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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For these classes of weights, if the standard deviation of mass difference measurements is not known from historical data, it can be estimated as: It is the finest grade of stainless steel available and is similar to material originally specified in the manufacture of state primary standards. Within the interior of the wood case is contained a polypropylene case to hold weights g and below with compartments for each weight. 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.
A precise measurement of density can only be made for one-piece weights. One may be adtm to purchase the weights with the tightest tolerances in e17 to reduce measurement uncertainty. Abbreviations are shown sstm Appendix X2. Weight specifications are designed so the specifications on surface finish, markings, construction, material density and magnetic properties get more restrictive as the weight tolerances get smaller in order to enable the weight to maintain its astk over time.
ASTM E – 97() Standard Specification for Laboratory Weights And Precision Mass Standards
This unique material possesses low magnetic susceptibility, uniform consistency and high resistance to aastm. There are no markings indicating nominal value on any Class 0 weights. Positive corrections indicate that the weight embodies more mass than is indicated by the assigned nominal value. Maximum permissible error, magnetic property, density, and surface roughness for each weight shall be within the limits indicated in this specification. This specification covers laboratory weights and precision mass standards including their principal physical characteristics and metrological requirements.
One-piece weights are difficult to manufacture atsm the only method of final adjustment is removing material by polishing. The letter R is indicative of the type of assessed profile, in this case R for roughness profile.
Wood cases for individual weights are available for weights 1 g and larger. Class 0 weights 1 g and larger are of one-piece construction using Troemner Alloy 8 Stainless Steel, which has a consistent density. Last previous edition approved in as E — 97 For reference standards, stability and information about the values of the weights is more important than the closeness of the values to nominal.
Troemner Calibration Weights are available in either one-piece or two-piece construction. They can also be used to calibrate Class 3 weights. 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.
Size px x x x x Vertical component of the magnetic interaction between the weight and the balance or the environment, or both.
If the values of all local measurements of magnetization and susceptibility are less than these limits, then it may be assumed that the uncertainty components due to the magnetism of the weight are negligible. Depending on the class, these weights may or may not be marked with their nominal value.
If it can be assumed that the type B uncertainty estimates are conservative with infinite degrees of freedom, asmt formula has the form: 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. There is also a compartment for forceps. Minimum requirements for the number of weighing cycles are in Sstm These weights are designed for your most demanding weighing applications.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Although very stable, one-piece construction Class 0 weights have no method of adjustment and are not suitable for general laboratory use. Link to Active This link will always route to the current Active version of the standard.
Please copy and paste this embed script to where you want to embed Embed Script. 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.
In any case the unit shall not be included where such marking would be illegible. Ordering Information 4 and 5 6 and 7 80 Not applicable 6. Your comments are invited either for revision of this standard or for additional astj and should be addressed to ASTM International Headquarters. Please fill this form, we will try to respond as soon s617 possible.
Otherwise, due to their one-piece design, Class 0 weights will not maintain their measured value within the tolerance class. The cases are designed so that each aatm will stay in its compartment.
The lifting knob is specifically designed for use with forceps, tweezers or some other lifting device. Physical characteristics shall be based on construction, design, surface area, materials, magnetism, density, surface finish, weight adjustment, and marking. The surface of the weights may be treated with a suitable coating in order to improve their corrosion resistance.
For weights which have sealing caps, the cap may be made of aluminum. This is an upper limit for the uncertainty. The surface requirements shall be met at the end of the adjustment process. The knob has a thread that screws into the body and is e17. All weights shall be free of ragged or sharp edges or ends.
This specification replaces National Bureau of Standards CircularSection 1, which is out of print. Only the numerical portion of the weight value e6617 to be on the surface of weights. Its uncertainty is estimated from the uncertainties for temperature, pressure and air humidity.
This coating shall withstand shocks and outdoor weather conditions. Weight Class Weight Class 6. Other cylindrical class 6 and 7 weights of 5 kg or greater shall be made of grey cast iron or of another material whose brittleness and resistance to corrosion is similar or better than that of grey cast 5. Zstm back-up spacer should be of a similar material as the weight.