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  • Automated letter sorting machinery with many small spindles & motors on each base-plate
  • MHC-Memo allows a single base-plate measurement to quickly detect a single defective component
  • MHC-Memo units bought for all automated letter sorting sites
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Condition Monitoring Solutions for The Royal Mail

Conveyor belt
Since 1993, the Royal Mail has been actively developing new Condition Monitoring techniques for their automated letter sorting machinery. Vibration techniques were ineffective for this application due to the complex nature of the machines, which have many spindles and drives mounted in close proximity on a common base-plate. By contrast, trials carried out by both the Royal Mail Technology Centre and key sorting offices including the Oxford MLO showed that the MHC high frequency AE technique was capable of readily providing global monitoring of entire base-plates.
Postal machine
As part of a country-wide implementation of TPM, the Royal Mail made the decision to equip all its automated letter sorting offices with portable AE based monitoring instruments. A request for tenders was published in the appropriate European publications dealing with GATT notices. In response to this request Holroyd proposed the newly developed MHC - Memo Pro, a route mode data collector version of its well proven MHC instrument.
After a thorough evaluation of the various proposed systems, the Royal Mail selected the MHC - Memo Pro and a contract was placed for Kittiwake Holroyd to supply 58 units, each complete with a range of accessories. (INFORMATION COURTESY OF THE ROYAL MAIL)

The Royal Mail contract is the latest in a string of successes where our AE based instruments have been selected because their superior performance, ease of use and simple interpretation enable cost-effective Condition Based Maintenance to be rapidly implemented”. Dr Trevor Holroyd

The Equipment
MHC Memo and sensor
The MHC-MEMO characterises the detected signal in terms of Distress® and dB Level. Distress® is a proprietary parameter which records all the microscopic clicks, crunches, whistles and groans associated with faults, providing a way of recognising suspect machinery at an very early stage. By contrast, dB Level is a measure of the overall signal level and is used to trend the rate of degradation of suspect machinery.
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