PROFICIENCY TESTING (PT) PROGRAM UNDER NABL IN THE PRESSURE RANGE 7- 70 MPA USING DIGITAL PRESSURE CALIBRATOR (DPC)
Journal Title: Metrology and Measurement Systems - Year 2005, Vol 12, Issue 3
Abstract
This paper describes the proficiency testing of the seven laboratories, accredited by National Accreditation Board for Testing and Calibration of Laboratories (NABL), India using a Digital Pressure Calibrator (DPC) [Model No. - H540/101, Sl. No.- MC808, make-DH-Budenberg, U.K.] as an artifact in the pressure range 70 bar to 700 bar (7 MPa to 70 MPa). The primary objective for organizing this proficiency testing (PT) is to assess the laboratory's technical competence to perform measurements and also fulfilling the requirement of ILAC/APLAC in regards to the compatibility of results submitted by these laboratories. National Physical Laboratory (NPLI), New Delhi, India has the responsibility of coordinating this programme and also acted as a reference laboratory. The stability of the artifact was assessed by measurements made at NPLI before and after the circulation of the artifact. The comparison was carried out at 11 arbitrarily chosen pressure points i.e. 0.7 MPa, 14 MPa, 21 MPa, 28 MPa, 35 MPa, 42 MPa, 49 MPa, 56 MPa, 63 MPa and 70 MPa throughout the entire pressure range. Six measurements were performed at each eleven pressure points, three each in increasing and decreasing orders of pressures, respectively. Laboratories were advised to report the values of various parameters related to the artifact including the temperatures at which the measurements were made. As it was a digital gauge, all participating laboratories were requested to perform the measurement at a temperature sufficiently close to 23°C so that the standard uncertainty of the various coefficient of the artifact do not contribute to the overall measurement uncertainty. Data are analyzed as per ISO/IEC GUM document. The normalized error (En) values are estimated in the entire pressure range. These results are quite encouraging for the manufacturers and calibration laboratories that are facing a new environment after the WTO agreement.
Authors and Affiliations
SANJAY YADAV, A. BANDYOPADHYAY
Keywords
Related Articles
- EP ID EP123843
- DOI -
- Views 61
- Downloads 0
QUALITY ASSESSMENT OF HIGH VOLTAGE VARISTORS BY THIRD HARMONIC INDEX
High voltage varistors that consist mainly of grained ZnO have to be tested before assembling into a surge arrester. The existing methods demand a usage of high voltages and intensive currents that is inconvenient, destr...
PERFORMANCE OF A NEW SET OF IN, SN AND ZN TEMPERATURE FIXED-POINTS
A comparison of a new set of "In, Sn and Zn" temperature fixed-points on the International Temperature Scale of 1990 (ITS-90) was carried out at the National Institute of Standards (NIS - Egypt). The new set was manufact...
A NEW TRANSDUCER OF DOUBLE PROCESSING FOR CAPACITIVE TOMOGRAPHY
The paper presents a new solution of a system for the measurement of small capacities, applied in capacitive tomography. Some known versions of transducers have been discussed. Next, the author has presented his own solu...
STABILIZED TEMPERATURE MEASUREMENTS BASED ON THERMOOPTIC MEMORY PHENOMENA
Investigations of non-linear phenomena in A2MX4 (where: A - organic cation or ion of alkaline metal, M - metal, X - halogen) crystals with incommensurate phases are very interesting both from scientific and practical poi...
USING AN OPTICAL FIBRE SENSOR TO MEASURE DISPLACEMENT OF ELECTRODYNAMICALLY FORMED SHEET METAL
The paper discusses the use of reflective fibre-optic sensor for the purposes of measuring motion parameters of sheet metal formed at high speed, subject to percussive Lorentz forces extorted in a pulsed magnetic field....