to fit a wrench to tighten the unit In that case a Series 607A swivel mount style accelerometer may be required 4 Temperature Range Determine the highest and lowest temperatures that the sensor will be subjected to and verify that they are within the specified range for the sensor Temperature Transients In environments where the accelerometer will be subjected to significant temperature transients quartz sensors may achieve better performance than ceramic Ceramic sensing elements are subject to the pyroelectric effect which can cause significant changes in the sensitivity and result in erroneous outputs with changes in temperature These outputs typically occur as drift very low frequency and usually cause significant ski slope in the velocity spectrum Accelerometer temperature response curves as shown below are provided throughout this catalog If temperature transients are suspected refer to these graphs Side Exit Accelerometer Swivel Mount Accelerometer Cable rotates into any desireable position Floating hex secures sensor to base mounting stud Black Ground Red Sig Pwr 4 3 in 109 mm Typical Bending Radius 10 ft 3 m Integral Cable 7 8 Hex 1 4 28 Mounting Hole Ø0 087 in Ø22 1 mm 4 4 in 112 mm Typical Bending Radius 1 0 in 25 4 mm Ø1 38 in Ø35 1 mm 1 4 28 Mounting Bolt 10 ft 3 m Integral Cable Blue Ground Red Sig Pwr 164 visit us online at www imi sensors com 1 716 684 0003