IMI Industrial Vibration Sensors Katalog Seite 126

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Inhalt

Output 4 20 mA Machinery RPM Range 150 to 4 800 cpm 2 5 to 80 Hz 2 5 to 80 Hz 10 Sampling Time 0 2 to 6 4 sec Weighting Factor 0 1 to 20 mA Peak Coupling Current Range 4 to 20 mA Shock Threshold Limit 2 to 50 g Environmental Temperature Range 40 to 212 F 40 to 100 C Storage Temperature Range 40 to 257 F 40 to 125 C Electrical Excitation Voltage 15 to 30 VDC Load Resistance 50 Vs 15 ohm Electrical Isolation 108 ohm Physical Size Hex 1 25 in 1 375 in 32 mm 35 mm Size Height 2 60 in 5 8 in 66 mm 147 mm Size Width N A 3 85 in 98 mm Weight 7 oz 1 1 lb 198 gm 500 gm Mounting Thread 1 4 28 UNF 1 4 NPT Mounting Torque 3 to 5 ft lb N A 4 to 7 N m Sensing Element Piezoelectric Accelerometer Housing Material Stainless Steel Sealing Welded Hermetic N A Electrical Connector MIL C 5015 Top Electrical Connections Pin A 4 20 mA Pos Electrical Connections Pin B 4 20 mA Neg Overload Limit Shock 5 000 g pk 49 050 m s2 pk Screw Terminal Wire Size N A 12 24 AWG 3 0 2mm Conduit Housing Thread N A 1 NPT Female Supplied Accessories Model 081A41 Mounting stud 1 4 28 socket head set screw brass tip stainless steel 5 8 long 1 Notes All specifications are at room temperature unless otherwise specified 1 For CE reference PCB Declaration of Conformance PS039 or PS053 for details 2 AEx ia IIC T4 3 AEx nA IIC T4 4 Class I Div 1 Groups A B C and D Class II Div 1 Groups E F and G Class III Div 1 5 Class I Div 2 Groups A B C D 6 Ex ia IIC T4 II IG 7 Ex ia IIC T4 8 Ex nL IIC T4 II 3 G 9 Ex nL IIC T4 10 1Hz 60 cpm cycles per minute Impact Detection Preventing Failure Although overall vibration trending is an excellent tool for monitoring the health of rotating machinery it is not generally effective for monitoring reciprocating machinery Since impacts generally have little effect on overall vibration level common faults are not detected at an early stage As a result abnormalities are not diagnosed until damage has occurred and it is too late to take simple corrective measures There are several reciprocating machinery faults which do not significantly increase a machine s overall vibration level until damage has reached a severe level including loose or broken bolts excessive clearance in connecting pins loose or cracked rod nuts liquid or debris in the cylinder cracked connecting or piston rod scoring in the cylinder excessive crosshead slipper clearance and other broken parts The patented IMI Sensors Reciprocating Machinery Protector RMP Model 649A01 US Patent 7 171 313 is very sensitive to these faults in their early stages of development For this reason the RMP is particularly effective in monitoring reciprocating compressors Model 649A01 is a loop powered device which detects mechanical shock events occurring in or near the machine s cylinder assembly The Reciprocating Machinery Protector continuously outputs the peak acceleration value as long as there is no fault condition detected When a threshold is exceeded the RMP recognizes a potential fault condition and accurately outputs a computed Reciprocating Fault Index RFI proportional to the severity of the fault With configurable speed parameters adjustable sampling time and ability to customize alarm levels the RMP is a powerful tool for reciprocating machinery protection Photo Courtesy of Lone Star Com pressor Optional Versions EX Hazardous Area Approval Contact factory for specific approvals For Models 649A01 EX649A71 M Metric Mount For Models 649A01 EX649A71 Reciprocating Machinery Protector visit us online at www imi sensors com 1 716 684 0003 123 Technical Specifications Model Number 649A01 EX649A71 Performance Accessories Cables Pages 146 159