ASTM E Tolerances have been converted from avoirdupois to metric and rounded to two significant figures. Nominal Size. Class 0. Class 1. Class 2. services. The weight portfolio covers both OIML and ASTM weights from ASTM weights are available in classes 1 – 6 matching requirements of ASTM E International Organization of. Legal Metrology Recommendation R Troemner UltraClass Series. ANSI/ASTM E NIST Handbooks**. Weight. Class. E0*.
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These weights are designed for your most demanding weighing applications. This unique material possesses low magnetic susceptibility, uniform consistency and high resistance to corrosion. One may be tempted to purchase the weights with the tightest tolerances in order to reduce measurement uncertainty. In the case of sets of non-metric weights, at least the largest weight of a particular set should be marked with the unit name or abbreviation.
The standard deviation can also be calculated as described in 9.
ASTM E – Free Download PDF
Troemner weight sets where the largest weight is g and lower are supplied in attractive, durable polypropylene cases with a compartment for each weight within the case. Adjusting material and back-up disc must meet the magnetic requirements specified for the accuracy class of the weight.
Weights mg and below are made of sheet metal and are one-piece construction with one side turned up to make them easy to handle with forceps. Thank you for interesting aatm our services. In any case the unit shall not be included where such marking would be illegible.
We are a asrm group that run this website to share documents. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Troemner Calibration Weights 1 g and larger consist of a body and a lifting knob. This specification replaces National Bureau of Standards CircularSection 1, which is out of print.
Work Item s – proposed revisions of this standard. We ast your help! Ordering Information 4 and 5 6 and 7 80 Not applicable 6. There is a cavity below the knob thread in the body which contains adjusting material, typically the same material from which the weight is made.
They can also be used to calibrate Class 3 weights. A number in parentheses indicates the year of last reapproval. The back-up spacer should be of a similar material as the weight. This uncertainty contribution is applicable, if it is known from previous interchanging measurements with weights of the same nominal value. Troemner weight sets, where the largest weight is g and larger are supplied in handcrafted wood adtm.
There are also compartments for lifters and forceps supplied with each weight set. National prototype standard—platinum-iridium kilogram identified as K20, maintained at the National Institute of Standards and Technology, with value assigned relative to the International Prototype Kilogram provides the United States access to the mass unit.
The surface of the weights may be treated with a suitable coating in order to improve their corrosion resistance. The unit of mass is the kilogram. Permission rights to photocopy the standard may also be secured from the ASTM asym www. Weights made of wire or too small to be marked shall not be marked but should be identifiable by their shape or number of bends. Class 0 weights 1 g and larger are of one-piece construction using Troemner Alloy 8 Stainless Steel, which has a consistent density.
Negative corrections indicate that the weight embodies less mass than is indicated by the assigned nominal value. For reference standards, stability and information about the values of the weights is more important than the closeness of the values to nominal.
At sea level the density of air may be assumed to be 1. Markings shall not perforate or crack sheet metal weights. NOTE 2—Maximum Permissible Errors for weights of denomination intermediate between those listed, the maximum permissible error shall be proportional to the values shown.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
Abbreviations are shown asm Appendix X2. Only the numerical portion of the weight value needs to be on the surface of weights. NOTE 4—Materials used to make weights for special applications that do not fall within the density limits stated above, should have stated densities or density determinations performed. The mass of the weight is the assigned nominal value plus the assigned correction.
One-piece weights are difficult to manufacture as the only method of final adjustment is removing material by polishing. Sheet metal weights or wire weights may be used below 1 g. Two-piece construction means the weight is made of multiple pieces of raw material. This specification covers laboratory weights and precision mass standards including their principal physical characteristics and metrological requirements. The cases are designed so that each weight will stay in its compartment.
The weights are manufactured of the finest stainless steels available including Troemner Alloy 8 Stainless Steel, which was developed by Troemner and is available exclusively s617 Troemner. This unique material possesses low magnetic susceptibility and It is the finest grade of stainless steel available. For Class and 00 the manufacturer shall provide a measured value for the density of the weights. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.
The lifting knob is specifically designed for use with asmt, tweezers or some other lifting w617. They should be used in extremely stable asstm and handled with the highest level of care.