HFM-D-301, 303, 305, 307 - Teledyne Hastings Instruments - #1

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www.teledyne-hi.com TELEDYNE HASTINGS INSTRUMENTS MODELS HFM--D--301 & 305 HFC--D--303 & 307 FEATURES • Flows from 0-25 slm (N2 Equivalent) up to 0-2500 slm (N2 Equivalent) • Accuracy in Nitrogen • (0.2% of Full scale + 0.5% of Reading) • Flexible Operation with ±12, ±15 or 24 VDC • RS232/485 • Auto-Zero (Flow Controllers Only) • Self-Diagnostics –Sensor, Valve and Overflow • Analog or Digital Control and Indication • Store Up to 10 Gas Calibrations • Provides Totalized Flow • Process Control Alarms APPLIICATIIONS • Heat Treat • Fuel Cell Testing • Pharmaceutical Production • Secondary Calibration Reference • Gas Generators • Research BENEFIITS • Enhanced Accuracy • Superior Linearity • Digital Communications Digital 300 Series - Med/High Capacity DESCRIIPTIION The Teledyne Hastings Instruments Digital 300 Series thermal mass flow meter/controller provides accurate, flexible, and reliable gas flow metering and/or control. The heart of the instrument is a patented thermal transfer sensor and laminar flow shunt assembly that are also used in the analog 300 series flow instrumentation. Each of these parts were designed by examining the physics behind the nonlinearities in the common thermal sensor and flow shunt design and altering the operation and construction to remove the primary sources of error. The major source of non-linearities for a laminar flow element are the pressure drops generated by a fluid entering or exiting a flow channel within the flow element. The 300 series laminar flow element is designed such that the pressure drops that are measured occur in an annular region around the flow shunt after the entrance effects and before the exit effects. This design greatly 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. HFM-D-301