Parameters for water often used i physical calibration and testing
References:
Density/thermal expansion: Bettin, Horst & Speiweck, Frank: Die Dichte des Wassers as Funktion der Temperatur nach Einführung der Internationalen Temperaturskala von 1990. PTB-Mitteilungen 3/90.
Vapour pressure: Clausius-Clapeyron equation: More sources e.g. Wikipedia.
Vapour pressure: Antoine equation: Antoine, L. C. 1888. using the constants A = 5.07131, B = 1730.63 og C = 233.426.
Minimum value = 0 oC. Maximum value = 50 oC. Division = 0.01 oC. Default value = 20 oC. Choose (or type value using decimal point - not comma).
Specific volume according to EN1434-1:1997
Temperatures typical for the calibration of energy meters.
Link to article
Date 20161010
ISO17025 8.5 Actions to addres risks and opportunities
In DS/EN ISO/IEC 17025:2017 the risk based thinking we know from many HLS management standards is more clear. This is not new and it was already present in 17025:2005, only not so clearly. The article can be read together with the article on Risk assessment fond in Resources- >product compliance.
Link to article
Get procedure proposal
Date 20191121
Subsequent control of vapour recovery stage II systems
Regulations on vapour recovery stage II system has changed a couple of times since the introduction in 1997. The present regulations require the use of the harmonised standard EN 16321-2 for "new retail sites". At the same time the se of accredited inspection is fased out.
Here you can see an overview of the different inspections/tests.
Link to overview
Date 20161010/20210322
Beregning af |En|
En måde at kontrollere den estimerede usikkerhed ved prøvning og kalibrering er at sammenligne sig med andre. Dette er et krav for alle akkrediterede laboratorier. Her kan der indtastes data fra en sammenligning eller en præstationsprøvning, hvorefter |En| beregnes og der kan udskrives en rapport som pdf-fil.
Data lagres i en midlertidig fil undervejs og efter beregning og udskrift bliver du bedt om at slette filen.
Begrænsninger: Op til 5 deltagere i sammenligningen eller præstationsprøvningen. Ved korelation imellem deltagernes usikkerheder regnes med fuld korrelation.
Dato 20241007