Fluke Precison Measurement - Fluke Calibration Instruments - Hart Scientific - #19

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DHI supports gas ±ow calibration needs from the primary standard laboratory at the apex of the measurement system to secondary laboratories and production calibration and testing. The molbloc/molbox™ mass ±ow calibration system is based on patented laminar and sonic nozzle ±ow element designs that apply today’s modern sensor, mathematical modeling, data processing and manufacturing techniques to reach new levels of precision and stability over time. Following its introduction, molbloc/ molbox was rapidly and widely adopted by organizations requiring reliable low gas ±ow measurements, particularly mass ±ow controller (MFC) manufacturers and users. Today, hundreds of molbloc/molbox systems are in use throughout the world, and molbloc/molbox is truly considered an industry standard for low gas ±ow calibration. .. molbloc/molbox transfer standard covers the ±ow range from less than 1 sccm to more than 5000 slm with measurement uncertainty of ± 0.2 % of reading in a compact, easy-to-use, bench top system. .. molbloc/molbox and its accessories are designed to optimize the setup of a complete, automated gas ±ow calibration system. The system performs a wide variety of ±ow calibration functions with the greatest convenience and the highest level of automation possible. .. The GFS dynamic gravimetric mass ±ow calibration system is the only commercially available primary ±ow standard based on the direct measurement of the fundamental units of mass and time. molbloc-S 10 to 100 % Only % molbloc Full Scale Measurement Uncertainty molbloc-L Only molbox1 10 -0.050 % FS -0.020 % FS -0.005 % FS 0.005 % FS 0.020 % FS 0.050 % FS 01 100 molbox RFM RFM Microrange 0.5 % of Reading 0.5 % of Reading 0.2 % of Reading 0.2 % of Reading molbloc® flow measurement uncertainty 19 Gas flow calibration Tech tip Accurate gas flow calibrations require attention to detail. .. For standard or normal ±ow units (e.g.; slm, nccm), assure you are using the same reference pressure and temperature for the ±ow standard and device under test. .. Are you calibrating the device under test under its correct operating conditions, or making proper corrections if not? .. Flow standards and instrumentation can be susceptible to contamination. Are you using a clean, dry gas source and appropriate filtration? .. Reduce stabilization time for low ±ow calibrations by minimizing the gas volume between the ±ow reference and device under test. Visit DH Instruments on the web at www.fluke.com/fpmcat for details about pressure and ±ow 19 calibration products and services, articles and tips, papers and presentations, and much more.