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*.
||4 June 2014
|PDF File Size:
|ePub File Size:
||Free* [*Free Regsitration Required]
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 calibration intervals see current VIM: Metrological traceability requires an established calibration hierarchy.
ASTM E – 18 Standard Specification for Laboratory Weights and Precision Mass Standards
Otherwise, aetm to their one-piece design, Class 0 weights will not maintain their measured value within the tolerance class. Two-piece construction means the weight is made of multiple pieces of raw material. For weights which have sealing caps, the cap may be made of aluminum. This unique material possesses low magnetic susceptibility, uniform consistency and high resistance to corrosion.
The asym spacer should be of a similar material as the weight. Negative corrections indicate that the weight embodies less mass than is indicated by the assigned nominal value. The magnetization e6117 a body generates an inhomogeneous magnetic field in space and thus may produce magnetic forces on other materials. Historical Version s – view previous versions of standard. These handcrafted adtm 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.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, ast, the address shown below. The surface requirements shall be met at astmm end of the adjustment process. 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. We need your help! Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: If previous calibration values are not available, the estimation of uncertainty has to be based on experience.
Depending on the class, these weights may or may not be marked with their nominal value.
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.
Class 4 weights can be used for calibration of semi-analytical balances and for student use.
Troemner 7008-00 Alloy 8 Metric Stainless Steel ANSI/ASTM E617 Class 0, 20 kg
This will lead to linear summation of uncertainties: This specification covers laboratory weights and precision mass standards including their principal physical characteristics and metrological requirements.
The nominal value of each weight is etched or stamped on the top surface of the weight and their shape is square. Troemner individual weights are not supplied in cases.
The Sheet Metal Weights come standard with the weight products. 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. From the context it is usually clear in which sense the term is used. Within the interior of the wood case is contained a polypropylene case to hold weights g and below with compartments for each weight.
Troemner Calibration Weights are available in either one-piece or two-piece construction. Minimum requirements for the number of weighing cycles are in Table If asm 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.
Although very stable, one-piece construction Class 0 weights have no method of adjustment and are not suitable for general laboratory use. Last previous edition approved in as Aatm — 97 There are no markings indicating nominal value on any Class 0 weights. They must be specified when weights are to be used as standards for the calibration of weights of Classes00, 0, 1, 2 and 3, and where maximum stability is required.
For Classes 5, 6 and 7 the total surface areas should be minimized to the extent possible. This may be interpreted as an eccentric loading error and the corresponding uncertainty should be estimated using Eq Markings shall not perforate or awtm sheet metal weights.
Please copy and paste this embed script to where you want to embed Embed Script. This is an upper limit for the uncertainty.
Please fill this form, we will try to respond as soon as possible. In any case the unit shall not be included axtm such marking would be illegible. In cases when the interchange is performed during a calibration procedure, the average of the two indication differences shall be taken as the weighing result and uE can be neglected.
Metrological and Technical Requirements 2. Troemner supplies appropriate lifting devices such as forceps, gloves, and other lifting forks sufficient to handle every weight in the set.
A precise measurement of density can only be made for one-piece weights. 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. 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.
Vertical component of the magnetic interaction between the weight and the balance or the environment, or both. Only the numerical portion of the weight value needs to be on the surface of weights.
ASTM E – 97() Standard Specification for Laboratory Weights And Precision Mass Standards
The body of the weight is one piece and the knob of the weight is the second piece. 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.
Construction and General Shape 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. Class 2 weights can be used to calibrate weighing instruments for important commercial transactions asstm gold and precious stones.