Portable or Self-Contained Scale Requirements

PURPOSE: This rule covers the installation of portable or selfcontained scales for use in semi-permanent locations for less than one hundred eighty days. (1) Portable or self-contained scales may be used commercially for weighing soil, lime, gravel, sand, cement, and other building material when installed in accordance with the original scale manufacturer’s recommendations. (2) Approaches to Portable or Self-Contained Scales. (A) Approaches shall be at least the width of the platform, at least one-half (1/2) the length of the platform but not required to be more than forty feet (40') and not less than ten feet (10') of any approach adjacent to the platform shall be constructed to insure that this portion remains smooth and level and in the same plane as the platform. Any slope in the remaining portion of the approach shall ensure ease of vehicle access, ease for testing purposes, and drainage away from the scale. (3) The indicating element shall be in a weatherproof housing and shall not be openly exposed to the elements. All mechanical indicators shall be mounted on a concrete pier or slab. (4) Tolerances shall be as defined in the current edition of NIST Handbook 44 for commercial weighing devices. All scales represented as complying with this rule shall meet all of the standards specified and all applicable specifications and performance requirements of the current edition NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices. (5) Sides of the scale are not required to be enclosed unless the scale is located in an area where air currents will affect weighments. (6) Requirements of section 413.175, RSMo must be met prior to the actual installation of devices covered in this rule. Following installation, any device covered in this rule must be calibrated and placed in service by a registered Missouri scale serviceman or officially examined by Missouri Weights and Measures Division before the device can be used in commercial service. (7) If any provision of these rules is declared invalid, the validity of the remainder of these rules shall not be affected. AUTHORITY: section 413.065, RSMo Supp. 1997.* Original rule filed Dec. 30, 1975, effective Jan. 9, 1976. Rescinded: Filed Nov. 14, 1977, effective April 13, 1978. Readopted: Filed April 22, 1981, effective Sept. 11, 1981. Amended: Filed Jan. 15, 1985, effective April 11, 1985. Amended: Filed April 11, 1994, effective Sept. 30, 1994. Amended: Filed Nov. 3, 1997, effective May 30, 1998. *Original authority: 413.065, RSMo 1983, amended 1993, 1994, 1995.