![]() ![]() 'Uncertainty and Confidence in Measurement' Document M3003 published by the UK Accreditation Service (UKAS) sets out procedures for accredited laboratories for estimating uncertainty during calibration. Several standards exist that define procedures for measuring and expressing uncertainty. How was the uncertainty value calculated ? Any deviations from this value are then used to calculate the uncertainty value. These devices provide a known value against which to compare measurement performance and can include methods such as a weigh tank, volume tank or meter prover. In reality, testing houses tend to base their calibration uncertainty figures on the uncertainty of their reference device. Sources of uncertainty can include variations in testing times, valve response, the effects of obstacles in the line or variations in the properties of the fluid being measured. To be sure that your flowmeter has been calibrated as accurately as possible, you should be sure to ask calibration and repair establishments the following questions: Does the flow meter calibration figure include flow rig uncertainty ?įlow rig uncertainty takes into account all factors that could affect the meter's flow measurement accuracy during calibration. The water can also be heated to 40 deg C if required to increase the Reynolds Number. ![]() The 18m calibration rig is available to test and certify electromagnetic, vortex, variable area, swirl and DP (differential pressure) instruments ranging from 50 to 600m, flow rates from 2.5 to 440l/sec and differential pressures from 50 to 2500mbar. Utilising EON's UKAS accredited 28-tonne gyroscopic weigh tank and bridge, RS Hydro can calibrate flow meters to an accuracy of +/-0.1%. We offer a service that is unparalleled in the UK, for cost, quality and efficiency.įor users of industrial flowmeters who need to keep their instruments running at optimum performance levels, RS Hydro has the capability to offer a comprehensive calibration and repair service. RS Hydro provide a total solution service to end users of all meters: removal, recalibration and re-installation. Calibrated reference meters can be utilised to establish the accuracy of the primary element to within +/-2%*. This can establish and eliminate errors between the meter, it's transmitter and signal loops. Many meters can be verified utilising specialist simulators. Where it is not possible to remove the meter from the field, it is possible to undertake liquid flow meter calibrationor verify the device in-situ. ![]()
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