ASTM E617 PDF
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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Troemner individual weights are not supplied in cases.
Troemner Calibration Weights are available in either one-piece or two-piece construction. If previous calibration values are not ast, the estimation of uncertainty has to be based on experience. 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. 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.
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. The surface of the awtm may be treated with a suitable coating in order to improve their corrosion resistance.
From the context it is usually clear in which sense 6e17 term is used. The shape of weights smaller than 1 mg shall be discussed and verified with the customer.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
The cases are designed so that each weight will stay in its compartment. Metrological traceability requires an established calibration hierarchy. The Sheet Metal Weights come standard with the weight products. Two-piece construction means the weight is made of multiple pieces of raw material. This unique material possesses low magnetic susceptibility, uniform consistency and high resistance to corrosion.
These handcrafted cases feature a fine wood exterior with an interior compartment that is either fully lined with padded velvet or velour for the given weight or the case has a foam interior. For Classes 5, 6 and 7 the total surface areas should be minimized to the extent possible.
ASTM E – 97() Standard Specification for Laboratory Weights And Precision Mass Standards
This abstract is a brief summary awtm the referenced standard. Markings shall not perforate or crack sheet metal weights. Maximum permissible error, magnetic property, density, and surface roughness for each weight shall be within the limits indicated in this specification. NOTE 2—Maximum Permissible Errors for weights of denomination intermediate between those listed, the maximum permissible error shall be proportional to the values shown.
This specification replaces National D617 of Standards CircularSection 1, which is out of print. 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.
Nominal value of weights mg and below are determined by their shape as listed in the table below: Physical characteristics shall be based on construction, design, surface area, materials, magnetism, density, surface finish, weight adjustment, and marking.
For reference standards, stability and information about the values of the weights is more important than the closeness of the values to nominal. The body of the weight is one piece and the knob of the weight is the second piece. If magnetic effects are negligible, i.
However, frequency of use, care, handling and environmental conditions all play a major role in the long term stability of weights and these factors should be considered before purchasing Class 0 weights.
ASTM E – Free Download PDF
This uncertainty contribution is applicable, if it is known from previous interchanging measurements with weights of the same nominal value. Depending on the class, these weights may or may not be marked with their nominal value.
Weight bottoms are slightly ast, to expose the smallest possible area to wear.
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. There are also compartments for lifters and forceps supplied with each weight set.
Link to Active This link will always route to the current Active version of the standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. Please fill this form, we will try to respond as soon as possible. In any case the unit shall not be included where such marking would be illegible.
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.