200 C Street, SW
Washington, DC 20204
M-b-303 Supplement I
December 1, 1992
TO: All Regional Food and Drug Directors
Attn: Regional Milk Specialists
FROM: Milk Safety Branch (HFF-346)
SUBJECT: Taylor ERC Field Modifications
Over the last several months we have received rare but troubling reports of unusual occurrences with regard to the function of Taylor ERC Safety Thermal Limit Recorder-Controllers used on HTST pasteurization systems.
These include pen spiking, flow diversion valves "locking" in forward flow and display and/or pen drift.
The cause of these problems has been investigated and found to be "noisy" electrical signals in the current received by the ERC.
We have received a letter from Mr. Steven Frate of the ABB Kent Taylor Company detailing the causes of these problems and their company's proposed solutions.
We have reviewed this letter and believe it to be an accurate description of both the problem and the solution.
All units manufactured since February 1, 1992 now contain the capacitors, inline filters, and resistors and include the minor internal adjustmentsin determining which units are older and may need to receive this additional needed to implement the ABB Kent Taylor proposed solution.
The letter also describes what is required to modify older units to eliminate these same concerns.
We recommend that older units be so modified.
Also enclosed is a list of the new catalog numbers. This may be of assistance power supply protection.
Modification parts and installation instructions and/or assistance is available from ABB Kent Taylor stocking representatives - a map showing which representative services your area is enclosed. Additional technical questions regarding these corrective measures may be addressed to:
ABB Kent Taylor Company
1175 Johns Street
Rochester, New York 14692
Copies of this memorandum with attachments are enclosed for distribution to state milk sanitation regulatory agencies and state milk rating officers in your region.
Steven T. Sims