HFM-306 - Teledyne Hastings Instruments - #1

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www.teledyne-hi.com HFM--306 ((Fllow meter)) • Available flow ranges: 0-2500 slm to 0-8000 slm (N2) FEATURES • Rapid Settling Times • Operating Pressure to 300 PSI • NIST Traceable Calibration APPLIICATIIONS • Delivery Systems • R&D and Process Flows • Petrochemical • Fuel Cell TELEDYNE HASTINGS INSTRUMENTS The 300 Series products contain a number of features that set them apart from other, available instruments: 1. They are inherently linear; no linearization circuitry is employed. Should recalibration in the field be desired (a calibration standard is required), the customer needs to simply set the zero and span points. 2. The output signal is usable for very large overflows and will not come back on scale when a flow an order of magnitude over the full scale flow rate is measured. 3. The instrument incorporates a replaceable sensor module. 4. The unit has very fast settling times. For a full explanation, please see the 300 Series white paper on www.teledyne-hi.com When viewing the electronic version of this Product Bulletin, use this link: http://www.teledyne-hi.com/tech-papers/Flow-Reading.pdf The heart of the instrument is a high speed thermal transfer sensor and a linear laminar flow shunt assembly. The sensor has been optimized to minimize the thermal transfer time in order to speed up the flow response. HFM-306, High Capacity Meter DESCRIPTION Teledyne Hastings Instruments (THI) products represent over 60 years of experience in the design and manufacture of flow instrumentation. The 300 Series is a culmination of this experience with patented technologies that make these the finest flow meters and controllers available today. The THI Mass Flow 300 Series meters and controllers are designed to accurately measure mass flow without corrections or compensations for gas pressure and temperature. The HFM-306 version is accurate to better than ±3.0% of full scale. THI mass flow instruments do not require any periodic maintenance under normal operating conditions with clean gas. In the HFM-306, this pressure drop is measured in an annular region around the laminar flow shunt after the entrance effects and before the exit effect occur. This vastly improves the linearity of the flow divider and minimizes the large changes in linearity that typically occur when the specific gravity of the flowing medium changes. The HFM-306 includes a flow straightening section which helps establish well defined flow for higher accuracy. Instruments are normally calibrated with the appropriate standard calibration gas (air), then a correction factor is used.