Thayer Scale, Pembroke, MA, has received a Certificate of Conformance (CC) covering its Model NAR 4 and 6 Idler Belt Scales for applications on conveyor belts of 18 to 96 in. wide, operating at belt speeds between 100 and 1000 ft/min, under loading of 34 to 340 lb/ft, at flow rates of 102 to 10,200 T/hr.
The Model NAR family uses the same "graded sensitivity" weighbridge that has been used by the company for commercial applications for over 30 years. It is particularly well suited for applications involving high belt speeds (>600 fpm) and steep inclines (>12 degrees).
The concluding six-month "sealed" permanence test was done at Duke Energy’s Buck Power Station, Spencer NC, handling coal at 4800 T/hr on a 72-in.-wide conveyor running at 700 ft/min at a 15 degree incline. Three material tests were run at that time, with no adjustment made to the zero between each of the tests. Results were -0.076%, +0.035%, and +0.089%, comfortably within the allowable +/-0.25%.
The National Type Evaluation Program (NTEP) is a program of cooperation between the National Conference on Weights and Measures (NCWM), the National Institute for Standards and Technology (NIST), State Weights & Measures Officials, and the private sector for determining conformance of weighing equipment with the provisions of Handbook 44. NTEP provides the testing procedures for each type of device, oversees its testing, and issues a Certificate of Conformance (CC) upon acceptance. The range of operating parameters that a family of devices covered by a single CC can have is restricted and noted on the certificate.