NIT No. 20 Item No.1

Specifications for E₂ Class certified and NABL approved weights- Class E₂, weights or sets of weights shall always be accompanied by a NABL calibration certificate. In design , pattern and MOC etc it will strictly follow OMIL international recommendations. The weights will be supplied from 1mg to 200 grams (23 weights) 1mg-1,2mg-2,5mg-1,10mg-1,20mg-2,50mg-1,100mg-1,200mg-2,500mg-1,1gm-1,2gm-2,5gm-1,10gm-1 20gm-2, 50gm-1,100gm-1,200gm-2(23 Nos. weights) Minimum accuracy class of weights used with weighing instruments The accuracy classes of weights used with weighing instruments shall be in accordance with the requirements of OIML R 76 “No automatic weighing instruments” Maximum permissible errors on verification and expanded uncertainty Maximum permissible error shall be as per Table: 1 of OIML international recommendations For each weight, the expanded uncertainty U for k= 2 (see Annex B) of the conventional mass shall be less than or equal to one-third of the maximum permissible error given in Table 1, except for class E, weights (no specific requirement relating to U for class E, weights; however, U shall be significantly less than the maximum permissible error). The reference conditions applicable to the adjustment of standard weights are as follows: - standard reference density: 8 000 kg m³ - Ambient air density: 1.2 kg m³ - Equilibrium in air at 20°C, without correction for air buoyancy. For each weight, the conventional mass, mc (determined with an expanded uncertainty according to OIML International Recommendations- 3.2) shall not differ by more than the difference: maximum permissible error minus expanded uncertainty, from the nominal value of the weight, Design and pattern of weight: Weights less than one gram shall be flat polygonal sheets or wires, with appropriate shapes which permit easy handling. The shapes shall be indicative of the nominal value of the weights. Weights of one gram may be flat polygonal sheets or wires. The shape of weights not marked with their nominal value shall conform to the following table: Nominal Vales in (mg) Polygonal Sheets 5-50-500 Pentagon 2-20-200 Square For all reference International recommendations of OMIL will prevails. Those weights may also have a cylindrical or slightly tapered conical body. The height of the body shall be approximately equal to the mean diameter; the height shall be between 3/4 and 5/4 of that diameter. Those weights may also be provided with a lifting knob which has a height between the mean diameter and half-diameter of the body. Material of Constructions: The metal or alloy used for weights shall be practically non-magnetic (magnetic susceptibility not to exceed K = 0.03). The hardness of this material and its resistance to wear shall be similar to or better than that of austenitic stainless steel. Density: The density of MOC shall be as per Table-3 of OIML International Recommendations. Packing: Shall be supplied in wooden/ Plastic box Make:- Radwag, Mettler, LCGC and Hafner

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