HFM-305/HFC-307
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Catalog excerpts

TELEDYNE HASTINGS INSTRUMENTS DESIGN FEATURES Teledyne Hastings Instruments (THI) products represent over 55 years of experience in the design and manufacture of mass flow products. The 300 Series is a culmination of this experience with patented technologies that make these the finest flowmeters and controllers available today. The THI Mass Flow 300 Series products are designed to accurately measure mass flow without corrections or compensations for gas pressure and temperature. They are accurate to better than ±1.0% of full scale. THI mass flow instruments do not require any periodic maintenance under normal operating conditions with clean gases. No damage will occur from the use of moderate overpressures (~500 psi) or overflows. Instruments are normally calibrated with the appropriate standard calibration gas (air), then a gas conversion factor (GCF) is used to adjust the output for the intended gas. Special calibrations for other gases, such as oxygen, helium and argon, are available upon special order. 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 linear 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 removable/ replaceable sensor module. (4) The unit has very fast settling times. Models HFM-305, HFC-307 FEATURES • Range — 1000-2500 slm (Air Equivalent); Higher Flows Available • ±1.0% of Full-Scale Accuracy1 • Rapid Settling Times: HFM-305 0.4 seconds HFC-307 2.0 seconds • Operating Pressures to 500 PSI • NIST Traceable Calibration APPLICATIONS • Gas Blending • Research • R&D and Process Flows • Pollution Monitoring HFM-305 HIGH CAPACITY FLOWMETERS AND CONTROLLERS HFC-307

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MODELS HFM-305/HFC-307 COMMON SPECIFICATIONS HFM-305/HFC-307 Accuracy1 ± 1.0% of F.S. Repeatability ± 0.07% of F.S. Maximum Operating Pressure 500 psi Pressure Coefficient 0.015%/psi (N2) (0-500 psig) Leak Integrity < 1x10-9 sccs He Temperature Coefficient (zero) < 0.079%/°C of F.S. (0-60°C) Temperature Coefficient (span) < 0.092%/°C of reading (15-50°C) Standard Output 0-5 VDC Optional Output 4-20 mA Connector 15-pin subminiature D Attitude Sensitivity of Zero < 0.2% of F.S. (N2 @ 19.7 psia) Attitude Sensitivity of Span < 0.06% of reading (N2 @ 19.7 psia) SPECIFICATIONS HFM-305 Settling...

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Model HFM-305 MODELS HFM-305/HFC-307 All dimensions shown are in inches [mm]. Model HFC-307

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Your Customer Service Representative Telephone: (757) 723-6531 Toll Free: (800) 950-2468 Fax: (757) 723-3925 World Wide Web: http://www.teledyne-hi.com E-mail: hastings_instruments@teledyne.com P.O. Box 1436 Hampton, VA 23661 MODELS HFM-305/HFC-307 PB 152-10/05 © Teledyne 2005 All Rights Reserved. Typical instrument ordering/options number: Model No. Circuit Output Fittings Seals Pressure Calibration Board Type HFM-305 01 01 02 01 01 01 Order No. Options Circuit Board 01 Pinout H (Standard) 02 Pinout U 03 Pinout M Output 01 0-5 Volts (Standard) 02 4-20mA Order No. Options Fittings 01 1”...

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