Ordinary vibration monitoring cannot 'hear' knocks or impacts within a reciprocating compressor due to the speed and duration of the 'impact'.
The Metrix model IT6810 Impact Transmitter uses new technology to measure impact severity on reciprocating machinery. Impact is a proven method of detecting mechanical looseness on large reciprocating compressors.
The impact transmitter combines the benefits of this measurement with the convenience of 4-20 mA loop powered sensor technology. It has a built-in piezoelectric crystal sensing element, and uses a timing function as part of its severity determination. An impact event counter and memory device is used to record events meeting a preset amplitude threshold level. The 4 to 20 mA signal represents the number of impact events above the threshold level that occur within a preset time window called the reset time. Mechanical impacts are both measured and qualified within the transmitter. The result is a current output proportional to impact severity.
The model IT6810 Impact Transmitter detects the following: loose rod nuts; cracked rod; broken or loose bolts; liquids in the process; loose or worn gudgeon pins; excessive clearance in the slipper; and other loose or broken parts.
Typically the IT6810 is mounted on the cross-head or spacer of the compressor.
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