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Manual: 152-082010 301-305-306_303-307 Series Page 4 of 35
1. General Information
The Hastings 300 Series high range mass flow meters are designed to accurately measure mass flow at a
range between 25 slm and 10000 slm. The Hastings 300 Series high range mass flow controllers are
designed to accurately measure and control mass flow at a range between 25 slm and 2500 slm. These
instruments are intrinsically linear and have an accuracy of better than ±1% F.S. (full scale).
Hastings 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/3.45MPa) or overflows. Instruments are normally calibrated with the appropriate standard calibration
gas (nitrogen) then a correction factor is used to adjust the output for the intended gas. Calibrations for
other gases, such as oxygen, helium and argon, are available upon special order.
1.1. Features
• LINEAR BY DESIGN. The HFM-301/305/306 and HFC-303/307 series is intrinsically linear (no
linearization circuitry is employed). Should recalibration (a calibration standard is required) in the
field be desired, the customer needs to simply set the zero and span points. There will be no
appreciable linearity change of the instrument when the flowing gas is changed.
• NO FOLD OVER. The output signal is linear for very large over flows and is monotonically increasing
thereafter. The output signal will not come back on scale when flows an order of magnitude over
the full scale flow rate are measured. This means no false acceptable readings during leak testing.
• MODULAR SENSOR. The HFM-301/305/306 and HFC-303/307 series incorporates a
removable/replaceable sensor module. Field repairs to units can be achieved with a minimum of
production line downtime. Calibration is required.
• FAST SETTLING TIME. Changes in flow rate are detected in less than 500 milli-seconds when using
the standard factory PC board settings. Controller response is typically < 2 seconds.
• LOW TEMPERATURE DRIFT. The temperature coefficient of span for the HFM-301/HFC-303 series is
less than 0.092% of full scale/°C from 0-60°C. The temperature coefficient of zero is less than 0.085
% of reading/°C from 0-60°C.
• FIELD RANGEABLE. The HFM-305 and HFC-307 are available in ranges from 1000 slm to 2500 slm.
The HFM-301 and HFC-303 are available from 25-1000 slm. Each flow meter has a shunt and
transducer which can be exchanged in the field to select different ranges. Calibration, however, is
required.
• CURRENT LOOP. The 4-20 mA option gives the user the advantages of a current loop output to
minimize environmental noise pickup.