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| PB01053 Calibrator Gear Train Modification |
12/2/2004 |
Calibrator Gear Train Modification
As a result of field performance appraisals and internal testing being done concurrently by Hersey Meters, an opportunity to improve the performance of the Calibrator Gear Train has been identified. Tests have indicated that in atypical conditions deterioration of the bushings in the Calibrator may cause excess friction between the gears, which in extreme cases may result in the failure of the device.
After extensive testing in both the production facility and the field, Hersey Meters has determined that the failure rate of the Calibrator Gear Train, while low, is still unacceptable. Based on the results of ongoing field trails and endurance testing, it has been determined that several factors contributed to the failure modes that were encountered. Each of these factors has been addressed from the perspective of both performance and wear characteristics. Modifications are being implemented to enhance the robustness of the device. These modifications will begin immediately and include:
• Replacement of the current Teflon washer with a bushing made of a self-lubricating polymer which will improve wear characteristics and provide better radial support for the gears. Ongoing endurance testing has indicated that the implementation of all the identified modifications will greatly improve wear characteristics.
• Existing magnets will be replaced with magnets increasing the strength of the magnetic flux which will reduce the possibility that any decoupling could occur. Testing has indicated that in extreme conditions some failures can be attributed to the inability of the meter drive magnet to remain coupled with the Calibrator magnet.
As an additional precaution, Hersey will also begin using brass gears in all Calibrators as the current stock of aluminum gears is depleted or we receive their brass equivalents. This will be a running change and will be implemented over time as each of the aluminum gears is used up or the new brass gears are received for the various gear ratios in the devices. Performance of the Calibrator will be monitored and tracked to determine the long term benefits derived from this change.
Indicators of Calibrator Gear Train failure include the appearance of a dark powder or grit in the Calibrator and on the gears. This indicates failure of the current Teflon washer. Binding between the gears, when the magnet is turned by hand, is a result of this failure. Both of these indicators can be checked easily with a minimal amount of effort. If present, normal Product Complaint procedures should be followed. Hersey will evaluate returns and determine credits as the product is received. This problem has been identified in less than 1% of the installed base of this product. Should you have questions, please call Hersey Meters customer service group at 800-323-8584.
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| PB01050 Translator Encoder Register Order Form |
1/13/2004 |
The attached form is to be used for ordering Translator Encoder Registers and specifying electronic resolution of the registers.
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| PB01033 Wall Pad Installation Instructions |
2/24/2003 |
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| PB01049 TruRead Remote Visual Counter Installation Instructions Form |
1/13/2003 |
The attached form is to be used for the installation of TruRead Remote Visual Counters to Translator Encoder Registers
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| PB01026 Pit Pad Installation |
12/18/2002 |
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| PB01005 AMR Systems Definition |
6/13/2002 |
AMR (Automatic Meter Reading) is a widely used term to automate just about any part of the Meter Reading process. To most, it is how the readings are collected. Reading automation is, entering visual reading into a handheld computer up to and including receiving the readings via a fixed network with many options in between
To view the complete discussion about AMR technology.
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