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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Elements for confirming metrological traceability to be an unbroken chain to an international measurement standard or a national measurement standard IPK or NPSshall include a documented measurement uncertainty, a documented measurement procedure, accredited technical competence, metrological traceability to the SI, and established ast intervals see current VIM: Class 0 weights mg and lower are made of sheet metal and are one-piece construction with one side turned up to make them easy to handle with forceps.
For weights of higher precision, the range of density is limited atm values at or near the density of well-established standards, such as are used by primary calibration laboratories.
For weights which have sealing caps, the cap may be wstm of aluminum. This unique material possesses low magnetic susceptibility, uniform consistency and high resistance to corrosion. Troemner individual weights are not supplied in cases.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
This will lead to linear summation of uncertainties: 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. Adjusting material can be used as long as it is of a material at least as stable as the base material and is contained in such a way that it will not become separated from the weight. Class 2 weights can be used to calibrate weighing instruments for important commercial transactions like gold and precious stones.
This specification replaces National Bureau of Standards CircularSection 1, which is awtm of print. Abbreviations are shown in Appendix X2.
One may be tempted to purchase e61 weights with the tightest tolerances in order to reduce measurement uncertainty. Weight specifications are designed so the specifications on surface e61, markings, construction, material density and magnetic properties get more restrictive as the weight e6117 get smaller in order to enable the weight to maintain its tolerance over time.
Originally approved in 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. United States Download From http: The surface requirements shall be met at the end of the adjustment process.
Cast iron cannot have a susceptibility specification of any real value. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Permission rights to photocopy the standard may also be secured from the ASTM website www.
Work Item s – proposed revisions of this standard. Sheet metal weights or wire weights may be used below 1 g.
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. However, frequency of use, care, handling and environmental conditions all play a qstm role in the long term stability of weights and these factors should be considered before purchasing Class 0 weights.
The unit of mass is the kilogram. E6177 lower precision of measurement is required, so the range of density is broadened. Nominal value of weights mg and below are determined by their shape as listed in the table below: Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
This unique material possesses low magnetic susceptibility and It is the finest grade of stainless steel available. There is also a compartment for forceps.
Weight Class Weight Class 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.
ASTM E – Free Download PDF
This coating shall withstand shocks and outdoor weather conditions. From the context it is usually clear in which sense the term is used.
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 through Troemner.
awtm These maximum permissible errors apply to conventional mass values. The lifting knob is specifically designed for use with forceps, tweezers or some other lifting device. These weights are constructed with one end turned up to allow for easy handling with forceps. All weights shall be free of ragged or sharp edges or ends.
Class 4 weights can be used for calibration of semi-analytical balances and for student use. For Class and 00 the manufacturer shall provide a measured value for the density of the weights.